Breast cancer and combined oral contraceptives: An Italian case-control study

Carlo La Vecchia, Fabio Parazzini, Eva Negri, Peter Boyle, Antonella Gentile, Adriano Decarli, Silvia Franceschi

Research output: Contribution to journalArticle

Abstract

The risk of breast cancer in relation to use of oral contraceptives was evaluated using data from a hospital-based case-control study from Northern Italy on 1517 cases below age 60 and 1351 controls admitted for acute diseases unrelated to any of the known or potential risk factors for breast cancer. The multivariate relative risk for ever vs. never users was 1.3 (95% confidence interval = 1.0-1.7). However, the risk was not related to duration of use: indeed the highest risk was observed among short-term users (

Original languageEnglish
Pages (from-to)1613-1618
Number of pages6
JournalEuropean Journal of Cancer and Clinical Oncology
Volume25
Issue number11
DOIs
Publication statusPublished - 1989

ASJC Scopus subject areas

  • Oncology

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