GDF15 and neoplasm: * “The relationship between the ferroptosis-related genes and tumor-infiltrating immune cells was revealed by ANGPTL7 and M2 macrophages, ANGPTL7 and monocytes, GDF15 and M1 macrophages, LINC00472 and M2 macrophages, RRM2 and M1 macrophages, RRM2 and monocytes, and SLC2A1 and M1 macrophages.”