The fibroblast hormone Endotrophin is a biomarker of mortality in chronic diseases.

Fibrosis, driven by fibroblast activities, is an important contributor to morbidity and mortality in most chronic diseases. Endotrophin, a signaling molecule derived from processing of type VI collagen by highly activated fibroblasts, is involved in fibrotic tissue remodeling. Circulating levels of endotrophin have been associated with an increased risk of mortality in multiple chronic diseases. We conducted a systematic literature review collecting evidence from original papers published between 2012 and January 2023 that reported associations between circulating endotrophin (PROC6) and mortality. Cohorts with data available to the study authors were included in an Individual Patient Data (IPD) meta-analysis that evaluated the association of PROC6 with mortality (PROSPERO registration number: CRD42023340215) after adjustment for age, sex and BMI, where available. In the IPD meta-analysis including sixteen cohorts of patients with different non-communicable chronic diseases (NCCDs) (N = 15,205) the estimated summary hazard ratio for 3-years all-cause mortality was 2.10 (95 % CI 1.75-2.52) for a 2-fold increase in PROC6, with some heterogeneity observed between the studies (I ² =70 %). This meta-analysis is the first study documenting that fibroblast activities, as quantified by circulating endotrophin, are independently associated with mortality across a broad range of NCCDs. This indicates that, irrespective of disease, interstitial tissue remodeling, and consequently fibroblast activities, has a central role in adverse clinical outcomes, and should be considered with urgency from drug developers as a target to treat.
Competing Interests: Declaration of competing interest Federica Genovese, Cecilie Bager, Peder Frederiksen, Dario Vazquez, Jannie Marie Bülow Sand, Diana Julie Leeming, Daniel Guldager Kring Rasmussen, Alexander Lynge Reese-Petersen, Neel I Nissen and Morten Karsdal are or have been at the time of writing, full-time employees at Nordic Bioscience. Federica Genovese, Cecilie Bager, Jannie Maria Bülow Sand, Diana Julie Leeming, Daniel Guldager Kring Rasmussen, Alexander Lynge Reese-Petersen and Morten Karsdal hold Nordic Bioscience stocks. Nordic Bioscience holds the patent for the PROC6 assays and commercializes the assay. Peter Rossing has received research support from Astra Zeneca, Novo Nordisk and Bayer, and has received honoraria (to Steno Diabetes Center Copenhagen) from Astra Zeneca, Boehringer Ingelheim, Bayer, Novo Nordisk, Gilead, Sanofi, Abbott for consultancy or education. Louise V. Wain has received research funding or collaborative support from Orion Pharma, GSK, Genentech, AstraZeneca and Sysmex, outside of the submitted work and provided consultancy for GSK and Galapagos.
(Copyright © 2024. Published by Elsevier B.V.)