In a first-in-human trial (NI006-101), the monoclonal antibody cliramitug, targeting misfolded transthyretin, demonstrated a favorable safety profile and time- and dose-dependent reductions in surrogate markers of cardiac amyloid burden over the course of 12 months in patients with amyloid transthyretin cardiomyopathy (ATTR-CM). Here we evaluate the long-term safety and effcacy of cliramitug in a subgroup of participants of the NI006-101 trial who continued treatment in a second open-label extension (OLE2) and further explore dose- and time-dependent effects on amyloid depletion, cardiac biomarkers and cardiac structure and function. Twenty-three participants (20 receiving background treatment with tafamidis, all male) entered OLE2 and received a median of 10 additional infusions, increasing the maximum total exposure to 24 infusions and extending the median follow-up to 29.3 months. 

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