A Study of Mirikizumab (LY3074828) in Participants With Active Crohn's Disease

Endoscopic response defined as ≥ 50% reduction from baseline in Simple Endoscopic Score for Crohn's Disease (SES-CD) at Week 12. The SES-CD evaluates 4 endoscopic variables: presence and size of ulcers, proportion of surface covered by ulcers, proportion of surface affected by disease, and presence and severity of stenosis. The total SES-CD calculated as sum of 4 variables for 5 bowel segments: (ileum;right,transverse,and left colon;and rectum): presence and size of ulcers (none = score 0; diameter 0.1-0.5 cm = score 1; 0.5-2 cm = score 2; >2 cm = score 3); extent of ulcerated surface (none = 0; <10% = 1;10-30% = 2;>30% = 3);extent of affected surface (none = 0; <50% = 1;50-75% = 2;>75% =3); and presence and type of narrowings (none=0; single, can be passed=1; multiple,can be passed=2; cannot be passed=3). Total SES-CD scores range from 0 to 56, with higher scores indicating more severe disease.

Endoscopic remission defined as SES-CD of <4 ileal-colonic or <2 for isolated ileal disease, and no subscore >1 at week 12. The SES-CD evaluates 4 endoscopic variables: presence and size of ulcers, proportion of surface covered by ulcers, proportion of surface affected by disease, and presence and severity of stenosis. The total SES-CD is calculated as the sum of the 4 variables for the 5 bowel segments: (ileum; right, transverse, and left colon; and rectum): presence and size of ulcers (none = score 0; diameter 0.1-0.5 cm = score 1; 0.5-2 cm = score 2; greater than (>) 2 cm = score 3); extent of ulcerated surface (none = 0; less than (<) 10% = 1; 10-30% = 2; >30% = 3); extent of affected surface (none = 0; <50% = 1; 50-75% = 2; >75% = 3); and presence and type of narrowings (none=0; single, can be passed=1; multiple, can be passed=2; cannot be passed=3). Total SES-CD scores range from 0 to 56, with higher scores indicating more severe disease.

PRO remission is defined as stool frequency (SF) ≤2.5 and abdominal pain (AP) ≤1 and no worse than baseline at week 12. SF captures the number of liquid or very soft stools. AP score is classified as 0=none, 1=mild, 2=moderate, 3=severe.

The PGRS is a 1-item patient-rated questionnaire designed to assess the participant's rating of their disease symptom severity over the past 24 hours. Responses are graded on a 6-point scale in which a score of 1 indicates the subject has no symptoms (that is, "none") and a score of 6 indicates that the participant's symptom are "very severe." Least Squares Mean (LS Mean) was calculated using Mixed Model for Repeated Measures (MMRM) model with treatment, geographic region, geographic region, prior biologic CD therapy use (prior biologic experience versus prior biologic naive), baseline score, visit, and the interaction of treatment-by-visit and baseline-by-visit as fixed factors.

The PGRC scale is a patient-rated instrument designed to assess the participant's rating of change in their symptom(s). Responses are graded on a 7-point Likert scale in which a score of 1 indicates that the participant's symptom is "very much better," a score of 4 indicates that the participant's symptom has experienced "no change," and a score of 7 indicates that the participant's symptom is "very much worse."

The IBDQ is a 32-item self-administered questionnaire. The IBDQ has 4 dimensions: bowel symptoms (10 items), systemic symptoms (5 items), emotional function (12 items), and social function (5 items). Responses are graded on a 7-point Likert scale in which 7 denotes "not a problem at all" and 1 denotes "a very severe problem." Scores range from 32 to 224; a higher score indicates a better quality of life. LS Mean was calculated using Mixed Model for Repeated Measures (MMRM) model with treatment, geographic region, geographic region, prior biologic CD therapy use (prior biologic experience versus prior biologic naive), baseline score, visit, and the interaction of treatment-by-visit and baseline-by-visit as fixed factors.

The Functional Assessment of Chronic Illness Therapy-Fatigue (FACIT-F) Scale is a13-item, symptom-specific questionnaire that specifically assesses the participant's self-reported severity of fatigue and its impact upon daily activities and functioning. The FACIT-F uses a numeric rating scale of 0-4 associated with a range over "Not at all" to "Very much" for each item to assess fatigue and its impact in the past 7 days. Total scores range from 0 to 52, with higher scores indicating less fatigue. LS Mean was calculated using Mixed Model for Repeated Measures (MMRM) model with treatment, geographic region, geographic region, prior biologic CD therapy use (prior biologic experience versus prior biologic naive), baseline score, visit, and the interaction of treatment-by-visit and baseline-by-visit as fixed factors.

The SF-36 is a health-related survey that assesses participant's quality of life and consists of 36 questions covering 8 health domains:physical functioning, bodily pain, role limitations due to physical problems and emotional problems, general health, mental health, social functioning, vitality, 2 component scores (MCS and PCS). MCS consisted of social functioning, vitality, mental health, and role-emotional scales. PCS consisted of physical functioning, bodily pain, role-physical, and general health scales. Each domain is scored by summing individual items and transforming scores into a 0 to 100 scale with higher scores indicating better health status or functioning. LS Mean was calculated using Mixed Model for Repeated Measures (MMRM) model with treatment, geographic region, geographic region, prior biologic CD therapy use (prior biologic experience versus prior biologic naive), baseline score, visit, and the interaction of treatment-by-visit and baseline-by-visit as fixed factors.

Population mean (between-subject coefficient variance [CV %]) apparent clearance. Clearance is estimated based on concentration data collected in the time frame of 0-208 weeks.

Population mean (between-subject coefficient variance [CV %]) apparent volume of distribution. Volume of distribution is estimated based on concentration data collected in the time frame of 0-208 weeks.