Kei Ito is a leading radiation oncologist in Japan specializing in stereotactic body radiotherapy (SBRT) for cervical cancer and bone metastases (including spine and non-spinal bone). He is active in promoting SBRT for spinal metastases through symposiums, educational lectures, and clinical research on the topic. He is also the first author of more than 15 articles published in international journals, has planned and managed a total of six clinical trials, and has published the results of five trials (including those submitted).