A unique feature of radiation therapy is its ability to destroy only the cancer while sparing the surrounding normal tissue. Recently, stereotactic radiation therapy (SRT), which delivers pinpoint radiation to a localized area, and intensity-modulated radiation therapy (IMRT), which delivers radiation that conforms perfectly to the shape of the tumor, have further minimized damage to normal tissue, allowing for increased doses to the tumor and thereby increasing cure rates. Radiation therapy has been shown to achieve therapeutic effects equivalent to surgery in many areas. Depending on the type and stage of cancer, it may be beneficial to combine it with chemotherapy or surgery. Radiation therapy can generally be performed on an outpatient basis alone. Because it is less physically demanding, even elderly patients can receive it with peace of mind. Radiation therapy is not widely used in Japan, with only about one-quarter of all cancer patients receiving it. However, in Europe and the United States, more than 60% receive it, and this trend is expected to increase in Japan in the future. We also accept second opinions, so please don't hesitate to consult with us. While external beam radiation therapy is typically performed over several weeks using a machine called a linac, stereotactic radiation therapy can be performed in one or several sessions. Since 2017, we have been expanding our treatment equipment and actively employing intensity-modulated arc therapy (VMAT), an advanced form of IMRT, to deliver highly accurate, short-duration irradiation. We are also promoting hypofractionated irradiation to shorten the length of hospital visits. Brachytherapy is performed under image guidance using a Remote After Loading System (RALS) equipped with an iridium source. In 2024, we introduced equipment that enables treatment and CT imaging to be performed in the same room, allowing for safer and more accurate treatment than before. We work in collaboration with each department to safely provide the most appropriate treatment for each patient. Additionally, we joined the JCOG Radiation Oncology Group in 2018 and have been registering cases since then.