Tislelizumab in Combination With Pre-operative CRT Versus... | NCT05687357

Status Module

Description Module

Arms/Interventions Module

Arm Groups

Label	Type	Description	Intervention Names
Arm A: Tislelizumab + Chemoradiotherapy	Experimental	Neoadjuvant: Prior to surgery, participants receive 4 cycles of Tislelizumab 200 mg via intravenous (IV) infusion on C1D1, C2D1, C2D22, C3D1 PLUS radiotherapy (TOMO or VMAT) 45Gy/1.5f PLUS S-1 initial dose depends on the body surface area, PO, bid, C1D1~D14，C2D1~C2D5, C2D8~C2D12, C2D15~C2D19, C2D22~C2D26, C2D29~C2D33, C3D1~D14 and oxaliplatin 130mg/m^2, IV, C1D1 and C3D1 OR S-1 initial dose depends on the body surface area, PO, bid, C1D1~D14，C3D1~D14 and nab-paclitaxel, IV 100~120mg/m^2，IV，C1D1，C1D8，C2D1，C2D8，C2D16，C2D22，C3D1 and C3D8. Adjuvant: 4 to 10 weeks post-surgery, participants receive 3 cycles of SOX OR S-1 and nab-paclitaxel AND 3 cycles of S-1, AND up to 16 cycles of Tislelizumab 200 mg via IV infusion on Day 1 Q3W.	Drug: Tislelizumab Drug: S-1 Drug: Oxaliplatin Drug: Nab paclitaxel Radiation: Radiation
Arm B: Chemoradiotherapy	Active Comparator	Neoadjuvant: Prior to surgery, participants receive radiotherapy (TOMO or VMAT) 45Gy/1.5f PLUS S-1 initial dose depends on the body surface area, PO, bid, C1D1~D14，C2D1~C2D5, C2D8~C2D12, C2D15~C2D19, C2D22~C2D26, C2D29~C2D33, C3D1~D14 and oxaliplatin 130mg/m^2, IV, C1D1 and C3D1 OR S-1 initial dose depends on the body surface area, PO, bid, C1D1~D14，C3D1~D14 and nab-paclitaxel, IV 100~120mg/m^2，IV，C1D1，C1D8，C2D1，C2D8，C2D16，C2D22，C3D1 and C3D8. Adjuvant: 4 to 10 weeks post-surgery, participants receive 3 cycles of SOX OR S-1 and nab-paclitaxel AND 3 cycles of S-1.	Drug: S-1 Drug: Oxaliplatin Drug: Nab paclitaxel Radiation: Radiation
Arm C: Chemotherapy	Active Comparator	Neoadjuvant: S-1 initial dose depends on the body surface area, PO, bid, D1~D14，Q 3W for 6 cycles, and oxaliplatin 130mg/m^2, IV, D1 of each cycle for 6 cycles OR nab-paclitaxel, IV 100~120mg/m^2，IV，D1 and D8 for each cycle for 6 cycles. Adjuvant: 4 to 10 weeks post-surgery, participants receive 3 cycles of SOX OR S-1 and nab-paclitaxel AND 3 cycles of S-1.

Name	Type	Description	Arm Group Labels	Other Names
Tislelizumab	Drug	IV infusion	Arm A: Tislelizumab + Chemoradiotherapy

Outcomes Module

Primary Outcomes

Measure	Description	Time Frame
Pathological Complete Response (pathCR) Rate	PathCR rate is defined as the percentage of participants having a pathCR. pathCR is defined as no invasive disease within an entirely submitted and evaluated gross lesion, and histologically negative nodes.	Up to approximately 22 weeks

Secondary Outcomes

Measure	Description	Time Frame
Event-free Survival (EFS) Per Response Criteria in Solid Tumors Version 1.1 (RECIST 1.1)	EFS is based on RECIST 1.1 as assessed by the investigator and is defined as the time from randomization to the first of the following events: radiographic disease progression per RECIST 1.1; local or distant recurrence as assessed by CT scan or biopsy if indicated (for participants who are disease free after surgery); clinical progression as evidenced by peritoneal carcinomatosis confirmed by preoperative laparoscopy or laparotomy (for participants who are confirmed to be free of peritoneal involvement by laparoscopy at screening); or death due to any cause. A second primary malignancy, or radiographic progressive disease (PD) during the neoadjuvant phase that does not preclude successful surgery (i.e., disease free after surgery), are not considered EFS events.

Eligibility Module

Eligibility Criteria

Inclusion Criteria:

Has previously untreated localized gastric or GEJ adenocarcinoma as defined by T3~4aN+M0 or T4bNanyM0 （AJCC Version 8）
Has an Eastern Cooperative Oncology Group (ECOG) performance status score of 0 to 1
Has adequate organ function.
Male participants of childbearing potential must agree to use an adequate method of contraception for the course of the study through 180 days after the last dose of chemotherapy.
Female participants of childbearing potential must be willing to use an adequate method of contraception for the course of the study through 180 days after the last dose of chemotherapy or through 120 days after the last dose of pembrolizumab, whichever is greater.

Exclusion Criteria:

Has a known additional malignancy that is progressing or has required active treatment within the past 5 years. Note: Participants with basal cell carcinoma of the skin, squamous cell carcinoma of the skin, or carcinoma in situ that have undergone potentially curative therapy are not excluded.
Has received prior systemic anti-cancer therapy including investigational agents for the current malignancy.
Has an active infection requiring systemic therapy.
Has a history of (non-infectious) pneumonitis that required steroids or has current pneumonitis.
Is currently participating in or has participated in a trial of an investigational agent or has used an investigational device within 4 weeks prior to the first dose of study treatment.
Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 14 days prior the first dose of study treatment.
Has an active autoimmune disease that has required systemic treatment in past 2 years.
Has a known history of human immunodeficiency virus (HIV) infection.
Has a known history of Hepatitis B or known active Hepatitis C virus infection (HBsAg positive with HBV DNA≥500 IU/ml；HCV：HCV antigen positive with HCV copies >ULN).
Has had an allogenic tissue/solid organ transplant.
Has received a live vaccine within 30 days prior to the first dose of study treatment.
Female participants who are breastfeeding.

ID	Term
D005770	Gastrointestinal Neoplasms
D004067	Digestive System Neoplasms
D009371	Neoplasms by Site
D009369	Neoplasms
D004066	Digestive System Diseases
D005767	Gastrointestinal Diseases
D013272	Stomach Diseases

ID	Term
C000707970	tislelizumab
C079198	S 1 (combination)
D000077150	Oxaliplatin
D013660	Taxes
D011827	Radiation

ID	Term
D056831	Coordination Complexes
D009930	Organic Chemicals
D004467	Economics
D004472	Health Care Economics and Organizations
D055585	Physical Phenomena