McAb PD4 could block tumor cell proliferation cycle and trigger cell death by inducing apoptosis, but expression of Fas antigen in MGC 803 cells was negative.

• PD4有阻滞细胞周期、通过诱发凋亡而抑制肿瘤细胞生长的作用，且MGC－803细胞Fas抗原表达为阴性。