CLIP4 (CAP-Gly domain containing linker protein family member 4) is a microtubule-associated protein with established roles in cell migration and tumor biology. The protein localizes to microtubule plus-ends and the cell cortex, where it regulates cytoplasmic microtubule organization [based on GO annotations]. Beyond its canonical cytoskeletal functions, CLIP4 has emerged as a critical player in cancer pathogenesis across multiple malignancies. In hepatocellular carcinoma, CLIP4 expression is upregulated by endoplasmic reticulum stress and promotes cell proliferation, migration, and epithelial-mesenchymal transition (EMT) through the ERS-RELA-miR-222-5p-CLIP4 regulatory network 1. Conversely, CLIP4 exhibits tumor-suppressive functions in gastric cancer, where miR-135b-5p-mediated downregulation of CLIP4 promotes malignancy by activating JAK2/STAT3 signaling 2. In breast cancer, CLIP4 downregulation correlates with poor prognosis and triple-negative status 3. CLIP4 holds significant clinical utility as a biomarker. Hypermethylated CLIP4 is a component of diagnostic panels for colorectal cancer (sensitivity 95%, specificity 81.7% when combined with CK20) 4 and gastric cancer risk stratification 5. CLIP4 mutations associate with synchronous metastasis in small renal cell carcinomas 6. Additionally, CLIP4 methylation patterns serve as circulating tumor DNA biomarkers for predicting recurrence in gastric cancer 7, establishing CLIP4 as a multi-functional protein with both context-dependent oncogenic and tumor-suppressive roles.