RT Journal Article T1 Definite and indeterminate nonalcoholic steatohepatitis share similar clinical features and prognosis: A longitudinal study of 1893 biopsy-proven nonalcoholic fatty liver disease subjects. A1 Ampuero, Javier A1 Aller, Rocio A1 Gallego-Duran, Rocio A1 Crespo, Javier A1 Abad, Javier A1 Gonzalez-Rodriguez, Agueda A1 Gomez-Camarero, Judith A1 Caballeria, Joan A1 Lo-Iacono, Oreste A1 Ibañez, Luis A1 Garcia-Samaniego, Javier A1 Martin-Mateos, Rosa A1 Frances, Ruben A1 Fernandez-Rodriguez, Conrado A1 Diago, Moises A1 Soriano, German A1 Andrade, Raul J A1 Latorre, Raquel A1 Jorquera, Francisco A1 Morillas, Rosa M A1 Escudero, Desam A1 Estevez, Pamela A1 Hernandez-Guerra, Manuel A1 Augustin, Salvador A1 Pareja-Megia, Maria Jesus A1 Banales, Jesus M A1 Aspichueta, Patricia A1 Benlloch, Salvador A1 Rosales, Jose Miguel A1 Salmeron, Javier A1 Turnes, Juan A1 Romero-Gomez, Manuel A1 HEPAmet Registry, K1 ballooning K1 fatty liver disease K1 inflammation K1 metabolic-associated fatty liver disease K1 natural coursesteatohepatitis K1 steatosis AB Histological score systems may not fully capture the essential nonalcoholic steatohepatitis (NASH) features, which is one of the leading causes of screening failure in clinical trials. We assessed the NASH distribution and its components across the fibrosis stages and their impact on the prognosis and their relationship with the concept of metabolic-associated fatty liver disease (MAFLD). Spanish multicenter study including 1893 biopsy-proven nonalcoholic fatty liver disease (NAFLD) patients from HEPAmet registry. NASH was diagnosed by NAS score ≥4 (including steatosis, ballooning and lobular inflammation) and fibrosis by Kleiner score. The presence of MAFLD was determined. Progression to cirrhosis, first episode of decompensated cirrhosis and death were collected during the follow-up (4.7 ± 3.8 years). Fibrosis was F0 34.3% (649/1893), F1 27% (511/1893), F2 16.5% (312/1893), F3 15% (284/1893) and F4 7.2% (137/1893). NASH diagnosis 51.9% (982/1893), and its individual components (severe steatosis, ballooning and lobular inflammation), increased from F0 (33.6%) to F2 (68.6%), and decreased significantly in F4 patients (51.8%) (P = .0001). More than 70% of non-NASH patients showed some inflammatory activity (ballooning or lobular inflammation), showing a similar MAFLD rate than NASH (96.2% [945/982] vs. 95.2% [535/562]) and significantly higher than nonalcoholic fatty liver (NAFL) subjects (89.1% [311/349]) (P  The prevalence of steatohepatitis decreased in advanced liver disease. However, most of these patients showed some inflammatory activity histologically and had metabolic disturbances. These findings should be considered in clinical trials whose main aim is to prevent cirrhosis progression and complications, liver transplant and death. PB Wiley-Blackwell Publishing Ltd. SN 1478-3223 YR 2021 FD 2021-08-16 LK http://hdl.handle.net/10668/17630 UL http://hdl.handle.net/10668/17630 LA en NO Ampuero J, Aller R, Gallego-Durán R, Crespo J, Abad J, González-Rodríguez Á, et al. Definite and indeterminate nonalcoholic steatohepatitis share similar clinical features and prognosis: A longitudinal study of 1893 biopsy-proven nonalcoholic fatty liver disease subjects. Liver Int. 2021 Sep;41(9):2076-2086. DS RISalud RD Jun 1, 2025