The development, progression, and prognosis of CRC involve various redox-sensitive proteins such as phosphatase and tensin homolog (PTEN), transforming growth factor beta (TGF-β), vascular endothelial growth factor (VEGF), and platelet-derived growth factor (PDGF) that necessitate the evaluation of redox status of cysteine residues [61]. Here, PTEN is linked to colorectal carcinoma.