Overall survival in patients with rheumatoid arthritis and solid malignancies receiving biologic disease-modifying antirheumatic therapy

Introduction/objectives: The effects of biologic disease-modifying antirheumatic drugs (bDMARDs) in patients with rheumatoid arthritis (RA) and cancer are largely unknown. We examined overall survival (OS) in patients with RA and solid malignancies receiving bDMARDs.

Methods: We performed a retrospective cohort study of patients with RA and solid malignancies seen at MD Anderson Cancer Center between 2002 and 2014. Cox proportional hazard regression models, stratified by tumor type and stage, were fit evaluating use of bDMARDs as a time fixed and time varying covariate.

Results: We identified 431 RA patients with solid malignancies: 111 (26%) received bDMARDs after their cancer diagnosis. Median OS from cancer diagnosis was 16.1 years. Of the patients receiving bDMARDs, most had localized disease, and only 14 (13%) had advanced cancer. In the stratified Cox models no statistically significant differences were observed between patients who received tumor necrosis factor inhibitors (TNFi) or patients who received nonTNFi, compared with those who did not receive bDMARDs (hazard ratio (HR), 0.67; 95% confidence interval (CI), 0.31, 1.44; HR, 1.10; 95% CI, 0.26, 4.60 respectively). In breast cancer patients, those receiving TNFi or nonTNFi had a numerically higher but statistically nonsignificant HR compared with those who did not receive bDMARD: HR, 1.40 (95% CI, 0.42, 4.73), and HR, 1.37 (95% CI, 0.22, 8.42) respectively.

Conclusion: No significant differences in OS were observed between patients who received bDMARDs and those who did not. Additional data is needed to evaluate other cancer outcomes such as recurrence and progression, and patients with advanced cancer. Key Points •We found no statistically significant differences in OS between patients with RA and concomitant solid malignancies who received bDMARDs and those who did not. •Most patients who received bDMARDs had been diagnosed with early stage cancer •As few patients with advanced cancer received bDMARDs safety for this group cannot be established •No significant differences were observed between TNFi and nonTNFi, but the sample size was small.

Keywords: Biologic; Cancer; DMARD; Rheumatoid arthritis; Tumor necrosis factor.