Abstract
Calcifying odontogenic cysts (COCs) represent a group of rare odontogenic lesions with a diversity of clinicopathological and behavioral features. According to the WHO classification of head and neck tumors in 2005, COC has been divided into calcifying cystic odontogenic tumor (CCOT), dentinogenic ghost cell tumor (DGCT) and ghost cell odontogenic carcinoma (GCOC). With few reports available on its immunohistochemical profile, this study investigated the histopathological features and the expression of nuclear factor kappaB (NF-kappaB), Ki-67 and matrix metalloproteinase-9 (MMP-9) in CCOT, DGCT and GCOC. According to the WHO classification of head and neck tumors in 2005, 26 cases of the so-called COC were diagnosed as CCOT (n=14), DGCT (n=7) and GCOC (n=5), respectively. The specimens of 26 COCs and 10 classic ameloblastomas (as control group) were examined by immunohistochemistry using anti-NF-kappaB p65, anti-Ki-67 and anti-MMP-9 antibodies and by in situ hybridization(ISH)using anti-MMP-9 mRNA probes. Immunohistochemical reactivity for NF-kappaB was mainly detected in the cytoplasm of tumor cells, and nuclear reactivity was only seen in few tumor cells in COC and classic ameloblastomas. Rate of nuclear staining was less tha...Continue Reading
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