Objective. To determine whether the initiation of corticosteroids or other types of therapy affects the development of scleroderma renal crisis (SRC).Methods. Using a case-control study, 110 patients with systemic sclerosis who developed SRC between 1981 and 1993 were closely matched with controls on sex, race, age, disease duration, skin score, levels of creatine phosphokinase, and presence of tendon friction rubs. Corticosteroid use was determined prior to the onset of SRC in cases or prior to the first visit in controls. Cases were compared with matched controls using McNemar's matched-pair analysis and conditional logistic regression analysis. The effects of other drugs, including D-penicillamine, nonsteroidal antiinflammatory drugs (NSAIDs), calcium channel blockers, and angiotensin-converting enzyme (ACE) inhibitors, were also evaluated.Results. In the 6 months prior to SRC onset or to the first visit, high-dose corticosteroids (215 mg/day prednisone or equivalent) were administered significantly more frequently in SRC patients (36%) than in the controls (12%) (McNemar's odds ratio 4.37, 95% confidence interval 2.03-9.43, P < 0.0001). New use of low-dose steroids, continuous use of any steroid dose, NSAIDs, calcium channel blockers, and ACE inhibitors were not associated with an increased risk of SRC. Antecedent D-penicillamine therapy may have been protective against the development of SRC in controls.Conclusion. This retrospective case-control study has shown a significant association between antecedent high-dose corticosteroid therapy and the development of SRC. These results should discourage the use of highdose corticosteroids in patients with early diffuse scleroderma who are at increased risk of developing SRC.Scleroderma renal crisis (SRC) has been considered one of the most severe complications of systemic sclerosis. Although early treatment with angiotensinconverting enzyme (ACE) inhibitors has dramatically improved the outcome in patients with this complication, not all patients escape death or permanent dialysis (1). Predictors of renal crisis include early disease, diffuse cutaneous involvement, rapid progression of skin thickening (2), and possibly, anti-RNA polymerase I11 antibody (3). Anecdotal comments and a few case reports (4,5) have suggested that corticosteroids are associated with the development of renal crisis. However, patients who have early scleroderma with prorninent inflammatory features are precisely those who are most likely to receive steroids. The purpose of the present study was to determine whether corticosteroids are independently associated with renal crisis by controlling for the above-mentioned factors. It has been reported that D-penicillamine may prevent renal crisis (6) and ACE inhibitors may also be potentially prophylactic. Therefore, the effects of these drugs were also studied.