Abstract: |
In patients with primary resectable rectal cancer, a significant improvement in local control and survival can be achieved with the use of adjuvant radiation therapy plus 5-fluorouracil-based chemotherapy. However, it is more difficult to obtain such results for patients with more advanced disease. In patients with locally advanced and recurrent disease, the tumor is virtually always more locally extensive than is indicated by physical and radiographic examinations. This is because of the propensity of these tumors to adhere to or directly invade adjacent organs or vital structures. Therefore, with the exception of a limited suture line recurrence, initial surgery in this group of patients is often approached in a palliative rather than a curative fashion. A major limitation of pelvic external beam radiation therapy is that the dose required to achieve an adequate level of local control, in many cases, exceeds the tolerance of the surrounding normal tissues. In an attempt to overcome this limitation, a number of approaches have been used. The most promising approaches have included intraoperative radiation therapy and pelvic radiation therapy with systemic chemotherapy. Copyright © 2001 by W.B. Saunders Company. |