IL2 and neoplasm: Besides, FGF/FGFR promoted the survival of Treg cells and the M2 polarization of tumor‐associated macrophages (TAMs) by facilitating interleukin‐2 (IL‐2)‐mediated signal transducer and activator of transcription (STAT5) phosphorylation, thereby promoting an suppressive immune microenvironment [34].