First report on the introduction of neutron therapy for cancer. See Hans Svensson & Torsten Landberg, "Neutron therapy--the historical background," Acta Oncologica, 33:3 (1984) 227-231. In 1938 Stone began clinical trials treating cancer with neutrons produced by E. O. Lawrence's cyclotron at the University of California, Berkeley. These trials were terminated because the cyclotron was needed for the war effort during World War II.