A combination photo shows Ph.D. James P. Allison of MD Anderson Cancer Center at The University of Texas in this picture obtained from MD Anderson Cancer Center at The University of Texas on October 1, 2018 (R) and Kyoto University Professor Tasuku Honjo in Kyoto, Japan in this photo taken by Kyodo September 17, 2018. Mandatory credit Kyodo/MD Anderson Cancer Center at The University of Texas/Handouts via REUTERS