Proton beam therapy is precision radiation with fewer side effects. This guide covers how it works, which cancers benefit most, treatment timelines, costs ($20K–$40K in India vs $100K+ in the US), and top centres worldwide.
What Is Proton Therapy?
Proton therapy is an advanced form of radiation therapy that uses protons instead of X-rays (photons) to treat cancer. The key advantage is the Bragg peak — protons deposit most of their energy precisely at the tumour depth and stop, minimising damage to surrounding healthy tissue.
This precision makes proton therapy especially valuable for cancers near critical structures like the brain, spinal cord, eyes, and heart, and for paediatric patients where minimising radiation exposure reduces long-term secondary cancer risk.
Proton vs Traditional Radiation (IMRT)
| Feature | Proton Therapy | IMRT (X-ray) |
|---|---|---|
| Dose distribution | Stops at tumour (Bragg peak) | Passes through body (exit dose) |
| Damage to nearby tissue | 50–60% less | Higher collateral dose |
| Session time | 15–30 minutes | 10–20 minutes |
| Total sessions | 20–35 (similar) | 25–35 (similar) |
| Best for | Paediatric, brain, base of skull, prostate | Most adult cancers (widely available) |
| Availability | ~120 centres worldwide | Every radiation department |
Cancers That Benefit Most
- Paediatric cancers — children's developing tissues are highly sensitive; proton therapy reduces secondary malignancies by 50%+ compared to X-ray radiation
- Brain & skull base tumours — chordoma, chondrosarcoma, meningioma near the brainstem
- Eye cancers — retinoblastoma, uveal melanoma — preserving vision
- Head & neck cancers — reduces salivary gland damage (less dry mouth)
- Prostate cancer — lower rectal and bladder dose, fewer long-term urinary/bowel side effects
- Liver cancer (HCC) — can treat tumours not suitable for surgery while preserving liver function
The Treatment Process
- Consultation & simulation (Day 1): imaging, custom immobilisation mask/mould creation
- Treatment planning (3–7 days): physicists and dosimetrists create a precision plan
- Daily sessions (4–7 weeks): 15–30 minutes each, 5 days per week, outpatient
- Follow-up imaging: MRI/CT scans at 3, 6, and 12 months post-treatment
Cost Comparison
| Country | Proton Therapy Cost | IMRT Cost (for comparison) |
|---|---|---|
| United States | $80,000–$150,000 | $20,000–$50,000 |
| India (Apollo, Tata) | $20,000–$40,000 | $3,000–$8,000 |
| South Korea | $30,000–$60,000 | $8,000–$15,000 |
| Czech Republic (PTC Prague) | $25,000–$45,000 | $5,000–$12,000 |
Where to Get Proton Therapy
Proton centres are expensive to build ($100M+), so availability is limited. Key centres accepting international patients:
- India — Apollo Proton Cancer Centre (Chennai), Tata Memorial (Mumbai — opening)
- South Korea — Samsung Medical Center (Seoul), National Cancer Center (Goyang)
- Czech Republic — Proton Therapy Center Prague (one of the busiest in Europe)
- Japan — National Institute of Radiological Sciences (Chiba), Tsukuba
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