Safety of Estrogens in Lupus: Birth Control Pills

This study tests the effect of exogenous female hormones on disease activity and severity in women with systemic lupus erythematosus (SLE). Physicians generally do not prescribe oral contraceptives (OCs) to women with lupus because of the widely held view that these drugs can activate SLE. This practice is based on the greater incidence of SLE in women than in men, biologic abnormalities of estrogen metabolism, murine models of lupus, several anecdotes of patients having disease flares while receiving exogenous hormones, and a single retrospective study in patients with preexisting renal disease. By contrast, recent retrospective studies suggest that the rate of flare is not significantly increased in patients taking OCs. The preexisting data is insufficient to warrant the dismissal of a potentially important birth control option in a disease that predominantly affects women in their reproductive years and whose fertility is not altered by the disease. Moreover, the use of OCs to preserve fertility in patients taking cyclophosphamide and the use of estrogens to prevent coronary artery disease and postmenopausal and steroid-induced osteoporosis are timely considerations. We will attempt to define, in a multicenter, randomized, double-blind, placebo-controlled trial, the effect of OCs containing low-dose synthetic estrogens and progestins on disease activity in women with SLE. Because the research hypothesis is that OCs do not increase the risk of flares, we have designed the study to be able to detect minimal increases in the rate of flares in patients taking OCs. We will enroll patients with inactive, stable, or moderate disease requiring less than 0.5 mg prednisone per kg of bodyweight per day over a 2-year period and randomize them to receive birth control pills or placebo pills for 12 months. During that time, the patient must use condoms or a diaphragm as birth control. We will recruit patients from clinics and private practices that include over 4,000 women with SLE, most belonging to minority groups.