It is worth noting that Lehmann, who had the highest link strength with other authors, proposed 6 subtypes of TNBC (basal-like 1 (BL1), basal-like 2 (BL2), immunomodulatory (IM), mesenchymal (M), mesenchymal stem-like (MSL), Luminal androgen receptor (LAR)) in an article published in 2011, clarifying the characteristics and potential targeted therapies of 6 subtypes of triple-negative breast cancer, and then he revised them to 4 subtypes (BL1, BL2, M, and LAR) in 2016 (16, 44). Here, PTPRF is linked to triple-negative breast carcinoma.