CyberKnife-Based Treatment at Max Hospital

CyberKnife is a revolutionary, non-invasive radiation therapy system that delivers highly focused beams of radiation to tumors anywhere in the body. Unlike traditional radiation therapy, CyberKnife uses a sophisticated robotic arm and real-time image guidance to track and target tumors with sub-millimeter accuracy. This allows for the treatment of complex tumors, even those that move with breathing or other bodily functions, while minimising damage to surrounding healthy tissues. It's a surgery-free option for patients seeking precise and effective cancer treatment.

CyberKnife represents a significant advancement in radiation therapy, offering greater precision and convenience compared to traditional methods. Conventional radiation therapy typically requires daily sessions over several weeks, exposing both the tumour and surrounding healthy tissues to radiation. In contrast, CyberKnife delivers highly focused, high-dose radiation in fewer sessions—often just one to five—minimising disruption to a patient’s daily life.

One of the key differences lies in CyberKnife’s real-time tracking system. Unlike traditional radiation therapy, which relies on rigid frames or immobilisation devices to keep patients still, CyberKnife uses advanced robotic technology and image guidance to continuously track the tumour’s position. This allows for adjustments during treatment, even if the patient moves or the tumour shifts naturally due to breathing. As a result, CyberKnife ensures more accurate radiation delivery while reducing the risk of damage to surrounding healthy tissues.

With fewer sessions, minimal discomfort, and reduced side effects, CyberKnife offers a more patient-friendly alternative to conventional radiation therapy, making it an ideal option for treating tumours in sensitive or hard-to-reach areas.

CyberKnife is a non-invasive, robotic radiosurgery system that uses advanced image guidance and real-time tumour tracking to deliver precise, high-dose radiation. Unlike traditional radiation therapy, CyberKnife does not require rigid immobilisation frames. Instead, it continuously monitors the tumour’s position and adjusts the radiation beams accordingly, even compensating for natural movements such as breathing.

The system consists of a lightweight, flexible robotic arm that can move around the patient, targeting the tumour from multiple angles. This flexibility allows for a more concentrated dose of radiation while minimising exposure to healthy tissues. CyberKnife also uses artificial intelligence to make minute adjustments in real time, ensuring that radiation reaches only the affected area with unmatched accuracy.

CyberKnife offers several advantages over traditional radiation therapy and surgery, making it a preferred choice for patients seeking a precise, non-invasive treatment option.

• Non-Invasive & Painless – CyberKnife requires no incisions, anaesthesia, or hospital stay, allowing patients to undergo treatment comfortably without surgical risks.
• Real-Time Tumour Tracking – Advanced imaging technology continuously monitors tumour movement, ensuring that radiation is delivered with pinpoint accuracy while protecting healthy tissues.
• Fewer Treatment Sessions – Unlike conventional radiation therapy, which may require weeks of daily sessions, CyberKnife often completes treatment in just one to five sessions.
• Minimal Side Effects – Because CyberKnife precisely targets tumours while sparing healthy tissues, patients experience fewer side effects compared to traditional radiation therapy.
• Quick Recovery & No Downtime – Most patients can resume their daily activities immediately after treatment, making CyberKnife a convenient option for those with busy lifestyles.
• Effective for Hard-to-Reach Tumours – CyberKnife’s robotic flexibility allows it to treat tumours in sensitive or complex areas such as the brain, spine, lungs, liver, and prostate with high precision.

CyberKnife is effective in treating a wide range of cancers and other conditions, including:

• Brain Tumors: Both primary and metastatic brain tumors.
• Lung Cancer: Early-stage lung cancer and metastatic lung lesions.
• Prostate Cancer: An alternative to surgery or traditional radiation therapy.
• Spinal Tumors: Tumors located in the spine or spinal cord.
• Liver Cancer: Primary and metastatic liver tumors.
• Pancreatic Cancer: Localized pancreatic tumors.
• Kidney Cancer: Primary kidney tumors and metastatic lesions.
• Arteriovenous Malformations (AVMs): Abnormal blood vessel formations in the brain.
• Trigeminal Neuralgia: A chronic pain condition affecting the trigeminal nerve.

CyberKnife is suitable for patients with tumours or lesions that require precise, non-invasive treatment. It is often recommended for individuals who:

• Have small to medium-sized tumours or lesions in the brain, spine, lungs, liver, pancreas, prostate, or other areas.
• Are not ideal candidates for traditional surgery due to medical conditions or tumour location.
• Seek a non-surgical alternative with minimal side effects and faster recovery.
• Have tumours located near critical structures where precision is essential.
• Require retreatment after previous radiation therapy.

A consultation with a specialist is necessary to determine whether CyberKnife is the best option based on individual health conditions and tumour characteristics.

The treatment involves multiple steps, including evaluation, imaging, treatment planning, and radiation delivery, all customised to the patient's needs.

Treatment Planning and Preparation

Evaluation

Before treatment, a thorough medical evaluation is conducted to assess the patient’s condition, medical history, and imaging results. The specialist determines if CyberKnife is the most appropriate treatment option.

Imaging and Treatment Planning

Advanced imaging techniques such as CT, MRI, or PET scans are used to create a detailed 3D map of the tumour. This helps the CyberKnife system accurately target the affected area while avoiding damage to surrounding tissues.

Fiducial Placement (If Required)

For tumours in areas that move with breathing, such as the lungs or abdomen, small gold markers (fiducials) may be placed near the tumour to help track its position during treatment. This ensures the radiation beams remain focused on the tumour, even if the patient moves slightly.

During Treatment

The patient lies on a treatment table while the CyberKnife robotic arm moves around them, delivering precisely targeted radiation from multiple angles. The system continuously tracks tumour movement and adjusts in real-time to maintain accuracy. Each session lasts between 30 to 90 minutes, depending on the treatment area. Since CyberKnife is non-invasive, there is no need for anaesthesia, and patients remain awake throughout the procedure.

