GPRIN1 (G protein regulated inducer of neurite outgrowth 1) functions as a multifaceted regulatory protein with significant roles in cancer progression and neuronal signaling. In cancer contexts, GPRIN1 acts as an oncogene that promotes tumor cell proliferation and survival through dual regulatory mechanisms 1. It functions as a transcriptional co-activator by scaffolding and stabilizing E2F1 to drive CDK1 expression, while simultaneously promoting CDK1 activation at the post-translational level by directing the kinase away from its inhibitor MYT1 toward its activator Cdc25C 1. This dual control of CDK1 triggers PI3K-Akt signaling cascades that couple cell cycle progression with mitochondrial homeostasis 1. GPRIN1 overexpression is associated with poor prognosis in multiple cancers, including lung cancer, breast cancer, and gallbladder cancer 231. In lung cancer, GPRIN1 facilitates proliferation and migration possibly through epithelial-mesenchymal transition pathways 2. Additionally, GPRIN1 interacts with 5-HT6 receptors independently of agonists, enhancing receptor activity in neuronal contexts 4. GPRIN1 also contributes to drug resistance mechanisms, as demonstrated in Taxol-resistant non-small cell lung cancer through the circ_0002360/miR-585-3p/GPRIN1 axis 5.