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UniQure, the Dutch gene therapy company, said Monday that it had temporarily halted the clinical development of its hemophilia B treatment after a patient was diagnosed with liver cancer.

The clinical hold, mandated by the Food and Drug Administration, encompasses three ongoing studies of Uniqure’s hemophilia B gene therapy called etranacogene dezaparvovec. Patient dosing in all three studies had already been completed and there is no plan to enroll or treat new patients, the company said.

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Shares of Uniqure fell 20% to $36 in early Monday trading.

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