diagnosis of psoriatic arthritis for a mean (SD) of 7.7 (7.2) years. At baseline, 80% and 53% of patients had enthesitis and dactylitis, respectively. At baseline, all patients were required to receive treatment with a stable dose of a nonbiologic DMARD (79% received methotrexate, 13% received sulfasalazine, 7% received leflunomide, 1% received other nonbiologic DMARDs). In both clinical trials, the primary endpoints were the ACR20 response and the change from baseline in HAQ-DI at Month 3.
Study PsA-I was a 12-month clinical trial in 422 patients who had an inadequate response to a nonbiologic DMARD (67% and 33% were inadequate responders to 1 nonbiologic DMARD and ≥2 nonbiologic DMARDs, respectively) and who were naïve to treatment with a TNF-inhibitor (TNFi). Patients were randomized in a 2:2:2:1:1 ratio to receive XELJANZ 5 mg twice daily, XELJANZ 10 mg twice daily, adalimumab 40 mg subcutaneously once every 2 weeks, placebo to XELJANZ 5 mg twice daily treatment sequence, or placebo to XELJANZ 10 mg twice daily treatment sequence, respectively; study drug was added to background nonbiologic DMARD treatment. At the Month 3 visit, all patients randomized to placebo treatment were advanced in a blinded fashion to a predetermined XELJANZ dose of 5 mg or 10 mg twice daily. Study PsA-I was not designed to demonstrate noninferiority or superiority to adalimumab.
Study PsA-II was a 6-month clinical trial in 394 patients who had an inadequate response to at least 1 approved TNFi (66%, 19%, and 15% were inadequate responders to 1 TNFi, 2 TNFi and ≥3 TNFi, respectively). Patients were randomized in a 2:2:1:1 ratio to receive XELJANZ 5 mg twice daily, XELJANZ 10 mg twice daily, placebo to XELJANZ 5 mg twice daily treatment sequence, or placebo to XELJANZ 10 mg twice daily treatment sequence, respectively; study drug was added to background nonbiologic DMARD treatment. At the Month 3 visit, placebo patients were advanced in a blinded fashion to a predetermined XELJANZ dose of 5 mg or 10 mg twice daily as in Study PsA-I.
Clinical Response
At Month 3, patients treated with either XELJANZ 5 mg or 10 mg twice daily had higher (p≤0.05) response rates versus placebo for ACR20, ACR50, and ACR70 in Study PsA-I and for ACR20 and ACR50 in Study PsA-II; ACR70 response rates were also higher for both XELJANZ 5 mg or 10 mg twice daily versus placebo in Study PsA-II, although the differences versus placebo were not statistically significant (p>0.05) (Tables 9 and 10).
Table 9: Proportion of Patients with an ACR Response in Study PsA-I* [Nonbiologic DMARD Inadequate Responders (TNFi-Naïve)]
Treatment Group Placebo XELJANZ
5 mg
Twice Daily XELJANZ
10 mg†
Twice Daily
N‡ 105 107 104
Response Rate Response Rate Difference (%)
95% CI from Placebo Response Rate Difference (%)
95% CI from Placebo
Subjects with missing data were treated as non-responders.
* Subjects received one concomitant nonbiologic DMARD. † The recommended dose of XELJANZ is 5 mg twice daily. ‡ N is number of randomized and treated patients.
Month 3
ACR20 33% 50% 17.1 (4.1, 30.2) 61% 27.2 (14.2, 40.3)
ACR50 10% 28% 18.5 (8.3, 28.7) 40% 30.9 (19.9, 41.8)
ACR70 5% 17% 12.1 (3.9, 20.2) 14% 9.7 (1.8, 17.6)
Table 10: Proportion of Patients with an ACR |
