The relationship between CCL17 and CCR4 was retrieved in GEPIA, where it was shown that CCR4 and CCL17 expression is significantly correlated in LUAD tumour(r = 0.34, P = 2.8e−14) and LUAD normal (r = 0.3, P = .023) (Figure 7I‐J). Here, CCR4 is linked to neoplasm.