TACSTD2 and neoplasm: Moreover, Trop-2 expression showed no correlation with tumor localization (parotid gland vs. submandibular gland; p = 0.32), sex (p = 0.744), presence of nodal metastases (p = 0.721), perineural invasion (p = 0.707), vascular invasion (p = 0.576), lymphatic invasion (p = 1.000).