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Adalimumab (Humira; manufactured in the United States by AbbVie Inc.) is a recombinant human IgG1 monoclonal antibody that blocks the interaction between tumor necrosis factor α (TNF-α) and both its soluble and membrane-bound receptors. TNF-α is a proinﬂammatory cytokine and is a vital intermediary of the body’s normal inﬂammatory response. It can, however, lead to excess inﬂammation and tissue damage at high concentrations.
- 1 Overview
- 2 Role of Tumor Necrosis Factor α (TNF-α)
- 3 Mechanism of action of Adalimumab
- 4 Indications and Uses
- 5 Administration and Dosing
- 6 Safety
- 7 References
Uveitis refers to the presence of intraocular inﬂammation involving the vascular coat of the eye (the uvea), that is, the iris and ciliary body anteriorly and the choroid posteriorly.In the past, corticosteroids and methotrexate were used to treat uveitis; however, newer biologic agents such as adalimumab have transformed therapy for noninfectious uveitis. The Standardization of Uveitis Nomenclature (SUN) Working Group proposed classifying uveitis using an anatomic classification based on the site of inﬂammation. They also created a grading system based on the number of anterior chamber cells and ﬂare. SUN also classified uveitis based on the onset (sudden or insidious), duration (limited or persistent), and course (acute, recurrent, or chronic).
Role of Tumor Necrosis Factor α (TNF-α)
TNF-α is a proinﬂammatory cytokine. It can be secreted by both immune (most commonly macrophages and lymphocytes) and non-immune cells. It is a key molecule responsible for the body’s normal inﬂammatory response. Both the forms, that is, the membrane-bound and the soluble TNF-α are biologically active and can interact with one of two receptors: TNFR1 (p55, CD120a) and TNFR2 (p75, CD120b), causing its various effects. The most prominent effect of binding to the TNF receptors includes initiation of a pro-inﬂammatory cascade through the rapid induction of cytokines and can subsequently lead to tissue damage and destruction.
Mechanism of action of Adalimumab
Adalimumab is a recombinant human IgG1 monoclonal antibody specific for human TNF-α. It has human-derived heavy and light chain variable regions and human IgG1κ constant regions. It is produced in mammalian cells using the recombinant DNA technology. It has a molecular weight of 148 kDa and is composed of 1,330 amino acids. It predominantly acts through two mechanisms of action. First, it binds specifically to TNF-α and blocks its interaction with the p55 and p75 cell surface TNF receptors, and second, it causes lysis of cells with surface TNF in the presence of complement.
Indications and Uses
Adalimumab was first approved by the US FDA in 2002 for use in patients with rheumatoid arthritis (RA). Other FDA approved indications for adalimumab include treatment for RA, juvenile idiopathic arthritis (JIA), psoriatic arthritis, ankylosing spondylitis, adult and pediatric Crohn’s disease, ulcerative colitis, plaque psoriasis, and hidradenitis suppurativa. It was approved for the treatment of adults with intermediate, posterior, and panuveitis in June 2016.
The most common cause of pediatric uveitis is JIA. It most commonly affects the anterior chamber, is bilateral and is chronic in the majority of cases. In 2012, Simonini et al published a systematic review and meta-analysis on anti-TNF therapy in childhood chronic uveitis including five papers that found a pooled response rate of 87% for improving intraocular inﬂammation. One open-label, prospective trial for refractory non-infectious childhood uveitis compared the ability of adalimumab and inﬂiximab to maintain remission. This study found that adalimumab had a higher probability of maintaining remission when compared to low-dose inﬂiximab. In a study by National Italian Registry, they assessed the safety and efficacy of adalimumab and inﬂiximab in patients with refractory uveitis secondary to JIA and found that the remission rates were better in the patients treated with adalimumab.The American Academy of Ophthalmology (AAO) recommends the use of methotrexate as the first line agent followed by adalimumab as the second-line treatment for JIA-associated uveitis.
Behçets can affect any part of the uveal tissue. It causes a relapsing-remitting type of uveitis. Most patients present with bilateral disease, and panuveitis is the most common manifestation. AAO strongly favors treatment with anti-TNF therapy with inﬂiximab or adalimumab as first- or second-line corticosteroid-sparing agents for patients with ophthalmic manifestations of Behçets. In a 2010 literature review by Arida et al, found adalimumab to be effective in all patients with ocular involvement from Behçets. In a large multicenter retrospective study published in 2015 by Vallet et al, they documented that adalimumab was highly effective in treating severe or refractory Behçets.
