Worldwide, prostate cancer is the most commonly diagnosed malignancy and the sixth leading cause of cancer death in men. In 2012, this amounted to 1,100,000 newly diagnosed cases and 307,000 deaths around the world from this disease.
Fortunately, the majority of prostate cancers tend to grow slowly and are low-grade with relatively low risk and limited aggressiveness.
There are no initial or early symptoms in most cases, but late symptoms may include fatigue due to anemia, bone pain and paralysis from spinal metastases, and renal failure from bilateral ureteral obstruction.
Diagnosis is primarily based on prostate-specific antigen (PSA) testing, and transrectal ultrasound-guided (TRUS) prostate tissue biopsies, although PSA testing for screening remains controversial.
Newer diagnostic modalities include free and total PSA levels, PCA3 urine testing, Prostate Health Index scoring (PHI), the"4K" test, genomic analysis, MRI imaging, PIRADS scoring, and MRI-TRUS fusion guided biopsies.
When the cancer is limited to the prostate, it is considered localized and potentially curable.
If the disease has spread to the bones or elsewhere outside the prostate, pain medications, bisphosphonates, rank ligand inhibitors, hormonal treatment, chemotherapy, radiopharmaceuticals, immunotherapy, focused radiation, and other targeted therapies can be used. Outcomes depend on age, associated health problems, tumor histology and the extent of cancer.
The primary known major risk factors are age, ethnicity, obesity, and family history.
The overall incidence increases as people get older; but fortunately, cancer aggressiveness decreases with age.
Prostate cancer risk factors include male gender, older age, positive family history, increased height, obesity, hypertension, lack of exercise, persistently elevated testosterone levels, Agent Orange exposure, and ethnicity.
These inhibitors such as finasteride and dutasteride may decrease low-grade cancer incidence but they do not appear to affect high-grade risk and thus, do not significantly improve survival. These medications will reduce PSA levels by about 50% which must be accounted for when comparing sequential PSA readings.
The cause of prostate cancer is unclear but genetics is certainly involved. Genetic background, ethnicity, and family history are all known to contribute to prostate cancer risk.
Prostate cancer is generally linked to the consumption of the typical Western diet.
Prostate cancer is linked to some medications, medical procedures, and medical conditions.
Multiple lifetime sexual partners or starting sexual activity early increases the risk of prostate cancer. Frequent ejaculation may decrease prostate cancer risk, but reduced ejaculatory frequency is not associated with any increased risk of advanced prostate cancer.
Infections may be associated with the incidence and development of prostate cancer.
Vasectomy and Prostate Cancer
There was once thought to be an association between vasectomy and prostate cancer; but larger, follow-up studies have failed to confirm any such relationship.
Prostate cancer is the most commonly diagnosed organ cancer in men and the second leading cause of male cancer death in the United States. (Lung cancer is first.)
Relatively few patients with prostate cancer die of the disease although this still amounts to over 26,000 deaths per year in the United States.
In Sweden, where they do very few PSA tests and tend to be less aggressive in treating prostate cancer, the death rate for men with this malignancy is about 2.5 times the mortality rate in the United States; making it the number one cause of cancer mortality in Swedish men, even exceeding lung cancer.
Prostate cancer incidence is higher in developed countries and is least common in Asian men living in Asia. When Asians come to live in the United States, their incidence of prostate cancer increases but it remains lower than the overall risk for the general population of American men.
More than 80% of men will develop prostate cancer by age 80. However, in this age group, it will probably be slow growing, lower grade, relatively harmless and have little impact on their survival.
In 2015, there were an estimated 3 million prostate cancer survivors in the United States. This is expected to increase to 4 million by 2025.
According to the National Cancer Institute (NCI), every American man has a lifetime risk of 11.6% of developing clinically significant prostate cancer (Gleason 3 + 4 = 7 or higher).
For 2018, The NCI is expecting 164,690 new cases of prostate cancer and 29,430 deaths in the United States which is an increase from 2017.
Effect of 2012 United States Preventive Services Task Force (USPSTF) Negative Recommendation on Routine PSA Screening
Since the USPSTF recommendation against routine PSA screenings in 2012, there have been a number of consistent changes in the clinical and pathological characteristics of prostate cancer as reported in August, 2018. These findings include the following:
These findings are not unexpected given the reduced number of PSA screenings and the adoption of active surveillance regimens for lower risk cancers.
Mortality statistics for prostate cancer are very ethnic dependent with blacks in America having the highest incidence and mortality rates, far exceeding the levels for the general population.
Prostate cancer mortality rates calculated as deaths/100,000 population from the National Cancer Institute (NCI) and the Surveillance, Epidemiology, and End Results (SEER) databases are as follows:
The prostate is roughly 3 centimeters long, about the size of a walnut, and weighs approximately 20 grams. Its function is to produce about a third of the total seminal fluid.
The prostate gland is located in the male pelvis at the base of the penis. It is below (inferior) to the urinary bladder and immediately anterior to the rectum.
The prostate surrounds the posterior part of the urethra, but this can be misleading. The posterior urethra, prostatic urethra, and proximal urethra all describe the same anatomy as there is no difference between the internal lining of the prostate and the urethra; they are the same entity.
The prostate is primarily made up of glandular tissue which produces fluid that constitutes about 30 to 35% of the semen. This prostatic portion of the semen nourishes the sperm and provides alkalinity which helps maintain a high pH. (The seminal vesicles produce the rest of the seminal fluid.)
The prostate gland requires androgen (testosterone) to function optimally. This is why hormonal therapy (testosterone deprivation) is so effective. Castrate resistant tumors are thought to generate intracellular androgens.
Cancer begins with a mutation in normal prostate glandular cells, usually beginning with the peripheral basal cells.
Prostate cancer is most common in the peripheral zone which is primarily that portion of the prostate that can be palpated via digital rectal examination (DRE).
The prostate accumulates zinc and produces citrate. However, increased dietary or supplemental zinc and citrate do not appear to have any influence on prostatic health or the development of prostate cancer.
The Gleason Scoring System
The Gleason prostate cancer score has been shown, over time, to be the most reliable and predictive histological grading system available. Originally developed by pathologist Dr. Donald Gleason in the 1960s, it has stood the test of time and has been universally adopted for all prostate cancer pathological descriptions.
The Gleason scoring system is based on the microscopic arrangement, architecture or pattern of the glands in the prostate rather than on the individual cellular characteristics that define most other cancers. The pattern is given a grade from 1 to 5 with 1 representing an almost normal microscopic glandular pattern and appearance, to 5 where no glandular architecture remains, and there are only sheets of abnormal cancer cells.
The Gleason score always contains two grades in the form of numbers and then a total score. The predominant Gleason grade pattern is always the first number, 1 to 5, and the second number would be any secondary or minor pattern, also graded 1 to 5. So the absolute best and lowest risk Gleason score would be Gleason 1 + 1 = 2, and the worst high-grade pathology would be Gleason 5 + 5 = 10. In real life, we almost never see these histological extremes.
If only one Gleason grade or pattern is seen, then the Gleason score would consist of the same Gleason grade repeated and added together as in Gleason 3 + 3 = 6; which happens to be the most commonly found Gleason score.
Low-grade tumors would be any Gleason score of 3 + 3 = 6 or less.
