Trial Outcomes & Findings for Efficacy and Safety Study of Ontamalimab as Maintenance Treatment in Participants With Moderate to Severe Crohn's Disease (CARMEN CD 307) (NCT NCT03627091)

The study was conducted at 33 sites between 06 February 2019 (first participant first visit) and 13 September 2021 (last participant last visit). 278 sites were initiated in this study, but only 33 sites had enrolled participants.

A total of 40 participants with moderate to severe Crohn's disease (CD) who completed their participation in an induction study (either SHP647-305 \[NCT03559517\] or SHP647-306 \[NCT03566823\]) and fulfilled the efficacy entry criteria of this study, including achieving endoscopic and/or clinical response were enrolled and received study treatment in this study. The study was closed early due to discontinuation of the ontamalimab clinical trial program.

Efficacy and Safety Study of Ontamalimab as Maintenance Treatment in Participants With Moderate to Severe Crohn's Disease (CARMEN CD 307)

Clinical remission was defined by 2-item PRO sub-scores of average worst daily abdominal pain less than or equal to (\<=) 3 (based on 11 point numerical rating scale \[NRS\] ranging from 0 \[no pain\] to 10 \[worst imaginable pain\]); and average daily stool frequency \<=2 of type 6/7 (very soft stools/liquid stools) as per the Bristol Stool Form Scale (BSFS) over the 7 most recent days. BSFS ranges from 1 (separate hard lumps, hard to pass), 2 (sausage-shaped, but lumpy), 3 (like a sausage but with cracks on the surface), 4 (like a sausage or snake, smooth and soft), 5 (soft blobs with clear-cut edges), 6 (fluffy pieces with ragged edges, a mushy stool), 7 (watery, no solid pieces, entirely liquid). Participants with missing data at Week 52 or discontinuation before Week 52 were considered failures. Number of participants with clinical remission at Week 52 were reported.

Enhanced endoscopic response was defined as a decrease in Simple Endoscopic Score for Crohn's disease (SES-CD) of at least 50 percent (%) from induction study (either SHP647-305 \[NCT03559517\] or SHP647-306 \[NCT03566823\] baseline. The SES-CD considers ileum, right colon, transverse colon, left colon, rectum in terms of: size of ulcers, ulcerated surface, affected surface and presence of narrowing. Each graded from 0-3. Scale ranges from 0-56 with a higher score indicating greater severity of disease. Participants with missing data at Week 52 or who discontinued before Week 52 were considered non responders. Number of participants with enhanced endoscopic response at Week 52 were reported.

Clinical remission was defined as a CDAI score of \<150. CDAI assessed CD based on clinical signs/symptoms such as number of liquid stools, intensity of abdominal pain, general well-being (subjective), and presence of complications, use of antidiarrheal, presence of abdominal mass, physical examination and hematocrit (objective). CDAI score is equal to sum of weighted scores for subjective and objective items which range from 0-149 points: asymptomatic remission, 150-220 points: mild to moderate active CD, 221-450 points: moderate to severe active CD, \>451 points: severely active to fulminant disease. Higher score indicating more severity. Participants with missing data at Week 52 or who discontinued before Week 52 were considered failures. Number of participants with clinical remission as measured by CDAI at Week 52 were reported.

Glucocorticoid-free clinical remission defined as clinical remission by 2-item PRO not requiring any treatment with glucocorticoids for at least 12 weeks prior to Week 52 visit. Clinical remission defined by 2-item PRO sub-scores of average worst daily abdominal pain \<=3 (based on 11 point NRS ranging from 0 \[no pain\] to 10 \[worst imaginable pain\]); and average daily stool frequency\<=2 of type 6/7 (very soft stools/liquid stools) as per the BSFS over the 7 most recent days. BSFS ranges from 1 (separate hard lumps, hard to pass), 2 (sausage-shaped, but lumpy), 3 (like a sausage but with cracks on the surface), 4 (like sausage or snake, smooth and soft), 5 (soft blobs with clear-cut edges), 6 (fluffy pieces with ragged edges, mushy stool), 7 (watery, no solid pieces, entirely liquid). Participants with missing data at Week 52 or who discontinued before Week 52 were non-responders. Number of participants with glucocorticoid-free clinical remission response at Week 52 were reported.

