title: Type II diabetes mellitus and the incidence of epithelial ovarian cancer in the cancer prevention study-II nutrition cohort.
abstract: BACKGROUND
  Despite consistent associations of type II diabetes mellitus with hormonally related cancers such as breast and endometrium, the relation between type II diabetes mellitus and ovarian cancer risk is unclear.
  
  
  METHODS
  Associations of type II diabetes mellitus status, duration, and insulin use with epithelial ovarian cancer overall, and with serous and nonserous histologic subtypes were examined in the Cancer Prevention Study-II Nutrition Cohort, a prospective study of U.S. men and women predominantly aged 50 years and older. Between 1992 and 2007, 524 incident epithelial ovarian cancer cases were identified among 63,440 postmenopausal women. Multivariable-adjusted relative risks (RR) and 95% confidence intervals (CI) were computed using extended Cox regression to update diabetes status and bilateral oophorectomy status during follow-up.
  
  
  RESULTS
  Type II diabetes mellitus status (RR = 1.05; 95% CI, 0.75-1.46) and duration were not associated with epithelial ovarian cancer risk. Although not statistically significantly different (P(difference) = 0.39), the RR was higher for type II diabetes mellitus with insulin use (RR = 1.28; 95% CI, 0.74-2.24) than for type II diabetes mellitus without insulin use (RR = 0.96; 95% CI, 0.64-1.43). Diabetes seemed to be more strongly associated with nonserous (RR = 1.41; 95% CI, 0.70-2.85) than serous (RR = 0.71; 95% CI, 0.41-1.23) histologic subtypes.
  
  
  CONCLUSIONS
  Type II diabetes mellitus was not associated with risk of epithelial ovarian cancer, although higher risks with nonserous subtypes and among insulin users cannot be ruled out.
  
  
  CONCLUSIONS
  Larger studies are needed to clarify associations of type II diabetes mellitus with or without insulin use with risk of ovarian cancer overall and by histologic subtypes.
authors.affiliation: Epidemiology Research Program, American Cancer Society, 250 Williams Street, NW Atlanta, GA, USA. susan.gapstur@cancer.org
authors.forename: Susan M
authors.initials: SM
authors.lastname: Gapstur
authors.forename: Alpa V
authors.initials: AV
authors.lastname: Patel
authors.forename: W Ryan
authors.initials: WR
authors.lastname: Diver
authors.forename: Janet S
authors.initials: JS
authors.lastname: Hildebrand
authors.forename: Mia M
authors.initials: MM
authors.lastname: Gaudet
authors.forename: Eric J
authors.initials: EJ
authors.lastname: Jacobs
authors.forename: Peter T
authors.initials: PT
authors.lastname: Campbell
mesh_terms: D000077216:Carcinoma, Ovarian Epithelial; D015331:Cohort Studies; D003924:Diabetes Mellitus, Type 2 / Q000188:drug therapy / Q000453:epidemiology* / Q000378:metabolism; D005260:Female; D006801:Humans; D015994:Incidence; D007328:Insulin / Q000008:administration & dosage; D008875:Middle Aged; D009375:Neoplasms, Glandular and Epithelial / Q000453:epidemiology* / Q000378:metabolism / Q000473:pathology; D010051:Ovarian Neoplasms / Q000453:epidemiology* / Q000378:metabolism / Q000473:pathology; D016016:Proportional Hazards Models; D011446:Prospective Studies; D012307:Risk Factors; D011795:Surveys and Questionnaires; D014481:United States / Q000453:epidemiology
chemical_list: D007328:Insulin