Intermediate-grade cancers would be a Gleason score of 3 + 4 = 7. This would mean that most of the tumor was Gleason grade 3, but there was a smaller portion that was the more aggressive Gleason grade 4.
A Gleason score of 4 + 3 = 7 or higher would be considered high-grade cancer.
While architecture or pattern, as described by the Gleason score, is certainly a major component of the histological diagnosis of prostate cancer, it is not the only criteria. For example, prostate specific membrane antigen is a transmembrane carboxypeptidase that exhibits folate hydrolase activity which is overexpressed in prostate cancer tissues. Its presence would suggest prostate cancer.
Other significant microscopic histological features and indicators of prostate cancer would include:
The number of positive biopsies also has prognostic value. In a study of 960 intermediate grade (Gleason 3 + 4 = 7) prostate cancers followed for at least four years, 86% of patients with less than 34% positive biopsies demonstrated a stable PSA compared with only 11% of patients who had more than 50% positive biopsies.
Cancer volume is another important prognostic parameter, but it is difficult to measure accurately with available technology. Prostatic MRI is currently our best instrumentation for estimating tumor volume.
Perineural invasion is somewhat helpful in predicting extracapsular tumor extension and may be associated with slightly higher tumor aggressiveness, but studies are conflicting on its clinical usefulness.
The "New" Gleason Scoring System
In 2016, the World Health Organization (WHO) proposed a new classification system based on clinical experience with the old Gleason scoring system that suggested very little difference in clinical outcomes in lower Gleason score patients, but somewhat different ones in the higher grades. The following is a summary of the "New" Gleason system:
In clinical practice, Group 1 is considered "Low Grade," Group 2 is "Intermediate Grade," and Group 3 or higher is "High Grade" disease.
High-Grade Prostatic Intraepithelial Neoplasia (High-Grade PIN)
The Gleason system is a very good way of grading prostate cancers, but there are situations where the microscopic appearance of prostatic tissue is not malignant even though the individual cells appear very abnormal and dysplastic; similar to how most cancer cells in other tissues would typically appear. In high-grade PIN, cells will usually show very large nucleoli, but marked pleomorphism is not present. The prostatic ducts and glandular patterns appear normal with a normal peripheral basal cell layer. This condition is considered pre-malignant and is called high grade prostatic intraepithelial neoplasia (high-grade PIN). A low-grade PIN is considered benign and is usually not reported.
First described in 1969, only the high-grade PIN lesions are clinically significant as they are closely associated with prostate cancer. For example, 80% to 90% of all radical prostatectomy specimens will demonstrate high-grade PIN on careful examination. These findings make rebiopsy or at least close observation reasonable and necessary in cases where only high-grade PIN is initially found.
Recent studies suggest that the actual risk of finding invasive or high-grade prostate cancer in men with high-grade PIN is lower than previously thought but still relatively high at 24%. A repeat prostate biopsy at 6 to 12 months has long been recommended, but there are additional options now available. These include saturation prostate biopsies, MRI prostate imaging, genomic testing (ConfirmMDx) and MRI-Transrectal Ultrasound Fusion guided biopsies.
Some have suggested that these patients be followed with an active surveillance program, similar to what is used in patients with proven, low-grade prostate cancer. With a lack of consensus on the recommended follow-up, each case needs to be evaluated and treated individually after a full discussion with the patient of the risks, benefits, and limitations of each alternative.
Atypical Small Acinar Proliferation (ASAP)
Also considered a pre-malignant lesion, atypical small acinar proliferation indicates that there are small foci or atypical prostatic glands that are suspicious for cancer but there is insufficient overall evidence of malignancy to diagnose cancer. There is a 40% to 50% chance of finding overt prostate cancer on repeat biopsy, so the consensus recommendation is to repeat the prostatic biopsy with or without MRI image guidance 3 to 6 months after the initial diagnosis of atypical small acinar proliferation.
Atypical Adenomatous Hyperplasia (Adenosis)
First described in 1941, atypical adenomatous hyperplasia is defined as a well-circumscribed nodule or lobule of small prostatic glands that are closely packed. What sets it apart from a diagnosis of prostate cancer is the presence of basal cells and the absence of significant cytologic atypia. There is some controversy regarding whether atypical adenomatous hyperplasia is a pre-malignant lesion or not, but the consensus suggests that it has relatively low malignant potential by itself and does not routinely warrant a repeat biopsy.
Early prostate cancer is usually asymptomatic. However, it may sometimes cause symptoms similar to benign prostatic hyperplasia including frequent urination, nocturia, difficulty starting and maintaining a steady stream, hematuria, and dysuria.
Prostate cancer may also be associated with problems involving sexual function and performance, such as difficulty achieving an erection or painful ejaculation.
Metastatic prostate cancer can cause severe bone pain, often in the vertebrae, pelvis, hips or ribs. Spread into the femur is usually to the proximal part of the bone.
Prostate cancer can result in spinal cord compression; causing tingling, leg weakness, pain, paralysis, and urinary as well as fecal incontinence.
Digital rectal examination (DRE) may detect prostate abnormalities, asymmetry, and suspiciously hard nodules but is not considered a definitive test for prostate cancer by itself. An abnormal DRE initially uncovers about 20% of all prostate cancers.
PSA and Other Pre-Biopsy Prostate Cancer Predictive Tests
Elevated Prostate Specific Antigen (PSA) levels (usually greater than 4 ng/ml) in the blood is how 80% of prostate cancers initially present even though elevated PSA levels alone correctly identify prostate cancer only about 25% to 30% of the time. We recommend at least 2 abnormal PSA levels or the presence of a palpable nodule on DRE to justify a biopsy and further investigation.
The value of PSA screenings remains controversial due to concerns about possible overtreatment of low-risk cancers, overdiagnosis, complications from "unnecessary biopsies," the presumed "limited" actual survival benefit from early diagnosis and treatment, and the true value of definitive therapy intended to cure.
In an attempt to improve on PSA testing alone, many alternative pre-biopsy screening tests are now available:
Free and Total PSA: The percentage of free PSA in the blood can be a useful indicator of malignancy. If the total PSA is between 4 and 10 ng/ml, a free PSA percentage is considered valid. The free PSA percentage is calculated by multiplying the free PSA level by 100 and dividing by the total PSA value.
The actual risk estimates will vary by age group, but as a general guide:
PSA Density is the total PSA divided by the prostatic volume as determined by MRI or ultrasound (US). The formula for the volume of the prostate is Prostate Volume = Width x Height x Length x Pi/6. For most purposes, Pi/6 can be estimated as 0.52 to make the calculations easier. The PSA density is intended to minimize the effect of benign prostatic enlargement. In general, if the PSA density is greater than 0.15, it is considered suggestive of malignancy.
PSA Velocity compares serial, annual PSA serum levels. An annual PSA increase of greater than 0.75 ng/ml or greater than 25% suggests a potential cancer of the prostate (total PSA 4 to 10 ng/ml). If the total PSA is 2.6 to 4 ng/ml, then an annual increase of 0.35 ng/ml would be considered suspicious.
Prostate Cancer Antigen 3 (PCA3) is an RNA based genetic test performed from a urine sample obtained immediately after a prostatic massage. PCA3 is a long, non-coding RNA molecule that is overexpressed exclusively in prostatic malignancies. It is upregulated 66 fold in prostate cancers. If PCA3 is elevated, it suggests the presence of prostate cancer. It is more reliable than PSA as it is independent of prostate volume. PCA3 is best used to determine the need for a repeat biopsy after an initial negative histology. Serial PCA3 testing may also be helpful in monitoring patients with low-grade prostate cancers on active surveillance.
