2 November 2012 Last updated at 07:00 ET By James Gallagher Health and science reporter, BBC News

A treatment which corrects errors in a person's genetic code has been approved for commercial use in Europe for the first time.

The European Commission has given Glybera marketing authorisation, meaning it can be sold throughout the EU.

It is a gene therapy for a rare disease which leaves people unable to properly digest fats.

The manufacturers say it will be available next year.

Gene therapy has a simple premise. If there is a problem with part of a patient's genetic code then change the code.

However, the field has been plagued with problems. Patients have developed leukaemia and in one trial in the US a teenager died.

In Europe and the US, the therapies are used only in research labs.

Glybera is used to treat lipoprotein lipase deficiency. One in a million people have damaged copies of a gene which is essential for breaking down fats.

It means fat builds up in the blood leading to abdominal pain and life-threatening inflammation of the pancreas (pancreatitis).

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Europe backs first gene therapy

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