KCNJ14 encodes an inward rectifier potassium channel that allows preferential potassium influx into cells, with voltage dependence regulated by extracellular potassium concentration 1. In cardiac tissue, KCNJ14 (Kir2.4) is expressed at low levels in healthy ventricles and contributes to the inward rectifier current (IK1) involved in cardiac repolarization 2. In the inner ear, KCNJ14 participates in electrogenic transport essential for maintaining the ionic composition of endolymph necessary for hearing and balance 3. Additionally, KCNJ14 has predicted roles in eye development 4. Clinically, KCNJ14 is dysregulated across multiple cancers including colorectal, lung, gastric, and head/neck tumors 1. In colorectal cancer specifically, KCNJ14 knockdown inhibits cell proliferation and migration through the mTOR signaling pathway 5. High KCNJ14 expression correlates with advanced disease stage, lymphatic/venous invasion, and lymph node metastasis, while creating an immunosuppressive tumor microenvironment characterized by reduced CD4+ and CD8+ T cell infiltration 6. KCNJ14 associates with cancer stemness, immunotherapy targets including PD-L1, and genomic instability markers 1. Although not an independent prognostic factor for survival, KCNJ14 may serve as a biomarker for tumor progression and immunosuppression, representing a potential therapeutic target 6.