ERBB2 and breast cancer: In the present work, from the 75 specific proteins identified for the different BC subtypes (n = 8 in LA; n = 27 in LB-; n = 2 in LB+; n = 28 in HE; and n = 10 in TNBC), 34 proteins were immunoglobulins (n = 3 in LA; n = 14 in LB-; n = 1 in LB+; n = 13 in HER2+; and n = 3 in TNBC) (see Table 2).