The Prostate Health Index (PHI) is a blood test that includes free PSA, total PSA, and the [-2] proPSA isoform of free PSA. A formula is used to combine these test results mathematically to give the PHI score. This PHI score appears to be superior to PSA, free and total PSA, and PCA3 in predicting the presence of prostate cancer.
Mi-Prostate Score is a predictive algorithm developed at the University of Michigan. It includes PSA, PCA3 and urine TMPRSS2:ERG (a genetic fusion found in about 50% of all prostate cancers). While better than PSA alone, it is currently uncertain if this algorithm significantly outperforms PCA3 alone.
The "4K" Test measures serum total PSA, free PSA, intact PSA and Human Kallikrein Antigen 2. It includes clinical DRE results as well as information from any prior biopsies. These results are compared to a very large, age-matched database and a percentage risk of "significant" prostate cancer is calculated. (Clinically significant prostate cancer is usually defined as Gleason 3 + 4 = 7 or higher disease.) A risk analysis of 10% or more would typically suggest proceeding with a biopsy. Interestingly, the "4K" test has not been shown to be any better than PSA testing alone when used for tracking active surveillance patients.
"ExoDx Prostate Intelliscore (EPI)" uses PCA3 and urinary TMPRSS2:ERG to detect clinically significant prostate cancer.
SelectMDx is a urine based test that measures the urinary mRNA levels of the HOXC6 and DLX1 biomarkers following a prostatic digital rectal exam. Measurements are done utilizing reverse transcriptase quantitative polymerase chain reaction technology. Other clinical information such as age, PSA density, family history, prior biopsy results and digital rectal examination findings are included in the risk stratification. Results are reported very straight-forwardly as either:
In general, predictive testing that includes clinical variables (Select MDx and "4K") are considered somewhat more reliable than those tests which do not (PHI, ExoDx and PCA3).
Ultrasound and MRI are the main imaging modalities used for initial prostate cancer detection and diagnosis.
Prostatic MRI is becoming a standard imaging modality for the diagnosis of prostate cancer. It can identify and grade suspicious prostate nodules to help with staging and localization, check for extracapsular extension, evaluate the seminal vesicles for possible tumor involvement and determine enlargement of regional lymph nodes that might indicate early metastatic disease.
Prostate Imaging, Reporting and Data System (PIRADS)
MRI imaging, unlike CT or x-rays, typically shows denser tissue as dark areas. Standard MRI imaging of the prostate usually requires a 3 Tesla (3T) MRI machine and optimally uses intravenous (IV) contrast, although non-contrast (bi-parametric) MRI tests are quicker, cheaper and still quite useful. IV contrast will demonstrate early vascular entry (faster inflow) and quicker washout from cancerous lesions or nodules compared to normal prostatic tissue.
Various MRI tissue characteristics ultimately determine the relative cancer risk which is documented in the final report as a PIRADS score. A PIRADS score of 1 or 2 is highly unlikely to be cancer. A PIRADS score of 4 or 5 is highly suspicious for clinically significant disease (Gleason 3 + 4 = 7 and higher). PIRADS 3 is equivocal. Histological confirmation with a biopsy is recommended for all PIRADS 3, 4 and 5 lesions.
PIRADS 3 lesions usually demonstrate benign histology on biopsy, but low-grade prostate cancer is possible, and it cannot reliably exclude intermediate or high-grade pathology. About 20% (17% to 25%) of all PIRADS 3 patients biopsied will demonstrate intermediate or high-grade cancer pathology.
Recent studies of PIRADS 3 lesions have identified several clinical risk factors that were clearly associated with significant disease (Gleason score 3 + 4 = 7 and higher).
Risk Factors Identified for PIRADS 3 Lesions Include:
The studies reported that 100% of the PIRADS 3 patients with all the above risk factors positive showed clinically significant disease, 0% if they had no risk factors. Incorporating these and other risk factors as well as genomic analysis testing into a workable clinical algorithm for patients with PIRADS 3 lesions would greatly improve our ability to identify those with aggressive, clinically significant disease while safely avoiding uncomfortable and unnecessary biopsies in the rest.
When an MRI identifies a suspicious area, there are several ways to target or highlight the lesion for improved biopsies:
If cancer is suspected, a prostate biopsy is usually performed. This is almost always done with transrectal ultrasound guidance to make sure that all areas of the prostate are adequately sampled. The most commonly used pattern is to take two specimens from each of three areas (base, mid-gland, and apex) on both sides. This is called a 12 core sextant biopsy. The purpose is to identify the extent and exact location of the tumor better.
Prostatic imaging with MRI is becoming increasingly important, particularly in highly suspicious cases where the initial non-MRI guided biopsy was negative, instead of "saturation" biopsies.
The Only Test that can Dependably and Conclusively Confirm a Cancer Diagnosis is Still a Prostate Biopsy, Which Remains the Recommended Standard of Care.
Genomic Tumor Markers (Post-Biopsy)
Tissue samples can be analyzed for various genomic tumor markers. Several commercial genomic tests ("Oncotype Dx," "Prolaris," “Promark,” and "ProstaVysion") are now able to reliably estimate a patient's prognosis, tumor aggressiveness and relative genetic risk from a single prostate cancer tissue sample. These genomic markers are probably best used for patients with low and intermediate risk cancers (Gleason 3 + 3 = 6 and Gleason 3 + 4 = 7) to help with treatment selection, particularly for those patients who might be candidates for active surveillance. The intention is to confirm that the patients who are eligible and select active surveillance also have low-risk genomic markers. If their genomic analysis shows higher risk, they should be counselled accordingly.
“ConfirmMDx”, another genomic marker test, uses DNA methylation analysis of cytosines to determine the relative risk of significant occult disease from a tissue sample in high-risk men with histologically negative biopsies, High-Grade PIN, or ASAP. It is most useful when the prostate biopsies are negative in patients at high risk for occult prostate cancer. It has been shown to have a negative predictive value of 96% for detecting Gleason Grade 4 or 5 disease (Gleason Sum 7 or higher).
"Oncotype Dx" measures 17 gene expressions while "Promark" is an automated immunofluroescence based assay. Both are most useful in men with low grade (Gleason 3+3=6) or intermediate grade (Gleason 3=4=7) disease where either active surveillance or definitive primary therapy are reasonable treatment options.
"Prolaris" measures gene expressions from 46 different genetic sites. It is most useful for men on active surveillance, who have undergone radiation therapy or where patients had a positive finding of prostate cancer after transurethral resection (TURP). It has been associated with cancer speciifc mortality for men on active surveillance and with biochemical recurrence for those who have had radiation therapy or undergone TURP surgery.
“Decipher” uses the expression of 22 RNA biomarkers to calculate the probability of clinical metastasis within 5 years of definitive therapy and prostate cancer specific mortality at 10 years. The purpose is to help avoid overtreatment by reclassifying those men originally identified as high risk who are unlikely to develop metastatic disease and might safely avoid salvage radiation therapy after radical prostatectomy surgery. “Decipher” is most useful for higher risk patients with localized disease who have already undergone radical prostatectomy and are potential candidates for salvage radiation therapy. Studies have demonstrated that 60% of the men considered high risk after surgery were reclassified to a lower risk category following "Decipher" genomic testing. Salvage radiation therapy was safely avoided in 50% of the high-risk patients tested, and 98.5% of those identified as low risk by genomic testing did not develop metastases within 5 years of their radical prostatectomy procedures.
