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- W4313909915 abstract "Abstract Background There are still some controversies about the results of anti‐BRAF V600E‐specific antibody immunohistochemistry in ameloblastomas. This study aimed to examine the accuracy of V600E‐specific antibody immunohistochemistry in detection of BRAF V600E mutation in ameloblastoma tissue sections of different ages. Methods The BRAF V600E status of 64 ameloblastoma specimens was assessed using both Sanger sequencing and V600E‐specific antibody immunohistochemistry, and the sensitivity, specificity, positive predictive value, and negative predictive value were calculated. The difference in V600E‐specific antibody immunohistochemistry staining intensity among the three groups of ameloblastoma tissue blocks of different ages was evaluated by chi‐square test. The consistency between V600E‐specific antibody immunohistochemistry and DNA sequencing results and the V600E‐specific antibody immunohistochemistry staining intensity of 15 paired newly‐cut and 3‐month storage sections of the same 15 ameloblastomas were also compared. Results For detection of BRAF V600E mutation, the V600E‐specific antibody immunohistochemistry had high sensitivity (98.21% 55/56), specificity (87.5% 7/8), positive predictive value (98.21% 55/56), and negative predictive value (87.5% 7/8). Heterogeneity of the staining intensity was observed in the same tissue section, but all or none expression pattern was noticed in the solid tumor nests. The storage time of paraffin tissue blocks ranging from 2 to 14 years did not affect the V600E‐specific antibody‐positive staining intensity. However, the three‐month storage sections showed a significant diminishment of V600E‐specific antibody‐positive staining signals. Conclusions The BRAF V600E‐specific antibody immunohistochemistry is suitable for routine detection of BRAF V600E mutation in ameloblastomas. The all or none expression pattern suggests the BRAF V600E mutation may be an early event in the pathogenesis of ameloblastoma." @default.
- W4313909915 created "2023-01-10" @default.
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- W4313909915 date "2023-01-10" @default.
- W4313909915 modified "2023-10-15" @default.
- W4313909915 title "Factors affecting the accuracy of <scp>anti‐BRAF V600E</scp> immunohistochemistry results in ameloblastomas" @default.
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- W4313909915 doi "https://doi.org/10.1111/jop.13399" @default.
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