A genetic defect that means his blood did not caught the slightest injury used to mean severe bleeding.

11 have roughly normal levels of blood clotting proteins they've had to inject themselves with.

Fact eight every other day.

Walking to master work used to be unthinkable for Jake Omar.

He was born with hemophilia A a genetic defect that means his blood did not hot the slightest injury used to mean severe bleeding.

Even a long stroll would cause bleeding in his joints.

But no more.

I think the gene therapy has hopefully given me a new lease of life.

It's gonna allow me when as my boys grow up to be a lot more active of the toe, kick footballs around to climb trees than to have to run around in the park with, um, not be someone who's got to worry about one doing hello.

Jake was one of 13 patients given pioneering gene therapy last year.

Ah, virus was used to give his body new genetic instructions for clotting blood.

All of the trial patients are off their hemophilia.

Medication on 11 have roughly normal levels of blood clotting proteins.

This is huge.

Its groundbreaking because the option to think about normalizing levels in patients with severe hemophilia is absolutely mind blowing toe offer people the potential of a normal life when they've had to inject themselves with Factor eight.

Every other day to prevent leading is transformational.

Large studies will now take place to see if gene therapy can replace these regular injections and truly transformed the lives of patients.