サイシン イリョウ ニオケル ホウシャセン チリョウ ノ ヤクワリ
Current status of radiation therapy
image-guided radiation therapy
New technologies of radiation therapy such as image-guided radiation therapy, stereotactic irradiation, and brachytherapy using remotely controlled after-loading system have made it possible to deliver ideally distributed radiation dose to the target with great accuracy, while sparing the adjacent organs. As a result, tumor control rate by radiation therapy improved markedly and became excellent alternative to surgery for asymptomatic or mildly symptomatic brain tumors, early stage lung cancer, and low-risk prostate cancer. In locally advanced stage of cancer, randomized controlled trials established the chemoradiation therapy as a standard treatment option for patients with head and neck cancer, lung cancer, esophageal cancer, and cervical cancer. Radiation therapy is also a valuable treatment for palliation of local symptoms caused by cancer with consistently high response rates.
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