A father from Cambridge has helped launch a clinical trial into a drug that could prevent both his sons developing a serious genetic illness they are carrying.
Black Bone disease progresses during adulthood, and causes brittle bones and heart disease.
Dr Nick Sireau gave up work four years ago to concentrate on finding a drug to stop its progress and help cure the condition so his boys may never have to suffer the pain of its symptoms.
Shortly after they were born first Julien then Daniel Sireau were diagnosed with Black Bone Disease - a condition every bit as dreadful as its name implies.
Their father Nick wasn't prepared to accept that no treatment was possible.
Black Bone Disease or Alkaptonuria to give is its medical name, is a very rare and complex condition affecting around one in every half a million people.
Symptoms include black urine, dark coloured spots in the eyes and discoloured ears.
Sufferers often develop early onset osteoarthritis, which turns the bones black and brittle.
There is also the risk of kidney and bladder stones and even heart disease.
Nick Sireau left his job and set up a charity to help organise a clinical trial.
The AKU Society now employs five people. They believe an existing drug Nitisinone can prevent the build up of a toxic acid caused by a malfunctioning enzyme which attacks bone and cartilage.
Now clinical trials are being launched in Liverpool, Paris and Slovakia.