Studies have demonstrated ectopic sources of hepcidin production, especially in several cancers derived from the kidney, colon, lung, breast, or prostate (Tesfay et al., 2015; Vela and Vela-Gaxha, 2018; Jerzak et al., 2020; Colorectal Cancer Cells, 2021; Fan et al., 2021; Schwartz et al., 2021). This evidence concerns the gene HAMP and cancer.