Please assess the completion status of the following clinical trial:

Trial Title: A Study to Assess Whether Etrolizumab is a Safe and Efficacious Treatment for Participants With Moderately to Severely Active Crohn's Disease

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: DOUBLE
- Phase: PHASE3
- Number of Arms: 11.0

Eligibility Criteria:
Inclusion Criteria:~* Moderately to severely active Crohn's Disease (CD) as determined by the CDAI, patient reported outcomes and endoscopically defined disease activity in the ileum and/or colon~* Intolerance, refractory disease, or no response to corticosteroids (CS), immunosuppressants (IS), or anti-TNF therapy within 5 years from screening. Participants who have not previously demonstrated inadequate response or intolerance to one or more anti-TNF therapies are eligible to participate in the study provided they are intolerant or refractory to CS or IS therapy~* Use of effective contraception as defined by the protocol~Exclusion Criteria:~* A history of, or current conditions affecting the digestive tract, such as ulcerative colitis, indeterminate colitis, fistulizing disease, abdominal or perianal abscess, adenomatous colonic polyps not excised, colonic mucosal dysplasia, and short bowel syndrome~* Planned surgery for CD~* Ileostomy or colostomy~* Has received non-permitted inflammatory bowel disease (IBD) therapies (including natalizumab, vedolizumab, and efalizumab, as stated in the protocol)~* Any prior treatment with ustekinumab within 14 weeks prior to randomization~* Chronic hepatitis B or C infection, human immunodeficiency virus (HIV), active or latent tuberculosis (participants with prior history of Bacillus Calmette-Guérin \[BCG\] vaccination must pass protocol-defined screening criteria)~* Sinus tract with evidence for infection (e.g., purulent discharge) in the clinical judgment of the investigator. Fistulas related to CD are not exclusionary~* Any prior treatment with anti-adhesion molecules (e.g., anti-mucosal addressin cell adhesion molecule \[anti-MAdCAM-1\])~* Any major episode of infection requiring treatment with intravenous antibiotics ≤8 weeks prior to screening or oral antibiotics ≤4 weeks prior to screening. Treatment with antibiotics as adjunctive therapy for CD in the absence of documented infection is not exclusionary~* Hospitalization (other than for elective reasons) within 4 weeks prior to randomization

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 80 Years
- Healthy Volunteers: f

