title: [Some aspects of time-dose relationships].
abstract: One hundred thirty-seven patients with non-small cell lung cancers, 57 with oral cavity cancers and 98 with postoperative breast cancers treated with external radiotherapy from 1974 to 1980 were analyzed to determine optimal trends of time-dose relationships. Superiorities of fractionation factors were examined by comparing the relative local recurrence or expire rates among the subgroups prognostically homogenized in each entities of the diseases. Favorable fractionation factors for the former two diseases were those in which treatment was given in shortened over-all times, and frequently with low fraction dose to the considerably high daily dose. These results indicate the superiority of accelerated fractionation regime to conventional one in the treatment of those diseases. In contrast, any optimal trend was not found with postoperative breast cancers but total dose administered more than 43 Gy.
mesh_terms: D001943:Breast Neoplasms / Q000532:radiotherapy / Q000601:surgery; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000532:radiotherapy; D009062:Mouth Neoplasms / Q000532:radiotherapy; D009369:Neoplasms / Q000532:radiotherapy*; D011879:Radiotherapy Dosage; D013997:Time Factors