Risk factors for breast cancer in young women by oestrogen receptor and progesterone receptor status.

While two other population-based studies of breast cancer have claimed evidence for some differences in risk factor profile according to joint ER/PR receptor status ( Potter et al , 1995 ; Huang et al , 2000 ), they should perhaps be viewed as hypothesis-generating analyses, given that their findings were based on multiple comparisons, had nominal P -values of marginal significance, and some comparisons lacked statements about the statistical significance of observed differences in odds ratios.

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