Concerns about abatacept (Orencia)-related lung disease in patients with rheumatoid arthritis appear to be unfounded, a large U.S. database review has determined.
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Safety signals seen in a small subset of patients in the 2006 ASSURE study likely arose from chance, Samy Suissa, PhD, and his colleagues wrote in Seminars in Arthritis & Rheumatism. Patients in that study with preexisting chronic obstructive pulmonary disease (COPD) were 84% more likely to develop an exacerbation or other lung disorder than were those taking a placebo comparator.
The new database study contradicted that finding.
“Our study suggests that these numerical differences in ASSURE are expected results of random variation and thus compatible with chance,” Dr. Suissa of Jewish General Hospital and McGill University, both in Montreal, and his coauthors wrote. “Moreover, our findings are consistent with two studies of the safety of abatacept in the context of interstitial lung disease, albeit a different respiratory disease than COPD.”
The year-long ASSURE trial reported on the safety of abatacept in 959 patients versus 482 assigned to placebo. The safety signal arose in a subgroup of 54 patients with COPD, 37 of whom were assigned to abatacept and 17 to placebo. Among these were four serious respiratory adverse events (COPD exacerbation, worsening of COPD, bronchitis, and pneumonia) in four patients taking abatacept and none in the placebo arm.
“It is useful to note that this difference of 11% versus 0% rate is compatible with chance [exact P = .31], while the exact 95% confidence interval for the odds ratio is wide and includes unity ... The trial also reported more mild-moderate respiratory events with abatacept than with placebo [43.2% vs. 23.5%], including cough, rhonchi, COPD exacerbation, COPD, dyspnea, and nasal congestion. This difference resulted in an odds ration of 1.84,” with a wide confidence interval that included unity (0.48-8.63).
Nevertheless, these findings led to the addition of a warning in the prescribing insert: “Adult COPD patients treated with Orencia developed adverse events more frequently than those treated with placebo, including COPD exacerbations, cough, rhonchi, and dyspnea. Use of Orencia in patients with RA and COPD should be undertaken with caution and such patients should be monitored for worsening of their respiratory status.”
Dr. Suissa’s team used the U.S. MarketScan prescribing database to asses the risk of respiratory adverse events associated with abatacept, compared with other biologic disease-modifying antirheumatic drugs (DMARDs) in a real-world setting.
The cohort comprised 1,807 patients with rheumatoid arthritis and COPD who started a new prescription for abatacept, matched in time to 3,547 who initiated another biologic DMARD. The primary endpoint was the combined risk of hospitalization for COPD exacerbation, bronchitis, and hospitalized pneumonia or influenza.
The most common comparator biologic DMARDs were etanercept, adalimumab, rituximab, and infliximab.
For patients with COPD and comparator patients, the incidence rates for COPD exacerbation were 1.2 per 100 person-years with abatacept and 2.1 per 100 person-years with a different biologic DMARD; for bronchitis, the respective rates were 4.2 and 5.3; for hospitalized pneumonia or influenza, 3.6 and 2.6; and for outpatient pneumonia or flu, 14.7 and 14.4. For the combined endpoint, the incidence rate was 8.7 per 100 person-years with abatacept and 9.9 per 100 person-years with other biologic DMARDs.
The adjusted hazard ratio of the combined endpoint with abatacept versus that with other biologic DMARDs was a nonsignificant risk of 0.87. The hazard ratio with abatacept was 0.60 for hospitalized COPD; 0.80 for bronchitis; 1.39 for hospitalized pneumonia and flu; and 1.05 for outpatient pneumonia and flu. None of these associations was statistically significant.
“One exception was the risk of hospitalization for pneumonia or influenza, which was higher with abatacept among patients with more severe COPD,” at 6.99, than it was with other biologic DMARDs, the authors noted.
Dr. Suissa disclosed relationships with AstraZeneca, Bayer, Boehringer Ingelheim, Bristol-Myers Squibb, and Novartis.
SOURCE: Suissa S et al. Semin Arthritis Rheum. 2019 Mar 16. doi: 10.1016j.semarthrit.2019.03.007.