| E.1 Medical condition or disease under investigation | 
| E.1.1 | Medical condition(s) being investigated |  | 
| E.1.1.1 | Medical condition in easily understood language |  | 
| E.1.1.2 | Therapeutic area | Diseases [C] - Digestive System Diseases [C06] | 
| MedDRA Classification | 
| E.1.2 Medical condition or disease under investigation | 
| 
| E.1.2 | Version | 19.1 |  
| E.1.2 | Level | LLT |  
| E.1.2 | Classification code | 10017770 |  
| E.1.2 | Term | Gastric carcinoma |  
| E.1.2 | System Organ Class | 100000004864 |  | 
| E.1.3 | Condition being studied is a rare disease | No | 
| E.2 Objective of the trial | 
| E.2.1 | Main objective of the trial | 
| Compare overall 5-year survival rates in patients surgically treated for advanced gastric adenocarcinoma (T3, T4 and/or N+ and/or with positive cytology), treated either with curative gastrectomy and adjuvant Hyperthermic Intraperitoneal Chemotherapy (HIPEC) (Arm A), or with curative gastrectomy alone (Arm B). |  | 
| E.2.2 | Secondary objectives of the trial | 
| - Compare 3-year and 5-year recurrence-free survival; - Study the incidence of locoregional recurrence and compare locoregional recurrence-free 5-year survival;
 - Assess and compare treatment-related toxicity (Common Terminology Criteria for Adverse Events v4.0);
 - Compare sites of recurrence;
 - Identify prognostic factors of overall 5-year survival and recurrence-free 5-year survival;
 - Compare patients’ quality of life at preoperative time, M3, M6 and M12 and changes of quality of life.
 
 |  | 
| E.2.3 | Trial contains a sub-study | Yes | 
| E.2.3.1 | Full title, date and version of each sub-study and their related objectives | 
| No specific title, date and version : sub-study included in GASTRICHIP protocol. 
 Objective : Compare the incidence of positive peritoneal cytology pre- and post-gastrectomy in two arms of the study (Am A and Arm B), and assess its impact on 5-year survival.
 |  | 
| E.3 | Principal inclusion criteria | 
| -18 < age ≤ 75 years old - White blood cells > 3,500/mm3, neutrophils ≥ 1,500/mm3, platelets ≥ 100,000/mm3
 - Good renal functions, serum creatinine values being < 1.5 mg/dl
 - Performance Status ≤1, Karnofsky Index ≥ 70%
 - Serum bilirubin ≤ 2 mg/dl
 - Having given written informed consent prior to any procedure related to the study.
 - Covered by a Health System where applicable, and/or in compliance with the recommendations of the national laws in force relating to biomedical research
 - Not under any administrative or legal supervision
 Specific to the study
 - Histologically evidenced resectable T3 or T4 gastric adenocarcinoma for which a curative gastrectomy is scheduled, with invasion into the serosa AND/OR lymph node metastasis (determined from data obtained by endoscopic ultrasound and chest, abdomen and pelvis CT scan) AND/OR positive peritoneal cytology (sampled during the preoperative laparoscopy).
 AND/OR
 - Perforated gastric adenocarcinoma
 AND/OR
 - Siewert III adenocarcinoma of the cardia for which a gastrectomy by exclusive abdominal laparotomy is scheduled
 
 |  | 
| E.4 | Principal exclusion criteria | 
| - Prior malignant tumors with detectable signs of recurrence - Gastric stump adenocarcinoma
 - Presence of comorbidities, notably serious chronic diseases or organ failure
 - Any subject in exclusion period of a previous study according to applicable regulations
 - Pregnancy or breastfeeding
 - Females of childbearing age potential not using medically accepted contraceptive measures, as judged by the investigator
 Interfering substance
 - Contraindication to any drug contained in the chemotherapy regimen
 - Life threatening toxicity before surgery
 - Distant metastases (liver, lung. ovaries, etc)
 - Tumoral infiltration of the head or body of the pancreas
 - Patients presenting an adenocarcinoma of the cardia Siewert I or II
 - Existence of macroscopic peritoneal implants
 - Patients with clinically significant ascites (> 500 cc) even if cytology is negative for cancer cells, in the absence of other non-malignant causes of ascites
 
