Fibroscopy in the evaluation of the efficiency of radiotherapy of cancer of the upper respiratory tract and lymphosarcoma of the throat ring

Proceeding from 2626 fibroscopic examinations of the upper respiratory tract during radiotherapy of 492 cancer patients, the most appropriate time of control endoscopic examinations have been defined. Endoscopic criteria for the evaluation of the efficiency of therapy of primary tumors of different parts of the upper respiratory tract have been determined. The efficiency of radiotherapy by changing endoscopic pictures is most vividly expressed in laryngeal cancer after delivering the dose of 30-40 Gy (49-66 units of TDF), in laryngeal and nasopharyngeal cancer 50 Gy (82 units of TDF) and in lymphosarcoma of the throat ring 20 Gy (33 units of TDF). Tumor regression in concomitant involvement of the tonsils by lymphosarcoma develops not uniformly. A positive time course is first of all noted in lymphadenoid masses: in the palatine and lingual tonsils and then in the pharyngeal, tubal and laryngeal tonsils. Complete tumor regression after irradiation at a dose of 20 Gy (33 units of TDF) is noted in 50% of lymphosarcoma patients. In 13.2% of cases doses of 50 Gy (82 units of TDF) and 60 Gy (99 units of TDF) are required for complete regression of lymphosarcoma of the throat ring