June 18, 2018 07:41 AM EDT

Catalyst Bio shares bashed as neutralizing antibodies force investigators to freeze hemophilia cohort work

John Carroll

Editor & Founder

Shares of Catalyst Biosciences $CBIO were badly damaged in the wake of an alert that two patients in one cohort of their early-stage hemophilia drug study developed a neutralizing antibody after a course of therapy with their Factor IX (FIX) candidate CB 2679d/ISU304.

Investigators have now suspended treatment in cohort 6 and will stay on hold until they figure out what went wrong. The two patients were able to resume treatment with their prescribed IV FIX prophylaxis therapies.

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Catalyst Bio shares bashed as neutralizing antibodies force investigators to freeze hemophilia cohort work

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