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COX-2 expression according to immunohistochemical staining of LSCC samples. a, b A laryngeal squamous cell carcinoma (LSCC) case demonstrating a high expression level of COX-2 (arrow) detected in the cytoplasm of carcinoma cells (magnification: a ×100; b ×400); c, d Negative expression level of COX-2 detected in LSCC (magnification: c ×100; d ×400); e, f Negative expression level of COX-2 detected in adjacent normal tissue of LSCC (magnification: e ×100; f ×400)
