{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,19]],"date-time":"2026-08-19T13:24:17Z","timestamp":1787145857972,"version":"build-2736575974"},"reference-count":145,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,8,19]],"date-time":"2026-08-19T00:00:00Z","timestamp":1787097600000},"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. Oncol."],"abstract":"<jats:p>Breast cancer is a highly heterogeneous disease characterized by extensive genomic and chromosomal instability (CIN), a hallmark that drives tumor evolution, intratumoral heterogeneity, therapeutic resistance, and poor clinical outcomes. Increasing evidence indicates that non-coding RNAs (ncRNAs) are important regulators of genome maintenance and chromosome stability. However, their specific contributions to CIN and the strength of the available evidence remain incompletely understood. This review examines the role of the major ncRNA classes, including circular RNAs, microRNAs, PIWI-interacting RNAs, small nucleolar RNAs, and long non-coding RNAs, in the regulation of CIN-related processes in breast cancer. We discuss the molecular mechanisms by which these ncRNAs regulate key pathways involved in CIN, while critically evaluating the strength of the experimental evidence supporting their functional roles. We also examine their associations with distinct breast cancer molecular subtypes and assess their potential as biomarkers and therapeutic targets, highlighting current limitations and knowledge gaps that hinder clinical translation. Collectively, the available evidence supports an emerging role for ncRNAs as regulators of CIN while underscoring the need for further mechanistic and subtype-specific studies to validate their clinical utility.<\/jats:p>","DOI":"10.3389\/fonc.2026.1894119","type":"journal-article","created":{"date-parts":[[2026,8,19]],"date-time":"2026-08-19T12:31:46Z","timestamp":1787142706000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Non-coding RNAs as regulators of chromosomal instability in breast cancer"],"prefix":"10.3389","volume":"16","author":[{"given":"Deisy","family":"Pinilla-Pe\u00f1a","sequence":"first","affiliation":[{"name":"School of Biological Sciences, Universidad Pedag\u00f3gica y Tecnol\u00f3gica de Colombia","place":["Tunja, Colombia"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anlly","family":"Ni\u00f1o-Salgado","sequence":"additional","affiliation":[{"name":"School of Biological 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