Alnylam Pharmaceuticals (ALNY) was out Thursday with positive topline results from the interim analysis of the ENVISION phase 3 study of givosiran, an investigational RNAi therapeutic targeting aminolevulinic acid synthase 1 (ALAS1) for the treatment of acute hepatic porphyria (AHP).

The company said that results of the interim analysis showed that givosiran treatment was associated with a statistically significant reduction in urinary ALA levels in acute intermittent porphyria (AIP) patients, relative to placebo.

Akshay Vaishnaw, president of research and development, said: “With these interim results in hand, we plan to meet with the FDA to discuss the results and the overall benefit-risk profile for a potential NDA submission at or around year-end in support of an Accelerated Approval. In the meantime, with enrollment in ENVISION completed ahead of schedule, we look forward to reporting topline results for the full study early next year. If clinical efficacy and acceptable safety are confirmed in the full study, we believe givosiran has the potential to transform the lives of patients living with an AHP.”

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