Please assess the completion status of the following clinical trial:

Trial Title: Study of ONO-4538 in Gastric Cancer

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: QUADRUPLE
- Phase: PHASE2/PHASE3
- Number of Arms: 4.0

Eligibility Criteria:
Inclusion Criteria:~* Patients with unresectable advanced or recurrent gastric cancer (including esophagogastric junction cancer) that has not been treated with the first-line therapy with systemic antitumor agents for advanced or recurrent gastric cancer (including esophagogastric junction cancer)~* Have measurable lesions as defined in RECIST Guideline Version 1.1~* ECOG PS score 0 or 1~* Have a life expectancy of at least 3 months~Exclusion Criteria:~* Have multiple cancers~* Have a current or past history of severe hypersensitivity to any other antibody products~* Patients with any metastasis in the brain or meninx that is symptomatic or requires treatment~* Patients with active, known or suspected autoimmune disease

- Gender: ALL
- Minimum Age: 20 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- ONO-4538 + SOX Therapy Cohort (Part 1) (Type: EXPERIMENTAL): ONO-4538 360 mg solution intravenously for 30 min in every 3 weeks. Oxaliplatin 130 mg/m2 (BSA) solution intravenously for 2 hours once-daily, followed by 20 days off.~Tegafur-gimeracil-oteracil potassium combination drug 40 - 60 mg bid orally in 14 days, followed by 7 days off Each drug will be continued until documented disease progression, discontinuation due to toxicity, withdrawal of consent or the study ends.
- ONO-4538 + CapeOX Therapy Cohort (Part 1) (Type: EXPERIMENTAL): ONO-4538 360 mg solution intravenously for 30 min in every 3 weeks. Oxaliplatin 130 mg/m2 (body surface area) solution intravenously for 2 hours once-daily, followed by 20 days off.~Capecitabine 1200 - 2100 mg bid orally in 14 days, followed by 7 days off. Each drug will be continued until documented disease progression, discontinuation due to toxicity, withdrawal of consent or the study ends.
- ONO-4538 + chemotherapy group (Part 2) (Type: EXPERIMENTAL): With regard to the ONO-4538 + chemotherapy group, either SOX therapy or CapeOX therapy will be selected as the chemotherapy by the investigator or the subinvestigator, taking into account the condition of each subject.~ONO-4538 360 mg solution intravenously for 30 min in every 3 weeks. Oxaliplatin 130 mg/m2 (body surface area) solution intravenously for 2 hours once-daily, followed by 20 days off.~Tegafur-gimeracil-oteracil potassium combination drug 40 - 60 mg bid or Capecitabine 1000 mg/ m2 (body surface area) bid orally in 14 days, followed by 7 days off.~Each drug will be continued until documented disease progression, discontinuation due to toxicity, withdrawal of consent or the study ends.
- Placebo + Chemotherapy group (Part 2) (Type: PLACEBO_COMPARATOR): With regard to the placebo + chemotherapy group, either SOX therapy or CapeOX therapy will be selected as the chemotherapy by the investigator or the subinvestigator, taking into account the condition of each subject.~Placebo solution intravenously for 30 min in every 3 weeks. Oxaliplatin 130 mg/m2 (body surface area) solution intravenously for 2 hours once-daily, followed by 20 days off.~Tegafur-gimeracil-oteracil potassium combination drug 40 - 60 mg bid or Capecitabine 1000 mg/ m2 (body surface area) bid orally in 14 days, followed by 7 days off.~Each drug will be continued until documented disease progression, discontinuation due to toxicity, withdrawal of consent or the study ends.

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