PLAC1 and neoplasm: Then, it is revealed that Plac1+ tumor cells recruit CD4+ T cells via CXCL11/CXCR3 and induce Treg differentiation via PVR/TIGIT, which in turn activates the tumorigenic signaling of Plac1+ tumor cells via LTA/LTBR and forms a reciprocal protumor loop.