The Asia Radiotherapy Symposium (ARTS) was launched in 2013 as an academic discussion group for radiotherapy in the Asian region. The original members were Hong Kong, Singapore, Taiwan, and Malaysia, and three more countries (Korea, Japan, and Thailand) joined in the 5th ARTS meeting held in Hong Kong. The purpose of ARTS is to share various knowledge and provide quality radiotherapy services through international exchanges among specialized therapeutic radiologists in the Asian region.