[Retrospective multicenter study on carcinomas of the lips and oral cavity. The role of multiple malignancies].

In a retrospective multicenter study the role of multiple cancer has been assessed in 2481 patients with carcinomas of the lips and oral cavity. In 3.2% of the cases the malignancies developed outside the maxillofacial area. In the majority of cases two malignant neoplasms were found. Most of them were histologically carcinomas. The bronchi and stomach were common localizations in patients with lip carcinomas, whereas patients with oral carcinomas exhibited mainly cancers of the breast, stomach and uterus. Sex-limited multiple cancers associated with oral carcinoma occurred predominantly in women. Surgery is the most common form of treatment. The prognosis for patients with lip carcinomas is significantly poorer when multiple cancers are present.