Study Arms:
- Induction Phase - Cohort 1 (Exploratory): Etrolizumab 210 mg (Type: EXPERIMENTAL): Cohort 1 enrolled participants first before Cohorts 2 and 3 in order to conduct an exploratory analysis on induction data. Participants randomized to this arm will receive one subcutaneous (SC) injection of etrolizumab (210 mg) at Weeks 0, 2, 4, 8, and 12 during the 14-week Induction Phase. In order to preserve the masking, participants will also receive one SC injection of etrolizumab-matching placebo at Weeks 0, 4, 8, and 12.
- Induction Phase - Cohort 1 (Exploratory): Etrolizumab 105 mg (Type: EXPERIMENTAL): Cohort 1 enrolled participants first before Cohorts 2 and 3 in order to conduct an exploratory analysis on induction data. Participants randomized to this arm will receive one SC injection of etrolizumab (105 mg) at Weeks 0, 4, 8, 12 and one SC injection of etrolizumab-matching placebo at Week 2 during the 14-week Induction Phase. In order to preserve the masking, participants will also receive one SC injection of etrolizumab-matching placebo at Weeks 0, 4, 8, and 12.
- Induction Phase - Cohort 1 (Exploratory): Placebo (Type: PLACEBO_COMPARATOR): Cohort 1 enrolled participants first before Cohorts 2 and 3 in order to conduct an exploratory analysis on induction data. Participants randomized to this arm will receive two SC injections of etrolizumab-matching placebo at Weeks 0, 4, 8, and 12 (and one SC injection of etrolizumab-matching placebo at Week 2) during the 14-week Induction Phase, in order to preserve the masking.
- Induction Phase - Cohort 2 (Open-Label): Etrolizumab 210 mg (Type: EXPERIMENTAL): Cohort 2 is enrolling participants after Cohort 1 and is considered a feeder cohort to help achieve the necessary sample size for the Maintenance Phase. Participants randomized to this arm will receive one SC injection of open-label etrolizumab (210 mg) at Weeks 0, 2, 4, 8, and 12 during the 14-week Induction Phase. In order to preserve the masking for the dose of etrolizumab, participants will also receive one SC injection of etrolizumab-matching placebo at Weeks 0, 4, 8, and 12.
- Induction Phase - Cohort 2 (Open-Label): Etrolizumab 105 mg (Type: EXPERIMENTAL): Cohort 2 is enrolling participants after Cohort 1 and is considered a feeder cohort to help achieve the necessary sample size for the Maintenance Phase. Participants randomized to this arm will receive one SC injection of open-label etrolizumab (105 mg) at Weeks 0, 4, 8, 12 and one SC injection of etrolizumab-matching placebo at Week 2 during the 14-week Induction Phase. In order to preserve the masking of the dose of etrolizumab, participants will also receive one SC injection of etrolizumab-matching placebo at Weeks 0, 4, 8, and 12.
- Induction Phase - Cohort 3 (Pivotal): Etrolizumab 210 mg (Type: EXPERIMENTAL): Cohort 3 is the last to enroll participants (after Cohort 2) and will be the pivotal cohort for the Induction Phase. Participants randomized to this arm will receive one SC injection of etrolizumab (210 mg) at Weeks 0, 2, 4, 8, and 12 during the 14-week Induction Phase. In order to preserve the masking, participants will also receive one SC injection of etrolizumab-matching placebo at Weeks 0, 4, 8, and 12.
- Induction Phase - Cohort 3 (Pivotal): Etrolizumab 105 mg (Type: EXPERIMENTAL): Cohort 3 is the last to enroll participants (after Cohort 2) and will be the pivotal cohort for the Induction Phase. Participants randomized to this arm will receive one SC injection of etrolizumab (105 mg) at Weeks 0, 4, 8, 12 and one SC injection of etrolizumab-matching placebo at Week 2 during the 14-week Induction Phase. In order to preserve the masking, participants will also receive one SC injection of etrolizumab-matching placebo at Weeks 0, 4, 8, and 12.
- Induction Phase - Cohort 3 (Pivotal): Placebo (Type: PLACEBO_COMPARATOR): Cohort 3 is the last to enroll participants (after Cohort 2) and will be the pivotal cohort for the Induction Phase. Participants randomized to this arm will receive two SC injections of etrolizumab-matching placebo at Weeks 0, 4, 8, and 12 (and one SC injection of etrolizumab-matching placebo at Week 2) during the 14-week Induction Phase, in order to preserve the masking.
- Maintenance Phase - Placebo Responders: Placebo (Type: PLACEBO_COMPARATOR): Participants who received placebo during the Induction Phase (from Cohorts 1 and 3) and achieved a CDAI-70 response at Week 14 will undergo a sham randomization into the Maintenance Phase. Placebo responders from induction will receive blinded maintenance treatment with an SC injection of placebo once every 4 weeks (q4w) from Week 16 to Week 64.
- Maintenance Phase - Etrolizumab Responders: Placebo (Type: PLACEBO_COMPARATOR): Participants who received etrolizumab during the Induction Phase (from Cohorts 1-3) and achieved a CDAI-70 response at Week 14 without the use of rescue therapy will be re-randomized into the Maintenance Phase. Etrolizumab responders from induction who are re-randomized to this arm will receive blinded maintenance treatment with an SC injection of placebo q4w from Week 16 to Week 64.
- Maintenance Phase - Etrolizumab Responders: Etrolizumab 105 mg (Type: EXPERIMENTAL): Participants who received etrolizumab during the Induction Phase (from Cohorts 1-3) and achieved a CDAI-70 response at Week 14 without the use of rescue therapy will be re-randomized into the Maintenance Phase. Etrolizumab responders from induction who are re-randomized to this arm will receive blinded maintenance treatment with an SC injection of etrolizumab (105 mg) q4w from Week 16 to Week 64.

Based on this trial design, predict the completion outcome and termination type (if applicable).