Elucidation of the biologic mechanisms underlying the pathogenesis of transthyretin (TTR) amyloidosis has led to the approval of therapies to treat both inherited (hATTR) and age-related or wild-type (wtATTR) forms of transthyretin amyloidosis manifesting as neuropathy and/or cardiomyopathy1-3. These developments have been hailed as a model of scientific and medical progress emanating from precision medicine, which can arrest or slow progression of fatal disorders and provide a potential pathway for progress in other complex clinical syndromes such as heart failure with preserved ejection fraction by endo-phenotyping.