The mammographic breast pattern and oral contraception

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The relationship of oral contraceptive usage to breast parenchymal patterns has been studied in 5319 self-selected women presenting to a breast screening unit. Among premenopausal women, 46.1% had taken an oral contraceptive ("the pill") in the past, and 9.5% were still taking the pill. These patients showed a decreased incidence of P2 patterns and an increased incidence of N1 patterns. Of the post-menopausal women, 14.7% had been on the pill. Similar differences of incidence of parenchymal patterns are noted in these women. The significance of these changes is unclear.