Recovery and Aftercare

CyberKnife treatment requires little to no downtime, and most patients can resume normal activities immediately after the procedure. Follow-up appointments are scheduled to monitor treatment progress and assess tumour response. Patients may experience mild fatigue or temporary side effects depending on the treated area, but these typically resolve on their own.

CyberKnife is designed to minimise side effects by precisely targeting tumours while sparing healthy tissues. However, some patients may experience mild and temporary side effects, including:

• Fatigue
• Skin redness or irritation at the treatment site
• Mild swelling or discomfort in the treated area
• Temporary changes in bowel or urinary habits (for prostate treatments)

Severe side effects are rare, but patients are monitored closely to manage any concerns. Most side effects subside within a few days or weeks after treatment.

How long does a CyberKnife treatment session take?

A typical CyberKnife session lasts between 30 to 90 minutes, depending on the size, location, and complexity of the tumour. Most patients require only one to five sessions for a complete treatment.

Is CyberKnife treatment painful?

No, CyberKnife is a completely non-invasive procedure, meaning there are no incisions, no pain during treatment, and no need for anaesthesia. Patients remain awake and comfortable throughout the session.

Can CyberKnife be used to treat recurrent tumours?

Yes, CyberKnife is an excellent option for patients with recurrent tumours, even those who have previously undergone radiation therapy. Its precision allows retreatment while minimising exposure to healthy tissues.

How soon can I return to my normal activities after CyberKnife treatment?

Most patients can return to their normal daily activities immediately after treatment. There is little to no downtime, making CyberKnife a convenient option for those with busy schedules.

Can CyberKnife be used for non-cancerous conditions?

Yes, in addition to treating various cancers, CyberKnife is also used for non-cancerous conditions like arteriovenous malformations (AVMs) and trigeminal neuralgia, offering a non-surgical treatment option with high precision.

Is CyberKnife covered by insurance?

Coverage varies depending on the insurance provider and the specific condition being treated. Many insurance plans cover CyberKnife for medically necessary treatments, but patients should check with their insurance provider to confirm coverage.

Does CyberKnife require hospitalisation?

No, CyberKnife is an outpatient procedure. Patients do not need to stay overnight in the hospital and can go home the same day after their session.

How effective is CyberKnife compared to surgery?

CyberKnife offers comparable effectiveness to surgery for many tumours, especially for patients who are not candidates for surgery due to medical conditions or tumour location. Its high precision ensures effective tumour control while avoiding surgical risks.

Can CyberKnife be combined with other cancer treatments?

Yes, CyberKnife can be used alongside other treatments such as chemotherapy, immunotherapy, or traditional radiation, depending on the patient’s treatment plan and specific medical condition.

How does CyberKnife handle tumours that move with breathing?

CyberKnife continuously tracks tumour movement in real-time and adjusts the radiation beams accordingly. This allows for precise targeting of tumours in the lungs, liver, and other areas affected by breathing, without the need for breath-holding techniques.

How does CyberKnife compare to proton therapy?

Both CyberKnife and proton therapy are advanced radiation treatments, but CyberKnife offers real-time tumour tracking and robotic precision, allowing for highly targeted treatment without the need for rigid immobilisation. Proton therapy uses charged particles to deliver radiation but may not adjust as dynamically to tumour movement. The choice depends on the tumour type, location, and individual patient needs.

Is CyberKnife only for small tumours?

While CyberKnife is most commonly used for small to medium-sized tumours, it can also be effective for larger tumours or metastatic lesions, depending on their location and surrounding structures. A specialist will determine if it is suitable for a specific case.

Can CyberKnife be used for paediatric patients?

Yes, CyberKnife can be used to treat certain paediatric tumours, particularly in the brain and spine, where precision is crucial. However, treatment eligibility depends on the child's condition and overall health.

How soon will I see results after CyberKnife treatment?

The effects of CyberKnife treatment occur gradually. While some tumours shrink within weeks, others may take several months. Follow-up imaging and consultations help monitor progress over time.

What happens if I move during CyberKnife treatment?

CyberKnife’s advanced image-guided system continuously tracks the tumour’s position and makes real-time adjustments. Unlike conventional radiation, it can compensate for slight patient movements, ensuring accuracy without requiring total stillness.

Can CyberKnife treat multiple tumours at once?

Yes, CyberKnife can target multiple tumours in a single treatment session. This is particularly beneficial for patients with metastatic cancer, where tumours have spread to different areas of the body.

Does CyberKnife damage surrounding healthy tissues?

CyberKnife is designed to minimise damage to healthy tissues by delivering highly focused radiation beams directly to the tumour. Its precision reduces radiation exposure to surrounding organs, lowering the risk of side effects.

Can CyberKnife be used as a first-line treatment?

Yes, CyberKnife can be a primary treatment option for certain cancers, especially those in hard-to-reach or sensitive areas. It is also commonly used when surgery is not an option or when a non-invasive approach is preferred.

Are there dietary or activity restrictions before or after CyberKnife treatment?

There are generally no strict dietary or activity restrictions before or after CyberKnife treatment. Most patients can continue with their normal routines, although specific recommendations may be given based on the treatment site.

Is there a maximum number of CyberKnife treatments a person can receive?

There is no fixed limit, but the number of CyberKnife treatments a person can undergo depends on factors such as previous radiation exposure, tumour type, and overall health. A specialist will determine if additional treatments are safe and effective.

Review

Reviewed by Dr. Ashish Gautam, Senior Director – General, Laparoscopic & Robotic Surgery, General Surgery, Minimal Access Surgery, Bariatric Surgery / Metabolic, on 30th June 2025.