Objective: To explore herpes zoster (HZ) rates and live zoster vaccine (LZV) safety in a subset of patients with rheumatoid arthritis who received LZV before tofacitinib ± methotrexate (MTX), or adalimumab (ADA) plus MTX in the ORAL Strategy.
Methods: ORAL Strategy was a 1-year, phase IIIb/IV, randomized, triple-dummy, active-comparator-controlled study. MTX-inadequate responder patients received tofacitinib 5 mg twice daily (BID), tofacitinib 5 mg BID plus MTX, or ADA 40 mg every other week plus MTX (1:1:1 randomization). Eligible patients age ≥50 years could opt to receive LZV 28 days before initiating study treatment. HZ incidence rates (IRs; patients with events per 100 patient-years) were calculated. Opportunistic HZ infections (multidermatomal/disseminated), serious HZ events, and LZV-related adverse events were monitored.
Results: In ORAL Strategy, 216 of 1,146 patients (18.8%) received LZV. Overall, 18 patients (1.6%) developed HZ (vaccinated: n = 3; nonvaccinated: n = 15). HZ IRs were 1.1 (95% confidence interval [95% CI] 0.3-2.9), 2.3 (95% CI 1.0-4.6), and 1.7 (95% CI 0.6-3.7) for tofacitinib monotherapy, tofacitinib plus MTX, and ADA plus MTX, respectively, and were generally similar between vaccinated and nonvaccinated patients. Three multidermatomal, 1 disseminated, and 2 serious HZ events occurred. No vaccinated patients had zoster-like lesions within 42 days of vaccination; 1 patient had vaccination-site erythema.
Conclusion: LZV was well tolerated, and HZ IRs were generally similar between treatment groups and vaccinated versus nonvaccinated patients. However, ORAL Strategy was not powered for comparisons between vaccinated and nonvaccinated patients because <20% of all patients were vaccinated. Furthermore, LZV has been shown to be effective only in ~50% of individuals.
Trial registration: ClinicalTrials.gov NCT02187055.
© 2019 Pfizer Inc. Arthritis Care & Research published by Wiley Periodicals, Inc. on behalf of American College of Rheumatology.