At the protein level, the average percentage of L4-LrNK-FCGR3A (CXCR6+CD16+) cells was 8.53% in the healthy liver, but their proportion in the liver cancer tissues (2.7%) was significantly lower than that in healthy liver tissues, as demonstrated by FACS (Supplementary Figure S2A–S2C). Here, FCGR3A is linked to liver cancer.