Etrasimod Versus Placebo for the Treatment of Moderately Active Ulcerative Colitis

Percentage of Participants Achieving Symptomatic Remission at Week 52

Symptomatic remission was defined as SF =0 (or = 1 with a \>= 1 point decrease from baseline) and RB =0. SF subscore: reported number of stools in a 24-hour period relative to normal number of stools for that participant in the same period, scores ranged from 0 (normal number of stools) to 3 (5 or more stools than normal), higher scores = more severity. RB subscore: reported the most severe amount of blood passed per rectum in a 24-hour period, score ranged from 0 (no blood seen) to 3 (blood alone passes), higher scores = more severity. Percentage of participants achieving symptomatic remission at Week 52 was evaluated in this endpoint.

Time frame: Week 52

Percentage of Participants Achieving Complete Symptomatic Remission at Week 52

Complete symptomatic remission was defined as participants with RB = 0 and SF = 0. SF subscore: reported number of stools in a 24-hour period relative to normal number of stools for that participant in the same period, scores ranged from 0 (normal number of stools) to 3 (5 or more stools than normal), higher scores = more severity. RB subscore: reported the most severe amount of blood passed per rectum in a 24-hour period, score ranged from 0 (no blood seen) to 3 (blood alone passes), higher scores = more severity. Percentage of participants achieving complete symptomatic remission at Week 52 was evaluated in this endpoint.

Time frame: Week 52

Percentage of Participants Achieving Histologic-Endoscopic Mucosal Improvement at Week 52

Histologic-endoscopic mucosal improvement was defined as ES \<=1 (excluding friability) with Geboes score \<2.0. ES reported worst appearance of mucosa on flexible sigmoidoscopy or colonoscopy, score ranged from 0 (normal or inactive disease) to 3 (severe disease \[spontaneous bleeding, ulceration\]), higher scores = more severity. The Geboes score grading system was a validated score for evaluating histologic disease activity in UC as follows: grade 0 = structural and architectural changes; grade 1 = chronic inflammatory infiltrate; grade 2 = lamina propria neutrophils and eosinophils; grade 3 = neutrophils in the epithelium; grade 4 = crypt destruction; grade 5 = erosions or ulceration. A higher Geboes score indicated more severe disease. Percentage of participants achieving mucosal improvement at Week 52 was evaluated in this endpoint.

Time frame: Week 52

Percentage of Participants Achieving Clinical Remission at Both Weeks 12 and 52 [Combined] Using MMS

MMS is used to assess disease activity in participants with UC and has following components: ES, RB and SF. Each component score ranges from 0 to 3 (0= normal, 1= mild, 2= moderate, 3= severe); higher scores = more severe disease. ES reported worst appearance of mucosa on flexible sigmoidoscopy or colonoscopy, score ranged from 0 (normal or inactive disease) to 3 (severe disease). RB: reported the most severe amount of blood passed per rectum in a 24-hour period, score ranged from 0 (no blood seen) to 3 (blood alone passes). SF reported number of stools in a 24-hour period relative to normal number of stools for that participant in the same period, score ranged from 0 (normal number of stools) to 3 (5 or more stools than normal). Clinical remission per FDA draft guidance: SF =0 or =1 and no greater than baseline, RB =0, and ES \<=1 (excluding friability). Percentage of participants who achieved clinical remission at both the time points Week 12 and Week 52 \[Combined\] are reported.

Time frame: Weeks 12 and 52 [Combined]

Percentage of Participants With 12-Week Corticosteroid-Free Clinical Remission at Week 52 Among Participants Receiving Corticosteroids at Baseline Using MMS

MMS has following components:ES, RB and SF. Each component score ranges from 0 to 3(0=normal,1=mild,2=moderate,3=severe); higher scores indicating more severe disease. ES:worst appearance of mucosa on flexible sigmoidoscopy or colonoscopy, score ranged from 0(normal or inactive disease)to 3(severe disease). RB:most severe amount of blood passed per rectum in a 24-hour period, score ranged from 0(no blood seen)to 3(blood alone passes). SF:number of stools in a 24-hour period relative to normal number of stools for that participant in the same period, score ranged from 0(normal number of stools)to 3(5 or more stools than normal). CR per FDA draft guidance as: SF =0 or =1 and no greater than baseline, RB=0, and ES \<=1(excluding friability). 12-week corticosteroid-free CR was defined as CR at Week 52 and corticosteroid-free for \>=12 weeks immediately prior to Week 52. The baseline was balanced between treatment groups and representative of participants with mildly to moderately active UC.

