A clinical study of multiple primary cancers in patients with oral cancer.

Metachronous Multiple Carcinoma of Lip After Surgery for Gingival Carcinoma. A Case Report.

“…Uchida et al 10) investigated the onset of multiple carcinoma of the oral cavity and reported that the onset is higher in the oral cavity than in other parts of the body and that ectopic irritants are involved. Nomura et al 6) suggested that smokers, drinkers, and ALDH 2-deficient patients who consume alcoholic beverages are at a risk for developing oral cavity cancer.…”