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The population ratio of elderly persons is increasing year by year primarily in advanced countries, and precise care for cancer in these persons is required. In recent years, there has been a heightened interest among the worldwide medical community for dedicated, minimal-invasive treatment to improve a patient's quality of life. Proton therapy, an effective method for controlling cancer, will fill an important role in minimal-invasive treatment. Hitachi, Ltd. has been developing a proton therapy system through construction of a total system integrating an accelerator system, a medical information system, and medical electronics. The features and possibility of expansion of Hitachi's proton therapy system are introduced.