Time frame: Week 52

Percentage of Participants With 12-Week Corticosteroid-Free Clinical Remission at Week 52 Using MMS

MMS has following components: ES, RB and SF. Each component score ranges from 0 to 3 (0=normal,1=mild,2=moderate,3=severe); higher scores indicating more severe disease. ES: worst appearance of mucosa on flexible sigmoidoscopy or colonoscopy, score ranged from 0(normal or inactive disease) to 3 (severe disease). RB: most severe amount of blood passed per rectum in a 24-hour period, score ranged from 0(no blood seen) to 3 (blood alone passes). SF: number of stools in a 24-hour period relative to normal number of stools for that participant in the same period, score ranged from 0(normal number of stools) to 3 (5 or more stools than normal). CR per FDA draft guidance as: SF =0 or =1 and no greater than baseline, RB=0, and ES \<=1(excluding friability). 12-week corticosteroid-free CR was defined as CR at Week 52 and corticosteroid-free for \>=12 weeks immediately prior to Week 52.

Time frame: Week 52

Percentage of Participants Achieving 4-Week Corticosteroid-Free Clinical Remission at Week 52 Among Participants Receiving Corticosteroids at Baseline Using MMS

MMS has following components: ES, RB and SF; each ranged as 0=normal,1=mild,2=moderate,3=severe; total MMS score 0-9; higher scores=more severe disease. ES:worst appearance of mucosa on flexible sigmoidoscopy or colonoscopy, score ranged from 0(normal or inactive disease)to 3(severe disease). RB:most severe amount of blood passed per rectum in a 24-hour period, score ranged from 0(no blood seen) to 3(blood alone passes). SF:number of stools in a 24-hour period relative to normal number of stools for that participant in the same period, score ranged from 0(normal number of stools)to 3(5 or more stools than normal). CR per FDA draft guidance as: SF =0 or =1 and no greater than baseline, RB=0, and ES \<=1(excluding friability). 4-week corticosteroid-free CR was defined as CR at Week 52 and corticosteroid-free for \>=4 weeks immediately prior to Week 52. The baseline was balanced between treatment groups and representative of participants with mildly to moderately active UC.

Time frame: Week 52

Percentage of Participants With 4-Week Corticosteroid-Free Clinical Remission at Week 52 Using MMS

MMS has following components: ES, RB and SF. Each component score ranges from 0 to 3 (0=normal,1=mild,2=moderate,3=severe); where total score is sum of three components giving total MMS score as 0 to 9; higher scores indicating more severe disease. ES: worst appearance of mucosa on flexible sigmoidoscopy or colonoscopy, score ranged from 0(normal or inactive disease) to 3 (severe disease). RB: most severe amount of blood passed per rectum in a 24-hour period, score ranged from 0(no blood seen) to 3 (blood alone passes). SF: number of stools in a 24-hour period relative to normal number of stools for that participant in the same period, score ranged from 0 (normal number of stools) to 3 (5 or more stools than normal). CR per FDA draft guidance as: SF =0 or =1 and no greater than baseline, RB=0, and ES \<=1(excluding friability). 4-week corticosteroid-free CR was defined as CR at Week 52 and corticosteroid-free for \>=4 weeks immediately prior to Week 52.

Time frame: Week 52

Percentage of Participants Achieving Clinical Response at Week 12 Using MMS

Clinical response was defined as a \>=2-point and \>=30 percentage (%) decrease from baseline in MMS, and a \>=1-point decrease from baseline in RB subscore or an absolute RB subscore \<=1 and is as per FDA draft guidance. MMS was used to assess disease activity in participants with UC and has following components: ES, RB and SF. Each component score ranges from 0 to 3 (0= normal, 1= mild, 2= moderate, 3= severe); where total score is sum of three components giving total MMS score as 0 to 9; higher scores indicating more severe disease. ES reported worst appearance of mucosa on flexible sigmoidoscopy or colonoscopy, score ranged from 0 (normal or inactive disease) to 3 (severe disease \[spontaneous bleeding, ulceration\]). Percentage of participants achieving clinical response at Week 12 was evaluated in this endpoint.

Time frame: Week 12

Percentage of Participants Achieving Clinical Response at Week 52 Using MMS

Clinical response was 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 and is as per FDA draft guidance. MMS is used to assess disease activity in participants with UC and has following components: ES, RB and SF. Each component scores ranges from 0 to 3 (0= normal, 1= mild, 2= moderate, 3= severe); where total score is sum of three components giving total MMS score as 0 to 9; higher scores indicating more severe disease. ES reported worst appearance of mucosa on flexible sigmoidoscopy or colonoscopy, scores ranged from 0 (normal or inactive disease) to 3 (severe disease \[spontaneous bleeding, ulceration\]). Percentage of participants achieving clinical response at Week 52 was evaluated in this endpoint.

