what is cyberknife is a common question about this advanced cancer treatment. CyberKnife is a noninvasive robotic radiosurgery system that delivers highly precise radiation to tumors without traditional surgery. It tracks tumor movement in real time, minimizing damage to healthy tissue. Doctors use it for brain, spine, lung, and prostate tumors. Treatment is painless, requires no incisions, and usually involves fewer sessions than conventional radiation therapy. It helps patients worldwide.