The CyberKnife System enables precise dose distributions to be confidently delivered to the patient with extreme accuracy over a minimum number of treatments, reducing side effects and preserving patients' quality of life. Unlike any other radiation delivery system, the CyberKnife® technology continually tracks and automatically adjusts the beam for movement in real-time, as the patient breathes normally, throughout the entire treatment session. The system's sub-millimeter accuracy enhances clinicians' abilities to treat effectively while preserving healthy tissue.
Said Joshua H. Levine, President and CEO of Accuray, "This study shows the benefits of hypofractionated doses delivered with the CyberKnife System in women with early-stage breast cancer: a short course of treatment that is effective with minimal side effects."

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About the Phase I Trial
The purpose of this prospective, phase I study was to evaluate the maximum tolerated dose (MDT) of five fraction stereotactic body radiation therapy for partial breast irradiation (S-PBI) in treating early stage-breast cancer after lumpectomy. All patients were treated with the CyberKnife System which delivers non-isocentric and non-coplanar radiation beams. Patient follow-up occurred every three months for year 1 and every six months until year 5. Longer follow-up and additional Phase II/III data are required to follow late toxicities, control, and determination of the optimal dose to be considered for standard use.
About Accuray
Accuray Incorporated (Nasdaq: ARAY) is a radiation oncology company that develops, manufactures and sells precise, innovative treatment solutions that set the standard of care with the aim of helping patients live longer, better lives. The company's leading-edge technologies deliver the full range of radiation therapy and radiosurgery treatments. For more information, please visit www.accuray.com.
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