Song SO, Yun JS, Ko SH, et al. - Researchers conducted the study for analyzing the hospital-based prevalence and clinical features of fulminant type 1 diabetes mellitus (FT1DM) in Korea. Between January 2012 and June 2017, all patients with diabetes who regularly attended the Endocrinology outpatient clinics at eight centers for a period >1 year were identified. Seventy-six thousand three hundred nine patients with diabetes had been regularly followed up during this period. In this research, the prevalence of T1DM was 1.2% among all diabetes patients, and FT1DM was 3.2% among those newly diagnosed with T1DM. HbA1c levels were lower in FT1DM patients than in non-FT1DM patients at diagnosis and at the last follow-up examination.