Objective: To compare the expression pattern of CD44 and cyclin D1 immunostaining in fine needle aspiration specimens of papillary carcinoma of the thyroid and nonpapillary lesions.
Study Design: The study was performed on 80 fine needle aspiration cytologic smears of thyroid lesion retrospectively using monoclonal antibodies and on histologic material from a proportion of cases.
Results: Most papillary carcinomas expressed intense cell membrane or diffuse cytoplasmic staining for CD44 (97.