Background Advanced gastric cancer can respond to S-1, an oralfluoropyrimidine. We tested S-1 as adjuvant chemotherapy inpatients with curatively resected gastric cancer.
Methods Patients in Japan with stage II or III gastric cancerwho underwent gastrectomy with extended (D2) lymph-node dissectionwere randomly assigned to undergo surgery followed by adjuvanttherapy with S-1 or to undergo surgery only. In the S-1 group,administration of S-1 was started within 6 weeks after surgeryand continued for 1 year. The treatment regimen consisted of6-week cycles in which, in principle, 80 mg of oral S-1 persquare meter of body-surface area per day was given for 4 weeksand no chemotherapy was given for the following 2 weeks. Theprimary end point was overall survival.
Results We randomly assigned 529 patients to the S-1 group and530 patients to the surgery-only group between October 2001and December 2004. The trial was stopped on the recommendationof the independent data and safety monitoring committee, becausethe first interim analysis, performed 1 year after enrollmentwas completed, showed that the S-1 group had a higher rate ofoverall survival than the surgery-only group (P=0.002). Analysisof follow-up data showed that the 3-year overall survival ratewas 80.1% in the S-1 group and 70.1% in the surgery-only group.The hazard ratio for death in the S-1 group, as compared withthe surgery-only group, was 0.68 (95% confidence interval, 0.52to 0.87; P=0.003). Adverse events of grade 3 or grade 4 (definedaccording to the Common Toxicity Criteria of the National CancerInstitute) that were relatively common in the S-1 group wereanorexia (6.0%), nausea (3.7%), and diarrhea (3.1%).
Conclusions S-1 is an effective adjuvant treatment for EastAsian patients who have undergone a D2 dissection for locallyadvanced gastric cancer. (ClinicalTrials.gov number, NCT00152217
[ClinicalTrials.gov]
.)
Source Information
From Kitasato University School of Medicine, Sagamihara (S.S.); National Cancer Center Hospital (M.S.), the Cancer Institute Hospital (T.Y., T.N.), Nihon University School of Medicine (M.F.), University of Tokyo (Y.O.), and Tokyo Metropolitan Komagome Hospital (K.A.) — all in Tokyo; National Cancer Center Hospital East, Kashiwa (T.K.); Niigata Cancer Center Hospital, Niigata (A.N.); Sakai City Hospital, Sakai (H.F., H.I.); Osaka City General Hospital, Osaka (M.H.); Aichi Cancer Center Hospital, Nagoya (Y.Y.); and National Hospital Organization Shikoku Cancer Center, Matsuyama (A.K.) — all in Japan.
Address reprint requests to Dr. Sakuramoto at the Department of Surgery, Kitasato University School of Medicine, 2-1-1 Asamizodai, Sagamihara, Kanagawa 228-8520, Japan, or at sakura{at}med.kitasato-u.ac.jp.
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