Docetaxel+Oxaliplatin+S-1 (DOS) Regimen as Neoadjuvant Chemotherapy in Advanced Gastric Cancer

A Phase III, Open-labelled, Randomised Study of Neoadjuvant Docetaxel+Oxaliplatin+S-1 (DOS) + Surgery + Adjuvant S-1 Versus Surgery + Adjuvant S-1 in Patients With Resectable Advanced Gastric Cancer

Primary Objective:

- To compare the 3-year progression free survival (PFS) in the two treatment arms.

Secondary Objectives:

• Overall survival (OS).
• Postoperative pathological stage and R0 (complete) resection rate.
• Safety: Toxicities associated with neoadjuvant chemotherapy, surgery, morbidity/mortality, toxicity of adjuvant chemotherapy.

Participants in the neoadjuvant chemotherapy arm were treated for 3 cycles (1 cycle is 21 days) before surgery and treated for a year with S-1. Participants in the adjuvant chemotherapy arm underwent surgery and were treated for a year with S-1. All participants were followed during and after the study treatment until death or disease progression, whichever comes first.

Inclusion criteria :

• Participants with new histologically confirmed, newly diagnosed, localized gastric or gastro-oesophageal adenocarcinoma, that is considered resectable.
• Participants with clinical stage (T2-3/N(+), T4/N(+/-):N positive means greater than or equal to [>=] 8 in hour axis).
• Signed informed consent.

Exclusion criteria:

• Aged less than (<) 20 years or >= 76 years. Performance status >=2 in Eastern Cooperative Oncology Group (ECOG) scale
• The participants who had the history of other malignancy within the last five years except cured basal cell carcinoma of skin and carcinoma in situ of uterine cervix which had been already successfully treated.
• Previous surgery on neoplasm of stomach.
• Participants who did not completely recovered from surgery.
• Distant metastases (M1) to other organs including distant nodal groups (retropancreatic, para-aortic, portal, retroperitoneal, mesenteric node). severe/unstable angina, coronary artery bypass graft, congestive heart failure, transient ischemic attack within 6 months prior to enrollment in the study.
• Any previous palliative, adjuvant or neoadjuvant chemotherapy and/or radiotherapy and/or immunotherapy, for the currently treated gastric cancer.
• Participants with active infection or sepsis.
• Intolerance of oral taking or malabsorption: lack of physical integrity of the upper gastrointestinal tract or those who have malabsorption syndrome likely to influence absorption of S-1. Ileus, chronic inflammatory intestinal disease or extensive resection of the small intestine and other disorders which limit drug resorption. This includes gastric dumping syndrome, indications of accelerated passage through the small intestine and indications of resorption disorders after intestinal surgery.
• Greater than or equal to grade 2 severe tumour haemorrhage.
• Simultaneous participation in another study, or participation in another study within 4 weeks of commencement of this study.
• Pregnant or lactating participants.

The above information was not intended to contain all considerations relevant to a participant's potential participation in a clinical trial.