Fig. 1.

Immunohistochemistry. Immunohistochemistry (IHC) of CD47 expression in SGC tissues. Upper row shows 200x magnification images, lower row shows 400x magnification images. Representative images show CD47 expression with negative score in tumor cells (black arrow), and score 2 positivity in tumor-infiltrating immune cells (red arrow) in adenoid cystic carcinoma; CD47 expression with score 3 positivity in tumor cells (black arrow), score 3 positivity in tumor-infiltrating immune cells (red arrow) and negativity in stroma (black arrowhead) in acinic cell carcinoma; CD47 expression with score 2 positivity in tumor cells (black arrow), score 3 positivity in tumor-infiltrating immune cells (red arrow) and positivity in ductal epithelium (black arrowhead) in salivary duct carcinoma; CD47 expression with score 2 positivity in tumor cells (black arrow), score 3 positivity in tumor-infiltrating immune cells (red arrow) and negativity in adipose tissue (black arrowhead) in adenocarcinoma NOS; CD47 expression in tumor cells (black arrow) and tumor-infiltrating immune cells (red arrow) in mucoepidermoid carcinoma