Hormonal content and potency of oral contraceptives and breast cancer risk among young women.

Br J Cancer · 2003 · PMC2376784 · PMID 12556959

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a significant trendno p-value reported

Combination progestin/oestrogen potency similarly showed a significant trend of increasing breast cancer risk with increasing potency ( P trend <0.01); recent use of low progestin/low oestrogen potency pills was associated with a RR of 1.79, low progestin/high oestrogen potency with a RR of 2.53, and high progestin/low oestrogen potency with a RR of 8.07.

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