Several lines of evidence support that PD-1H was expressed predominantly in myeloid cells of multiple myeloma, melanoma, and colorectal carcinoma, which were assessed mainly by multiplex immunofluorescence (Choi et al., 2020; Mutsaers et al., 2021; Zong et al., 2021). The gene discussed is VSIR; the disease is colorectal carcinoma.