[Local recurrences in keratoid squamous cell carcinomas of the oral cavity: incidence, causes and therapy after a curative primary treatment (author's transl)].

The frequency of local recurrences in keratoid squamous cell carcinomas of the oral cavity is analyzed in view of the following criteria: Irradiation technique, volume of the primary tumor, irradiation parameters considering the factor of dose and time. The values of the dose, measured by ret, were calculated using the Ellis-formula modified by Gabriel-Jürgens et al. A focal dose of 1,700 ret is recommended for Stage T1 carcinomas of the tongue, a dose of 1,900 ret for the stages T2 and T3. The importance of the concept of nominal standard dose is emphasized with regard to its clinical application. Surgery seems to be superior to the renewal of radiation therapy in the treatment of recurrences.