Our clinical program with filgotinib in CD
Our FITZROY Phase 2 trial (174 patients) evaluated filgotinib once-daily versus placebo in patients with moderate to severely active CD and mucosal ulceration. Patients recruited were either anti-TNF naïve or anti-TNF failures. FITZROY was the first trial in CD to require endoscopic confirmation of lesions at entry, and also to include a placebo control on endoscopy. The trial comprised two parts, each of 10 weeks duration: the first part investigated the safety and efficacy of filgotinib 200 mg once daily versus placebo, while the second part of the trial investigated continued treatment through 20 weeks in an observational exploratory design. As reported in The Lancet (Vermeire et al), the FITZROY trial achieved the primary endpoint of clinical remission at 10 weeks: the percentage of patients overall achieving a Crohn’s Disease Activity Index (CDAI) score lower than 150 was statistically significantly higher in patients treated with filgotinib (47%) versus patients receiving placebo (23%). The share of patients achieving 100‑points clinical response (60%) also was significant versus those receiving placebo (41%). We believe that the activity observed with filgotinib in TNF naïve patients in FITZROY compared favorably to that seen with other treatments in other, separate trials:
Activity readouts in CD, TNF naive
Clinical remission: induction
Note: data not from head-to-head studies
Improvement in quality of life, histopathology, endoscopy assessment and biomarkers of inflammatory activity were also observed at week 10. Overall mean change in histopathology scores at week 10 for patients treated with filgotinib (‑3.5) versus placebo (‑0.6) was significantly different, confirming the clinical responses in the tissues of patients. More patients on filgotinib showed >50% improvement in SES-CD (endoscopy) scores versus placebo patients at week 10:
SES-CD50 achievement in FITZROY at week 10
Vermeire et al., The Lancet, 2016
Clinical responses were maintained from week 10 to week 20. Non-responders in the placebo arm from the first ten weeks received filgotinib 100 mg in the second ten weeks and showed improvement in clinical remission during the second part of the trial.
Overall, in the FITZROY trial at 20 weeks of treatment, filgotinib demonstrated a favorable safety profile consistent with the DARWIN trials in RA. An increase in hemoglobin was also observed in FITZROY, without difference between filgotinib and placebo. No clinically significant changes from baseline in neutrophils or liver function tests were observed.
Gilead initiated a Phase 3 trial (DIVERSITY) with filgotinib in CD in November 2016. The DIVERSITY Phase 3 trial investigates efficacy and safety of 100 mg and 200 mg filgotinib once-daily compared to placebo in patients with moderately to severely active disease including those with prior antibody therapy failure. Gilead will recruit approximately 1,300 patients from the United States, Europe, Latin America, Canada, and Asia/Pacific regions. Men and women in the DIVERSITY trial will be randomized to receive placebo, 100 mg or 200 mg filgotinib. In the United States, males may receive 200 mg if they failed at least one anti-TNF and vedolizumab, a monoclonal anti-integrin antibody marketed by Takeda. Gilead expects to complete recruitment for DIVERSITY in the first half of 2019.