Adenocarcinoma is a malignant neoplasm arising from epithelial cells of the glands or glandular like structures. Adenocarcinoma can arise in multiple sites of the body. Some of the common sites that develop adenocarcinoma are the breast, lung, prostate, gastrointestinal tract like the colon, rectum, pancreas, stomach, esophagus. Adenocarcinomas also make 70 percent of cancer of unknown origin.
A number of environmental as well as lifestyle risk factors are associated with the development of cancers. Different sites have different carcinogens and risk factors. Tobacco smoking, by far, seems to play a major role in most of them.
Adenocarcinoma of Lung
Smoking is a significant risk factor associated with lung cancer with more than 90 percent of cases related to it. Other risk factors include exposure to radiation, environmental toxins like arsenic, chromium, nickel, polycarbonate, pulmonary fibrosis, scarring of the lung, and genetic causes.
Adenocarcinoma of Breast
Breast cancer is the most common cancer diagnosis in the world and in the United States. Female gender, excess estrogen exposure states like nulliparity, late pregnancy, early menarche, late menopause, external estrogen exposure, alcohol are some of the risk factors for breast cancer. Genetic factors with mutations in the BRCA1/2, p53, PTEN, PALB2, etc, and family history increase the risk of breast adenocarcinoma.
Adenocarcinoma of Prostate
The most important risk factor for prostate adenocarcinoma is age. Patients clinically diagnosed with prostate cancer before age 40 is very rare. Other risk factors include cigarette smoking, family history of prostate cancer as well as germline mutations like BRCA2/1 and ATM.
Adenocarcinoma of the Colon/Rectum
Environmental and genetic factors increase the risk of colorectal cancer. Many hereditary colorectal cancer syndromes like the familial adenomatous polyposis, Lynch syndrome, and other non-Lynch syndromes like the biallelic MUTYH, BRCA1/2, PALB2, CDKN2A, TP53, FAP increases the risk of colorectal cancer. Other risk factors include personal or family history, inflammatory bowel disease, red and processed meat, tobacco use, and alcohol also increase the risk.
Adenocarcinoma of the Pancreas
Environmental risk factors contributing to pancreatic adenocarcinoma include smoking, high fasting plasma glucose, high body mass index, western diet, coffee and alcohol consumption, prolonged use of aspirin. Hereditary risk factors also contribute to the risk with up to 10 percent of the individuals with pancreatic cancer have a family history. ABO blood type has been associated with several gastrointestinal cancers including pancreatic cancer, as well as cystic fibrosis with 2 to 5 fold higher risk in patients who have undergone a lung transplant. The amount of cigarette smoking significantly increases
Adenocarcinoma of Lung
Lung cancer is the most common cause of cancer and the leading cause of death in men in the world and the second leading cause in women. Forty percent of lung cancers are secondary to adenocarcinoma. There are significant differences in the incidence of lung cancer from one country to another, mostly attributed to the prevalence of smoking. The tobacco control efforts are going to reduce the incidence of lung cancer in the future.
Adenocarcinoma of Breast
Breast Cancer is the second most common cause of cancer worldwide and the most common cancer in women. The incidence of breast cancer is more in the Caucasian countries compared to the Asian and African nations. Breast cancer mortality has been in decline largely attributed to the screening measures and adjuvant therapy.
Adenocarcinoma of Prostate
Adenocarcinoma of the Prostate is the second most common cancer in men worldwide. It is the third leading cause of death in the United States. Prostate cancer mortality is on a decline especially in the United States which is attributed to increased screening as well as adjuvant therapies.
Adenocarcinoma of Colon/Rectum
Colorectal cancers are the third most common cancer in males and second in females. In the United States, the annual incidence, as well as mortality, is slowly decreasing. The incidence of colorectal cancers varies globally with the highest incidence rates in Australia, New Zealand, Europe, and North America, whereas the lowest seen in Africa and Southcentral Asia. People with low socioeconomic status also tend to have an increase in the incidence of colorectal cancer.