Sarcoidosis is a multisystem inﬂammatory disorder that affects eyes in 10%–80% of cases. Uveitis is the most common ocular manifestation. In a study by Erckens et al, 26 patients with sarcoidosis and refractory posterior uveitis were treated with adalimumab 40 mg SC weekly. The authors found it to be highly effective.
The seronegative spondyloarthropathies are a diverse group of inﬂammatory diseases that affect the axial skeleton. The most common association is seen with psoriatic arthritis, inﬂammatory bowel disease, reactive arthritis, and ankylosing spondylitis. A multinational, open-label clinical trial by Rudwaleit et al, evaluated adalimumab for the treatment of uveitis in 1,250 patients with active ankylosing spondylitis and found that treatment decreased the overall ﬂare rate by 51%. The AAO has strongly recommended that inﬂiximab or adalimumab may be used as a corticosteroid-sparing agent for chronic uveitis resulting from seronegative spondyloarthropathies.
Administration and Dosing
The most commonly used mode of administration is subcutaneous (SC). Once adalimumab is administered subcutaneously, absorption from the tissue to the circulation begins, at which point the drug then distributes to other tissue compartments, binding both soluble and cell-bound TNF-α. Intravitreal administration has also been evaluated in a pilot study. Hamam et al, evaluated the use of intravitreal adalimumab for noninfectious uveitis at a dose of 1.5 mg given at weeks 0 and 2 and every 4 weeks thereafter for a total of 26 weeks, with promising results. The dosage of adalimumab depends on indication and age. In adults, the standard dosage of adalimumab is 40 mg subcutaneous (SC) every other week for RA, psoriatic arthritis, and ankylosing spondylitis. For the treatment of JIA in children aged 2–17 years, the standard dosage for adalimumab ranges from 10 mg SC every other week (10 to <15 kg) to 20 mg every other week (15 to <30 kg) and 40 mg every other week (≥30 kg). For uveitis in children aged below 6 years and adolescents, Simonini et al, suggested a dose of 24 mg/m2 every 2 weeks with a maximum dose of 40 mg. Vasquez-Cobain et al, have used a weekly dosage of adalimumab for pediatric uveitis.
Dosage forms and strengths
- Injection: 40 mg/0.8 mL of HUMIRA is provided by a single-use pen (HUMIRA Pen), containing a 1 mL prefilled glass syringe with a fixed 27 gauge, ½ inch needle and a gray needle cover.
- Injection: 40 mg/0.4 mL of HUMIRA is provided by a single-use pen (HUMIRA Pen), containing a 1 mL prefilled glass syringe with a fixed 29 gauge thin wall, ½ inch needle and a black needle cover.
- Injection: 40 mg/0.8 mL of HUMIRA is provided by a single-use, 1 mL prefilled glass syringe with a fixed 27 gauge, ½ inch needle and a gray needle cover.
- Injection: 40 mg/0.4 mL of HUMIRA is provided by a single-use, 1 mL prefilled glass syringe with a fixed 29 gauge thin wall, ½ inch needle and a black needle cover.
- Injection: 20 mg/0.4 mL of HUMIRA is provided by a single-use, 1 mL prefilled glass syringe with a fixed 27 gauge, ½ inch needle and a gray needle cover.
- Injection: 10 mg/0.2 mL of HUMIRA is provided by a single-use, 1 mL prefilled glass syringe with a fixed 27 gauge, ½ inch needle and a gray needle cover.
Single-Use Institutional Use Vial
- Injection: 40 mg/0.8 mL of HUMIRA is provided by a single-use, glass vial for institutional use only.
- The risk of serious infections is drastically increased in patients on Adalimumab therapy. The serious infections include tuberculosis, bacterial sepsis, invasive fungal infections, and infections due to other opportunistic pathogens.
- It has also been associated with Hepatitis B reactivation.
- Adalimumab increases the risk of malignancies like lymphoma and leukemia.
- Post-marketing cases of hepatosplenic T-cell lymphoma (HSTCL), a rare type of T-cell lymphoma, have been reported in patients treated with TNF blockers.
- Anaphylaxis and angioneurotic edema have been reported.
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- Hamam RN, Barikian AW, Antonios RS, et al. Intravitreal adalimumab in active noninfectious uveitis: a pilot study. Ocul Immunol Inﬂamm. 2016;24:319-26.
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