OBJECTIVE:

To investigate the influence of time since childbirth and other pregnancy factors on the prognosis of premenopausal breast cancer.

METHODS:

Women who delivered an infant in Nova Scotia, Canada, between 1980 and 2001 were identified from a provincial perinatal database and linked to the Nova Scotia Cancer Registry to determine primary breast cancer diagnoses among women aged younger than 50 years.

Relative risks and Cox proportional hazards ratios were calculated to quantify the ...

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