Adenocarcinoma of Pancreas
Pancreatic cancer is the fourth leading cause of oncologic related death in both men and women. More than 85% of the cases comprise of adenocarcinoma. Incidence increases with age and is rare before the age of 45. It peaks at age 65-69 in men and age 75 to 79 in women. It has been mostly reported in the western world, with the highest incidence in high-income groups living in North America, Western and Central Europe. The lowest incidence reported in South Asia and Central and Eastern Sub Saharan Africa. In the United states incidence seems to be higher in males and predominantly seen in African Americans.
Adenocarcinomas are easily diagnosed and distinguished from other cancer histologies by a light microscopy examination. The diagnosis is usually based on the identification of glandular structures under the light microscopy. As these features are shared by all types of adenocarcinomas, it is impossible to diagnose the primary site of origin of these tumors, especially in a metastatic setting. Also, with poorly differentiated adenocarcinomas, where the minimal glandular formation is seen on light microscopy or no glandular formation but stain for mucin, immunohistochemistry (IHC) is an important tool to help further diagnose the type of adenocarcinoma.
The clinical presentation of patients with adenocarcinoma will vary according to the primary site of involvement by the tumor and the extent of other organs involved. Obtaining a family history from the patient plays a significant role as some of the cancers are inherited. Patients can be asymptomatic or have nonspecific symptoms like unintended weight loss and other symptoms depending on the organ involvement with metastasis. The most commonly involved sites include the bones, lungs, liver, and lymph nodes which represent nearly 60 percent of the cases. The most common type of adenocarcinomas comprises breast, lung, prostate, colorectal, and pancreatic.
Adenocarcinoma of the breast may present with common symptoms like sudden onset of pain or after trauma, nipple discharge/inversion, new persistent skin changes, palpable breast mass which could be found as an incidental finding or at a routine wellness exam.
Adenocarcinoma of the lung can present with a chronic dry cough, dyspnea, hemoptysis, weight loss, or as an incidental finding on routine imaging. Lung adenocarcinoma is associated with extrapulmonary features like hypertrophic osteoarthropathy, which manifests as clubbing, periostitis of long bones, and arthritis.
Adenocarcinoma of prostate patients may present with difficulty urination, weak stream, incomplete emptying of the bladder, occasionally hematuria, chronic back pain. On exam enlarged prostate, abnormal DRE exam, although this has low sensitivity and specificity.
Adenocarcinoma of the colon and rectum can present as unintentional weight loss, fatigue, generalized weakness, hematochezia, abdominal pain, bowel obstruction.
Adenocarcinoma of the pancreas can present as chronic epigastric pain, nausea, vomiting, jaundice, weight loss, anorexia, asthenia, steatorrhea, hepatosplenomegaly, thrombophlebitis.
Initial evaluation for a diagnosis of adenocarcinoma starts with a thorough complete history and a physical exam. Lab work should include complete blood counts, comprehensive metabolic panel, and urinalysis. Imaging studies are usually obtained depending on the suspicion of the primary site of adenocarcinoma as well as metastatic disease.
Computed tomography (CT) scan of the chest, abdomen, and pelvis with contrast and in some instances magnetic resonance imaging (MRI) are usually helpful in evaluation for a primary site of cancer. Gender-specific screening, for example, prostate exam as well as levels of PSA levels in a patient suspicious for prostatic adenocarcinoma and a complete breast and pelvis exam including a pap smear and mammogram in females suspicious for breast cancer. Positron emission tomography (PET) scan can be helpful in identifying a primary site in 40 percent of the cases in a retrospective study and is also used for appropriate staging. However, the use of PET scans was not found to be superior to CT scans in a prospective study.
