Possible association of etanercept, venous thrombosis, and induction of antiphospholipid syndrome.

Tumor necrosis factor α (TNF α ) inhibitors are commonly used for treatment of aggressive rheumatoid arthritis and other rheumatic diseases. Etanercept is one of the medications approved for treatment of rheumatoid arthritis. Though many studies have documented the safety and efficacy of these medications, evidence for adverse effects is emerging including cancer, infections, and cardiovascular disease.