IL2RA and neoplasm: Regulatory T (Treg) cells, known suppress immune effector cell activity and promote tumour immune escape,49, 50 were divided into two subgroups: one expressing FOXP3 and IL2RA (also known as CD25) and marked by TNFRSF9,51 indicating activation, and the other showing IFIT1 and IFIT3, suggesting responsiveness to interferons.