Protocol of OGSG 1901 a phase II trial of ramucirumab plus irinotecan for patients with early relapsed gastric cancer during or after adjuvant docetaxel plus S − 1 therapy

Sequential Treatment Strategy Using Fluoropyrimidine plus Bevacizumab Followed by Oxaliplatin for Metastatic Colorectal Cancer A Phase II Study (OGSG 1107)

Three-year outcomes of a phase Ⅱ study of adjuvant chemotherapy with S-1 plus docetaxel for stage Ⅲ gastric cancer after curative D2 gastrectomy

Randomized, Open-Label Phase II Study Comparing Capecitabine- Cisplatin Every 3 Weeks with S-1-Cisplatin Every 5 Weeks in Chemotherapy-Naïve Patients with HER2-Negative Advanced Gastric Cancer: OGSG1105, HERBIS-4A Trial

Trastuzumab With S-1 Plus Cisplatin in HER2-positive Advanced Gastric Cancer Without Measurable Lesions: OGSG 1202

高度リンパ節転移を伴う進行胃癌に対する術前カペシタビン＋ シスプラチン療法第Ⅱ相臨床試験（OGSG1401)

Phase II study of 5‑fluorouracil–leucovorin plus bevacizumab for chemotherapy‑naïve older or frail patients with metastatic colorectal cancer (OGSG 0802)

First-line single-agent panitumumab in frail elderly patients with wild-type RAS unresectable colorectal cancer: a phase II study protocol OGSG 1602

A Phase II Study of Perioperative Capecitabine Plus Oxaliplatin Therapy for Clinical SS/SE N1-3 M0 Gastric Cancer (OGSG 1601)

A phase II study of S‑1 therapy for patients with advanced and recurrent esophageal cancer resistant or intolerable to fluorouracil, platinum, and taxane therapy (OGSG 1404)