Six-Month Clinical Data from Patisiran Phase 2 Open-Label Extension (OLE) Study

Six-Month Clinical Data from Patisiran Phase 2 Open-Label Extension (OLE) Study

We announced six-month clinical data from our ongoing Phase 2 open-label extension (OLE) study with patisiran (ALN-TTR02) for the treatment of transthyretin (TTR)-mediated amyloidosis (ATTR) in patients with familial amyloidotic polyneuropathy (FAP).  Data were presented at the American Neurological Association’s 2014 Annual Meeting held October 12 – 14, 2014 in Baltimore.  Results showed a mean 0.95 point decrease in modified Neuropathy Impairment Score (mNIS+7) at six months in 19 patients.  This decrease in neuropathy progression compares favorably with the 7-to-10 point increase in mNIS+7 at six months that can be estimated from historical data sets in untreated FAP patients with similar baseline characteristics.  In addition, patisiran treatment achieved a sustained mean serum TTR knockdown at the 80% target level for over nine months, with an up to 89.6% knockdown achieved between doses.  Patisiran was found to be generally well tolerated in this study out to one year of therapy, with no drug-related serious adverse events to date, and all 27 patients enrolled in the study continue to receive drug treatment.   Infusion-related reactions were infrequent (14.8%), mild in severity, and did not result in any discontinuations.  All other reported adverse events were mild to moderate, and there were no clinically significant changes in liver function tests, renal function tests, or other laboratory or hematological parameters.




These preliminary clinical activity and safety data from this open-label study with patisiran are quite encouraging.  In particular, the possible stabilization in neuropathy impairment scores at six months may have important implications for patients suffering from this debilitating, progressive and life-threatening disease.  These data will be increasingly meaningful as we monitor neuropathy progression in patisiran-treated patients over time.  We will continue to treat patients on our OLE study, and are enrolling FAP patients in our APOLLO Phase 3 study in sites around the world.



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