Figure 2

Immunohistochemistry showing expression of smooth muscle actin (a adenoid cystic carcinoma (ACC)-diffusely positive, d polymorphous low-grade adenocarcinoma (PLGA)-negative) calponin (b ACC-diffusely positive, e PLGA-negative), smooth muscle myosin heavy chain (c ACC-positive, f PLGA-negative), metallothionein (g ACC-diffusely positive, j PLGA-negative), maspin (h ACC-positive, k PLGA-positive), and p63 (i ACC-positive, l PLGA-positive). Smooth muscle actin, calponin, and smooth muscle myosin heavy chain show cytoplasmic staining, metallothionein and maspin show nuclear and cytoplasmic staining, and p63 shows nuclear staining reaction only.