“…T2 cells, which bear the HLA-A*0201 gene, but express a very low level of cell surface HLA-A2.1 molecules and are unable to present endogenous antigens due to a deletion of most of the MHC class II region including TAP (transporter-associated with antigen processing) and proteosome genes, were kindly provided by Dr Sun Zongtang (Chinese Academy of Medical Sciences). Hepatocellular carcinoma cell lines HHCC, gastric carcinoma cell lines KATO-III and breast carcinoma cell lines MCF-7 were all HLA-A2 + and cultured in our lab (20)(21)(22)(23). All these cell lines were maintained in RPMI-1640 medium (Invitrogen, USA) supplemented with 12% fetal bovine serum (FBS, Hyclone, USA) and antibiotics.…”