CIRT and CANTOS highlight two types of inflammation
No significant differences in major adverse cardiovascular events (MACE) emerged between methotrexate and hydroxychloroquine (HCQ) treatment in a comparison of adults 65 years or older with rheumatoid arthritis. However, researchers reported some elevation in risk for stroke in the methotrexate group and for myocardial infarction and heart failure in the HCQ group.
Dr. Seoyoung Kim
The primary outcome, a composite of MI, stroke, or cardiovascular death, had an incidence of 23.39 per 1,000 person-years in the methotrexate group versus 24.33 in the HCQ group in this observational study of nearly 60,000 people.
“These results suggest an importance of looking at different individual events of cardiovascular disease rather than the whole ‘CV’ disease only,” Seoyoung Kim, MD, said in an interview. “The other important thing is that the mortality was not significantly different between the two groups.”
For example, the researchers reported 256 cardiovascular-related deaths in the methotrexate group and 263 such deaths in the HCQ cohort.
Addressing a recognized risk
“It is well known that patients with rheumatoid arthritis have excessive morbidity and mortality,” Dr. Kim, of the division of rheumatology at Brigham and Women’s Hospital and associate professor of medicine at Harvard Medical School in Boston, said at the virtual annual meeting of the American College of Rheumatology.
Among prior studies in this area, the Cardiovascular Inflammation Reduction Trial (CIRT) found no significant reduction in cardiovascular events among people taking methotrexate versus placebo. However, the study of 4,786 people was not specific to RA, Dr. Kim said. The lack of efficacy on this endpoint prompted researchers to stop CIRT early.
“So what does the conclusion of the CIRT trial mean for rheumatoid arthritis patients?” Dr. Kim asked.
To find out, she and colleagues compared risk of MACE among participants newly starting either methotrexate or HCQ. The study included 59,329 people aged 65 and older who were identified through Medicare claims data from 2008 to 2016. Mean age was 74 years, and 80% were women.
The investigators used propensity score matching to control for multiple covariates for demographics, other medications, and comorbidities. Use of other medications was similar between groups, including glucocorticoids, NSAIDs, and statins. Baseline cardiovascular morbidities likewise were well balanced, Dr. Kim said.
The hazard ratio for the primary MACE outcome was 0.96 (95% confidence interval, 0.86-1.08).
Secondary outcomes
MI was less common in the methotrexate group, for example, with an incidence of 8.49 per 1,000 person-years versus 10.68 per 1,000 person-years in the HCQ cohort. This finding was statically significant, Dr. Kim said, with a hazard ratio of 0.80 favoring methotrexate.
Heart failure also occurred less often in the methotrexate cohort, with an incidence rate of 8.57 per 1,000 person-years versus a rate of 14.24 in the HCQ group. The hazard ratio again favored methotrexate at 0.60.
In contrast, strokes were more common with methotrexate than with (incidence of 7.94 vs. 6.01 per 1,000 person-years).
Another secondary outcome, all-cause mortality, was not significantly different between groups. There were 821 deaths in the methotrexate group (28.65 per 1,000 person-years) and 796 deaths in the HCQ group (31.33 per 1,000 person-years).