POU3F3 (POU class 3 homeobox 3) is a transcription factor that plays critical roles in both normal development and cancer progression. In neurodevelopment, POU3F3 functions as a transcription factor involved in neuronal development, though its specific mechanisms in this context require further investigation 1. Pathogenic variants in POU3F3 cause Snijders Blok-Fisher syndrome, characterized by developmental delay, behavioral problems, hypotonia, and dysmorphic features, with variants affecting the DNA-binding domain stability 1. In cancer biology, POU3F3 demonstrates oncogenic properties across multiple malignancies. It promotes hepatocellular carcinoma progression by transcriptionally activating retinoic acid metabolism genes, conferring resistance to ferroptosis-inducing treatments like sorafenib 2. In non-small cell lung cancer, ERK1-mediated phosphorylation facilitates POU3F3 nuclear translocation, where it transcriptionally activates ATP5PF to enhance ATP production and cellular proliferation 3. Importantly, a long intergenic non-coding RNA (linc-POU3F3) negatively regulates POU3F3 expression and paradoxically functions as an oncogene in multiple cancers including glioma, hepatocellular carcinoma, colorectal cancer, renal cell carcinoma, and nasopharyngeal carcinoma 45678. This dual regulatory mechanism highlights POU3F3's complex role in cellular homeostasis and disease pathogenesis.