Changes in circulating non‐NK ILC subsets have been reported in metastatic colorectal cancer (CRC), gastric cancer, non‐small cell lung cancer (NSCLC), chronic lymphocytic leukaemia (CLL) and acute myeloid leukaemia (AML) [84, 85, 86, 87, 88]. Here, CCL27 is linked to acute myeloid leukemia.