{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,3]],"date-time":"2026-11-03T15:12:48Z","timestamp":1793718768295,"version":"4.6.1"},"reference-count":45,"publisher":"eLife Sciences Publications, Ltd","license":[{"start":{"date-parts":[[2025,5,23]],"date-time":"2025-05-23T00:00:00Z","timestamp":1747958400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2025,5,23]],"date-time":"2025-05-23T00:00:00Z","timestamp":1747958400000},"content-version":"am","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2025,5,23]],"date-time":"2025-05-23T00:00:00Z","timestamp":1747958400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100009592","name":"Beijing Municipal Science and Technology Commission, Adminitrative Commission of Zhongguancun Science Park","doi-asserted-by":"publisher","award":["Z191100006619081"],"award-info":[{"award-number":["Z191100006619081"]}],"id":[{"id":"10.13039\/501100009592","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["82073390"],"award-info":[{"award-number":["82073390"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Young Elite Scientists Sponsorship Program","award":["2023QNRC001"],"award-info":[{"award-number":["2023QNRC001"]}]}],"content-domain":{"domain":["elifesciences.org"],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:sec id=\"abs2\">\n                    <jats:title>Background:<\/jats:title>\n                    <jats:p>Retroperitoneal liposarcoma (RPLS) is a critical malignant disease with various clinical outcomes. However, the molecular heterogeneity of RPLS was poorly elucidated, and few biomarkers were proposed to monitor its progression.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"abs3\">\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>\n                      RNA sequencing was performed on a training cohort of 88 RPLS patients to identify dysregulated genes and pathways using clusterProfiler. The GSVA algorithm was utilized to assess signaling pathway levels in each sample, and unsupervised clustering was employed to distinguish RPLS subtypes. Differentially expressed genes (DEGs) between RPLS subtypes were identified to construct a simplified dichotomous clustering via nonnegative matrix factorization. The feasibility of this classification was validated in a separate validation cohort (n=241) using immunohistochemistry (IHC) from the REtroperitoneal SArcoma Registry (RESAR). The study is registered with\n                      <jats:ext-link ext-link-type=\"uri\" xlink:href=\"https:\/\/clinicaltrials.gov\/\">https:\/\/clinicaltrials.gov\/<\/jats:ext-link>\n                      under number NCT03838718.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"abs4\">\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>Cell cycle, DNA damage and repair, and metabolism were identified as the most aberrant biological processes in RPLS, enabling the division of RPLS patients into two distinct subtypes with unique molecular signatures, tumor microenvironment, clinical features, and outcomes (overall survival [OS] and disease-free survival [DFS]). A simplified RPLS classification based on representative biomarkers (LEP and PTTG1) demonstrated high accuracy (area under the curve [AUC]&gt;0.99), with patients classified as LEP+ and PTTG1-, showing lower aggressive pathological composition ratio and fewer surgery times, along with better OS (HR = 0.41, p&lt;0.001) and DFS (HR = 0.60, p=0.005).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"abs5\">\n                    <jats:title>Conclusions:<\/jats:title>\n                    <jats:p>Our study provided an ever-largest gene expression landscape of RPLS and established an IHC-based molecular classification that was clinically relevant and cost-effective for guiding treatment decisions.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"abs6\">\n                    <jats:title>Funding:<\/jats:title>\n                    <jats:p>This work was supported by grants from the Beijing Municipal Science and Technology Project (Z191100006619081), National Natural Science Foundation of China (82073390), and Young Elite Scientists Sponsorship Program (2023QNRC001). The study sponsors had no role in the design and preparation of this manuscript.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"abs7\">\n                    <jats:title>Clinical trial number:<\/jats:title>\n                    <jats:p>\n                      <jats:related-object document-id=\"NCT03838718\" document-id-type=\"clinical-trial-number\" id=\"RO1\" source-id=\"ClinicalTrials.gov\" source-id-type=\"registry-name\" source-type=\"clinical-trials-registry\" xlink:href=\"https:\/\/clinicaltrials.gov\/show\/NCT03838718\">NCT03838718<\/jats:related-object>\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.7554\/elife.100887","type":"journal-article","created":{"date-parts":[[2025,1,31]],"date-time":"2025-01-31T08:25:07Z","timestamp":1738311907000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.100887","source":"Crossref","is-referenced-by-count":1,"title":["Molecular feature-based classification of retroperitoneal 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