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  • Title: Breast cancer and reproductive history from genealogical data.
    Author: Hunt SC, Williams RR, Skolnick MH, Lyon JL, Smart CR.
    Journal: J Natl Cancer Inst; 1980 May; 64(5):1047-53. PubMed ID: 6929010.
    Abstract:
    With the use of data from the Utah State Cancer Registry and Utah genealogical data, an analysis of 236 breast cancer patients and 937 controls matched on year of birth showed that a late age at the birth of the first child was most strongly associated with incidence of breast cancer (relative odds = 2.0; P less than 0.001). A strong interaction was found between age at first delivery (AFD) and age at last delivery (ALD). The association of AFD with breast cancer incidence was strongest for women with an ALD before 35 years of age even after adjustment for partly (relative odds = 4.1; P less than 0.001). Decreased parity was not significantly associated with breast cancer.
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