Abstract
The appropriate role for additional radiotherapy in patients with resectable rectal cancer is not yet settled. Irradiation has been considered by surgeons and radiotherapists as superfluous since no effect on survival has been shown. However, numerous trials have demonstrated that perioperative radiotherapy decreases an often high local recurrence rate while others believe it has a definite place in routine management. Several surgeons have, on the contrary, claimed that a skilled surgeon compared to a less skilled surgeon, will get the same acceptably low local recurrence rates. Since we will probably never have a randomized trial comparing “good” and “bad” surgeons, this argument cannot be settled. A further obstacle arises in the difficulty of persuading surgeons to organize their routine work so that it is performed in an optimal way by those specializing in this field. The question also arises whether radiotherapy should be delivered pre-operatively, postoperatively or as a “sandwich” technique, i.e., both pre-operatively and postoperatively. According to radio-biological considerations and results from reported trials, the best effect on local tumor control has been achieved using pre-operative radiotherapy.
Résumé
La place de la radiothérapie adjuvante chez les patients ayant un cancer du rectum reste discutée. La radiothérapie est estimée “superflue” par certains chirurgiens et radiothérapeutes car aucun bénéfice n'a eté clairement démontré en ce qui concerne la survie. De nombreux essais cliniques ont indiqué, cependant, que la radiothérapie périopératoire diminuait le taux habituellement élevé des récldives locales, et certains estiment que la radiothérapie a toujours une place dans le schéma thérapeutique. D'autres, au contraire, croient que la quialité et l'expérience de l'opérateur influencent directement le taux de récidives, et équivalent l'efficacité de la radiothérapie. Puisqu'il est peu probable qu'on réalise une étude randomisée entre les “bons” et les “mauvais” chirurgiens, on ne peut régler cette querelle. Un autre obstacle incontournable semble être de persuader les chirurgiens d'organiser leur travail de façon à ce que cette chirurgie soit faite par des spécialistes. Le meilleur moment pour réaliser la radiothérapie (préopératoire, postopératoire, ou les deux) reste à déterminer. Selon les données radiobiologiques et les résultats des essais contrôlés, il semble que le meilleur contôle sur les récidives locales soit obtenu par la radiothérapie préopératoire.
Resumen
Aún no se ha defindo la indicación apropriada para radioterapia adicional en pacientes con cáncer rectal. La irradiación ha sido considerada como superflua por cirujanos y radioterapeutas, puesto que no se ha demostrado efecto sobre la sobrevida. Sin embargo, numerosos ensayos clínicos han demostrado que la radioterapia perioperatoria disminuye la que con frecuencia es una elevada tasa de recurrencía local, mientras ostros creen que tiene un lugar definido en el manejo rutinario. Por el contrario, varios cirujanos han planteado que un cirujano hábil comparado con uno menos hábil, logra las mismas aceptables tasas de recurrencia, alg que jamás se ha decidido, puesto que nunca habremos de realizar ensayos comparando “buenos” cirujanos con “malos” cirujanos. Un obstáculo adicional surge de la dificultad en cuanto a persuadir a los cirujanos de organizar su trabajo rutinario de tal manera que sea realizado en forma óptima por aquellos que se especializan en este campo. También ha surgido el interrogante sobre si la radioterapia debe ser administrada preoperatoriamente, postoperatoriamente o como técnica de “sandwich,” o sea tanto pre como postoperatoriamente. Según consideraciones radio-biológicas y los resultados de los ensayos clínicos, el mejor efecto sobre el control local del tumor ha sido logrado mediante el uso de radioterapia preoperatoria.
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Påhlman, L., Glimelius, B. Pre-operative and post-operative radiotherapy and rectal cancer. World J. Surg. 16, 858–865 (1992). https://doi.org/10.1007/BF02066982
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DOI: https://doi.org/10.1007/BF02066982