VELSIPITY™ Clinical Studies

14 CLINICAL STUDIES

The efficacy of VELSIPITY was evaluated in 2 randomized, double-blind, placebo-controlled clinical studies [UC-1 (NCT03945188) and UC-2 (NCT03996369)] in adult subjects with moderately to severely active ulcerative colitis who had an inadequate response, loss of response, or intolerance to one or more of the following treatment options: oral aminosalicylates, corticosteroids, thiopurines, Janus kinase (JAK) inhibitors, or biologic therapies (e.g., TNF blocker, anti-integrin, anti-IL12/23). UC-1 was a 52-week study and UC-2 was a 12-week study. In both studies, subjects were randomized to VELSIPITY or placebo and continued on treatment for the entire duration of the study.

Disease severity was assessed based on the modified Mayo score (mMS), a 3-component Mayo score (0 to 9) which consists of the following subscores (0 to 3 for each subscore): stool frequency (SF), rectal bleeding (RB), and findings on centrally read endoscopy score (ES). An ES of 2 was defined by marked erythema, lack of vascular pattern, any friability, and/or erosions, and a score of 3 was defined by spontaneous bleeding and ulceration.

Subjects in these studies may have received other concomitant UC therapies including stable daily doses of oral aminosalicylates and/or oral corticosteroids (≤20 mg/day prednisone, ≤9 mg/day budesonide, or equivalent steroid). Concomitant treatment with immunomodulators (e.g., thiopurines, methotrexate), biologic therapies, JAK inhibitors, rectal 5-ASA, or rectal corticosteroids was not permitted.

Endpoints and Results Study UC-1

In UC-1, efficacy was evaluated in 408 adult subjects with a baseline mMS of 5 to 9 (median of 7), including a centrally read endoscopy subscore of 2 or 3. Subjects were randomized 2:1 to receive VELSIPITY 2 mg or placebo administered orally once daily. Subjects had a mean age of 41 years (range 18 to 78 years); 45% were female; and 89% identified as White, 7% as Asian, 2% as Black or African American, 1% as American Indian or Alaska Native, and 1% did not report their racial group. A total of 30% of subjects had prior exposure to biologic/JAK inhibitors and a total of 14% of subjects had exposure to >1 biologic/JAK inhibitor. At baseline, 68% of subjects were receiving oral aminosalicylates and 31% of subjects were receiving oral corticosteroids.

The coprimary endpoints were the proportion of subjects achieving clinical remission at Week 12 and at Week 52. The secondary endpoints included the proportion of subjects achieving endoscopic improvement, histologic-endoscopic mucosal improvement, corticosteroid-free clinical remission, and maintenance of clinical remission (see Table 4).

The relationship of histologic-endoscopic mucosal improvement at Week 12 or Week 52 to disease progression and longer-term outcomes after Week 52 was not evaluated in Study UC-1.

Clinical Response

A greater proportion of subjects treated with VELSIPITY compared to placebo achieved clinical response, defined as a ≥2 point and ≥30% decrease from baseline in mMS, and a ≥1 point decrease from baseline in RB subscore or an absolute RB subscore ≤1 at Week 12 (62% vs 34%).

Stool Frequency and Rectal Bleeding Subscores

Decreases in SF subscores were observed as early as Week 2 and decreases in RB subscores were observed as early as Week 4 in subjects treated with VELSIPITY compared to placebo.

Endoscopic Assessment

Normalization of the endoscopic appearance of the mucosa (endoscopic remission) was defined as ES of 0. A greater proportion of subjects treated with VELSIPITY compared to placebo achieved endoscopic remission by Week 12 (15% vs 4%), Week 52 (26% vs 6%), and both Week 12 and Week 52 (11% vs 1%).

Endpoints and Results Study UC-2

In UC-2, efficacy was evaluated in 333 adult subjects with a baseline mMS of 5 to 9 (median of 7), including a centrally read endoscopy subscore of 2 or 3. Subjects were randomized 2:1 to receive VELSIPITY 2 mg or placebo administered orally once daily. Subjects had a mean age of 41 years (range 18 to 73 years); 41% were female; and 76% identified as White, 19% as Asian, 2% as American Indian or Alaska Native, 1% as Black or African American, and 2% as multiple racial groups or did not report their racial group. A total of 34% of subjects had prior exposure to biologic/JAK inhibitors and a total of 17% of subjects had exposure to >1 biologic/JAK inhibitor. At baseline, 66% of subjects were receiving oral aminosalicylates and 28% of subjects were receiving oral corticosteroids.

The primary endpoint was the proportion of subjects achieving clinical remission at Week 12. The secondary endpoints included the proportion of subjects achieving endoscopic improvement and histologic-endoscopic mucosal improvement at Week 12 (see Table 5).

The relationship of histologic-endoscopic mucosal improvement at Week 12 to disease progression and longer-term outcomes after Week 12 was not evaluated in Study UC-2.

Clinical Response

A greater proportion of subjects treated with VELSIPITY compared to placebo achieved clinical response, defined as a ≥2 point and ≥30% decrease from baseline in mMS, and a ≥1 point decrease from baseline in RB subscore or an absolute RB subscore ≤1 at Week 12 (62% vs 41%).

Stool Frequency and Rectal Bleeding Subscores

Decreases in SF subscores were observed as early as Week 2 and decreases in RB subscores were observed as early as Week 4 in subjects treated with VELSIPITY compared to placebo.

Endoscopic Assessment

Normalization of the endoscopic appearance of the mucosa (endoscopic remission) was defined as ES of 0. A greater proportion of subjects treated with VELSIPITY compared to placebo achieved endoscopic remission by Week 12 (17% vs 8%).