Patients with concern for a gastrointestinal tumor should be evaluated with a colonoscopy, upper endoscopy with endoscopic ultrasound (EUS), and endoscopic retrograde cholangiopancreatography(ERCP) depending on the suspicion for the origin of the primary tumor. Colonoscopy is also recommended for a colorectal origin tumor when an intra-abdominal metastasis has CK20/ CK7 negative on the IHC staining pattern. Once a biopsy is obtained, further microscopic examination, as well as IHC staining, will help accurately diagnose the type of adenocarcinoma.
Biomarkers like the CEA, CA 19-9, CA 125, etc are not sensitive for diagnostic purposes but can be used to monitor response to therapy as well as an indicator of the activity of disease at the time of diagnosis. CA 15-3 and CA 27.29 are commonly used in metastatic breast cancer to monitor disease status for patients undergoing treatment.
Adenocarcinomas are diverse and can involve any part of the body. The management and treatment of adenocarcinoma differ depending on the primary site of disease as well as the stage of cancer. Prior to the initiation of any treatment, it is very important to first characterize the site and type of adenocarcinoma. Multidisciplinary care is of utmost importance with the involvement of pathology, radiology, surgical oncology, radiation oncology, and medical oncology along with the other allied health professionals. The earlier stages of cancer, where surgical resection is feasible, surgery offers the best opportunity for long term survival. Depending on the location, type, stage, as well as the performance status of the patient, different types of treatments, are proposed.
Curative intent treatments usually include surgery, neoadjuvant or adjuvant systemic chemotherapy, radiation therapy, or a combination of concurrent radiation and chemotherapy, hormonal therapy in breast and prostate cancer. Management also involves close follow up of these patients with repeat blood work, surveillance scans, and long term symptom and survivorship care. The palliative treatment is proposed in the incurable setting and usually involves systemic chemotherapy, immunotherapy, targeted therapies to prolong the survival of the patient. There is a role for palliative radiation and surgery for symptom control.
Differential diagnosis can be broad depending on the site of adenocarcinoma.
The prognosis of adenocarcinoma depends on the type of adenocarcinoma as well as the stage of cancer at diagnosis. The tumor, node, metastasis (TNM) staging by far has the greatest impact on prognosis. Other independent factors that determine prognosis are the performance status of the patient, site of metastasis, tumor burden, eligibility, and tolerance of treatment.
Below are the SEER data on survival on different sites of adenocarcinoma, where a significant survival difference is noted between different adenocarcinoma depending on the site of origin.
Complications of adenocarcinoma primarily are related to the cancer site, the extent of the tumor, metastatic area. Other complications associated with adenocarcinoma are related to the management options.
Patient education should be considered an important aspect when it comes to better management of any disease. In the context of adenocarcinoma, patient education regarding the importance of recognition of any concerning symptoms is of utmost importance. Any clinician needs to maintain a good doctor-patient relationship, which will allow them to covey their concerns freely.
The patient should receive education regarding:
Adenocarcinoma is a common diagnosis and the management of these invasive cancers is complex depending on the primary site, stage of cancer, performance status of the patient. Various healthcare providers are involved in the management of adenocarcinoma including pathologists, surgical oncologists, radiation oncologists, medical oncologists, primary care physicians, radiologists, nurses, and pharmacists.
Effective management of the disease requires excellent interpersonal communication and collaboration between team members for providing improved patient-centered care. An interdisciplinary tumor board discussion is recommended in the management of these patients which helps with effective communication, timely treatment planning, and good outcomes. Involving the patients and their families in treatment decisions are improves outcomes in these patient populations. Most importantly, screening and management guidelines exist as a result of various conferences and exhaustive research (clinical trials, meta-analysis, systematic reviews) where health care providers come and work together towards common goals and share their ideas.
Revision of guidelines is critical to incorporate better, practical, and more feasible methods. In situations where enough data isn't available, expert opinion from a specialist may be taken to help better guide management. All this is possible with effective communication and coordination of care amongst different health care providers.
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