Postmenopausal women undergoing hormone replacement therapy may increase their chances of developing breast cancer by 1.5 times, compared with women not on hormones, according to a study published in the Journal of the National Cancer Institute. The study looked at women receiving HRT with both estrogen and progestin and women without it over an 11-year period. The findings also confirm the fact that women undergoing HRT were more likely to develop all categories of breast cancer; previously, researchers believed HRT increased the likelihood of less aggressive cancers.

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