Proton Therapy: Cost, Centres and Who Genuinely Needs It

Proton therapy is the most talked-about form of radiotherapy and the most misunderstood. Its advantage is real but narrow: protons deposit their energy at a set depth and then stop, so there is no exit dose beyond the tumour. For a child, or for a tumour pressed against the brainstem, that difference matters enormously. For many common cancers, it changes very little.

The physics in one paragraph

Conventional radiotherapy uses photons, which lose energy gradually and continue through the body, delivering a dose before and after the target. Protons behave differently: they travel to a depth determined by their energy, release most of their dose there — the Bragg peak — and stop. The tumour gets its dose; the tissue behind it gets almost none.

Who genuinely benefits

• Children with any solid tumour, where reducing dose to growing tissue lowers the risk of a second cancer decades later.
• Tumours of the skull base, spine and eye, where the target sits millimetres from the brainstem, spinal cord or optic nerve.
• Re-irradiation, when an area has already received close to its lifetime photon dose.
• Selected head and neck tumours where sparing the salivary glands and swallowing muscles preserves quality of life.
• Certain paediatric and adult brain tumours requiring long-term neurological preservation.

Where the case is weaker

For prostate cancer and most breast cancers, randomised evidence has not shown protons to control the tumour better or to reduce meaningful side effects compared with modern photon techniques such as IMRT, VMAT and stereotactic radiotherapy. Those techniques are widely available, far cheaper, and already very conformal. Being offered protons for a common tumour is not automatically an upgrade; ask what specific organ the plan is trying to spare and by how much.

Cost and availability

A proton centre needs a particle accelerator, a building designed around it and a large physics team, which is why only a limited number exist worldwide and why insurers scrutinise every request. Modern photon radiotherapy — including IMRT, VMAT and stereotactic treatment — is delivered routinely at accredited hospitals in İstanbul and Ankara at roughly a quarter of U.S. prices, which for most indications is the practical comparison that matters.

How to decide without hype

1. Ask for the dose-volume comparison: which organ receives less dose with protons, and how much less?
2. Ask whether that difference has been shown to change symptoms or survival in your specific tumour.
3. Ask what a modern photon plan at an experienced centre would look like for the same case.
4. Compare total cost, waiting time and weeks away from home for both options.
5. If the answer is uncertain, get a radiation oncologist's second opinion before committing.

Frequently asked questions

Is proton therapy always better than normal radiotherapy?

No. It is better at avoiding dose beyond the target, which matters when a critical organ sits right behind the tumour or when the patient is a child. In many adult cancers a modern photon plan achieves the same tumour dose with no clinically meaningful difference.

Will my insurer pay for proton therapy?

Often only for the accepted indications — paediatric tumours, skull base and eye tumours, and re-irradiation. For prostate or breast cancer, many U.S. insurers refuse and require an appeal supported by a dosimetric justification from the radiation oncologist.

Can I get proton therapy in Türkiye?

Proton centres are scarce everywhere, so the honest answer for most patients is that the realistic choice in Türkiye is advanced photon radiotherapy — IMRT, VMAT, stereotactic radiosurgery — delivered on current equipment by experienced teams. If your case is one of the narrow proton indications, we will say so rather than sell you an alternative.