Pregnancy related protection against breast cancer depends on length of gestation

L J Vatten; P R Romundstad; D Trichopoulos; R Skjaerven

doi:10.1038/sj.bjc.6600453

Pregnancy related protection against breast cancer depends on length of gestation

Br J Cancer. 2002 Jul 29;87(3):289-90. doi: 10.1038/sj.bjc.6600453.

Authors

L J Vatten¹, P R Romundstad, D Trichopoulos, R Skjaerven

Affiliation

¹ Department of Community Medicine and General Practice, The Norwegian University of Science and Technology, Trondheim, Norway. Lars.Vatten@medisin.ntnu.no

Abstract

In a prospective study of 694 657 parous women in Norway, 5474 developed breast cancer after their first birth. If the first pregnancy lasted less than 32 weeks, the risk was 22% (95% confidence interval, -3% to 53%) less than after a pregnancy of 40 weeks or more, with a significant declining trend in risk (P for trend=0.02).

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Adult
Aged
Breast Neoplasms / prevention & control*
Female
Humans
Maternal Age
Middle Aged
Pregnancy / physiology*
Prospective Studies
Time Factors