 |  | 
| E.5 End points | 
| E.5.1 | Primary end point(s) |  | 
| E.5.1.1 | Timepoint(s) of evaluation of this end point | 
| 5 years (end of follow-up) |  | 
| E.5.2 | Secondary end point(s) | 
| 1) Recurrence-free survivals (peritoneal recurrence, locoregional recurrence, metastatic recurrence, site of recurrence ) 2) Treatment-related toxicity
 3) Treatment-related mortality
 4) Treatment related morbidity
 5) Quality of life
 |  | 
| E.5.2.1 | Timepoint(s) of evaluation of this end point | 
| 1) 3 years and 5 years 2) During the 60th postoperative days
 3) During the 60th postoperative days
 4) During the 60th postoperative days
 5) At preoperative time, M3, M6 and M12 postoperative
 |  | 
| E.6 and E.7 Scope of the trial | 
| E.6 | Scope of the trial | 
| E.6.1 | Diagnosis | No | 
| E.6.2 | Prophylaxis | No | 
| E.6.3 | Therapy | Yes | 
| E.6.4 | Safety | Yes | 
| E.6.5 | Efficacy | Yes | 
| E.6.6 | Pharmacokinetic | No | 
| E.6.7 | Pharmacodynamic | No | 
| E.6.8 | Bioequivalence | No | 
| E.6.9 | Dose response | No | 
| E.6.10 | Pharmacogenetic | No | 
| E.6.11 | Pharmacogenomic | No | 
| E.6.12 | Pharmacoeconomic | No | 
| E.6.13 | Others | No | 
| E.7 | Trial type and phase | 
| E.7.1 | Human pharmacology (Phase I) | No | 
| E.7.1.1 | First administration to humans | No | 
| E.7.1.2 | Bioequivalence study | No | 
| E.7.1.3 | Other | No | 
| E.7.1.3.1 | Other trial type description |  | 
| E.7.2 | Therapeutic exploratory (Phase II) | No | 
| E.7.3 | Therapeutic confirmatory (Phase III) | Yes | 
| E.7.4 | Therapeutic use (Phase IV) | No | 
| E.8 Design of the trial | 
| E.8.1 | Controlled | Yes | 
| E.8.1.1 | Randomised | Yes | 
| E.8.1.2 | Open | Yes | 
| E.8.1.3 | Single blind | No | 
| E.8.1.4 | Double blind | No | 
| E.8.1.5 | Parallel group | Yes | 
| E.8.1.6 | Cross over | No | 
| E.8.1.7 | Other | No | 
| E.8.2 | Comparator of controlled trial | 
| E.8.2.1 | Other medicinal product(s) | No | 
| E.8.2.2 | Placebo | No | 
| E.8.2.3 | Other | Yes | 
| E.8.2.3.1 | Comparator description | 
| Curative gastrectomy with D1-D2 lymph node dissection alone (without HIPEC with oxaliplatin) |  | 
| E.8.2.4 | Number of treatment arms in the trial | 2 | 
| E.8.3 | The trial involves single site in the Member State concerned | No | 
| E.8.4 | The trial involves multiple sites in the Member State concerned | Yes | 
| E.8.4.1 | Number of sites anticipated in Member State concerned | 20 | 
| E.8.5 | The trial involves multiple Member States | No | 
| E.8.6 Trial involving sites outside the EEA | 
| E.8.6.1 | Trial being conducted both within and outside the EEA | No | 
| E.8.6.2 | Trial being conducted completely outside of the EEA | No | 
| E.8.7 | Trial has a data monitoring committee | Yes | 
| E.8.8 | Definition of the end of the trial and justification where it is not the last
                        visit of the last subject undergoing the trial |  | 
| E.8.9 Initial estimate of the duration of the trial | 
| E.8.9.1 | In the Member State concerned years | 8 | 
| E.8.9.1 | In the Member State concerned months |  | 
| E.8.9.1 | In the Member State concerned days |  |