Research is ongoing into improved genomic analyses and clinically useful biomarkers. For example, one of the more promising biomarkers looks at the overexpression of regenerating liver-3 phosphatase (PRL-3) which has been associated with high-grade, aggressive prostate cancer. The difference in nuclear/cytoplasmic ratio of PRL-3 seems to be able to reliably distinguish intermediate-grade disease (Gleason 3 + 4 = 7) from the more aggressive, high-grade disease (Gleason 4 + 3 = 7 and higher). Digital analysis of PRL-3 immunostained tumor samples could potentially not only be a reliable indicator of high-grade prostate cancer but could also distinguish between intermediate and high-grade malignancies.
Other interesting markers include Post-Operative Therapy Outcomes Score (PORTOS), which is a panel specifically designed to predict response to external beam radiotherapy, and PAM50 subtyping which seems to predict response to hormonal therapy
PRL-3, PORTOS, PAM50 and many other similar experimental biomarkers are currently being investigated for their potential role in clinical decision-making in prostate cancer.
The first decision in managing prostate cancer is determining whether any treatment at all is needed. Prostate cancer, especially low-grade tumors, often grow so slowly that frequently no treatment is required; particularly in elderly patients and those with comorbidities that would reasonably limit life expectancy to 10 additional years or less.
Many low-risk cases can now be followed with active surveillance. In active surveillance, patients are usually required to have regular, periodic PSA testing and at least one additional biopsy 12 to 18 months after the original diagnosis. Active surveillance is appropriate for men with low-grade prostate cancer (Gleason 3+3=6 or less with a PSA less than 20) and limited sized cancers. Genomic testing can be considered in these cases but may be most helpful when the PSA is in the 10 to 20 ng/ml range, or there is increased tumor volume.
It is estimated that only 32% to 49% of eligible low-risk prostate cancer patients are currently on an active surveillance protocol in the United States.
Use of active surveillance for selected, lower risk, intermediate-grade prostate cancers (Gleason 3 + 4 = 7 with a PSA less than 10) is controversial but seems reasonable in selected cases. This is where genomic testing can offer some real benefits; by reliably estimating and clarifying the true relative risk of tumor progression and aggressiveness in these borderline situations.
MRI of the prostate can also be used to follow these patients and avoids the discomfort of repeated biopsies. The purpose of close observation is to identify those patients, usually about 25% of the total, who will significantly increase PSA levels, clinically progress or upgrade to a higher Gleason score. This indicates possible conversion to a more aggressive cancer and definitive treatment can then be offered appropriately while the vast majority are safely spared the costs, inconvenience, side effects, and complications of curative therapy.
The best option depends on the cancer stage, Gleason score, and the PSA level as well as individual patient preferences, health, comorbidities, quality of life, and age.
In localized disease, it should be understood that for the majority of patients, treatment selection makes very little difference in overall survival for at least the next 10 years. Therefore, definitive therapy should only be offered to those patients who are reasonably expected to live another ten years or longer based on age and co-morbidities.
Definitive treatment of localized disease now includes radiation therapy (external beam and/or brachytherapy radioactive seed placement), radical prostatectomy and cryotherapy (usually reserved for radiation therapy failures). Radiation therapy tends to have much fewer side effects (about 50% less) than radical prostatectomy surgery with very similar overall survival.
Therefore, for most patients with potentially curable, localized disease, good performance status, reasonably good quality of life and greater than 10-year life expectancy, the choice of treatment should be an informed patient decision made after discussions including both urology (surgery) and radiation therapy.
Because definitive therapy can have significant side effects such as erectile dysfunction and urinary incontinence, discussions often focus on balancing the goals of therapy (possible cancer cure, the potential for increased survival, psychologically "getting rid" of the cancer) with the risks of lifestyle alterations (treatment side effects, complications, cost, possible lack of ultimate survival benefit and questionable quality of life improvement over doing nothing).
Focal Ablation Therapy for Localized Prostate Cancer
The use of MRI localization has opened the door for local ablative therapy for selected patients with localized disease since we can now clearly identify the precise location of suspicious or significant tumors. In many cases, the risks, complications and side effects of definitive whole-gland therapy outweigh many of the benefits of oncological control. There is a need to find a treatment modality between active surveillance and definitive whole-gland therapy with lower cost and fewer side effects. Focal ablative therapy is potentially the answer.
Focal ablative therapy can use any one of a number of ablative energies including microwave, cryotherapy, laser, high intensity focused ultrasound, etc., to precisely treat a localized malignant prostatic lesion. Ablative therapies typically have lower costs and substantially fewer side effects than traditional definitive whole-gland therapy. Optimal patients would be those with a single, isolated Gleason 7 (3 + 4 or 4 + 3) lesion and no evidence of extraprostatic or more widespread disease on MRI or prostatic biopsies.
The issue that is unsettled is how effectively focal ablative therapy will control or cure localized prostate cancer and which technologies will ultimately provide the best combination of cancer control and minimal side effects. Focal ablative therapies for localized prostate cancer are currently considered investigational in the United States.
In 1941, Urologist Charles Huggins MD from the University of Chicago discovered that androgen deprivation (castration) would cause prostate glands to atrophy and prostate cancer to regress. He was awarded the Nobel Prize for Medicine in 1966 for this discovery which is the basis for all hormonal (testosterone deprivation based) treatment used in prostate cancer. This was the first effective systemic therapy for prostate cancer, and it still is extremely useful in putting cancer into remission. This beneficial hormonal effect typically lasts an average of about two years, but virtually all prostate cancers will eventually escape and regrow.
While bilateral orchiectomy was originally used to produce castration levels of testosterone, current hormonal therapy is usually done with injectable medications.
Initial therapy with leuprolide, goserelin and similar luteinizing hormone-releasing hormone (LHRH) agonists should be preceded by anti-androgen therapy, such as bicalutamide (Casodex), when the PSA level is greater than 10 ng/ml to prevent any clinical response to the temporary testosterone surge that often accompanies initiation of hormonal therapy with these agents. This prophylactic anti-androgen therapy is not necessary with degarelix (Firmagon) because it is a direct LHRH antagonist and there is no testosterone surge with this drug.
Hormonal therapy has been found to improve survival when combined with radiation therapy but not with radical prostatectomy for intermediate (Gleason 3 + 4 = 7) and higher grade disease. One common plan is to start with leuprolide or similar agents and monitor the PSA level monthly until it becomes undetectable or nadirs at which time definitive radiation therapy (cyberknife, external beam and/or brachytherapy seed implants) can be started. The hormonal therapy is usually continued for at least one year and optimally for at least two years after radiation. Intermittent hormone therapy is another option in selected cases to minimize the side effects of sustained, very low testosterone levels. (Castration levels of testosterone have historically been considered <50 ng/dL, but newer data suggests that optimal results are obtained when testosterone levels are maintained at less than 20 ng/dL.)
Patients with high volume prostate cancer and metastases who are being started on hormonal therapy will benefit from initiating docetaxel at the same time. There appears to be no similar survival advantage in low volume prostate cancers with metastases.
