A hyperbaric oxygen chamber
Some side effects appear years after cancer treatment. That’s the case for one side effect of radiotherapy for head and neck cancer, called osteoradionecrosis.
This painful condition results from damage to the jaw bone, which often doesn’t heal properly and can cause bone fractures or even bone death.
It can develop without an obvious trigger, but it’s often linked to dental work like tooth extractions or implants. And it can happen even if the dental work is carried out 20 years after radiotherapy.
Professor Richard Shaw, a Cancer Research UK-funded head and neck surgeon at the University of Liverpool, treats the difficult condition quite frequently through reconstructive surgery.
Shaw says that these procedures are often bigger and harder than patients’ original cancer surgery, because they’ve already had so much treatment in that area.
For that reason, researchers have looked for ways to prevent osteoradionecrosis from developing. And that’s where hyperbaric oxygen comes in. It started with a small trial in the 80s, which has influenced the way doctors prepare patients for dental surgery ever since.
But new Stand Up To Cancer trial data, led by Shaw and published in the International Journal of Radiation Oncology, shows the hyperbaric oxygen hype may have been a bit premature.
The trial of hyperbaric oxygen
Back in the 1980s, a small trial in the US showed that giving hyperbaric oxygen before dental surgery could reduce the risk of osteoradionecrosis developing.
What is hyperbaric oxygen therapy?
Hyperbaric oxygen treatment involves sitting in a chamber where the oxygen is at a higher pressure than the air we normally breathe. It’s thought the increase in oxygen can help to promote healing. Sessions typically last 60-90 minutes.
“Prevention is obviously a very good idea, but I think there was concern around whether hyperbaric oxygen was the answer,” says Shaw.
A big question that lingered around the treatment was how applicable the 34-year-old trial results were to patient’s today. Radiotherapy has become a lot more targeted than it was a few decades ago, which may affect the risk of someone developing osteoradionecrosis.
“There really was no recent, good evidence for hyperbaric oxygen,” says Shaw.
No one wants to take the risk with our patients who, after all, had been cured of head and neck cancer and saw themselves as long-term survivors.
– Professor Richard Shaw
Adding to that, hyperbaric oxygen treatment takes time. Patients have to travel to a centre with a specialised chamber every day for 30 days.
And finally, the cost. According to Shaw, the NHS is spending somewhere between £5K and £10K per patient on hyperbaric oxygen treatment.
Expensive, intensive and based on potentially shaky evidence. The feeling was that it was time for hyperbaric oxygen to be put back to the test.
The verdict’s in
Shaw and his team ran a trial testing hyperbaric oxygen treatment in 144 patients who’d had head and neck cancer and now needed dental surgery. Half the patients had a course of hyperbaric oxygen before surgery, the other half didn’t.
Patients were then monitored after dental treatment to see who developed osteoradionecrosis, as well as monitoring pain levels and quality of life.