Clinical remission was defined by CD daily e-diary 2-item PRO subscores of average daily abdominal pain \<=1 (based on the 4 point scale, with scores ranging from 0 \[none\] to 3 \[severe\]) over the 7 most recent days and average daily stool frequency \<=3 of type 6/7 (very soft stools/liquid stools) as per the BSFS over the 7 most recent days. BSFS ranges from 1 (separate hard lumps, hard to pass), 2 (sausage-shaped, but lumpy), 3 (like a sausage but with cracks on the surface), 4 (like a sausage or snake, smooth and soft), 5 (soft blobs with clear-cut edges), 6 (fluffy pieces with ragged edges, a mushy stool), 7 (watery, no solid pieces, entirely liquid). Participants with missing data at Week 52 or who discontinued before Week 52 were considered failures. Number of participants with clinical remission based on Crohn's Disease (CD) e-diary Sub-scores for abdominal pain was was reported.

Sustained clinical remission was defined as clinical remission by 2-item PRO at both Week 52 visit and the maintenance baseline in this Study. Clinical remission was defined by 2-item PRO sub-scores of average worst daily abdominal pain less than or equal to (\<=) 3 (based on 11 point NRS ranging from 0 \[no pain\] to 10 \[worst imaginable pain\]); and average daily stool frequency \<=2 of type 6/7 (very soft stools/liquid stools) as per the BSFS over the 7 most recent days. BSFS ranges from 1 (separate hard lumps, hard to pass), 2 (sausage-shaped, but lumpy), 3 (like a sausage but with cracks on the surface), 4 (like a sausage or snake, smooth and soft), 5 (soft blobs with clear-cut edges), 6 (fluffy pieces with ragged edges, a mushy stool), 7 (watery, no solid pieces, entirely liquid). Number of participants with sustained clinical remission at Week 52 were reported.

Sustained enhanced endoscopic response was defined as enhanced endoscopic response at both Week 52 visit and the maintenance baseline in this study. Enhanced endoscopic response was defined as a decrease in SES-CD of at least 50 % from induction study (either SHP647-305 \[NCT03559517\] or SHP647-306 \[NCT03566823\]) baseline. The SES-CD considers ileum, right colon, transverse colon, left colon, rectum in terms of: size of ulcers, ulcerated surface, affected surface and presence of narrowing. Each graded from 0-3. Scale ranges from 0-56 with a higher score indicating greater severity of disease. Number of participants with sustained enhanced endoscopic response at Week 52 were reported.

Clinical remission was defined by 2-item PRO sub-scores of average worst daily abdominal pain \<=3 (based on 11-point NRS) over the 7 most recent days and average daily stool frequency \<= 2 of Type 6/7 (very soft stools/liquid stools) as shown in the BSFS over the 7 most recent days. Participants with missing data at Week 52 or who discontinued before Week 52 were considered failures. Enhanced endoscopic response was defined as a decrease in SES-CD of at least 50% from induction study (either SHP647-305 \[NCT03559517\] or SHP647-306 \[NCT03566823\]) baseline. Participants with missing data at Week 52 or who discontinued before Week 52 were considered non-responders.

Complete endoscopic healing was defined as SES-CD scale score from 0-2. The SES-CD considers ileum, right colon, transverse colon, left colon, rectum in terms of: size of ulcers, ulcerated surface, affected surface and presence of narrowing. Each graded from 0-3. Scale ranges from 0-56 with a higher score indicating greater severity of disease. Participants with missing data at Week 52 or who discontinued before Week 52 were considered failures. Number of participants with complete endoscopic healing at Week 52 were reported.