RADIOTHERAPY AND COMBINED CHEMORADIOTHERAPY OF RECTAL-CANCER

During the last twenty years radiotherapy has been more frequently int egrated with conventional demolitive surgery of rectal cancers because radical surgery, the treatment of choice of these tumors, has achieve d a plateau of therapeutic results in the various stages of disease. T he incidence of pelvic failures in stages B2 and C remains high, despi te apparently complete resections. Disease-free interval, quality of l ife and survival are negatively affected. Radiotherapy at doses of abo ut 50 Gy is able to destroy subclinical foci of disease after surgery (post-operative radiotherapy) or to reduce volume and infiltration of a locally extended tumor facilitating surgery (pre-operative radiother apy). Moreover, radiotherapy proved to be effective in the treatment o f pelvic recurrences. The great improvement of radiotherapeutic techni ques in the last decade allows treatments at high doses to the target, minimizing the risk of side effects to contiguous normal tissues. A l arge number of clinical studies seems to demonstrate that the efficacy of radiotherapy is enhanced by combining chemotherapy both in the pre -operative approach and in the post-operative adjuvant treatment, To d ate, no definitive agreement about the optimal schedules of combined c hemo-radiotherapy has been achieved. Many controlled studies are in pr ogress investigating the most effective schedules with the minimal tox icity. The main indications of radiotherapy in the treatment of rectal cancer are here synthetically presented, Pros and cons of each approa ch are illustrated according to updated reports. For wider information on this topic of great interest and in progress the consultation of s ome reviews is suggested (1, 3, 23).