Associations of reproductive breast cancer risk factors with expression of stem cell markers in benign breast tissue.

There was a suggestive trend of an inverse association between longer duration of breastfeeding and dichotomous stromal CD24 expression (p-trend = 0.03) ( Supplementary Table 4 ), which, however, did not have a clear pattern.

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Discussion Among 439 cancer-free women in our study, we found inverse associations of age at first birth and the time between menarche and first birth with expression of CD44 and ALDH1A1 and positive, though marginally significant, associations of age at menarche with CD44 expression.

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