Tailored medicine offers specific examples of its application in various fields. For hypertension treatment, conventional methods involved prescribing general medications, but with tailored medicine, it is now possible to select the optimal drug based on the patient's genetic information, maximizing the effect and minimizing side effects. In cancer treatment, selecting specific anticancer drugs based on the patient's genotype can enhance treatment efficacy, and targeted therapies are sometimes used for patients with certain gene mutations. Preventive measures for lifestyle diseases, which are influenced by genetic factors, can also be tailored to individual genetic information, helping to prevent or delay the onset of these diseases. Successful cases of tailored medicine include the development of a new drug for amyotrophic lateral sclerosis (ALS) using iPS cells by a research group at Keio University, which demonstrated the drug's safety and efficacy in clinical trials, marking a significant step forward. Additionally, Japan's CREST project has established foundational technologies for tailored medicine using genome information for multifactorial diseases such as cancer, lifestyle diseases, cerebrovascular diseases, and immune disorders, enabling the identification, diagnosis, prevention, and treatment of specific diseases. These examples highlight the potential of tailored medicine to provide more effective and safer treatments by utilizing individual genetic information.