Friday 21 November 2014

'Proton therapy avoids a lot of the side-effects'

Proton treatment for cancer gets great results but its cost is prohibitive, writes Lisa Jewell

Earlier this year, the UK's National Health Service (NHS) announced a massive investment in proton therapy units in London and Manchester that will be built over the next three years.

These new facilities will cost £250m (€318m) and will deliver a treatment that uses high-energy proton particle beams to destroy cancer cells.

Despite the heavy investment, the NHS believes that they will save money in the long term. By 2014, it's estimated that it would be paying out £30m (€38m) a year for patients to travel overseas for the treatment.

But just what is this type of treatment and will it be introduced here in Ireland?

Unlike traditional radiotherapy, which uses X-rays, proton therapy extracts protons from the centre of the atom and these are then aimed at the cancerous tissue.

Radiation oncologist Dr William Hartsell is the Medical Director of Chicago's ProCure Centre, one of an American chain of private clinics that specialise in proton therapy.

"What's happening inside the tumour is basically the same with traditional radiotherapy and proton therapy," he says. "In that context, the proton therapy is slightly more effective but not by much.

"What we do see, though, with proton therapy is that there is not as much collateral damage to the tissue around the cancerous tissue and that is its huge benefit."

This is because the protons release their energy when they stop at their target rather than when they are travelling through tissue.

It's particularly important for cancers which are located in sensitive areas such as the front of the skull and the nose and throat areas. It's also a reason why proton therapy is used more for rarer tumours.

Proton therapy is also used in clinics like ProCure for certain types of paediatric brain cancer.

"How I got into proton therapy is that I had treated a lot of children over the years and it is a therapy that is best used in children," says Dr Hartsell, who has been a radiation oncologist for 25 years, including a couple of years working in the Irish health system.

"We know that radiation therapy is effective in killing cancer cells, but it kills normal cells too. With proton therapy, much more of that normal tissue is kept and we can avoid a lot of the side-effects."

Proton therapy has been used by some Irish patients under the Treatment Abroad Scheme.

The then four-year-old had a rare malignant brain tumour and was given just weeks to live by doctors in Ireland. She had chemotherapy in New York before the proton therapy in Massachusetts.

It was reported in the news at the time that the HSE paid for the six-week proton therapy as it's a treatment that was deemed medically necessary but was unavailable in Ireland. Megan returned home with her family to Cork last September and while she still undergoes MRI testing, her cancer has now gone.

Situations like Megan's are unusual and with less than five patients going abroad for proton therapy, there are no plans to provide the treatment in Ireland.

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