Etanercept is a biologic TNF inhibitor commonly used to control ankylosing spondylitis, juvenile idiopathic arthritis, plaque psoriasis, psoriatic arthritis, and rheumatoid arthritis. Etanercept is a soluble receptor that binds both TNF-alpha and TNF-beta to inhibit the inflammatory response in joints and skin that is characteristic of these autoimmune disorders. The drug can be used as a monotherapy or taken with other immunosuppressants, such as methotrexate.
Off-label uses (not FDA approved):
Etanercept is a biologic tumor necrosis factor (TNF) inhibitor; the drug acts as a soluble TNF receptor and binds TNF-alpha and TNF-beta. TNF is a cytokine that can bind to TNF receptor 1 (TNFR1) or TNF receptor 2 (TNFR2) and is involved in inflammation and the immune response. When TNF binds to TNFR1 or TNFR2, it activates important inflammatory pathways, such as NFkB and MAPK. The structure of Etanercept consists of two p75 TNF receptors fused to the Fc portion of human IgG. Etanercept works by blocking the effects of TNF-alpha, a pro-inflammatory cytokine that becomes elevated in psoriasis, rheumatoid arthritis, psoriatic arthritis, juvenile idiopathic arthritis, and ankylosing spondylitis.
Etanercept administration is via subcutaneous injection, usually on the thigh, lower abdomen, or upper arm. If given on the abdomen, the injection should not be within the 2-inch area around the navel. Injections should be administered at least 1 inch away from previous injection sites. The medication comes in a pre-filled syringe, automatic injection device, or multiple-dose vial. After the initial injection of Etanercept at the doctor’s office, the patient can self-inject at home.
For the treatment of rheumatoid arthritis, psoriatic arthritis, and ankylosing spondylitis, 50 mg of etanercept is injected once a week. For psoriasis, the dosage is 50 mg twice weekly for 3 months, followed by 50 mg once weekly. Children with juvenile idiopathic arthritis are administered 0.8 mg/kg once a week, up to 50 mg.
The most common adverse effects include:
Rare adverse effects include (in alphabetical order):
US boxed warnings
Infections, including tuberculosis:
Patients using etanercept have an increased risk of acquiring serious and/or fatal infections, including the development of active tuberculosis or reactivation of latent tuberculosis. There are reports of various bacterial, viral, and fungal infections, including invasive fungal (aspergillosis, blastomycosis, candidiasis, coccidioidomycosis, histoplasmosis, and pneumocystosis) and opportunistic infections (legionellosis, listeriosis).
Infections were more common in patients that received adjunct immunosuppressive medications, such as methotrexate or corticosteroids. Medical providers should exercise caution when prescribing etanercept to patients at higher risk for infections, including elderly patients, immunocompromised patients, patients with a history of recurrent/chronic/opportunistic infections, and patients exposed to tuberculosis or endemic mycoses. Physicians should consider empiric antifungal therapy for patients living in or traveling to endemic areas with an increased risk of invasive fungal infections.
Reports exist of malignancies in patients receiving etanercept, especially in children and adolescents. Lymphomas were most commonly reported, followed by melanoma and other skin cancers. Though the connection between etanercept and malignancies is not fully understood, clinical trials and case reports showed an increased rate of lymphoma and other malignancies in patients on etanercept compared to the general population. However, it is worth noting that rheumatoid arthritis alone has associations with increased rates of lymphoma and leukemia.
Etanercept contraindications include patients with sepsis. Patients should not start etanercept during active bacterial infections, including tuberculosis (active or latent), active herpes zoster infection, active or chronic untreated Hepatitis B or C infection, or active invasive fungal infections. Patients should not use etanercept if they have a hypersensitivity reaction to the medication ingredients.
Before starting etanercept, patients should receive screening for any infections, including latent tuberculosis or hepatitis B. Patients on etanercept require monitoring for signs of infection and reactivation or development of tuberculosis and hepatitis B. If a severe infection or sepsis develops during etanercept treatment, discontinue treatment. Also, patients should have monitoring for signs or symptoms of hypersensitivity reactions, malignancy, or lupus-like syndrome. Patients with a history of heart failure also require monitoring during etanercept treatment.
There have not been any dose-limiting toxicities observed during clinical trials, in vivo, and in vitro studies. However, the long-term toxicity of etanercept treatment is unknown.
Etanercept is one of several different options for the treatment of plaque psoriasis, rheumatoid arthritis, psoriatic arthritis, juvenile idiopathic arthritis, and ankylosing spondylitis. The medical providers should weigh the risks and benefits of selecting etanercept as a treatment, such as cost, effectiveness, method of administration, and adverse effects. Because it is a biologic, etanercept usage comes with some serious side effects such as infections, malignancies, and autoimmune conditions.
It is important that an interprofessional team of physicians, nurses, and pharmacists work together to ensure the safety and wellbeing of the patient. When deciding to treat with etanercept, physicians should know the treatment guidelines, which include monitoring the patient for signs of heart failure, tuberculosis, hepatitis B, and other infections before and during treatment. Physicians and nurses will instruct the patient or the patient’s relative on how to properly give etanercept injections at home. Physicians and pharmacists must ensure that the patient is receiving the proper medication and dosage and that the patient receives on drug interactions and adverse effects. Nursing should keep the team informed regarding the appearance of these adverse reactions, as well as monitoring the success of therapy. In addition, biosimilars of etanercept have been emerging on the market, so healthcare providers need to be kept abreast on the different options that they have for treatment. Without proper management, the quality of life in patients with these diseases is low. An interprofessional healthcare team can help achieve the best possible outcomes. [Level V]
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