Letters Section Editor: Robert M. Golub, MD, Senior Editor.
In Reply: We agree with Dr Murray that there is good evidence that parity protects against breast cancer, since nulliparous women are at a higher risk of developing breast cancer compared with parous women.1 This risk is further reduced, although more modestly, with each subsequent birth.2 We do not think that our results are inconsistent with these findings.
Cnattingius S, Torrång A, Ekbom A, Granath F, Petersson G, Lambe M. Placental Weight and Maternal Risk of Breast Cancer—Reply. JAMA. 2006;295(10):1124-1125. doi:10.1001/jama.295.10.1125