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Four courses versus eight courses of adjuvant S-1 for patients with stage II gastric cancer (JCOG1104 [OPAS-1]): an open-label, phase 3, non-inferiority, randomised trial

OncologyEsophageal CancerGastrointestinal OncologyGastroenterologyPathologyMedicineRadiation OncologyAdjuvant S-1Cancer ResearchPhase 3