[BRAF V600E expression in ameloblastomas, ameloblastic carcinomas and cysts].

PURPOSE: To investigate protein and genetic status of BRAF V600E in ameloblastomas, ameloblastic carcinomas and cysts, and to explore if recurrence and malignant transformation of ameloblastomas depends on BRAF status. METHODS: Twenty cysts, 25 primary ameloblastomas, 25 recurrent ameloblastomas and 8 ameloblastic carcinomas were analysed by immunohistochemistry, and 2 cysts, 5 primary ameloblatomas, 5 recurrent ameloblastomas, 3 atypical ameloblastomas and 6 ameloblastic carcinomas were analysed by quantitative real-time PCR(qPCR). SPSS 26.0 software package was used for data analysis. RESULTS: There was no correlation between BRAF V600E expression and recurrence. Cysts and carcinomas had lower frequencies of BRAF V600E mutations than ameloblastomas. There was a concordance between positive staining of BRAF V600E protein and BRAF V600E mutation. CONCLUSIONS: BRAF V600E mutation may be useful in the differential diagnosis of ameloblastomas with cysts and ameloblastic carcinomas. Immunohistochemistry may be a beneficial method to screen for BRAF V600E mutation in ameloblastoma.

[Expression and clinical significance of NEK2 and EMT related molecules in oral squamous cell carcinoma].

PURPOSE: To investigate the expression and significance of NEK2 and EMT-related molecules in oral squamous cell carcinoma (OSCC). METHODS: The expression levels of NEK2 and EMT-related molecules (E-Cadherin, N-Cadherin, Vimentin) in 60 cases of primary OSCC tissues and normal oral mucosa tissues were detected by immunohistochemistry(IHC). NEK2 mRNA expression in 25 OSCC tissues and 10 normal oral mucosa tissues was detected by qRT-PCR. Statistical analysis was performed using SPSS 26.0 software package. RESULTS: The expression of NEK2, N-Cadherin, and Vimentin increased in OSCC tissues, while the expression of E-Cadherin decreased(P＜0.05). The worse the differentiation, the higher the expression of NEK2 and the lower the expression of E-Cadherin(P＜0.05). CONCLUSIONS: NEK2 can be used as a prognostic marker for OSCC. The up-regulation of NEK2 and the changes in the expression levels of EMT related molecules can promote the occurrence and development of OSCC.

[Atypical solitary fibrous tumor of the buccal mucosa: report of 1 case].

Solitary fibrous tumor is often considered to be a mesenchymal tumor. We reported a case of atypical SFT of the buccal mucosa in a 56-year-old male patient. We found hypercellularity, nuclear atypia, increased number of mitotic figures(more than 4 per 10 high-power fields) microscopically. A long-term follow-up is necessary after complete excision.

[Clinical and pathological analysis of 8 patients with oral candidiasis].

PURPOSE: To investigate the clinical and pathological diagnosis of oral candidiasis and reduce misdiagnosis. METHODS: The medical records of 8 patients with oral candidiasis were reviewed retrospectively, HE and PAS staining of histopathology were applied to study the specimens. RESULTS: It was found that oral candidiasis were identified by pathological diagnosis, but weren't considered clinically. Minor abscesses were all detected in the epithelium of conventional histopathologic sections, the hyphae were shown by PAS staining invading the epithelium. CONCLUSIONS: The results suggest that candidal infections should be considered, if there are hyperplastic or ulcerative lesions which last for long time; when minor abscesses are detected in the epithelium by histopathologic examination, oral candidiasis should be highly suspected, and be confirmed by PAS staining.