Clinicopathological Study of CK19 Expression in Head and Neck Squamous Cell Carcinoma and Its Association with Tumor Grading: A Cross-Sectional Study.
Introduction: Head and neck squamous cell carcinoma (HNSCC) is a histologically heterogeneous group of tumors with diverse biological behavior. Cytokeratin 19 (CK19), part of the epithelial cytoskeletal network, may indicate tumor differentiation and progression. This cross-sectional study evaluated CK19 immunohistoch...