Anti-TNF-α-induced lupus syndrome : Two case reports and review of current literature.

Anti-tumor necrosis factor‑α (TNF-α)-induced lupus (ATIL) represents a diagnostic and treatment challenge. Most cases are caused by infliximab and in some cases by etanercept and adalimumab. Symptoms can range from cutaneous manifestations to more rare and serious conditions. Diagnosis requires a temporal relationship between symptoms and positive autoantibody determination. Arthritis and cutaneous symptoms are the most common manifestations accompanied by positive antinuclear antibody (ANA) and anti-double strand DNA (dsDNA) determinations. The etiology of ATILS remains to be definitively established. Several mechanisms have been proposed for anti-TNF-α-induced lupus, including apoptosis, immunosuppression and humoral autoimmunity. Treatment includes discontinuation of anti-TNF‑α agents and in some cases corticosteroids and immunosuppressors. Questions to be answered: (1) Are soluble TNF receptor fusion proteins such as etanercept and anti-TNF chimeric antibodies equally likely to cause ATIL? (2) Can patients with ATIL switch from one anti-TNF‑α antagonist to another? (3) Can the concurrent use of a conventional synthetic disease-modifying antirheumatic drug (csDMARD) like methotrexate or hydroxychloroquine reduce the probability of ATIL?