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Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: OBJECTIVE, METHODS, RESULTS. Meshes: Aged, Biomarkers, Tumor, Female, High-Temperature Requirement A Serine Peptidase 1, Humans, Immunohistochemistry, In Vitro Techniques, Male, Meningeal Neoplasms, Meningioma, Middle Aged, Neoplasm Recurrence, Local, Prognosis, Serine Endopeptidases.
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Does decrease in serine protease HtrA1 expression correlate with grade and recurrence in meningiomas? Context: HtrA1 is a serine protease which was shown to be down-regulated in a variety of human cancers. It is considered to be a tumor suppressor and suggested as a prognostic marker and a therapeutic candidate. In order to investigate any possible implication of HtrA1 in meningioma we studied 100 cases. We used immunohistochemistry to determine HtrA1 expression in tumor tissue. Expression levels were evaluated with respect to tumor grade and recurrence. Our data revealed a strong association between decrease in HtrA1 expression and increase in meningioma grade (p=0.005). Most importantly, patients with higher HtrA1 expression had a lower rate of recurrence (p<0.001).
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According to our results HtrA1 appeared as an immunohistochemical marker to predict behaviour of the meningioma, mainly the recurrence. Although the exact mechanisms of HtrA1 are still largely unknown, we think that further in vivo and in vitro studies explaining the molecular targets of HtrA1 would have a great importance with regard to its role as a therapeutic agent for meningioma. Final Decision: yes