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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.