Side effects of hormonal therapy include hot flashes, reduced libido, and loss of bone density resulting in osteopenia or osteoporosis. Hot flashes can be minimized with venlafaxine and similar SSRIs, gabapentin, megestrol acetate, or Depo-Provera injections. There are conflicting reports regarding a possible connection between long-term androgen deprivation therapy and cardiovascular risk. Long-term hormonal therapy for prostate cancer will tend to increase clotting risk, LDL cholesterol, body fat, triglycerides, and insulin resistance while decreasing lean body mass and glucose tolerance. Its most profound and potentially dangerous cardiac effect may be to prolong the QTc interval. These effects can be minimized by aggressively treating comorbidities, reducing cardiac risk factors and eliminating all other drugs that also tend to prolong QTc interval. Urologic medications that typically increase the QTc interval include levofloxacin, amitriptyline, and imipramine. Patients with significant cardiovascular risk factors or pre-existing heart disease are at increased risk and should be monitored closely by cardiology or primary care. Medical check-ups every 3 months has been recommended for this particular high-risk group of patients, especially during the first year of hormonal therapy when the risk of an acute cardiovascular event is highest.
Use of calcium with vitamin D supplements, along with a bisphosphonate or rank ligand inhibitor, is recommended in long-term hormonal treatment (typically defined as 1 year or longer) to prevent bone loss. A baseline DEXA scan is suggested.
Radical prostatectomy offers the greatest potential for a definitive cure for localized prostate cancer and a significant improvement in overall survival, cancer-specific survival and the development of distant metastases. These benefits over other definitive, curative therapies are not evident before 10 years after treatment for localized disease and are most pronounced in men younger than 65 years at the time of diagnosis. Radical prostatectomy is not an appropriate therapy if the tumor is fixed to surrounding structures or there are distant metastases.
The majority of such surgeries are now being done robotically or laparoscopically. There does not appear to be much of a difference overall in side effects or survival between minimally invasive (robotic) or open surgical approaches. The experience of the surgeon appears to be the most critical factor associated with a successful outcome regardless of which technique is used.
Individual patient issues would include activity level, age, continence, co-morbidities, performance status, and pre-surgical erectile function as well as whether or not lymphadenectomy will be performed and if a nerve-sparing technique will be used. It is recommended that a bilateral nerve-sparing approach is used whenever it will not compromise the complete removal of the malignancy. MRI imaging is very helpful in making these determinations.
Lymph Node Dissections
Performing a lymph node dissection is based on the expected incidence of finding malignant involvement. In general, it can be safely omitted in selected patients with low-risk disease (smaller tumors with lower PSA levels and favorable Gleason scores).
The optimal extent of the lymph node dissection is uncertain. A greater and more extensive lymph node dissection is obviously likely to find a larger number of positive lymph nodes. In the past, a pelvic lymph node dissection was sufficient, but it is now known that metastases will often go directly to the common iliac, para-aortic, peri-rectal or pre-sacral nodes, so a more extended dissection is recommended; particularly in higher risk disease.
No improvement in overall longevity from lymph node dissections has been clearly demonstrated, although some men with the microscopic lymphatic disease have had prolonged survival which suggests the possibility of a benefit from the procedure.
Salvage Radiation Therapy After Radical Prostatectomy
The serum PSA should become and remain undetectable after successful radical prostatectomy surgery. If this cannot be achieved or if there are positive margins after surgery, salvage radiation therapy should be considered.
This is recommended based on the likelihood that the supplemental radiation may control the relatively small amount of cancer that might remain in the vicinity of the resected prostate. Typically, salvage radiation therapy is 60 to 70 Gy, which is substantially less than for primary definitive radiation therapy.
Without treatment, metastatic disease can develop from microscopic cancer remnants after radical prostate surgery in about 8 years and overall survival averages about 10 to 13 years.
Salvage radiation therapy may also be recommended if the PSA becomes detectable at a later date, indicating possible residual disease that was present but previously undetectable could now be growing in the immediate area of the prostatic bed. Of course, there is no guarantee that any and all remaining cancer will be within the radiation field and it should not be considered with clear evidence of distant metastatic tumor spread.
Early data suggests that everolimus at 10 mg/day can be safe, helpful and effective when combined with salvage radiation therapy for post-prostatectomy biochemical failures or recurrences.
As an alternative, some patients with only limited positive margins or extracapsular extension may choose close monitoring and delay the salvage radiation therapy until there is a PSA spike, rise or other evidence of disease progression. However, this risks developing distant metastases that could have been prevented with earlier radiation treatment. The “Decipher” genomic test can be helpful in assessing and reliably estimating an individual patient's relative risk in these situations.
PSA doubling time is another prognostic indicator. A slow doubling time might reasonably suggest observation instead of therapy for lower risk patients. Patients with a rapid PSA doubling time generally have poorer outcomes.
Identifying the location of recurrent disease can be difficult when there is a biochemical recurrence. There is little point in salvage radiation therapy to the prostatic bed if there are distant metastases or spread outside the possible radiation field. Prostate Specific Membrane Antigen (PSMA) Gallium PET/CT scans can be helpful in identifying local recurrences, but the PSA level needs to be over 1 to 1.5 for the recurrence site to be visible on the scan.
Complications of Radical Prostatectomy include erectile dysfunction (especially if no nerve-sparing surgery was performed), urinary incontinence (especially stress type reported in 52% initially), urethral strictures (8% to 11%) and an increased risk of inguinal hernias (by 6% to 8%). Overall mortality rates are less than 1% in most series. Rates for erectile dysfunction vary greatly depending on pre-operative potency and age as well as the type of surgery performed (nerve-sparing or not) and the use of penile rehabilitation techniques.
If radiation therapy is done first and fails, then salvage radical prostatectomy surgery becomes very challenging and is often impossible due to scarring, fibrosis, and loss of anatomical landmarks. However, cryotherapy would still be possible as a salvage treatment.
The use of freezing technology to kill cancer cells is not new; it was first used in London in the 19th century for breast and cervical cancers. Modern cryotherapy required the development of closed circulation liquid Nitrogen probes and one of the first uses of this new technology was for benign prostatic hyperplasia in 1966.
Cryotherapy provides good tissue ablation and destruction, but has some complications and is very technology dependent. Early use was delayed due to the size of the original Nitrogen probes, urethral injuries and the inability to monitor the exact location of the probes and ice-ball in real time. These problems were solved by technological advances including the use of transrectal ultrasound to visualize the size and shape of the ice-ball, more precise freezing probe placement, use of multiple strategically placed interstitial temperature sensors to prevent over-freezing, utilizing multiple smaller probes simultaneously based on Argon gas for freezing instead of the harder to use liquid nitrogen, adding a thaw cycle to the protocol, and the standard placement of urethral warming catheters to protect the urethra from injury.
The use of two freeze/thaw cycles instead of just one, rapid freezing to -40 C with slow thawing, and appropriate use of hormonal therapy to shrink larger prostates (greater than 60 gm) before treatment appears to improve the cancer-free results. Hormonal therapy can help reduce prostate size but does not otherwise improve survival outcomes with cryotherapy.
The incidence of erectile dysfunction is relatively high with cryotherapy which is an issue that should be discussed with patients before treatment.
