PDCD1 and ovarian neoplasm: Our studies demonstrated that Lv-PD1-γδ T cells could functionally improve the therapeutic efficacy of γδ T cells in ovarian tumor-bearing mice even though a very subtle difference between Lv-PD1-γδ T cells and a combination of γδ T cells with a commercialized PD-1 antibody in the in vivo mouse model.