RASSF8 (Ras association domain family member 8) functions as a tumor suppressor protein that regulates cell growth, migration, and apoptosis through multiple signaling pathways. The protein localizes to both the nucleus and cell membrane at adherens junctions, where it co-localizes with β-catenin and binds to E-cadherin to maintain epithelial cell-cell adhesions 1. RASSF8 contains an N-terminal Ras association domain and lacks the SARAH domain characteristic of classical RASSF family members 1. Mechanistically, RASSF8 suppresses tumor progression by inhibiting Wnt and NF-κB signaling pathways - its depletion leads to β-catenin and p65 nuclear translocation with increased transcriptional activity 1. RASSF8 also activates the p53-p21 pathway to induce apoptosis 2. The gene demonstrates significant clinical relevance across multiple cancers. RASSF8 expression is frequently downregulated in various malignancies through promoter hypermethylation 2 or transcriptional repression by E4BP4 via histone methyltransferases G9a and SUV39H1 3. Higher RASSF8 expression correlates with advanced tumor stages and metastasis in thyroid carcinoma 4, while loss of expression promotes cancer cell invasion, migration, and anchorage-independent growth 1. These findings establish RASSF8 as an important tumor suppressor with therapeutic potential.