Mevion Medical Systems, Inc. is a leading provider of proton therapy systems for use in radiation treatment for cancer patients. Mevion is privately held and based in Littleton, Massachusetts, with international offices in the United Kingdom and Japan and a joint venture in China. For more information, please visit www.mevion.com. About the MEVION S250 Series: The MEVION S250 Series is elegantly designed to deliver high-powered, efficient proton therapy treatments. Built upon the world’s only gantry-mounted proton accelerator and benefitting from Mevion’s patented direct beam technology, the MEVION S250 Series delivers on the therapeutic promise of proton therapy while enhancing beam quality, stability and uptime. The result is reduced system complexity, higher reliability and throughput, and lower capital and operating costs—making the MEVION S250 Series a compelling, financially viable solution for all cancer centers. The Series is comprised of: • MEVION S250, offering highly stable, next-generation volumetric delivery capabilities • MEVION S250i with HYPERSCAN technology, overcoming pencil beam scanning uncertainties by delivering robust Intensity Modulated Proton Therapy treatment at hyper-speed • MEVION S250mx, making proton therapy fully scalable, with two, three and four room designs that are inherently redundant and guarantee 100 percent facility uptime