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A one-time hemophilia A treatment from Pfizer (PFE) and Sangamo Therapeutics (SGMO) showed promising results in a small, early-stage study, pointing to a possible future in which patients might have a handful of curative options for the rare bleeding disorder.

In an ongoing 10-patient trial, the treatment boosted the production of factor VIII, a protein that is key to forming blood clots and is lacking in people with hemophilia A, according to data presented Saturday. Three patients getting the highest dose — the one Pfizer and Sangamo plan to use in future trials — saw their factor VIII levels returned to normal, and bleeds were reduced to zero. A fourth patient was dosed too recently to draw any conclusions.

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