Extensive efforts to improve survival for patients with colorectal cancer using adjuvant treatments in addition to radical surgery have long been tried but without success. Recent data from several controlled trials have, however, shown positive results. The collected information from several trials using different chemotherapy schedules indicate that overall survival is improved. The extent of this improvement is not properly known although several centres have considered it to be sufficiently large to merit routine use in certain stages. Likewise, the collected information from several trials using perioperative radiotherapy indicates that the proportion of local recurrences are reduced by about 50% but without any major influence on survival. Most evidence favours additional radiotherapy before surgery rather than after. If proper dose planning is utilized, sufficiently high doses can be given preoperatively without increasing postoperative mortality.