Risk factors for epithelial ovarian tumours of borderline malignancy

F. Parazzini, C. Restelli, C. La Vecchia, E. Negri, S. Chiari, R. Maggi, C. Mangioni

Research output: Contribution to journalArticlepeer-review


A case-control study was conducted on 91 cases with histologically-confirmed borderline ovarian tumours and 237 control subjects in hospital for acute non-gynaecological, hormonal or neoplastic disease. Women reporting three or more births, compared to nulliparae, had a relative risk (RR) estimate of 0.6, but this finding was not statistically significant (95% confidence interval (CI): 0.2-1.4). The risk of borderline tumours increased, although not significantly, with later age at first birth: compared to women reporting first birth at age 24 or before, the RRs were 1.3 and 1.7 in those reporting respectively their first birth at age 25-29 and 30 years or more. No significant relationship emerged between borderline ovarian cancer and age at menarche, menopausal status and lifelong menstrual pattern. Cases tended to report a later age at menopause than controls, but the trend in risk was not statistically significant. Nine cases (9.9%) and 68 controls (24.9%) reported oral contraceptive use: compared with never users the multivariate RR for ever users was 0.3, and the risk dropped with duration of use to 0.2 in users for two years or more (X21 trend = 12.70, p

Original languageEnglish
Pages (from-to)871-877
Number of pages7
JournalInternational Journal of Epidemiology
Issue number4
Publication statusPublished - 1991

ASJC Scopus subject areas

  • Epidemiology
  • Statistics, Probability and Uncertainty
  • Applied Mathematics
  • Physiology (medical)
  • Reproductive Medicine
  • Obstetrics and Gynaecology


Dive into the research topics of 'Risk factors for epithelial ovarian tumours of borderline malignancy'. Together they form a unique fingerprint.

Cite this