{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,21]],"date-time":"2026-10-21T20:38:18Z","timestamp":1792615098462,"version":"4.5.0"},"reference-count":71,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,8,10]],"date-time":"2026-08-10T00:00:00Z","timestamp":1786320000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Cell Dev. Biol."],"abstract":"<jats:p>HOX transcript antisense intergenic RNA (HOTAIR) is classically definedas an intracellular long non-coding RNA that scaffolds PRC2\/LSD1 to remodel chromatin and functions as a competing endogenous RNA. Its detection in extracellular vesicles (EVs) and circulating biofluids has extended this view towards intercellular and potentially systemic roles in cancer. However, EV-associated RNA claims often combine evidence obtained at different biological scales, making it difficult to distinguish functional cell-to-cell transfer from circulating detection. Here, we review the HOTAIR literature through a distance-aware lens\u2014a descriptive interpretive aid rather than an established evidence taxonomy\u2014that separates intracellular activity (D0), paracrine or microenvironmental transfer (D1), and systemic circulation (D2). At each scale, we ask whether the receiving cell or tissue has been functionally validated. Within selected D0\u2013D1 contexts, EV-associated HOTAIR has been implicated in local recipient-cell reprogramming, including effects on B cells, macrophages, endothelial cells, and stromal or tumour cells through metabolic, transcriptional, and signalling routes. Several mechanistically distinct pathways recur on checkpoint-associated and immunosuppressive endpoints, particularly PD-L1-linked phenotypes; we describe this as a recurrent checkpoint-associated convergence pattern rather than as a new biological paradigm. Circulating HOTAIR remains a valuable discovery and monitoring signal; however, claims that it functions as a distal messenger should be qualified unless downstream recipient-cell function, cytosolic delivery and causal continuity are demonstrated. Circulation-scale studies can motivate productive paracrine- and intracellular-scale follow-ups, even when distal function is not established. We describe the mismatch between abundant detection and insufficiently demonstrated functional continuity as an evidential trough. This review therefore positions EV-associated HOTAIR as a useful case for matching cancer cell communication claims to the scale and quality of evidence that supports them while preserving the biomarker value of circulating RNA studies.<\/jats:p>","DOI":"10.3389\/fcell.2026.1891799","type":"journal-article","created":{"date-parts":[[2026,8,10]],"date-time":"2026-08-10T11:43:29Z","timestamp":1786362209000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["EV-associated HOTAIR in cancer cell communication: a distance-aware review of functional transfer claims"],"prefix":"10.3389","volume":"14","author":[{"given":"Xitan","family":"Wang","sequence":"first","affiliation":[{"name":"Department of Oncology, Zibo Central Hospital","place":["Zibo, Shandong, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Han","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Oncology, Zibo Central Hospital","place":["Zibo, Shandong, China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,8,10]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"e1009951","DOI":"10.1371\/journal.pgen.1009951","article-title":"MicroRNAs are minor constituents of extracellular vesicles that are rarely delivered to target cells","volume":"17","author":"Albanese","year":"2021","journal-title":"PLoS Genet."},{"key":"B2","doi-asserted-by":"publisher","first-page":"341","DOI":"10.1038\/nbt.1807","article-title":"Delivery of siRNA to the mouse brain by systemic injection of targeted exosomes","volume":"29","author":"Alvarez-Erviti","year":"2011","journal-title":"Nat. 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