Patients with clinical stage II or III rectal cancer who were undergoing preoperative RT ( @ Gy in @ fractions over @ weeks plus a boost of @ Gy to @ Gy in three to six daily fractions ) were randomly assigned to one of the following chemotherapy regimens : continuous intravenous infusional fluorouracil ( CVI FU ; @ mg/m ( @ ) , @ days per week ) , with or without intravenous oxaliplatin ( @ mg/m ( @ ) once per week for @ weeks ) or oral capecitabine ( @ mg/m ( @ ) twice per day , @ days per week ) , with or without oxaliplatin ( @ mg/m ( @ ) once per week for @ weeks ) .