Risk of breast cancer in relation to the interval since last full term pregnancy.

Abstract:

OBJECTIVE:To examine whether the risk of breast cancer is increased by a recent term pregnancy. DESIGN:Population based case-control study. SETTING:Eight areas in the United States. SUBJECTS:Cases were 2279 multiparous women residents of the eight areas aged 25-49 who were diagnosed as having breast cancer during 1980-2. Controls were 2357 multiparous women selected from the same areas by random digit dialing. MAIN OUTCOME MEASURE:Relative risk of developing breast cancer according to the time interval since last full term pregnancy. RESULTS:The distribution of intervals since the last term pregnancy was similar in cases and controls. Adjusted for age, parity, and age at first term pregnancy, the odds ratios observed for categories of years since the last full term pregnancy were: 0-2 years, odds ratio 1.16 (95% confidence interval 0.84 to 1.59); 3-6 years, odds ratio 1.21 (0.95 to 1.54); 7-9 years, odds ratio 1.04 (0.84 to 1.38); > or = 10 years, odds ratio 1.00 (reference). CONCLUSIONS:Among multiparous women aged 25-49 years there was no association between the risk of breast cancer and the time interval since the last full term pregnancy.

journal_name

BMJ

authors

Cummings P,Stanford JL,Daling JR,Weiss NS,McKnight B

doi

10.1136/bmj.308.6945.1672

subject

Has Abstract

pub_date

1994-06-25 00:00:00

pages

1672-4

issue

6945

eissn

0959-8138

issn

1756-1833

journal_volume

308

pub_type

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