Clinicians at the Rinecker Proton Therapy Center (RPTC) have treated their 100th patient using advanced proton therapy systems supplied by Varian Medical Systems Inc. The landmark treatment comes just three months after a second treatment gantry was commissioned at the center, which offers advanced pencil-beam proton scanning to cancer patients. These patients, requiring treatment for a wide range of cancers, have come from across Germany and 19 other countries, including Canada, Argentina, the UK and Switzerland. Among the first 100 patients have been several children, as proton therapy's ability to limit exposure to healthy tissue is particularly valuable in pediatric treatments. A typical pediatric treatment involved a seven-year-old girl suffering from a malignant blastoma in the upper neck area. Unlike conventional X-ray based radiotherapy that utilizes photons and electrons, proton therapy involves delivering heavier proton particles to destroy tumors.

Varian Medical Systems appointed John R. Adler, Jr., M.D., as Vice President and Chief of New Clinical Applications for the company. Dr. Adler, a renowned neurosurgeon, professor of Neurosurgery and Radiation Oncology at Stanford University, and past CEO Chairman and founder of Accuray Inc., will be joining Varian to play a key role in guiding the development of Varian's next-generation clinical products and applications for radiosurgery and other new treatments. John Adler brings a unique combination of strengths to the Varian team, including expertise in radiosurgery together with an impressive record of success as a clinical researcher, innovator, and entrepreneur. Dr. Adler, who joins Varian effective April 5, will report to Guertin and be a member of the CEO staff. He will represent Varian at medical meetings and partner with radiation oncologists and surgeons to develop products and clinical approaches that expand the applications for and improve the outcomes of radiosurgery. His responsibilities include working with the medical community to improve the effectiveness and efficiency of Varian clinical products through best-in-class designs, techniques, and processes.

On February 19, 2010, Varian Medical Systems Inc. dismissed Mohler Nixon & Williams Accountancy Corporation, the independent registered public accounting firm for the audit of the Varian Medical Systems Inc. Retirement Plan. Since the audit involves only the Plan, which is independent of the Company, the change in independent registered public accounting firms was reviewed and recommended by the Company's management, which through the Varian Medical Systems Inc. Benefits Committee, comprised of members of management, administers the Plan. On February 19, 2010, the Company engaged Burr, Pilger and Mayer LLP to act as the new independent registered public accounting firm for the audit of the Plan.