[Prevention of cancer of the buccal mucosa].

Cancer of the buccal mucosa ranks fourth in the structure of cancers. Pretumor processes of the buccal mucosa are Bouin's disease, leukoplakia verrucosa, papillomatosis, erosive ulcerative and hyperkeratotic lupus erythematosus and lichen planus, and postradiation stomatitis. Two clinical cases of cancer of the tongue in young men aged 27 years are described.

[Autofluorescence diagnosis of malignant tumors of the head and neck].

A new method for diagnosing human malignant tumors is dealt with, which is based on fluorescence of malignant neoplasms and their adjacent normal tissue. To measure the fluorescence spectra, a fiber optic system and a multi-channel optic spectral analyser have been designed. While analysing the resultant spectra, a greater fluorescence excess was observed in the red wave band in the tumors than in normal tissue.

[The cryodestruction of cancer of the lower lip].

The authors review the results of cryogenic treatment of the lower lip cancer and its recurrences in 212 patients for 1973-1989. The technique of cryodestruction is analysed. It is found that the best results were achieved at the disease stage I-II and local cancer relapses after radiation treatment.