Cryotherapy can be the primary surgical therapy for prostate cancer, but it is probably most useful as a salvage surgical treatment after radiation therapy has failed. In these cases, evidenced by persistent or rising PSA after radiation treatment, additional radiation or radical surgery is often extremely difficult, hazardous or no longer even possible. Hormonal therapy is often used in such cases but is not a curative option.
Cryotherapy has shown it can control tumors resistant to all other therapies which will still be susceptible to ablation by alternating freeze-thaw cycles that disrupt cell membranes resulting in tissue destruction. In such cases, it is important to be sure that the malignancy is still confined to the prostate. Since cryotherapy cannot treat nodal involvement, lymph node dissections may be needed.
Focal or limited cryotherapy is a possible experimental option in selected patients.
The goal of radiation therapy is to provide a lethal dose of radiation to the tumor without harming the surrounding normal tissue of the bladder and rectum.
No post-radiation prostate biopsies are recommended unless additional local therapy is being considered.
After radiation therapy, the PSA is expected to decrease for about 18 months.
Treatment failure is usually noted by a rise in PSA level of 2 ng/ml or more above the baseline level before initiation of radiation therapy.
External Beam Radiation Therapy
Treatment fields are calculated and individualized from MRIs or CT scans, as some patients will need treatment for the seminal vesicles and/or regional lymph nodes. These other areas are included in the radiation field when there is direct evidence of tumor involvement, or the calculated likelihood of malignancy is 15% or more.
The current standard of care is to use conformal techniques, such as intensity modulated radiation therapy (IMRT), and image-guided radiation therapy (IGRT). Such conformal techniques allow for higher dosages to be given to the prostate and tumor while not significantly increasing exposure to the surrounding tissues to minimize late side effects.
Treatment usually consists of daily exposures (5 days a week) for up to 8 weeks. This typically amounts to a minimum of 38 to 45 fractions of 1.8 to 2 Gy. The American College of Radiology recommends a total dose of 75 to 78 Gy. (At our institution, our radiation oncologists use a total dose of 77.4 Gy.) Doses higher than 81 Gy are not recommended due to increased risks of radiation cystitis and proctitis.
The use of hormonal therapy in combination with radiation has demonstrated improved overall survival in intermediate and high-risk disease. It appears that hormonal therapy increases tumor radio-sensitivity by interfering with DNA double-stranded break repair. That is why the addition of hormonal treatment with LHRH agonists or similar medications before starting radiation therapy is now generally considered the standard of care. Preliminary data suggests adding enzalutamide to standard hormonal therapy will enhance this radio-sensitizing effect.
Various drugs are being investigated as possible prostate cancer radio-sensitizers. Besides hormonal therapy and enzalutamide described above, these include statins, IL-37, parthenolide and even green tea. So far, none are currently recommended for clinical practice.
Complications from External Beam Radiation Therapy
Major areas of concern include prostate size and potential radiation side effects to the bowel and bladder (radiation proctitis and cystitis).
There is an increased risk of hematuria in up to 15% of patients, especially if anticoagulated. Management of hemorrhagic complications of radiation cystitis includes oral pentosan polysulfate (Elmiron) and hyperbaric oxygen therapy. Severe hematuria may require cystoscopy and continuous bladder irrigation. If not successful, bladder instillations with 1% alum, aminocaproic acid (Amicar) and formalin may be required (up to a 10% formalin solution can be used but 4% is the preferred concentration).
Erectile dysfunction is another relatively common complication that has been reported in 30% to 45% of men who were potent before starting radiation therapy.
There are also possible issues with fatigue and increased fracture risk.
There is a very slightly higher incidence of secondary malignancies after definitive radiation therapy.
Stereotactic Ablative Radiotherapy (SABR)
The role of stereotactic radiotherapy (Calypso, Cyberknife) in prostate cancer is less well defined than standard external beam radiation. With stereotactic therapy, the individual fractionated dosages are higher, typically 7 to 8 Gy each, which allows for a much reduced total treatment time, usually only about a week. Higher fractionated dosages beyond 8 Gy are not recommended as they have been associated with increased toxicity and side effects. Stereotactic radiotherapy is less suitable for patients with very large prostate volumes (greater than 75 to 100 mL) or prior TURP surgery. Most experts prefer real-time tracking, and early reports suggest using urethral catheterization during treatment planning and simulation improves urethral identification. Newer SABR delivery systems include gantry devices which are currently undergoing clinical trials. It is hypothesized that using SABR for metastatic cancer may be reasonable to reduce seeding of additional tumors whichmay ultimately increase overall and progression-free survival. This strategy has already been shown to improve survival in metastatic non-small cell lung cancer but is still theoretical for use in prostate cancer.
Stereotactic ablative radiation therapy (SABR) may increase the patient's immune response. The proposed mechanism is through the release of additional tumor antigens, due to the larger fractional radiation dosage, which then prompts the increased immunological response.
Overall, stereotactic radiotherapy appears to be similar in efficacy to other definitive treatments for low and intermediate risk prostate cancers. This treatment is a reasonable alternative for appropriate low and intermediate risk patients who desire the markedly reduced treatment schedule and have access to the technology. There have not been sufficient numbers of higher risk patients reported to date to comfortably recommend stereotactic radiation to the high-risk prostate cancer group, although early reports suggest improved biochemical (PSA) control compared to standard external beam radiation therapy.
Brachytherapy (Radioactive Seed Implants)
Brachytherapy is another form of radiation therapy that involves surgically implanting tiny radioactive seeds into the prostate. Conceptually, this allows for a higher total dose to be delivered to the prostate without increasing exposure to surrounding structures. It also allows for optimal treatment in patients where transportation and other issues would make standard external beam therapy more difficult. Most prostates will accept from 75 to 125 seeds.
Hormonal therapy can be used to shrink the prostate if it is too large for therapy (greater than 60 gm). Three months of hormonal therapy will decrease the size of the prostate by about 30%.
When combined with brachytherapy, hormonal therapy has been shown to improve survival outcomes so it is usually recommended.
Seeds are placed transperineally using TRUS and a template plan that has been previously worked out by a radiation therapist or physicist.
Radioactive materials used include Iodine 125, Palladium 103, and Cesium 131. The Cesium has the shortest half-life.
High-Dose Rate Brachytherapy can also be done, using hollow needles placed through the perineum which are then loaded with Iridium 192 or similar. These typically are left in place for 24 to 40 hours during which time the patient is admitted to a hospital. The newer trend is to treat with only 2 fractions per day, allowing the patient to go home at night.
External beam radiation can then be used to treat regional lymph nodes and other areas outside the prostate not adequately controlled by the seeds alone.
Outcomes are similar to external beam radiation and radical prostatectomy surgery, but there is no head to head trials. However, there is some evidence suggesting that brachytherapy might be somewhat more effective than external beam at least in some patients.
The most common complications reported from brachytherapy include exacerbation of urinary tract and rectal problems along with erectile dysfunction and seed migration. In other words, the complications are very similar to external beam therapy with the additional risk of radioactive seed embolization which may occur in up to 55% of brachytherapy patients. The use of stranded seeds, such as "Rapidstrands," significantly reduces the seed migration rate. The clinical impact of seed migration is still unclear.
