Increasing the expression of FAS in colorectal cancer represents a poor prognosis in people who are affected, because the FAS enzyme plays an important role in the regulation of pro-apoptotic proteins and cellular processes, such as DNA repair (increased repair), and therefore its expression increases the resistance to FAS drugs, such as orlistat, therefore enhancing apoptosis in cancer cells (Ogino et al., 2007; Wu et al., 2014). This evidence concerns the gene FAS and colorectal cancer.