Background: The optimal management of patients with ST-segment elevation myocardial infarction (STEMI) presenting late->12 hours following symptom onset-is still under debate., Objectives: The purpose of this study was to describe characteristics, temporal trends, and impact of revascularization in a large population of latecomer STEMI patients., Methods: The authors analyzed the data of 3 nationwide observational studies from the FAST-MI (French Registry of Acute ST-elevation and non-ST-elevation Myocardial Infarction) program, conducted over a 1-month period in 2005, 2010, and 2015. Patients presenting between 12 and 48 hours after symptom onset were classified as latecomers., Results: A total of 6,273 STEMI patients were included in the 3 cohorts, 1,169 (18.6%) of whom were latecomers. After exclusion of patients treated with fibrinolysis and patients deceased within 2 days after admission, 1,077 patients were analyzed, of whom 729 (67.7%) were revascularized within 48 hours after hospital admission. At 30-day follow-up, all-cause death rate was significantly lower among revascularized latecomers (2.1% vs 7.2%; P < 0.001). After a median follow-up of 58 months, the rate of all-cause death was 30.4 (95% CI: 25.7-35.9) per 1,000 patient-years in the revascularized latecomers group vs 78.7 (95% CI: 67.2-92.3) per 1,000 patient-years in the nonrevascularized latecomers group (P < 0.001). In multivariate analysis, revascularization of latecomer STEMI patients was independently associated with a significant reduction of mortality occurrence during follow-up (HR: 0.65 [95% CI: 0.50-0.84]; P = 0.001)., Conclusions: Coronary revascularization of latecomer STEMI patients is associated with better short and long-term clinical outcomes., Competing Interests: Funding Support and Author Disclosures The French Society of Cardiology received grants for supporting the FAST-MI program from Amgen, AstraZeneca, Bayer, Bristol Myers Squibb, Boehringer Ingelheim, Daiichi Sankyo, Eli Lilly, Merck Sharp and Dohme, Pfizer, and Sanofi. None of the companies had a role in the design and conduct of the study, data collection, and management. They were not involved in the analysis and interpretation of the data, nor in the preparation, review, or approval of the manuscript. Dr Bouisset has received personal fees from Merck Sharp and Dohme, Abbott, Bayer, B-Braun, and Amgen. Dr Gerbaud has served as a consultant for Terumo. Prof Coste has received personal fees from Amgen, Sanofi, Servier, AstraZeneca, and Abiomed. Prof Puymirat has received fees for lectures and/or consulting from Amgen, AstraZeneca, Bayer, Biotronik, Bristol Myers Squibb, Boehringer Ingelheim, Daiichi Sankyo, Lilly, Merck Sharp and Dohme, The Medicine Company, Sanofi, St Jude Medical, Servier, and Siemens. Dr Belle has received unrestricted grants for research from Boston Scientific, Medtronic, Abbott, and Biotronik; and has received speaker fees from and served as a consultant for AstraZeneca and Merck Sharp and Dohme. Dr Delmas has received consulting fees from Boston Scientific; has received grants/research support from Maquet, Abiomed, Abbott, and Terumo; and has received lecture fees from Abiomed, Thoratec, and Abbott. Prof Cayla has received speaker or congress fees and research grants/consultant fees/ lectures fees from Amgen, AstraZeneca, Abbott, Bayer, Biotronik, Bristol Myers Squibb, Pfizer, and Sanofi-Aventis. Prof Motreff has received consulting fees from Terumo and Abbott Medical. Prof Lemesle has received personal fees from Amgen, AstraZeneca, Bayer, Boehringer Ingelheim, Bristol Myers Squibb, Merck Sharp and Dohme, Daiichi-Sankyo, Lilly, Mylan, Novartis, Novo Nordisk, Pfizer, Sanofi Aventis, and Servier. Prof Schiele has received personal fees from Amgen, AstraZeneca, Bayer, Bristol Myers Squibb, Merck Sharp and Dohme, Pfizer, and Sanofi. Prof Simon has received grants from AstraZeneca, Daiichi Sankyo, Eli Lilly, GlaxoSmithKline, Merck Sharp and Dohme, Novartis, and Sanofi; and has received personal fees for board membership and/or consultancy and/or lectures from AstraZeneca, Bristol Myers Squibb, Sanofi, and Novartis. Prof Danchin has received grants, speaker fees, consulting fees, or nonfinancial support from Amgen, AstraZeneca, Bayer, Bristol Myers Squibb, Boehringer Ingelheim, Intercept, NovoNordisk, Pfizer, Sanofi, and Servier. Prof Ferrières has received grants and personal fees from Akcea, Amarin, Amgen, Merck Sharp and Dohme, Sanofi, and Servier. All other authors have reported that they have no relationships relevant to the contents of this paper to disclose., (Copyright © 2021 American College of Cardiology Foundation. Published by Elsevier Inc. All rights reserved.)