The phosphatidyl inositol 3-kinase/mammalian target of rapamycin (PI3K/mTOR) pathway is an important target for therapies for numerous cancers such as lung carcinoma, thyroid carcinoma, breast cancer, gastrointestinal carcinoma, and bladder carcinoma [30]–[33]. The gene discussed is MTOR; the disease is digestive system carcinoma.