Ionis Antisense Platform Safety Questioned After Thrombocytopenia Seen In Studies

GSK halts plans for Phase III study of antisense candidate in FAC due to FDA clinical hold for findings of reduced platelet counts in another Phase III trial; Ionis reveals similar findings in Phase III study of another antisense compound.

Ionis Pharmaceuticals Inc. tried to put the most positive face on safety concerns with its entire second-generation antisense program during an investor call May 26, saying "less than a handful of patients" in an ongoing Phase III study had shown reduced platelet counts, but analysts came away citing at least the possibility of a class effect for second-generation antisense candidates generated by Ionis' platform.

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