For in vitro experiments, we used tumour conditional medium (TCM) from ID8 cells (NC or sh‐CD81 ID8‐TCM) to induce Tim4+ RAW264.7 cells (tumour‐conditioned RAW264.7 cells), and the overexpression of Tim4 protein has been verified after treatment (Figure S7A). The gene discussed is TIMD4; the disease is neoplasm.