B7-1, B7H1, B7H2 and ICOS mRNA were detected in both cancer cells and tumor infiltrating lymphocytes (TILs).

• 肿瘤组织和肿瘤浸润淋巴细胞除表达B7 1外 ；均可见B7H1；B7H2和ICOSmRNA表达 ；但肿瘤细胞的表达水平显著高于TIL的表达水平 ；具有显著性差异 (P <0 .；0 5 ) ;