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Epidemiological studies provide strong evidence of a role for endogenous sex hormone levels in the aetiology of breast cancer [1] and suggest that levels may be partly genetically determined. Quantification of hormone levels in premenopausal women, however, is difficult because of their cyclical nature. In particular, oestrogen has a marked peak in the follicular phase and a further wider peak in the luteal phase.

Polymorphisms, endogenous hormone levels and familial breast cancer risk in premenopausal women