ITACA-S (Intergroup trial of adjuvant chemotherapy in adenocarcinoma of the stomach) trial: comparison of a sequential treatment with irinotecan (cpt-11) + 5-fluorouracil (5FU)/folinic acid (LV) followed by docetaxel and cisplatin versus a 5-FU/LV regimen as postoperative treatment for radically resected gastric cancer.