KRT7 and calcifying epithelial odontogenic tumor: The odontogenic epithelial cells in AR-COF cases and in two previously reported as NCLC-CEOT cases [15] have been shown to be positive for CK (AE1/AE3) [21], CK5/6 [21], CK19 [21], and CK10/13 [15], but are negative for CK7 [15] and CK8/18 [15].