CYBERKNIFE:
ROBOTIC RADIOSURGERY
A complete guide to CyberKnife โ the robotic radiosurgery system that delivers high-dose, precisely focused radiation with real-time tumour tracking across brain, spine, lung, liver, prostate, and other sites, typically in 1-5 sessions.
analyticsAt a Glance
- check_circleCyberKnife mounts a compact LINAC on a robotic arm โ delivering radiation from hundreds of angles with sub-millimetre accuracy.
- check_circleSynchrony real-time tracking adjusts beam delivery for breathing motion โ no breath-hold required for lung and liver treatments.
- check_circleFrameless and non-invasive โ no rigid head frame, no incisions, no anaesthesia for most adult patients.
- check_circleAvailable at HCG, Apollo, and other Indian centres (USD 3,000-12,000) and at major Chinese cancer hospitals.
What Is CyberKnife?
CyberKnife is an advanced robotic radiosurgery system developed by Accuray. It combines a compact linear accelerator mounted on a robotic arm with a sophisticated real-time image guidance system to deliver high-dose, precisely focused radiation to tumours throughout the body. Despite the name, no incisions are made โ it is entirely non-invasive.
โCyberKnife's robotic arm moves the radiation source to hundreds of different positions around the patient โ concentrating dose at the tumour from every angle while normal tissue receives only a fraction of any single beam.โ
Robotic Arm โ Unlimited Beam Angles
A compact LINAC mounted on a robotic arm can move to hundreds of different positions around the patient, directing radiation from many non-coplanar angles. This geometrically precise delivery concentrates dose at the tumour intersection while each surrounding structure receives only a small portion of any individual beam.
Synchrony Real-Time Respiratory Tracking
External optical markers on the patient's chest correlate with internal tumour position in real time. As the tumour moves with breathing, the robotic arm adjusts beam direction to follow it โ without the patient needing to hold their breath. Critical for lung and liver tumours that move significantly with respiration.
Frameless Immobilisation
Unlike earlier radiosurgery systems that required a rigid stereotactic head frame bolted to the skull, CyberKnife uses image-based tracking to verify position in real time. This eliminates the discomfort of frame placement and makes CyberKnife practical for fractionated treatments requiring multiple sessions.
SRS and SBRT in One System
CyberKnife delivers stereotactic radiosurgery (SRS) for intracranial targets and stereotactic body radiation therapy (SBRT) for extracranial sites โ both on the same platform. This versatility across anatomical locations distinguishes it from dedicated intracranial-only systems like Gamma Knife.
Which Cancers and Conditions Is CyberKnife Used to Treat?
CyberKnife's combination of robotic flexibility and real-time tracking makes it applicable across a wider range of anatomical sites than most radiosurgery systems.
Brain Metastases and Brain Tumours
CyberKnife treats brain metastases from lung, breast, melanoma, colon, kidney, and other primaries โ with comparable local control to Gamma Knife for appropriate lesion sizes. Its frameless approach is preferred by patients who find rigid head frames difficult. Multiple brain metastases can be treated in a single session.
Spinal Tumours and Spinal Metastases
Spinal radiosurgery is one of CyberKnife's strongest clinical advantages. The precision required to deliver high doses to tumours adjacent to the spinal cord while protecting this critical structure is achievable with CyberKnife's sub-millimetre accuracy. Effective for radioresistant histologies including renal cell carcinoma and melanoma.
Lung Cancer (SBRT)
CyberKnife is an established treatment for early-stage inoperable NSCLC and for oligometastatic lung disease. Synchrony respiratory tracking is particularly valuable for lung tumours that move with breathing, enabling precise delivery without breath-hold requirements.
Liver Cancer and Liver Metastases
CyberKnife SBRT is used for hepatocellular carcinoma and isolated liver metastases in patients who are not surgical candidates. Respiratory tracking allows precise liver targeting despite significant respiratory motion.
Prostate Cancer
CyberKnife has one of the most extensively studied roles in prostate SBRT. Multiple prospective trials and long-term outcome data support its use for localised prostate cancer. Treatment is typically 4-5 fractions โ compared to 7-8 weeks of conventional radiotherapy.
Pancreatic, Kidney, and Other Sites
CyberKnife is used for locally advanced pancreatic cancer (typically combined with chemotherapy), primary renal cell carcinoma in medically inoperable patients, and oligometastatic disease at various sites including adrenal glands and lymph nodes.
