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Early intervention with tafamidis provides long-term (5 5-year) delay of neurologic progression in transthyretin hereditary amyloid polyneuropathy #MMPMID27494299
Waddington Cruz M; Amass L; Keohane D; Schwartz J; Li H; Gundapaneni B
Amyloid 2016[Jul]; 23 (3): 178-83 PMID27494299show ga
Transthyretin hereditary amyloid polyneuropathy, also traditionally known as transthyretin familial amyloid polyneuropathy (ATTR-FAP), is a rare, relentless, fatal hereditary disorder. Tafamidis, an oral, non-NSAID, highly specific transthyretin stabilizer, demonstrated safety and efficacy in slowing neuropathy progression in early-stage ATTRV30M-FAP in a 1.5-year, randomized, double-blind, placebo-controlled trial, and 1-year open-label extension study, with a second long-term open-label extension study ongoing. Subgroup analysis of the effectiveness of tafamidis in the pivotal study and its open-label extensions revealed a relatively cohesive cohort of patients with mild neuropathy (i.e. Neuropathy Impairment Score for Lower Limbs [NIS-LL]???10) at the start of active treatment. Early treatment with tafamidis for up to 5.5 years (?1 dose of tafamidis meglumine 20?mg once daily during the original trial or after switching from placebo in its extension) resulted in sustained delay in neurologic progression and long-term preservation of nutritional status in this cohort. Mean (95% CI) changes from baseline in NIS-LL and mBMI were 5.3 (1.6, 9.1) points and ?7.8 (?44.3, 28.8) kg/m2 × g/L at 5.5 years, respectively. No new safety issues or side effects were identified. These data represent the longest prospective evaluation of tafamidis to date, confirm a favorable safety profile, and underscore the long-term benefits of early intervention with tafamidis.Trial Registration: ClincalTrials.gov Identifier: NCT00409175, NCT00791492, and NCT00925002.