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Table 2 Recent large studies investigating the impact of pregnancy and breastfeeding on the risk of developing breast cancer according to biology

From: Biology of breast cancer in young women

  Population Number Impact of parity on breast cancer risk according to subtype Impact of breastfeeding on breast cancer risk according to subtype
Shinde et al. 2010 [38] MD Anderson 2,473 Increase TNBC risk Reduce TNBC risk
Palmer et al. 2011 [39] African American 457 Reduce ER + BC risk Reduce TNBC risk
Redondo et al. 2012 [40] Spanish 501   Reduce TNBC risk
Chung et al. 2013 [41] Korean 6,952 Reduce ER + BC risk  
Li et al. 2013 [42] American 1,962 (<45 years) Reduce ER + BC risk Reduce TNBC risk
  1. BC, breast cancer; ER+, estrogen receptor-positive; TNBC, triple-negative breast cancer.