Time frame: Week 52

Percentage of Participants Achieving Endoscopic Improvement at Week 12

Endoscopic improvement was defined as ES \<=1 (excluding friability). ES reported worst appearance of mucosa on flexible sigmoidoscopy or colonoscopy, scores ranged from 0 (normal or inactive disease) to 3 (severe disease \[spontaneous bleeding, ulceration\]), higher scores = more severity. Percentage of participants achieving endoscopic improvement at Week 12 was evaluated in this endpoint.

Time frame: Week 12

Percentage of Participants Achieving Histologic-Endoscopic Mucosal Improvement at Week 12

Histologic-endoscopic mucosal improvement was defined as ES \<=1 (excluding friability) with Geboes score \<2.0. ES reported worst appearance of mucosa on flexible sigmoidoscopy or colonoscopy, scores ranged from 0 (normal or inactive disease) to 3 (severe disease \[spontaneous bleeding, ulceration\]), higher scores = more severity. The Geboes score grading system was a validated score for evaluating histologic disease activity in UC as follows: grade 0 = structural and architectural changes; grade 1 = chronic inflammatory infiltrate; grade 2 = lamina propria neutrophils and eosinophils; grade 3 = neutrophils in the epithelium; grade 4 = crypt destruction; grade 5 = erosions or ulceration. A higher Geboes score indicated more severe disease. Percentage of participants achieving mucosal improvement at Week 12 was evaluated in this endpoint.

Time frame: Week 12

Percentage of Participants Achieving Symptomatic Remission at Week 12

Symptomatic remission was defined as SF =0 (or = 1 with a \>= 1 point decrease from baseline) and RB =0. SF subscore: reported number of stools in a 24-hour period relative to normal number of stools for that participant in the same period, scores ranged from 0 (normal number of stools) to 3 (5 or more stools than normal), higher scores = more severity. RB subscore: reported the most severe amount of blood passed per rectum in a 24-hour period, scores ranged from 0 (no blood seen) to 3 (blood alone passes), higher scores = more severity. Percentage of participants achieving symptomatic remission at Week 12 was evaluated in this endpoint.

Time frame: Week 12

Percentage of Participants Achieving Complete Symptomatic Remission at Week 12

Complete symptomatic remission was defined as participants with RB = 0 and SF = 0. SF subscore: reported number of stools in a 24-hour period relative to normal number of stools for that participant in the same period, scores ranged from 0 (normal number of stools) to 3 (5 or more stools than normal), higher scores = more severity. RB subscore: reported the most severe amount of blood passed per rectum in a 24-hour period, scores ranged from 0 (no blood seen) to 3 (blood alone passes), higher scores = more severity. Percentage of participants achieving complete symptomatic remission at Week 12 was evaluated in this endpoint.

Time frame: Week 12

Percentage of Participants Achieving Change From Baseline in Both ES and RB or in Both ES and SF at Week 12

ES reported worst appearance of mucosa on flexible sigmoidoscopy or colonoscopy, scores ranged from 0 (normal or inactive disease) to 3 (severe disease \[spontaneous bleeding, ulceration\]), higher scores = more severity. RB: reported the most severe amount of blood passed per rectum in a 24-hour period, scores ranged from 0 (no blood seen) to 3 (blood alone passes), higher scores = more severity. SF reported number of stools in a 24-hour period relative to normal number of stools for that participant in the same period, score ranged from 0 (normal number of stools) to 3 (5 or more stools than normal), higher scores = more severity. Percentage of participants with reduction from baseline in both ES and RB or in both ES and SF at Week 12 was evaluated in this endpoint. The baseline primary analysis set was balanced between treatment groups and representative of participants with mildly to moderately active UC.

Time frame: Baseline to Week 12

Percentage of Participants Achieving Histologic Response Based on the Geboes Grading System at Week 12

Histologic response based on the Geboes grading system was defined as Geboes score \<=3.1. The Geboes score grading system is a validated score for evaluating histologic disease activity in UC as follows: grade 0 = structural and architectural changes; grade 1 = chronic inflammatory infiltrate; grade 2 = lamina propria neutrophils and eosinophils; grade 3 = neutrophils in the epithelium; grade 4 = crypt destruction; grade 5 = erosions or ulceration. A higher Geboes score indicated more severe disease. Percentage of participants achieving histologic response based on the Geboes grading system at week 12 was evaluated in this endpoint.

Time frame: Week 12

Percentage of Participants Achieving Histologic Response Based on Robarts Histopathology Index (RHI) at Week 12

RHI is an evaluative index, derived from the Geboes score, that is designed to be reproducible and responsive to clinically meaningful change in disease activity over time. Histologic response based on RHI was defined as decrease in RHI of \>=7 points from baseline. Total RHI score ranges from 0 (no disease activity) to 33 (severe disease activity), higher score = more severity. Percentage of participants achieving histologic response based on RHI at Week 12 was evaluated in this endpoint.

Time frame: Week 12