American Urological Association and American Society for Radiation Oncology Joint Guidelines Statement on Radiation Therapy:
Proton Beam Therapy can theoretically deliver a higher dose of radiation more precisely than standard techniques. While theoretically an improvement, there are no randomized trials comparing proton beam therapy directly with standard radiation treatment. The current recommendation from the American Society for Radiation Oncology states that the best available data suggests that outcomes are similar between proton beam therapy and standard IMRT.
Carbon Ion Therapy is another type of particle beam irradiation that is under investigation in Japan. Preliminary data appears promising.
Treatment Selection: Radiation Therapy versus Radical Prostatectomy
Radiation therapy and radical prostatectomy surgery are both highly effective for controlling most cases of localized prostate cancer. Treatment selection is then based on other factors such as patient preference, co-morbidities, age, availability of high-quality therapy, and transportation issues.
Technology is continually changing to optimize radiation delivery to the cancer while minimizing side effects, peripheral exposure, spillage and long-term complications. That is why it is difficult to compare radiation therapy and radical surgery results as we are looking now at the outcomes data from radiation therapy delivered 10 to 15 years ago when the technology was less advanced than what is typically given today.
The best available data suggest no significant difference in overall survival in most cases of potentially curable, localized, prostate cancer treated with either external beam radiation therapy, stereotactic radiotherapy, brachytherapy (radioactive seed implants), or radical prostatectomy surgery.
Aggressive Prostate Cancer
Aggressive disease in prostate cancer is usually defined as either locally advanced, higher Gleason score (Gleason 4 + 5 = 9 or higher) or rapid PSA doubling time of two years or less. Treatment of aggressive prostate cancers may involve radical prostatectomy, radiation therapy, high-intensity focused ultrasound, chemotherapy, oral chemotherapeutic drugs, cryosurgery, hormonal therapy, immunotherapy, or some combination of these. Early use of chemotherapy has been shown to be helpful in many patients presenting with aggressive or advanced, localized disease.
If cancer has spread beyond the prostate, treatment options significantly change. Hormonal therapy, limited radiation therapy, radiopharmaceuticals, immunotherapy, and chemotherapy are the standard treatments reserved for a disease that has spread beyond the prostate and is no longer considered curable. For example, limited radiation therapy can dramatically help control prostatic bleeding or alleviate the excruciating bone pain from a metastatic cancer deposit.
Most hormone-sensitive cancers eventually become resistant to hormonal therapy and resume growth. At this point, the disease is considered castrate-resistant prostate cancer (CRPC) and requires additional treatment, usually chemotherapy. It has been estimated that 106,505 men in the US have localized (non-metastatic) CRPC. Of these, 90% will ultimately progress to the bone and other metastases potentially causing severe pain, pathological fractures and spinal cord compression with paralysis.
PSMA and Choline PET Scans
Prostate Specific Membrane Antigen (PSMA) is a membrane-bound metallopeptidase. It is overexpressed in 90% to 100% of all prostate cancer cells which makes it a reliable tissue marker that can be used for tumore specific imaging as well as therapy. Compared to conventional radiological techniques (CT and MRI), PET scans appear to be far more accurate. Choline PET/CT scans are also proving to be useful imaging modalities to locate prostate cancer. All of these PET based technologies are best used for biochemical recurrences (rising PSA) after definitive therapy. Some can use either a diagnostic imaging agent, such as Gallium 68, or a therapeutic nuclide (PSMA-617). These are emerging technologies and their use in clinical practice is still being determined.
Chemotherapy in the modern era typically consists of docetaxel in addition to modified hormonal therapy.
About 90% of patients with CRPC will develop bony prostate cancer metastases which can be extremely painful; therefore, much of the therapy at this stage is directed at the bone.
Bisphosphonates like zoledronic acid (Zometa) and rank ligand inhibitors like denosumab (Xgeva), have been shown to improve quality of life and reduce pathological fractures in CRPC patients. Unfortunately, these agents have not been shown to improve survival.
Radium Ra 223 dichloride (Xofigo) is a radiopharmaceutical that works particularly well on bone metastases from prostate cancer. It has been shown to improve overall survival in CRPC patients by 30% which sounds good but is only about 3 to 4 months for most recipients. Xofigo specifically targets bone and is ineffective in visceral, soft tissue and nodal disease. Therefore it should be used in CRPC with bone metastases but without significant organ, soft tissue or lymph node involvement. Xofigo improves quality of life, reduces bone fracture rates and extends survival even if only for a relatively short time. It can be used with all other prostate cancer therapies. However, recent data suggests that there may be an increased risk of fractures and deaths associated with the use of Ra-223 (Xofigo) together with abiraterone and prednisone. Until more information is available, this particular combination should be avoided.
Sipuleucel-T (Provenge), a prostate cancer vaccine, has been found to result in a tangible survival benefit for men with metastatic, castrate-resistant prostate cancer but it is quite expensive and provides only a relatively limited improvement in life expectancy. (Note: The drug remains available even though its manufacturer, Dendreon, has declared bankruptcy.) It is an autologous, dendritic cell-based vaccine that targets prostatic acid phosphatase. It is the only vaccine-based therapy currently available for prostate cancer in the US but a number of others are in various stages of development. We need to develop reliable prostate cancer biomarkers to help determine which future immunotherapy will offer the most benefit for each individual patient.
An important part of evaluating prostate cancer is determining the stage. The most commonly used staging system is the three-stage TNM (tumor/nodes/metastases) classification. Its components include the size and extent of the tumor, the presence of involved lymph nodes, the PSA level, the Gleason score (from a biopsy or surgical specimen) and the presence of metastases. When cancer cells spread from the prostate to other parts of the body, they most commonly go to the bones and lymph nodes.
The Key Distinction in Prostate Cancer Staging is Whether or Not the Cancer is Confined to the Prostate and is Therefore Potentially Curable.
Clinical Tumor Staging
Pathologic Tumor Staging
Testing For Evidence of Tumor Spread
CT scans, MRIs, Bone Scans and PET Scans can evaluate for any cancer spread within the abdomen and pelvis, particularly to the regional and para-aortic lymph nodes.
Predictive Value of a Single, Early PSA Level in Younger Men (Ages 40 to 45)
The European Association of Urology Guidelines states that for men in their early 40s, any PSA level beyond one ng/ml indicates a higher long-term prostate cancer risk and warrants closer monitoring. This statement is supported by evidence from several long-term studies and databases such as the Baltimore Longitudinal Study of Aging, the Department of Defense Serum Repository Study, the Duke Prostate Database Report, and the Malmo Preventive Project, among others. These studies all demonstrate that a single PSA test of less than 1 ng/ml in a man in his early 40s is an excellent predictor of good prostate health and not getting prostate cancer for the next 25 years or so. Performing a PSA test in this young age group would also help find the small percentage of men who develop very aggressive and highly lethal prostate cancer before age 50.
For example, the bestselling author of "American Assassin," Vince Flynn, died of metastatic prostate cancer at age 47. Getting his initial PSA test at age 50 would not have helped him.
Predictive Tables and Nomograms
Various predictive tables and nomograms are now available to help predict outcomes, positive lymph nodes, survival after radical prostatectomy, based on outcomes data from various sources. They include some combination of age, Gleason score, biopsy information and PSA level. They may also require other clinical information such as the number of positive biopsies with the percentage of tumor involvement, as well as clinical and pathological staging.
