SUNNYVALE, Calif., May 2, 2017 /PRNewswire/ -- Accuray Incorporated (NASDAQ: ARAY) announced today preliminary results from a prospective, phase I clinical trial evaluating adjuvant stereotactic partial breast irradiation (S-PBI) in early stage breast cancer patients treated with the CyberKnife® System. The study, published in the May issue of the peer-reviewed International Journal of Radiation Oncology - Biology - Physics, reported no recurrences or distant metastases at median follow-up of 26 months. Additionally, at two years, more than 95 percent of patients and 100 percent of physicians rated cosmesis as excellent or good, indicating both patients and physicians were satisfied with the appearance of the breast (cosmesis) following treatment.

For further information on the CyberKnife System, visit http://www.accuray.com/product/cyberknife

"The results of this phase 1 study highlight a new approach for treating breast cancer while minimizing tissue exposure. We believe our protocol offers reproducible and executable guidance for other radiation therapy teams interested in incorporating S-PBI into their practice," said Asal Rahimi, M.D., M.S., Assistant Professor of Radiation Oncology, University of Texas Southwestern Medical Center, in Dallas, Texas. "Our study shows the benefits of real-time image guidance and motion control when delivering S-PBI."
The study titled, "Preliminary Results of a Phase 1 Dose Escalation Trial for Early Stage Breast Cancer Using 5-Fraction Stereotactic Body Radiation Therapy for Partial Breast Irradiation (S-PBI)," provides results for 75 patients treated with S-PBI following lumpectomy. It showed:

Real-time image guidance and motion control with the Synchrony® Respiratory Tracking System enabled precise treatments, ultimately limiting toxicity and preserving cosmesis;
Dose escalation to 40 Gy/5 fractions is possible without exceeding the maximum tolerated dose. Treatments provided tumor control with minimal acute or late side effects;

S-PBI provides a more convenient treatment option than hypofractionated whole-breast irradiation (NCCN guideline: 40-42.5 Gy over 15-16 fractions), with no compromise in tolerability or short-term efficacy.

"Numerous clinical studies have shown the benefit of breast conservation therapy, consisting of lumpectomy and radiation, for increasing long-term survival. With advances in radiation therapy technologies, clinicians continue to evaluate protocols to determine the best treatment approach," said Fabienne Hirigoyenberry-Lanson, PhD, Vice President Global Medical and Scientific Affairs, at Accuray. "This study indicates S-PBI could become an important option in the treatment of women with early-stage breast cancer. The CyberKnife System is a non-invasive option delivered in a reduced number of treatments, which may provide an optimal combination of efficacy, tolerability and convenience for many patients."

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