Study of Oxaliplatin, Irinotecan, and S-1 in Gastric Cancer

Study Overview
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Brief Summary
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This study will conduct a phase II study of triple combination with oxaliplatin, irinotecan, and S-1 as the first-line chemotherapy in patients with advanced gastric cancer.

Detailed Description
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It is widely accepted that the efficacy of chemotherapy for patients with inoperable, advanced, and metastatic gastric cancer is better than that compared to best supportive care. In general, combination chemotherapies are more efficient than monotherapy and so it is reasonable to give combination chemotherapy to patients with good performance status. Especially dual combination chemotherapy with fluoropyrimidine and platinum has shown the objective response rate of 25-48% in patients with newly diagnosed advanced metastatic gastric cancer and several studies about triple combination with oxaliplatin, irinotecan, and fluoropyrimidine have shown the response rate of 53 75% but also higher rate of hematologic adverse events. So the investigators had conducted the phase I study of these three drugs with modification of dosage and schedule and will conduct a phase II study with recommended dose of triple chemotherapy from this phase I study.

Official Title
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Phase II Study of S-1 in Combination With Oxaliplatin and Irinotecan in Patients With Advanced, Recurrent or Metastatic Gastric Cancer

Conditions
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Stomach Neoplasm

Intervention / Treatment
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* Drug: Oxaliplatin, Irinotecan, S-1(OIS)


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Pathologically confirmed advanced, recurrent or metastatic adenocarcinoma of stomach (stage IV by primary tumor, regional nodes, metastasis(TNM) staging system) Eastern Cooperative Oncology Group (ECOG) performance status 0-2 More than 3 months expected life span Measurable lesion by RECIST criteria version 1.1 Palliative chemotherapy naive Adequate organ functions Participants must sign an informed consent indicating that they are aware of the investigational nature of the study in keeping with the policy of the hospital Exclusion Criteria: Positive Her2 status on participants' cancer tissue. Any prior 2 years or concurrent malignancy other than non-melanoma skin cancer, in situ cancer of uterine cervix, or papillary or follicular thyroid cancer. Participants who had received radiation therapy for target lesions 4 weeks before study enrollment Participants who had received major surgery 4 weeks before study enrollment Participants with active infection, severe heart disease, uncontrollable hypertension or diabetes mellitus, myocardial infarction during the preceding 12 months, pregnancy, or breast feeding Participants with central nervous system(CNS) metastases Participants with peripheral sensory neuropathies with impaired functional activities Participants with gastrointestinal obstruction or bleeding inducing mal-absorption of oral chemotherapeutic agents.

Ages Eligible for Study
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Minimum Age: 19 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Oxaliplatin, Irinotecan, S-1(OIS)<br>triple combination with oxaliplatin, irinotecan, and S-1. Treatment will be delivered as a 2-week cycle. Oxaliplatin 65 mg/m2 iv on day 1 Irinotecan 135 mg/m2 iv on day 1 S-1 80 mg/m2/day on day 1-7 | Drug: Oxaliplatin, Irinotecan, S-1(OIS)<br>* Treatment will be delivered every 2 weeks oxaliplatin 65 mg/m2 iv on day 1 irinotecan 135 mg/m2 iv on day 1 S-1 80 mg/m2/day po on day 1-7<br>* Other names: Liplatin, Inotecan, TS-1 (tegafur, gimeracil, oteracil);|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| overall response rate | Tumor response will be classified on the basis of the response evaluation criteria in solid tumors (RECIST) guidelines version 1.1 | 1.5 years | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| progression free survival | The progression-free survival (PFS) will be measured from the start of study treatment until documented tumor progression (by RECIST) or death due to any cause | 1.5 years | 
| overall survival | The overall survival (OS) will be estimated from the start of study treatment until participant's death and measured using the Kaplan-Meier method | 1.5 years | 
| Toxicity profiles - The number of participants and grade of intensity of treatment related adverse events | adverse events will be graded using the NCI common terminology criteria for adverse events (NCTCAE) v 4.0 | 1.5 years | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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stomach neoplasm, oxaliplatin, irinotecan, S-1