title: [Carcinoma of the lung and multiple primary malignant tumors].
abstract: BACKGROUND
  To evaluate the incidence of multiple primary malignancies combined with lung and other organs and their relationship.
  
  
  METHODS
  All patients who consecutively treated for lung cancer from December 1964 to December 1992, were retrospectively analyzed regarding the recurrence of a synchronous primary tumor elsewhere in the body.
  
  
  RESULTS
  Of total 1019 patients reviewed, 21 (2.1%) had associated carcinoma of other organs. In these 21 patients, the incidence of associated aerodigestive tract cancer was 71.4% (15/21) and that of other organs was 28.6% (6/21). Five patients had simultaneous cancer with the lung cancer and 16 had metachronous cancer.
  
  
  CONCLUSIONS
  Multiple primary tumors in patients with carcinoma of the lungs is not a rare phenomenon. Surveillance programs for detection of second primary tumors should focus on these patients.
authors.affiliation: Department of Thoracic Surgery, General Hospital of Navy, Beijing 100037, P.R.China.
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Liqun
authors.initials: L
authors.lastname: Shang
authors.forename: Xuechang
authors.initials: X
authors.lastname: Li
authors.forename: Zhangyu
authors.initials: Z
authors.lastname: Zhang