Marie® by Leo Cancer Care Makes History at Stanford Medicine — World First in Compact Upright Proton Therapy
The first patient treated was a child. The milestone marks the moment upright proton therapy moves from innovation to adoption — and reflects exactly what Leo Cancer Care built Marie® to achieve
Following the landmark first treatment at Stanford Medicine Cancer Center Care June 4, Leo Cancer Care today announces the role of its Marie® upright patient positioning and imaging platform in enabling the world's first compact upright proton therapy patient treatment. Delivered using the Mevion S250-FIT™ Proton Therapy System and powered by RayStation from RaySearch, the milestone is the culmination of a decade of development.
This press release features multimedia. View the full release here: https://www.businesswire.com/news/home/20260609870736/en/ The treatment room at Stanford Medicine Cancer Center, Palo Alto, California, housing the Marie® upright patient positioning platform by Leo Cancer Care (center foreground) integrated with the Mevion S250-FIT™ Proton Therapy System. The circular rotating platform enables a patient seated in the Marie® chair to rotate 360 degrees in relation to a fixed proton beam — replacing the large rotating gantries required by traditional proton therapy systems. This compact configuration, which requires approximately 1,700 square feet compared with over 29,000 square feet for conventional proton therapy facilities, was used on June 4, 2026 to complete the world's first compact upright proton therapy patient treatment. The Marie® system is powered by RayStation from RaySearch.
