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CyberKnife Radiosurgery for Early-Stage Breast Cancer
Date:10/31/2010

on-invasive radiation therapy approaches minimize such risks, studies have demonstrated that the larger margins required to compensate for treatment inaccuracies, such as those caused by the movement of the breast with respiration, result in a higher risk for overdosing the skin and nearby critical structures such as the heart and lungs(5-7). One recent study investigating IMRT for partial breast irradiation found 7 out of 32 evaluated patients developed unacceptable cosmesis, leading to premature closure of the study(5).

Because of the non-invasive delivery and high precision that the CyberKnife System offers in treating tumors throughout the body, clinicians see a role for it in breast cancer treatment. The CyberKnife System has the unique ability to not only track tumor movement during respiration, but to also lock onto the tumor as it moves delivering radiation directly to the tumor and avoiding damage to surrounding critical structures. The CyberKnife System's extreme precision enables clinicians to reduce the treatment margins that are often added with conventional IMRT Systems. For this reason, clinicians believe partial breast irradiation using the CyberKnife System holds the potential to improve toxicity and associated side effects for patients.

"We think that the real-time tracking and high conformality made possible with the CyberKnife System could result in reduced toxicity by reducing the dose to the surrounding breast tissue, skin, chest wall, lung or heart," said Charlie Ma, Ph.D., Professor and Vice-Chairman, Department of Radiation Oncology, Fox Chase Cancer Center.

University of Texas Southwestern recently launched a multi-center early stage breast cancer protocol, which is currently accruing patients. UTSW was one of the first five CyberKnife sites in the world and has remained on the forefront of clinical research.

Physicians at UTSW intend to demonstrate equivalent local control rates or to improve those seen in cur
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SOURCE Accuray Incorporated
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