Abstract
Radiation plays an important role in the management of patients with non-small-cell carcinoma of the lung. Understanding the impact of radiation on this tumor and on normal tissues requires a knowledge of the natural history of the tumor, and of basic sciences, including radiation physics and biology. This review gives a brief outline of the scientific basis of radiotherapy, followed by a discussion of some practical issues concerning radiation tolerances of tissues within the thorax, the acute and late sequelae of radiation, and the treatment planning process. The role of radiotherapy is explored in the following settings: Radical radiation with curative intent for early stage disease, adjuvant mediastinal irradiation for completely resected tumors, radiation of known residual disease after surgical resection, preoperative radiation, prophylactic cranial radiation, radiation of locally advanced unresectable disease, and, finally, radiation with palliative intent in patients with metastatic disease. Pertinent studies, with the emphasis on randomized trials, are outlined to document the present state of understanding with respect to the impact of radiation in each of these situations. Several of the controversies in this area are addressed, with particular emphasis on selection of patients for high-dose radiation and recent results of combined modality treatment with radiation and chemotherapy.
Résumé
La radiothérapie a un rôle important dans le traitement des cancers pulmonaires (tous les cancers en dehors de ceux à petites cellules). Comprendre l'impact de la radiothérapie sur de telles tumeurs et sur les tissus avoisinants normaux nécessite la connaisance de l'histoire naturelle de la tumeur et des sciences fondamentales touchant à la physique et à la biologie des rayons. Cette revue donne un bref apercu des bases scientifiques de la radiothérapie, suivi de quelques notions pratiques sur la tolérance des tissus à l'intérieur du thorax, les séquelles aiguës et tardives des rayons et les différérents schémas thérapeutiques qu'on peut proposer. Le rôle de la radiothérapie est expliqué dans les situations suivantes: irradiation radicale avec intention curative en cas de tumeur au début, radiothérapie adjuvante du médiastin après résection complète des tumeurs, irradiation de tissus tumoraux après résection incomplète, radiothérapie préopératoire, irradiation prophylactique du crâne, irradiation des tissus non résecables, ainsi que irradiation avec intention palliative chez de patients ayant des métastases. Des études pertinentes, et surtout des études randomisées, sont soulignées pour comprendre le rôle des irradiations dans chacune de ces situations. Plusieurs controverses sont exposées, en insistant sur la sélection des patients pouvant recevoir de hautes doses de radiothérapie et les résultats de la radiothérapie combinée avec la chimiothérapie.
Resumen
La irradiación ocupa un lugar importante en el manejo de los pacientes con carcinoma pulmonar de células no pequenas. Se requière un buen conocimiento de la historia natural del tumor y de las ciencias básicas, incluso de la física de la radiación y de la biología, para la debida comprensión de los efectos de la radiación sobre tumores y sobre tejidos normales. La presente revisión incluye un bosquejo de las bases científicas de la radioterapia, y a continuación se discuten algunos aspectos prácticos de la tolerancia a la irradiación por parte de los tejidos intratorácicos, las secuelas agudas y a largo término de la irradiación y, por último, el proceso de planeación de la terapia. Se analiza el papel de la radioterapia en diversas situaciones clínicas: radioterapia radical con propósito de curación para tumores en estadios tempranos, radioterapia mediastinal coadyuvante en casos de resección compléta del tumor, irradiación de enfermedad residual luego de la resección quirúrgica, irradiación preoperatoria, irradiacción profiláctica del cráneo, irradiación de enfermedad local avanzada y no resecable y, finalmente, irradiación palíativa en pacientes con metástasis. Se resumen los estudios clínicos pertinentes, con énfasis en los ensayos randomizados, con el objeto de documentar el estado actual del conocimiento sobre el impacto de la radioterapia en cada una de tales situaciones clínicas, enfocando los aspectos que son motivo de controversia, especialmente en cuanto a la seleccíon de pacientes para irradiación de alta dosis y a los resultados con la modalidad de radio y quimioterapias combinadas.
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Bezjak, A., Payne, D. Radiotherapy in the management of non-small-cell lung cancer. World J. Surg. 17, 741–750 (1993). https://doi.org/10.1007/BF01659084
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DOI: https://doi.org/10.1007/BF01659084