In a clinical study of genetically modified stem cells, 9 out of 10 children born with severe combined immunodeficiency — ‘bubble-boy disease’ — a potentially lethal condition in which a person’s immune system does not function properly, are doing well up to 8 years after treatment.

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In a clinical study of genetically modified stem cells, 9 out of 10 children born with severe combined immunodeficiency — ‘bubble-boy disease’ — a potentially lethal condition in which a person’s immune system does not function properly, are doing well up to 8 years after treatment.