title: Synchronous primary cancers of the head and neck region and upper aero digestive tract: defining high-risk patients.
abstract: BACKGROUND
  Patients with cancers in the head and region are at increased risk of developing synchronous primary cancers.
  
  
  OBJECTIVE
  To see the epidemiology of synchronous cancers of the head and region and identification of high-risk factors for the development of synchronous primary in the head and neck cancers.
  
  
  METHODS
  Data of head and neck cancer patients from January 2010 to December 2011 were obtained from the hospital cancer registry for retrospective analysis of patients with synchronous cancers. All synchronous malignancies were analyzed for distribution of sites, association with smoking history, stage of index head, and neck tumor and the average age of patients at presentation with synchronous cancers. The Chi-square test for association of upper aero digestive tract (UADT) and smoking and statistical formula of median for calculating the average age have been employed for analysis.
  
  
  RESULTS
  Incidence of synchronous primaries has been found to be 1.33%, majority were seen at the oropharynx (39.2%) and 60.7% synchronous occurred at the esophagus, 0.81% of all head and neck cancers developed synchronous primary at the esophagus. Approximately, 65% of all synchronous primaries were in Stage III and Stage IV disease and 88.2% esophageal synchronous had Stage II disease. Association of UADT synchronous cancers with smoking is highly significant, relative risk = 1.95 95% confidence interval for relative risk 1.05-3.64 P = 0.00010981 (P < 0.05) and the average age is 62.4 years in males and 57.8 years in females.
  
  
  CONCLUSIONS
  Patients who are at the high-risk for the development of synchronous primary tumors in the cancers of the head and neck region are patients with oropharyngeal carcinoma, smoking population, patients over the age of 62 years in males, and 57 years in females and in patients with higher staged index tumor.
authors.affiliation: Department of Hospital Based Cancer Registry, Dr. B Borooah Cancer Institute, Guwahati, India.
authors.forename: M
authors.initials: M
authors.lastname: Krishnatreya
authors.forename: T
authors.initials: T
authors.lastname: Rahman
authors.forename: A C
authors.initials: AC
authors.lastname: Kataki
authors.forename: A
authors.initials: A
authors.lastname: Das
authors.forename: A K
authors.initials: AK
authors.lastname: Das
authors.forename: K
authors.initials: K
authors.lastname: Lahkar
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D041981:Gastrointestinal Tract / Q000473:pathology*; D006258:Head and Neck Neoplasms / Q000453:epidemiology* / Q000473:pathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D016609:Neoplasms, Second Primary / Q000453:epidemiology* / Q000473:pathology