[Photon or electron irradiation of the internal breast lymph node chain. Experimental dosimetry and clinical implications].

The radiation therapy of internal mammary chain, according to many other authors, is indicated in patients with N + breast cancer or with inner quadrant disease. Since the direct field with gamma radiation seems to induce important adverse effects on myocardium, the authors were induced to check experimentally dose distributions of 12-15 MeV electron beams and compare the results to gamma photon dose distribution. Materials and dosimetric methods as well as experimental results are described. Moreover theoretic and practical point of view are discussed coming to the conclusion that electron beams are more suitable for myocardial saving. Nevertheless some technical variations are required, to maintain the typical homogeneity of photon beams.