When Advanced Prostate Cancer Causes Bilateral Hydronephrosis
Prostate cancer may directly extend into the bladder sub-trigonally, causing hydronephrosis and eventually renal failure if both ureters become obstructed. When this happens, a decision needs to be made whether or not to proceed with treatment. This is typically late in the course of the disease and is usually painless, as it occurs slowly and incrementally.
Gradually increasing renal failure is usually a painless and natural way to peacefully expire. Patients slowly become more lethargic and eventually just go to sleep. This may be preferable to forcing them to endure increasingly severe and debilitating pain from advancing disease and bone metastases. Treating the ureteral blockage may improve survival temporarily, but typically for just a few months.
This is an important decision point for the patient and family. Palliative care and/or hospice services should certainly be involved at this point if not engaged previously.
Treatment of hydronephrosis for obstructive prostate cancer may include surgical transurethral resection of the tumor inside the bladder over the expected location of the ureterovesical junction and intramural ureters. The resection only needs to be sufficient to unroof or expose the ureteral lumen, but this is not always technically possible due to the loss of landmarks, anatomical distortion and possible lack of mobility of the scope due to cancer. Once the ureteral lumen is exposed, a double J stent can be used to maintain urinary drainage. Double J stents can be difficult to place in these cases unless the ureteral lumen is surgically exposed or opened first.
Nephrostomy tubes are another possible solution when one or both ureters cannot be identified or opened transurethrally. In such cases, antegrade placement of a double J stent from above is far easier than the standard transurethral retrograde method.
Ultimately, only one kidney needs to be drained and made functional. Studies have shown there is no survival advantage to treating both kidneys in these situations.
Do We Absolutely, Positively Need to Have a Positive Prostate Tissue Biopsy to Treat Prostate Cancer?
While a positive tissue biopsy is always preferred prior to treatment, situations arise where it may not be practical or obtainable. Patients may present requiring treatment who have a history of prostate cancer treated elsewhere with no confirmatory records immediately available. Other patients may have had a prior bad experience with an earlier biopsy and are now refusing all new diagnostic procedures. Perhaps there are medical issues, such as a new cardiac stent or a history of pulmonary embolisms, which require an extended period of significant anticoagulants that preclude doing the biopsy.
With the use of MRI imaging, genomic-analysis testing, validated prostatic nomograms, and all of the other pre-biopsy predictive tests, it is not unreasonable to consider initiating some degree of prostate cancer treatment in selected cases even without absolute histological confirmation of malignancy if the likelihood of a cancer is sufficiently high. Such cases are likely to be infrequent, and patients need to be fully informed regarding the standard of care as well as the possibility of treatment complications and side effects without the absolute assurance that they have a prostatic malignancy that is sufficiently aggressive to justify the therapy.
Prognosis and Survival
In the United States, patients with localized or regional disease at the time of diagnosis have a 5-year survival rate of nearly 100% while patients presenting with distant metastases have a 5-year overall survival rate of only 29%.
In patients who undergo treatment, the most important prognostic indicators are patient age and general health at the time of diagnosis, as well as, the cancer stage, pre-therapy PSA level, and Gleason score.
A poorer prognosis is associated with higher grade disease, more advanced stage, younger age, increased PSA levels and a shorter "PSA doubling time."
There is no clear evidence that either radical prostate surgery or radiation therapy have a significant survival advantage over the other, so treatment selection has relatively little effect on life expectancy.
Palliative Care and Hospice
Palliative Care focuses on treating the symptoms of cancer and improving quality of life. The goal of palliative care is symptom control and pain relief rather than curing cancer.
Cancer pain related to bone metastases may be treated with bisphosphonates, rank ligand inhibitors, opioids, radiopharmaceuticals, and palliative radiation therapy.
Spinal cord compression can be treated with steroids, surgery, or radiation therapy.
A common mistake is failing to get palliative care and Hospice services involved early enough in the course of the disease so they can start assistance immediately when needed, without undue delays.
PSA Testing: The Pros and the Cons
About 80% of the patients diagnosed with prostate cancer are initially investigated due to an elevated serum prostate-specific antigen (PSA).
While it unquestionably increases prostate cancer detection rates, the value of PSA testing is less clear in avoiding overtreatment, improving quality of life and lengthening overall survival; which is why routine PSA screening for prostate cancer remains quite controversial.
PSA is a protein produced by the prostate. It was originally used as a prostatic tissue stain to help determine the etiology of tumors of unknown origin. Later, serum levels of PSA were used to screen patients for prostate cancer, as it was found to be a good indicator of prostatic disorders although it is not specific for cancer. PSA is also elevated in benign prostatic hyperplasia, infection, infarction, inflammation (prostatitis) and after prostatic manipulation.
PSA testing became widely available in the United States in 1992, and since then, prostate cancer detection rates have increased substantially.
More impressively, according to the National Cancer Institute, since 1992 the death rate from prostate cancer in the United States has dropped by an amazing 44% that is substantially due to PSA screenings resulting in earlier prostate cancer diagnosis and treatment.
The current controversy is whether PSA screening provides sufficient benefits to offset the complications and side effects of "unnecessary" biopsies and curative therapies since most men with prostate cancer will have slow-growing, low-grade cancers for whom definitive, curative therapy often causes considerable harm with little or no survival benefit.
The Current USPSTF Recommendation
For men 55 to 69 years of age, the decision regarding whether to be screened for prostate cancer by PSA should be an individual one after a full discussion about the benefits, harms, and limitations of such screening.
Routine PSA screenings are not recommended in men 70 years or over, based on the conclusion that definitive treatment of localized cancers for most older men has minimal effect on overall survival while adding significant treatment side effects and morbidities to many.
Many professional organizations now have guidelines and recommendations regarding PSA screening for prostate cancer. Most include a recommendation for an informed discussion with patients about the benefits and potential risks of screenings, biopsies, definitive therapy, and possible overtreatment.
Prostate Cancer Screening: The Pros and Cons
Screening options include the digital rectal exam and a prostate-specific antigen (PSA) blood test. Such screenings may lead to a biopsy with some associated risks. Transrectal ultrasound has no diagnostic role in prostate cancer screenings.
Routine screening with a DRE and particularly a PSA test has become very controversial. Here are some of the arguments for and against:
Against PSA Screenings
In Favor of PSA Screenings
Recommended General Guide to PSA Testing
Summary of Genomic Prostate Cancer Tests (Beyond PSA):
Initial basic screening would include Total PSA, Free, and Total PSA and PSA Density levels.
Improved pre-biopsy screening tests would include PHI, Mi-Prostate Score, ExoDx (EPI), the "4K test" and SelectMDx.
A patient with a negative initial tissue biopsy being considered for a repeat prostatic biopsy can best be further analyzed and risk-stratified by ConfirmMDx, the "4K" test or PCA3.
Patients with low grade or intermediate grade disease being considered for either active surveillance or definitive therapy would benefit most from either Oncotype Dx or Promark.
Men on active surveillance can be tracked and followed with Prolaris or serial PCA3 testing in addition to standard PSA levels.
Patients who are post radiation therapy or who were diagnosed with prostate cancer after TURP surgery can be tracked with Prolaris.
Overall prognosis, cancer-specific survival and risk of metastases is best assessed in post-radical prostatectomy patients with Decipher.
Prostate cancer diagnosis and treatment can be complex and is often controversial. Contributing factors include:
These and many more issues continue to challenge clinicians who deal with prostate cancer patients and men at risk for this common, potentially lethal male malignancy.