New York — A first in-human study using the gene-editing tool Crispr has a company named after the technology and its partner, Vertex Pharmaceuticals, claiming an early victory in treating two inherited blood disorders.

Crispr Therapeutics and Vertex said a pair of patients — one suffering from beta thalassemia and the other with severe sickle cell disease — saw benefits from one-time treatment with CTX001. While they’ve been followed for just nine months and four months, respectively, their painful flare-ups and once-routine need for blood transfusions stopped after getting the therapy. Both developed severe complications including infections that were deemed unrelated to the gene-editing treatment...

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