AFP is not only a biomarker for liver, testis, and ovary cancer, but is also detected in other cancer types including colorectal and gastric cancers and in xenograft tumors of neural stem cells and different cancer cell lines (Yachida et al., 2003; Anzai et al., 2015; Gong et al., 2018; Xu et al., 2021). This evidence concerns the gene AFP and cancer.