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Natural history and therapy of TTR-cardiac amyloidosis: emerging disease-modifying therapies from organ transplantation to stabilizer and silencer drugs

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Abstract

Transthyretin-cardiac amyloidoses (ATTR-CA) are an underdiagnosed but increasingly recognized cause of heart failure. Extracellular deposition of fibrillary proteins into tissues due to a variety of inherited transthyretin mutations in ATTRm or due to advanced age in ATTRwt eventually leads to organ failure. In the heart, amyloid deposition causes diastolic dysfunction, restrictive cardiomyopathy with progressive loss of systolic function, arrhythmias, and heart failure. While traditional treatments have consisted of conventional heart failure management and supportive care for systemic symptoms, numerous disease-modifying therapies have emerged over the past decade. From organ transplantation to transthyretin stabilizers (diflunisal, tafamidis, AG-1), TTR silencers (ALN-ATTR02, ISIS-TTR(Rx)), and degraders of amyloid fibrils (doxycycline/TUDCA), the potential for effective transthyretin amyloid therapy is greater now than ever before. In light of these multiple agents under investigation in human clinical trials, clinicians should be familiar with the systemic cardiac amyloidoses, their differing pathophysiology, natural histories, and unique treatment strategies.

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Acknowledgments

We acknowledge the patients with cardiac amyloidosis who continue to participate in clinical trials and wait patiently for the development of effective treatments.

Conflict of interest

Dr. Castaño has no conflicts of interest or financial ties to disclose. Dr. Drachman has received funding as a scientific advisor to ISIS Pharmaceuticals. Dr. Judge has received funding as a scientific advisor to both Pfizer and Alnylam Pharmaceuticals. Dr. Maurer serves on the advisory board of the Transthyretin Amyloid Outcomes Survey (THAOS), which is funded by Pfizer, Inc., and has received unrestricted educational grant support from Alnylam Pharmaceuticals.

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Castaño, A., Drachman, B.M., Judge, D. et al. Natural history and therapy of TTR-cardiac amyloidosis: emerging disease-modifying therapies from organ transplantation to stabilizer and silencer drugs. Heart Fail Rev 20, 163–178 (2015). https://doi.org/10.1007/s10741-014-9462-7

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