To identify GNG2 expression in various BC subtypes, we analyzed GEO data and found that GNG2 expression was lower in all four BC subtypes, including the luminal A and B, HER-2, and triple-negative BC (TNBC) than in nontumor tissues, but there was no difference between subtypes of BC (Fig. 3A). The gene discussed is ERBB2; the disease is breast cancer.