On March 9, 2019, the 100th anniversary of the birth of Professor Gu Xianzhi, the founder of modern oncology radiotherapy in China, a famous medical scientist and medical educator, was held in Beijing. More than 70 current leaders from many top radiotherapy centers in China, including Peking Union Medical College Hospital, Third Hospital of Peking University, Beijing Cancer Hospital, Tianjin Cancer Hospital, Sichuan Cancer Hospital, Professor Yin Weibo, Professor Liu Mingyuan, Professor Zhou Juechu and other radiotherapy seniors who have worked and studied with Professor Gu Mianzhi, and nearly 1,000 radiotherapy colleagues from all over the country participated in this commemorative activity.