title: [A retrospective clinical study of 6539 cases of malignant oral-maxillofacial tumors].
abstract: OBJECTIVE
  The aim of this study is to obtain the general information of post-operation malignant oral-maxillofacial tumor patients in forty-seven years.
  
  
  METHODS
  A total of 6539 patients with malignant oral-maxillofacial tumors in the hospital of stomatology, west china university of medical sciences, from 1953 to 2000 were retrospected.
  
  
  RESULTS
  The average age of patients with malignant oral-maxilloficial tumor is 48.7 years old. The ratio of male to female is 2.31:1. The most common original malignant tumors in this oral-maxillofacial region are malignant oral tumors, malignant maxillary tumors, malignant mandibular tumors, and malignant sialoma successively. As to the original tissues of tumors, there were 5869 cases of epithelial tumors, and made up 89.75% of all the investigated patients. Tumors came from lymphatic and hematopoietic systems and mesoderm were much less those came from epithelia. There were 4177 cases of squamous cell carcinomas and the percentage was 63.88%.
  
  
  CONCLUSIONS
  The incidence rate of malignant tumors in oral-maxillofacial region tends to increase, and the average age of patients also rose. The ratio of male to female decreases gradually. Epithelial tumors, especially squamous cell carcinomas are very common tumors happening in this region.
authors.affiliation: Department of Oral and Maxillofacial Surgery, College of Stomatology, West China University of Medical Scienses.
authors.forename: Y
authors.initials: Y
authors.lastname: Wen
authors.forename: X
authors.initials: X
authors.lastname: Dai
authors.forename: C
authors.initials: C
authors.lastname: Wang
authors.forename: L
authors.initials: L
authors.lastname: Li
authors.forename: F
authors.initials: F
authors.lastname: Fu
authors.forename: X
authors.initials: X
authors.lastname: Wang
authors.forename: X
authors.initials: X
authors.lastname: Tang
authors.forename: H
authors.initials: H
authors.lastname: Liu
authors.forename: C
authors.initials: C
authors.lastname: Hua
authors.forename: J
authors.initials: J
authors.lastname: Pan
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002294:Carcinoma, Squamous Cell / Q000473:pathology*; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007573:Jaw Neoplasms / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000473:pathology*; D012189:Retrospective Studies; D012468:Salivary Gland Neoplasms / Q000473:pathology*