Heartbreakers and healers: RNA rebels in cardio-oncology.

Cancer therapies save lives but often "break hearts" by damaging the cardiovascular system. As survival improves, therapy-induced cardiotoxicity has become a defining challenge of modern oncology. Recent discoveries reveal that long non-coding RNAs (lncRNAs), once dismissed as genomic noise, are the "RNA rebels" orchestrating cellular responses to cancer treatments. These molecules act as both heartbreakers and healers, amplifying or counteracting oxidative stress, mitochondrial dysfunction, apoptosis, and vascular injury. In anthracycline, radiation, and VEGF-targeted therapies, lncRNAs govern key processes that dictate whether cells succumb to damage or mount protective repair responses. Pro-injury lncRNAs exacerbate senescence and inflammation, while protective ones preserve mitochondrial homeostasis and limit cell death. Beyond mechanistic insight, these molecules hold clinical promise as biomarkers and therapeutic targets, guiding RNA-based strategies to predict, prevent, and treat cardiotoxicity. Understanding how they blur the line between protection and harm may redefine how we safeguard the heart in the era of precision cardio oncology.