“…Modern estimates of mortality are lacking, particularly in the United States, where, until recently, there were no multi-institutional registries on which to base their estimates. There are also few data reports on how mortality from iTTP has improved over time as a result of advances in the earlier recognition, diagnosis, and management of iTTP, including the development of clinical diagnostic scores, [2][3][4] clinical guidelines, [5][6][7] and education programs. 8 The United States Thrombotic Microangiopathies (USTMA) iTTP registry contains data on 770 patients with iTTP from 15 high-volume centers across the United States between 1985 and 2019.…”