NEW YORK – Current use of prednisone above 10 mg/day more than doubles the risk of cardiovascular events in patients with systemic lupus erythematosus, according to a study conducted by Dr. Michelle Petri and her colleagues.
"Do everything you can to keep patients with lupus below the 10-mg/day cutoff for prednisone," said Dr. Petri, director of the Lupus Center at Johns Hopkins Hospital, Baltimore. She presented the results of her work at a meeting sponsored by New York University.
In an observational cohort study that explored factors that might increase the risk of cardiovascular events (CVEs) in people with systemic lupus erythematosus (SLE), Dr. Petri analyzed data from 1,874 SLE patients in the Hopkins Lupus Cohort who were seen quarterly at a single clinical center for more than 23 years (April 1987 to June 2010). In patients who took 1-9 mg/day of prednisone, 32 CVEs occurred, which was not significantly different from what would be expected in the general population. But once 10 mg/day was exceeded, the risk of having a CVE increased significantly in the 10- to 19-mg/day prednisone group (relative risk 2.4, P = .002), equivalent to a rate of 20.2/1,000 person-years). A more than a fivefold increase in risk was noted in those who took 20 mg or more per day (P less than .001), which was equivalent to 35.4/1,000 person-years (Am. J. Epidemiol. 2012;176:708-19).
After adjustment for age, CVE rates were not associated with disease duration, but were associated with average past levels of lupus disease activity and recent levels of circulating anti–double-stranded DNA. Past use of corticosteroids in the absence of current use did not affect CVE rates, although a cumulative past dose of 36,500 mg or more (equivalent to 10 or more years of prednisone 10 mg/day or equivalent) more than doubled the CVE rate (P = .0066).
To reduce cardiovascular risk in patients with SLE, Dr. Petri suggested assessing and treating traditional cardiovascular risk factors (hypertension, obesity, hyperlipidemia, smoking, and a sedentary lifestyle). Clinical trials in children and adults have shown that statins do not prevent accelerated atherosclerosis in SLE, so they are not helpful. "They don’t even work in mice!" said Dr. Petri, a professor in the division of rheumatology at Johns Hopkins University School of Medicine, Baltimore.
One possible treatment might be mycophenolate mofetil (MMF), which has not been approved by the Food and Drug Administration for use in SLE. Although there is some evidence that MMF slows progression of atherosclerosis in renal transplant patients and in mice, no clinical studies have been done to support its use in SLE. But Dr. Petri discouraged treating patients with MMF because of warnings associated with its use (infection, lymphoma and malignancies, pregnancy loss and congenital malformations, neutropenia and red cell aplasia, and interference with oral contraceptives).
NSAIDs have also been associated with a 66% increased risk of cardiovascular damage in SLE, Dr. Petri said. "These findings are a driving factor behind our need for new therapies for lupus. We need to avoid steroids as well as NSAIDs."
Dr. Petri is a consultant to GlaxoSmithKline.