title: [Effect of a risk of malignancy index in preoperative diagnosis of ovarian cancer].
abstract: OBJECTIVE
  To evaluate the ability of a risk of malignancy index (RMI), based on a serum CA125 level, ultrasound findings and menopausal status, to discriminate a benign from a malignant pelvic mass.
  
  
  METHODS
  One hundred and forty women with a pelvic mass, 30 years or older, admitted between January 1998 and June 1999, were studied. The sensitivity, specificity and positive predictive value of serum CA125 level, ultrasound findings and the menopausal status separately and combined into the RMI, to diagnose ovarian cancer.
  
  
  RESULTS
  RMI was more accurate than any individual criterion in diagnosing cancer. Using a RMI cut-off level of 200 to indicate malignancy, the RMI derived from this data set gave a sensitivity of 87.3%, specificity of 84.4%, and positive predictive value of 82.1%.
  
  
  CONCLUSIONS
  RMI is able to correctly discriminate between malignant and benign pelvic mass. It can be introduced easily into clinical practice to facilitate the selection of patients for primary surgery.
authors.affiliation: Department Obstetric and Gynecology, Peking Union Medical College Hospital, Chinese Academy of Medical Science, Peking Union Medical College, Beijing 100730, China.
authors.forename: S
authors.initials: S
authors.lastname: Ma
authors.forename: K
authors.initials: K
authors.lastname: Shen
authors.forename: J
authors.initials: J
authors.lastname: Lang
mesh_terms: D000328:Adult; D018394:CA-125 Antigen / Q000097:blood*; D005260:Female; D006801:Humans; D010051:Ovarian Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging; D012306:Risk; D014463:Ultrasonography
chemical_list: D018394:CA-125 Antigen