Risk of familial breast cancer is not increased after pregnancy

Research output: Contribution to journalArticle


Risk of breast cancer is temporarily elevated shortly after pregnancy and the available limited data suggest that a family history of breast cancer may reinforce the risk. We used the nation-wide Swedish Family-Cancer Database to estimate the relative risk (RR) for invasive breast cancer following childbirth among women with or without a family history. The RRs were defined using Poisson regression model of person-years as offset, adjusted for age, period and age at first childbirth. For women without a family history, RRs for breast cancer showed a U-shaped pattern after last pregnancy. Among the 5,217 patients with a first-degree family history the familial risk was 1.77; there was no evidence of increased RRs immediately after last pregnancy. The present study is by far the largest one published on the theme. It shows that pregnancy is not an additional risk factor for women with a family history.


External organisations
  • German Cancer Research Centre
  • Karolinska Institutet
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Cancer and Oncology


  • Familial breast cancer, Heredity, Parity, Pregnancy
Original languageEnglish
Pages (from-to)417-420
Number of pages4
JournalBreast Cancer Research and Treatment
Issue number3
Publication statusPublished - 2008 Apr 1
Publication categoryResearch
Externally publishedYes