To this aim, we used both TNBC MDA-MB-231 cells (Fig. 1a), and ErbB2-positive breast cancer SK-BR-3 and JIMT-1 cell lines (Fig. 1b,c) expressing satisfactory levels of PD-L1 (Fig. 1d) on the cell membrane28,29. The gene discussed is ERBB2; the disease is breast carcinoma.