biostudies-literatureLischetti USwiss National Science FoundationWellcome TrustKrebsliga Schweiz (Ligue Suisse Contre le Cancer)Krebsliga Schweiz849https://www.ebi.ac.uk/biostudies/studies/S-EPMC12828041biostudies-literatureUnknown17(1)The omentum, a visceral adipose tissue with critical metabolic, immunological, and stem cell functions is the preferred site for ovarian cancer metastasis. However, its role in maintaining homeostasis and its responses to metastatic colonization remain incompletely understood. Using single-cell transcriptomics, we profile different anatomical regions of the omentum in patients with benign conditions and metastasis. We catalog the benign omentum and observe a stable cell type composition and a preserved stem and progenitor niche. Upon metastatic colonization, we report on increased immune heterogeneity and a concomitant reduction of mesothelial and progenitor cells. The lesser omentum, which is not routinely removed during surgical debulking, is identified as a premetastatic niche characterNature communicationsOvarian cancer metastasis to the human omentum disrupts organ homeostasis and induces fundamental tissue reprogramming.PMC12828041171037220706KFS-5389-08-2021Lombardo FBeisel CLischetti UHensler MFucikova JDondi AHeinzelmann-Schwarz VCarrara MGoetze SBeerenwinkel NMontavon CLiang CYCoelho RKurzeder CHanns ASinger FJacob FfalseOvarian cancer metastasis to the human omentum disrupts organ homeostasis and induces fundamental tissue reprogramming.The omentum, a visceral adipose tissue with critical metabolic, immunological, and stem cell functions is the preferred site for ovarian cancer metastasis. However, its role in maintaining homeostasis and its responses to metastatic colonization remain incompletely understood. Using single-cell transcriptomics, we profile different anatomical regions of the omentum in patients with benign conditions and metastasis. We catalog the benign omentum and observe a stable cell type composition and a preserved stem and progenitor niche. Upon metastatic colonization, we report on increased immune heterogeneity and a concomitant reduction of mesothelial and progenitor cells. The lesser omentum, which is not routinely removed during surgical debulking, is identified as a premetastatic niche character2025-01-01T00:00:00Z2025 Dec2026-06-06T22:07:14.485Z2026-06-05T03:12:11.938ZS-EPMC128280414139797210.1038/s41467-025-67557-z