Birth Characteristics of Women Dying From Breast Cancer2

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Abstract
Data From birth certificates of 229 white women dying from breast cancer in upstate New York at ages 40–44 and a matched control group from the same birth cohort demonstrated a differential risk of death from breast cancer associated with mother's age at birth of the study subject. The relative risk of dying from breast cancer increased with increasing maternal age beyond 30 years. This association with maternal age was independent of birth order and was most pronounced for women who had never married. The breast cancer cases also included an excess of women born in urban areas. The effect of residence was independent of maternal age. No association was noted between death from breast cancer and month of birth or plurality.

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