HLA-A and breast cancer: To evaluate whether these ATRA-dependent transcriptomic effects translate into an increase of the HLA-A/B/C surface-antigens, we performed FACS (Fluorescence-Activated-Cell-Sorter) analyses in the gastric-cancer HGC-27, LMSU, KATO-III, AGS and the breast-cancer SKBR3 (positive control) cell-lines, using an anti-HLA-A/B/C antibody (Fig. 5B and C).