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INTRODUCTION: Oral squamous cell carcinoma (OSCC) is the commonest malignancy in oral cavity. Dysregulated inflammatory processes could impose a cancer risk. Cytokines are inflammatory mediators that can induce cell proliferation. Interleukin-10 is a pleiotropic cytokine which has a dual role in cancer pathogenesis. It contributes to tumor growth and in other cases to tumor rejection. OBJECTIVES: To evaluate and correlate the expression of IL-10 in different histopathological grades of OSCC, as well as to assess its serum and salivary levels. MATERIALS AND METHODS: Immunohistochemical (IHC) study using the IL-10 antibody was done on 20 surgical specimens and 5 normal mucosal tissues taken from OSCC patients and healthy individuals, respectively. Serum and salivary levels of IL-10 were also measured with a human IL-10 ELISA Kit in both patients and controls. RESULTS: OSCC biopsies showed immunoreactivity to IL-10, while normal tissues were immunonegative. The IHC staining intensity was directly proportional to the grading of OSCC. Conversely, it showed no significant correlation to the disease stage. The difference in the serum and salivary IL-10 levels in patients and controls was not statistically significant. However, there was a significant correlation between IL-10 tissue expression and its serum and salivary levels in OSCC patients. CONCLUSIONS: IL-10 is expressed in OSCC biopsies. Additionally, the levels of IL-10 in tissue, serum and saliva were correlated to each other. This could reflect the same way of regulation of IL-10 in different parts of the body.

Rhabdomyoblastic differentiation in a malignant peripheral nerve sheath tumor (MPNST) is termed malignant triton tumor (MTT), a rare neoplasm that poses a diagnostic dilemma in the differential diagnosis of neck masses and portends poor prognosis. We report a sporadic case of MTT of the neck in a 23-year-old female. We present the pathological findings. Immunohistochemistry confirmed the neurogenic origin with S-100 expression and the rhabdomyoblastic differentiation with desmin and vimentin positivity. Radical surgical excision was done. After 4 years there were no signs of recurrence or distant metastasis. The clinical, microscopic, and long-term follow-up of this case are consistent with those of a low-grade malignancy.

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Background: Adenomatoid odontogenic tumor (AOT) is an uncommon benign epithelial odontogenic tumor. Expert morphological diagnosis is required to establish differential diagnosis, in particular from ameloblastoma, thus preventing extensive surgery. Objective: To clarify the histopathological features of AOT, as well as to assess the immunohistochemical expression of survivin in AOT. Material and methods: Ten specimens of AOT, and one specimen of tooth germ as a control were collected from the archival files of Oral Pathology Department, Faculty of Dentistry, Alexandria University, Egypt. The expression of survivin was assessed by immunohistochemical methods. Results: Our results revealed that all the cases of AOT, as well as the tooth germ were immunoreactive to survivin. Conclusion: The expression of survivin in AOT, suggested that the family protein survivin contributes to the biological properties of AOT, such as cell survival, proliferation, differentiation and tissue structuring, as well as cellular regulation during tooth development.