93% for low-risk patients, superior to the 81% – 85%^{22, 23} from conventional radiation therapy historical data and similar to HDR at 92%.

It is used to treat conditions throughout the body, including the prostate, lung, brain, spine, head and neck, liver, pancreas and kidney, and can be an alternative to surgery or for patients who have inoperable or surgically complex tumors. CyberKnife treatments are typically performed in 1 to 5 sessions.

“In a clinical study of 333 patients using the CyberKnife System to treat tumor metastases to the brain, more than 85 percent of evaluable patients achieved local tumor control at two years post treatment. That is, the tumor either decreased in size or stopped growing,” Accuray reports.

Most radiation side effects are minimal and last only a short time. Side effects can, however, sometimes be severe because of rectum or bladder wall exposure to radiation. Possible side effects could include, but are not limited to: Constipation, fecal urgency, fecal incontinence, hemorrhoid, rectal bleeding.