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Does Bristol Nuc’s Possible Cardiac Toxicity Portend A Class Effect?

Bristol-Myers Squibb has halted study of its Phase II nucleoside polymerase inhibitor for hepatitis C due to one trial patient suffering heart failure. It remains unclear if that event is related to the study drug, but do repeated toxicity issues with “nucs” indicate a class effect?

Of seven nucleoside polymerase inhibitors (aka “nucs”) that have reached Phase II in development for hepatitis C, five have faced significant safety hurdles, with Bristol-Myers Squibb Co.’s halt of a Phase II trial for its nuc, BMS-986094, due to a trial participant suffering heart failure just the latest occurrence. While Bristol has stopped dosing in that trial to review relevant patient data to ascertain a possibly safety risk with BMS094, some Wall Street analysts are wondering whether there is a class-wide safety issue with nucs.

Prior to Bristol’s Aug. 1 announcement, nucs such as Roche’s R1626, Novartis AG and Idenix Pharmaceuticals Inc.’s...

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