Acute Promyelocytic Leukemia in the Real World: Understanding Outcome Differences and How We Can Improve Them.

Simple Summary: The introduction of all-trans retinoic acid (ATRA) and arsenic trioxide (ATO) has greatly improved the treatment of acute promyelocytic leukemia (APL), leading to high remission and survival rates. However, real-world outcomes are worse than those seen in clinical trials, largely due to the exclusion of older patients and those with comorbidities from trials. Moreover, the results from clinical trials overlook patients who die of APL complications before registering for trials. Delays in diagnosis and treatment, along with the limited experience and resources of some community healthcare centers in managing APL and its complications contribute to higher early mortality rates. Ongoing education and collaboration between local healthcare providers and specialists are vital to improve APL outcomes. Regular monitoring for disease recurrence and management of treatment side effects are also important. Additionally, understanding the phenomenon of APL clusters—groups of cases over specific times or areas—can help improve resource allocation for better outcomes. The advent of all-trans retinoic acid (ATRA) and arsenic trioxide (ATO) has revolutionized the treatment of acute promyelocytic leukemia (APL), resulting in excellent rates of remission and long-term survival. However, real-world outcomes often fall short of those observed in clinical trials due to various factors related to patient demographics and clinical practices. This review examines APL treatment outcomes in real-world settings and highlights the phenomenon of APL clusters. Clinical trials frequently exclude older patients and individuals with significant comorbidities, yet these groups represent a substantial portion of patients in clinical practice. Early mortality remains high in real-world settings, compounded by delayed diagnosis and treatment initiation, as well as the inexperience of some community providers and limited resources of their centers in managing APL and its associated complications. High rates of disease and induction-related complications further exacerbate early mortality. Continuous education and collaboration between community healthcare centers and expert institutions are essential, and international partnerships between resource-limited settings and expert centers can improve global APL outcomes. Ongoing monitoring for measurable residual disease (MRD) recurrence and long-term treatment toxicity, coupled with comprehensive patient evaluations, and experienced management, can enhance long-term outcomes. The clustered incidence of APL, while frequently reported, remains poorly understood. Regular reporting of these clusters could provide valuable insights into disease pathology and aid in developing predictive models for APL incidence, which would guide future resource allocation. [ABSTRACT FROM AUTHOR]