Within tumor tissue in the adequate iron group, and more so in tumors from the excess iron diet group, we found there was also significantly greater (p ≤ 0.05) expression of proteins involved in protein degradation (ANPEP, DPP7, ITGB1, PSMA1, PSMA2, PSMA3, and SERPINB1). This evidence concerns the gene PSMA1 and neoplasm.