title: Clinical studies on 56 cases of oral malignant tumor.
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D005260:Female; D006801:Humans; D007564:Japan; D007972:Leukoplakia, Oral; D008297:Male; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000453:epidemiology; D012737:Sex Factors