Posted 6/6/2016 5:45 PM (GMT 0)
This report was from 2015. I was impressed with the study cited for xeljanz. If I'm not mistaken, it has the highest clinical response rate (in studies that I've seen) of all biologics. I'm not great at reading clinical trial results so feel free to correct me if I'm wrong on this.
This phase two study was for moderate/severe UC patients who failed other biologics...see below.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4282853/
"1. Tofacitinib
Tofacitinib represents a new class of JAK inhibitor that inhibits JAK1, JAK2, and JAK3 to modulate the signaling of IL-2, IL-4, IL-7, IL-9, IL-15, and IL-21 receptors that are associated with six types of cytokine functions that integrate lymphocyte activation, function, and proliferation. In addition, by inhibiting JAK1, tofacitinib blocks the activities of proinflammatory cytokines including IL-6 and interferon γ, and by inhibiting JAK2, it blocks the signaling to erythropoietin. Because of its varied anti-inflammatory actions, tofacitinib is currently used in allograft rejection prevention, rheumatoid arthritis, and psoriasis.
Recently, a phase II, double-blind, placebo-controlled study evaluated the effects of tofacitinib administration for 8 weeks in 194 moderate-to-severe ulcerative colitis patients who did not respond to steroids, immunosuppressives, or anti-TNF agents.6 Patients were assigned to one of five treatment groups: tofacitinib 0.5 mg, 3 mg, 10 mg, 15 mg, or placebo in a 2:2:2:3:3 ratio. For 8 weeks, medications were taken twice daily, and the patients were followed for another 4 weeks.
The primary endpoint of clinical response rate at week 8 was 42% in the placebo group and 32%, 48%, 61%, and 78% in the tofacitinib 0.5 mg, 3 mg, 10 mg, and 15 mg twice daily groups, respectively (p=0.39, p=0.55, p=0.10, and p<0.001), showing a statistically significant difference only for the 15 mg twice daily group. The clinical remission rate at week 8 was 10% in the placebo group and 13%, 33%, 48%, and 41% in the tofacitinib groups, respectively, in order of increasing dosage, with the 10 mg and 15 mg twice daily groups showing statistically significant differences (all p<0.001). Tofacitinib dose-dependent increases in low-density lipoprotein cholesterol and high-density lipoprotein cholesterol were observed, and neutropenia which means absolute neutrophil count less than 1,500 per cubic mm was detected in three patients. In terms of serious adverse events, a single case each of postoperative abscess and anal abscess occurred in the 10 mg group. In conclusion, this study confirmed that tofacitinib was more effective than placebo in bringing about clinical response and clinical remission in moderate-to-severe ulcerative colitis patients.
In patients with active ulcerative colitis who do not respond to anti-TNF agents, tofacitinib shows clinical importance in that it can easily induce clinical response and clinical remission. However, since there have been no reports to date on remission maintenance with tofacitinib and only short-term side effects have been investigated, additional large-scale studies will be needed in the future to gather evidence regarding high remission maintenance and safety. Through this process, the role of tofacitinib in treating ulcerative colitis patients who do not respond to anti-TNF agents will be determined."