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He had four tiny scars in his eye where healthy copies of the gene were injected into the retina at the back of the eye through keyhole surgery.

A nurse has become the first person in the UK to undergo an operation that saw a tumour removed through her eye socket using keyhole surgery.

Keyhole surgery removed it, in July, and Mr Ball is now unlikely to need further treatment.

But keyhole surgery found no sign of it, sparking a "vicious cycle" of surgery and Prostap.

On the morning of the operation her mother's kidney was removed at Newcastle's Freeman Hospital via keyhole surgery and driven a few short miles to the Royal Victoria Infirmary to be transplanted into her daughter.