CPNE8 encodes a calcium-dependent phospholipid-binding protein involved in calcium-mediated intracellular signaling. The protein localizes to plasma membranes and extracellular exosomes and participates in cellular responses to calcium influx through its phospholipid-binding capacity. In neurodegeneration, CPNE8 emerged as a quantitative trait modifier of prion disease incubation time in mice, with mRNA upregulation observed at terminal disease stages 1, and increased plasma peptide abundance was detected in Alzheimer's disease patients compared to controls 2. In gastric cancer, elevated CPNE8 expression correlates with advanced TNM stage, higher tumor grade, and metastatic potential, and functions as an independent poor prognostic marker by promoting cell proliferation and invasion through focal adhesion pathway regulation 3 4. Recent evidence indicates CPNE8 represents a causal candidate for aortic stiffness and blood pressure regulation in vascular smooth muscle 5. In acute myeloid leukemia, CPNE8 ranks among key epigenetic features contributing to prognostic stratification, with differential methylation patterns predicting chemotherapy and epigenetic inhibitor (LAQ824, MS-275) sensitivity 6 7. These findings establish CPNE8 as a pleiotropic regulator relevant to vascular, hematologic, and gastrointestinal malignancies.