PDCD1LG2 and neoplasm: Intratumoural injection of EVs derived from parental B16‐F10 cells expressing PD‐L2 (PDL2 EVs) significantly promoted tumour growth and shortened survival compared to the injection of shPDL2 B16‐F10‐derived EVs (shPDL2 EVs) (Figure 6b,c).