Learning From Temporal Relationships: Childbirth and Breast Cancer Risk

In their article, Nichols and colleagues report the results of a large and sophisticated analysis of the relationship between childbirth and breast cancer risk. The editorial discusses the insight the study provides into this complex relationship. Although the clinical implications of these findings are limited, the temporal relationship between childbirth and breast cancer risk offers an important clue for the ongoing effort to identify the mechanisms linking reproductive history and breast cancer risk.

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