CyberKnife vs Gamma Knife: Key Differences
Both are high-precision radiosurgery platforms. The choice depends on tumour location, size, and clinical context.
CyberKnife Advantages
- Treats brain AND body tumoursFull-body SBRT capability โ spine, lung, liver, prostate, pancreas, and other extracranial sites.
- Real-time respiratory tracking (Synchrony)Beam follows tumour motion โ no breath-hold required for moving targets.
- Frameless โ no rigid head frameMore comfortable for patients; enables fractionated treatments over several sessions.
- Multiple brain metastases in one sessionRobotic arm can treat many lesions efficiently without repositioning.
Gamma Knife Advantages
- Sharpest dose gradient for intracranial targets192 cobalt sources produce the steepest dose fall-off โ gold standard for intracranial radiosurgery.
- Longest clinical track record for brainDecades of intracranial SRS data โ the most established technology for brain tumours.
- Highest spatial accuracy for brain targetsDedicated intracranial design optimised for sub-millimetre precision within the skull.
- Preferred for acoustic neuroma and AVMWhere the sharpest dose falloff is clinically most important.
CyberKnife Treatment Costs: India and China vs USA
India has the largest CyberKnife programme in Asia and offers world-class treatment at 80-90% lower cost than the US.
CyberKnife SBRT โ Brain Metastases (Single Session)
- India (HCG, Apollo)USD 3,000-7,000
- China (major cancer centres)USD 4,000-9,000
- USAUSD 20,000-45,000
CyberKnife SBRT โ Prostate Cancer (5 Fractions)
- IndiaUSD 5,000-12,000
- ChinaUSD 6,000-14,000
- USAUSD 25,000-60,000
Key Evidence Numbers
- 1-5Treatment Fractionsvs 25-35 fractions for conventional radiotherapy โ total treatment completed in days not weeks.
- 93-97%2-Year Local Control โ Brain MetastasesComparable to Gamma Knife for appropriately sized lesions (2-3 cm or less).
- 90-95%3-Year Local Control โ Stage I NSCLCMultiple prospective series for medically inoperable early-stage lung cancer.
- ~1 mmTargeting AccuracySub-millimetre precision with image-guided tracking โ confirmed in quality assurance measurements.
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Frequently Asked Questions
About CyberKnife Treatment
Is CyberKnife treatment painful?
No. CyberKnife treatment causes no immediate discomfort during beam delivery. No anaesthesia is required for most adult patients. The robotic arm moves around you silently while you lie still on the treatment couch. Each session takes 30-90 minutes depending on the number of beams and the complexity of the treatment plan.
How does CyberKnife handle breathing movement?
CyberKnife's Synchrony respiratory tracking system uses external optical sensors on the chest combined with periodic internal X-ray imaging to establish a real-time correlation between visible surface motion and internal tumour position. As the patient breathes normally, the robotic arm continuously adjusts beam direction to follow the tumour. No breath-hold is required.
Where is CyberKnife available in India?
India has one of the largest CyberKnife programmes in Asia. Major centres include HCG Cancer Centres (multiple cities), Apollo Cancer Centres, Fortis Hospital, Lilavati Hospital Mumbai, Manipal Hospitals, and others. India offers CyberKnife at USD 3,000-12,000 depending on indication and fractions, compared to USD 20,000-60,000 in the US.
How CancerFax Helps
CancerFax is a specialist cancer access and patient-navigation platform. We help patients and families understand their options, organise medical records, coordinate hospital communication, and support cross-border treatment planning where appropriate.
We help collect and organise reports, scans, pathology, biomarker results, and treatment history for structured case review.
We communicate with hospitals or trial teams to assess whether a case may be suitable for further screening.
We support appointment coordination, document submission, translation, and direct communication with international departments.
For international patients, we help with practical coordination โ travel planning, hospital admission guidance, and local support.
If this option is not suitable, we help explore other relevant treatments, clinical trials, or advanced care pathways.
From inquiry through to follow-up, our coordinators provide a single point of contact for the family.
CancerFax does not guarantee treatment access, eligibility, or clinical outcome. Our role is to help patients access accurate information, structured review, and appropriate specialist pathways.
Is CyberKnife the Right Option for Your Tumour?
Upload your imaging and pathology โ our radiation oncology team will review your case and provide an honest assessment of CyberKnife eligibility and the best centre for your specific indication.
This content is for informational purposes only and does not constitute medical advice. All treatment decisions must be made in consultation with a qualified radiation oncologist.