Tocilizumab for rheumatoid arthritis: a Cochrane systematic review.
OBJECTIVE
to compare the benefit and safety of tocilizumab to placebo in patients with rheumatoid arthritis (RA).


METHODS
we searched multiple databases for published randomized or controlled clinical trials comparing benefit and safety of tocilizumab to placebo, disease-modifying antirheumatic drugs (DMARD), or other biologics. For dichotomous outcomes, we calculated the relative risk, and for continuous outcomes, the mean difference.


RESULTS
eight randomized controlled trials were included in this systematic review, with 3334 participants, 2233 treated with tocilizumab and 1101 controls. The US and Canadian approved dose of tocilizumab, 8 mg/kg every 4 weeks, was given to 1561 participants. In patients taking concomitant methotrexate, compared to placebo, patients treated with approved dose of tocilizumab were substantially and statistically significantly more likely than placebo to achieve the American College of Rheumatology 50 (absolute percentage, 38.8% vs 9.6%, respectively; RR 3.2, 95% CI 2.7, 3.7); Disease Activity Score remission (30.5% vs 2.7%; RR 8.7, 95% CI 6.3, 11.8); and a clinically meaningful decrease in Health Assessment Questionnaire (HAQ)/Modified HAQ scores (60.5% vs 34%; RR 1.8, 95% CI 1.6, 1.9). There were no substantive statistically significant differences in serious adverse effects (0.8% vs 0.7%; RR 1.2, 95% CI 0.8, 1.6) or withdrawals due to adverse events (4.9% vs 3.7%; RR 1.4, 95% CI 0.9, 2.1); however, tocilizumab-treated patients were significantly more likely to have any adverse event (74% vs 65%; RR 1.05, 95% CI 1.03, 1.07); elevation in the ratio of low-density lipoprotein to high-density lipoprotein cholesterol (HDL; 20% vs 12%; RR 1.7, 95% CI 1.2, 2.2); and increase in the ratio of total to HDL cholesterol (12% vs 7%; RR 1.7, 95% CI 1.2, 2.6); and they were less likely to withdraw from treatment for any reason (8.1% vs 14.9%; RR 0.6, 95% CI 0.5, 0.8).


CONCLUSIONS
at the approved dose of 8 mg/kg every 4 weeks, tocilizumab in combination with methotrexate/DMARD is beneficial in decreasing RA disease activity and improving function. Tocilizumab treatment was associated with a significant increase in cholesterol levels and occurrence of any adverse event, but not serious adverse events. Larger safety studies are needed to address these safety concerns.
Singh
Jasvinder A
JA
University of Alabama at Birmingham, 820 Faculty Office Tower, Room 805B, Birmingham, AL 35294-3708, USA. jasvinder.md@gmail.com
Beg
Saba
S
Lopez-Olivo
Maria Angeles
MA
D000911:Antibodies, Monoclonal / Q000627:therapeutic use*; D061067:Antibodies, Monoclonal, Humanized; D018501:Antirheumatic Agents / Q000627:therapeutic use*; D001172:Arthritis, Rheumatoid / Q000188:drug therapy*; D016208:Databases, Factual; D006801:Humans; D008727:Methotrexate / Q000627:therapeutic use; D010919:Placebos / Q000627:therapeutic use; D016032:Randomized Controlled Trials as Topic; D012720:Severity of Illness Index; D016896:Treatment Outcome
D000911:Antibodies, Monoclonal; D061067:Antibodies, Monoclonal, Humanized; D018501:Antirheumatic Agents; D010919:Placebos; C502936:tocilizumab; D008727:Methotrexate