Adjuvant chemotherapy after curative resection was offered to patients under 75 years of age with stage III colon cancer, according to the Norwegian Guidelines for Colorectal Cancer21 and the German guidelines of the Program in Oncology.22 Patients between 70 and 75 years old received routine monotherapy, either 5-flurouracil (5-FU) or capecitabine (Xeloda). Patients under 70 years of age were routinely offered XELOX in case of N1 stage (6 cycles of capecitabine + oxaliplatin) or XELOX/FOLFOX/FLOX in case of N2 stage (12 cycles of either capecitabine or 5-flurouracil combined with oxaliplatin).
Stages I/II (SS1) or RS1/RS2 were routinely not given adjuvant chemotherapy treatments,21,22 with the following exceptions:
In this substudy, there were no perioperative tumor perforations or upstaging because of tumor deposits in the histopathological findings.
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