Precision Radiotherapy and SBRT for Cancer: What Patients Should Know

Quick Answer: Precision radiotherapy is a broad term for radiation-treatment approaches designed to target a tumour accurately while limiting radiation exposure to surrounding healthy tissue as much as possible. Stereotactic body radiation therapy (SBRT), also called stereotactic ablative body radiotherapy (SABR), is one type of external-beam radiotherapy that delivers highly precise radiation to selected tumours in the body. It is not suitable for every cancer or every patient.

What Is Precision Radiotherapy?

Radiotherapy uses high-energy radiation to damage cancer cells and control or shrink tumours. Modern external-beam radiotherapy uses imaging, computerised treatment planning and specialised equipment to shape and direct radiation toward a defined treatment area.

“Precision radiotherapy” is a general descriptive term rather than one single treatment or machine. It can include different planning and delivery techniques depending on the tumour, treatment goal and equipment available.

What Is SBRT?

SBRT stands for stereotactic body radiation therapy. It is also called SABR, or stereotactic ablative body radiotherapy. SBRT uses specialised positioning and treatment-planning techniques to deliver radiation very precisely to selected tumours outside the brain.

Compared with many conventional radiotherapy schedules, SBRT commonly uses a higher radiation dose per treatment over fewer treatment sessions. The exact dose and schedule are determined by the radiation oncology team.

How Is SBRT Different From Conventional Radiotherapy?

Both are forms of radiation therapy, but their planning, dose per treatment, number of sessions and clinical uses can differ. SBRT places particular emphasis on accurate tumour localisation, patient positioning and precise delivery because relatively high doses may be delivered in a small number of treatments.

This does not mean SBRT is automatically “better” than conventional radiotherapy. The appropriate technique depends on the cancer type, tumour size and location, treatment goal, previous radiotherapy, nearby sensitive organs and other clinical factors.

What Cancers May Be Treated With SBRT?

SBRT may be considered for selected tumours outside the brain. Clinical use varies by cancer type and individual circumstances. Examples can include selected tumours or metastatic sites involving areas such as the lung, liver, prostate, pancreas, spine and other locations.

Being diagnosed with cancer in one of these organs does not automatically mean a patient is suitable for SBRT. A radiation oncologist needs to assess the individual tumour and treatment plan.

Can SBRT Be Used for Advanced or Stage 4 Cancer?

In selected patients with advanced cancer or stage 4 cancer, stereotactic radiotherapy may be considered for particular tumour sites. The purpose may vary—for example, local disease control or symptom management—depending on the clinical situation.

SBRT is a local treatment. It targets a defined area of the body and should not be interpreted as treatment for all cancer throughout the body. Patients with metastatic cancer may also require systemic therapy or other treatments as part of an overall oncology plan.

SBRT, SRS, CyberKnife, Gamma Knife and GyroKnife

Patients researching precision radiotherapy often encounter several related terms:

• SBRT/SABR: a stereotactic radiation technique used for selected targets in the body outside the brain.
• SRS: stereotactic radiosurgery, most commonly associated with highly focused radiation for targets in the brain or central nervous system.
• CyberKnife: a robotic radiation-delivery system that can be used for stereotactic treatments.
• Gamma Knife: a dedicated stereotactic radiosurgery system commonly used for intracranial targets.
• GyroKnife: a gamma-radiotherapy system that should be evaluated according to the specific device, clinical indication and available evidence.

These names should not be treated as interchangeable. The important question is which technique and treatment plan are appropriate for the individual patient. Patients specifically researching GyroKnife can read our GyroKnife cancer treatment guide.

What Happens Before Precision Radiotherapy?

The exact process varies, but treatment planning may involve:

1. Specialist assessment to determine whether radiotherapy is appropriate.
2. Imaging and simulation to define the treatment target and surrounding structures.
3. Positioning or immobilisation to help reproduce the patient’s position accurately during treatment.
4. Computerised treatment planning to determine radiation dose and beam delivery.
5. Quality and safety checks before and during treatment.

What Are the Possible Side Effects?

Radiotherapy can affect healthy tissue as well as cancer cells. Side effects depend strongly on the part of the body being treated, radiation dose, number of treatments, previous treatments and individual health factors. Patients should ask their radiation oncologist about both short-term and longer-term risks for their specific treatment area.

Questions to Ask a Radiation Oncologist

• Why is radiotherapy being recommended for my cancer?
• What is the goal of treatment?
• Why is SBRT or another precision technique being considered?
• Is conventional radiotherapy another reasonable option?
• How many treatment sessions are expected?
• What side effects or risks are important for this tumour location?
• Have I received radiation to this area before, and does that affect the plan?
• Will I also need systemic treatment or another cancer treatment?
• How will the medical team assess my response after treatment?

Considering Precision Radiotherapy in China or Overseas

Patients exploring cancer treatment in China or another country may encounter hospitals offering SBRT and other precision-radiotherapy technologies. A particular machine or technology should not be the only reason to choose an overseas hospital.

The medical team should first assess the diagnosis, imaging, previous treatment and treatment target. Patients can also consider a cancer second opinion before deciding whether overseas treatment is appropriate.

How AGH Medical Supports Patients

AGH Medical is not a hospital and does not diagnose cancer, prescribe radiotherapy, perform SBRT or determine treatment suitability. AGH’s role is to support patients with medical-information organisation and specialist or hospital coordination.

• Organising medical reports and imaging information for review
• Coordinating specialist or multidisciplinary assessment where appropriate
• Helping patients communicate with relevant hospitals and medical teams
• Supporting practical coordination if patients proceed with treatment in China or overseas

Patients can explore institutions through the AGH Medical Network or review the AGH Care Journey.

Frequently Asked Questions

Is SBRT a type of surgery?

No. SBRT is external-beam radiation therapy. It does not involve surgically removing a tumour.

Is SBRT the same as radiotherapy?

SBRT is one form of external-beam radiotherapy. Radiotherapy is a much broader category that includes several treatment techniques.

Does SBRT always require only one treatment?

No. SBRT is commonly delivered over a small number of treatment sessions, but the exact schedule depends on the tumour, treatment plan and specialist assessment.

Is SBRT suitable for every stage 4 cancer patient?

No. Suitability depends on factors such as the number and location of treatment targets, cancer type, previous treatment, nearby normal tissues and the overall oncology plan.

Is SBRT better than GyroKnife or CyberKnife?

These terms do not describe directly equivalent things. SBRT is a treatment technique, while some other names refer to specific treatment systems or platforms. A radiation oncologist should determine which approach is appropriate for the individual case.

Can AGH Medical decide whether I need SBRT?

No. AGH Medical can coordinate medical review and communication, but radiotherapy recommendations and treatment suitability must be determined by qualified medical specialists.

Request a Specialist Review

If precision radiotherapy or SBRT has been suggested to you, or you want another specialist to review your cancer treatment options, you can contact AGH Medical and submit your available medical reports for coordination.

Medical Disclaimer: This page is for general informational purposes only and does not replace professional medical advice, diagnosis or treatment. AGH Medical is not a hospital and does not diagnose cancer, prescribe radiotherapy, perform SBRT or determine treatment suitability. SBRT and other precision-radiotherapy techniques are not appropriate for every tumour or every patient. Treatment selection, radiation dose, number of sessions, potential benefits, risks and alternatives must be assessed by a qualified radiation oncologist and the treating medical team. References to a technology, treatment technique or hospital do not constitute an endorsement, recommendation, guarantee of eligibility or guarantee of treatment outcome.