CD4 and thyroid gland carcinoma: The level of KCNK4 expression negatively correlated with the infiltration levels of B cells (Cor =-0.352, p=1.51e-15), CD4+ T cells (Cor =-0.335, p=2.84e-14), macrophages (Cor =-0.285, p=1.38e-10), neutrophils (Cor =-0.383, p=1.79e-18), and dendritic cell (Cor = -0.409, p = 6e-21) in thyroid carcinoma tissues.