WASHINGTON – Biologics use by rheumatoid arthritis patients was associated with a 25% reduction in the risk of premature death, compared with patients without exposure to biologics, based on data from a population-based study of more than 4,000 patients. The findings were presented at the annual meeting of the American College of Rheumatology.
Rheumatoid arthritis (RA) is associated with a twofold increase in premature mortality risk, primarily caused by cardiovascular disease, said Dr. Diane Lacaille of the Arthritis Research Centre of Canada, in Vancouver. Previous research suggests that the increased risk is linked to inflammation that affects other organs beyond the RA-affected joints, she said. Biologic agents have shown effectiveness in controlling the inflammation associated with joint damage in RA, but the drugs’ impact on reducing early mortality has not been well studied, Dr. Lacaille said.
Dr. Lacaille and her colleagues reviewed data from the Canadian Ministry of Health to identify all RA cases that used a biologic agent (anti–tumor necrosis factor (anti-TNF), rituximab, anakinra, or abatacept) during follow-up. The study population included 2,156 patients who used biologics and 2,156 controls matched for age, sex, and calendar year. The average age of the patients was 56 years, and 75% were women. The researchers obtained data on all health services used by the study participants – including medications, lab tests, and hospitalizations – between January 1996 and March 2006, with follow-up to March 2010.
"Exposure to biologics was associated with a reduced risk of death, with a hazard ratio of 0.26 [(95% confidence interval, 0.18-0.36), P less than or equal to .0001)], which means that the risk of death in the biologics users was a quarter that of the nonbiologic users," Dr. Lacaille said. Approximately 90% of the biologics users were using anti-TNF therapy, but the findings were consistent for all biologics in a multivariate analysis, she noted.
Overall, 573 deaths were noted during the study period, including 247 in the biologics group and 326 in the control group. The use of three previous disease-modifying antirheumatic drugs or a change in DMARD did not affect the results, Dr. Lacaille noted.
"I think it wouldn’t be accurate from an epidemiological point of view to say that biologics lead to a 75% reduction" in the risk of premature death, she said.
"But we can be confident that there was an association with a reduction in the reduced risk of death," she added.
The study was limited by the lack of randomization, which may have led to some selection bias, said Dr. Lacaille. But given the increased risk of early mortality associated with RA, the data have "important implications for health policy makers, health care providers, and people with RA," she said.
Approximately 28% of the patients had used more than one biologic, but the number or course of prior biologics had no apparent impact on the risk of death, she added.
Dr. Lacaille had no financial conflicts to disclose.