title: [An observation of change in serum angiotensin-converting enzyme activity in patients with lung cancer.].
abstract: BACKGROUND
  To study the activity of serum angiotensin-converting enzyme (SACE) in patients with lung cancer and its changes after chemotherapy.
  
  
  METHODS
  The activity of SACEwas detected by ultraviolet method.
  
  
  RESULTS
  The activity of SACE in lung cancer group was significantly lower than that in pneumonia and control groups ( P < 0. 01) . The level of SACE after chemotherapy was remarkably higher than that before chemotherapy ( P < 0. 01) .
  
  
  CONCLUSIONS
  The detection of activity of SACE may be helpful to differentiate malignant from benign pulmonary diseases and to monitor prognosis in patients with lung cancer.
authors.affiliation: Department of Respiratory Diseases , Bethune International Peace Hospital , Shijiazhuang , Hebei 050082 , P. R. China.
authors.forename: G
authors.initials: G
authors.lastname: Yang
authors.forename: M
authors.initials: M
authors.lastname: Gao
authors.forename: Y
authors.initials: Y
authors.lastname: Chen
authors.forename: Y
authors.initials: Y
authors.lastname: Zhou