B-RAF (Phospho-Ser602) ELISA Kit

Inverted (Schneiderian) sinonasal papilloma (ISP) is a neoplasm derived from mucosa of the sinonasal tract characterized by local aggressive growth, a tendency to recur and an association with sinonasal carcinoma. The etiology of ISP remains unclear. Recently, identical mutations in exons 19 and 20 of the oncogeneEGFRwere reported in ISP and ISP-associated sinonasal carcinoma. Nevertheless, it remains unclear whether recurring ISPs show identicalEGFRmutations at different time points or whether these mutations are identical throughout the respective ISP sample. We used Sanger sequencing to test 60 formalin-fixed paraffin embedded ISP samples from 40 patients regarding mutations in exons 19 and 20 ofEGFR-together with exon 15 ofBRAF. Overall, 32 samples of 22 patients showed a mutation inEGFRexon 20, whereas 28 samples of 18 patients showed none. No mutation inEGFRexon 19 was found in any sample. Four samples of four patients showed aBRAFexon 15 mutation. Interestingly, samples of four patients exhibited genetic heterogeneity, enabling us to report this in ISP for the first time.

Purpose Gynecological melanomas (GMs) are rare tumors with a poor prognosis. Here, we performed exome sequencing to generate the mutational landscape of GMs. Methods Next-generation sequencing was carried out on mucosal melanoma samples (n= 35) obtained from gynecological sites. The alternative telomere lengthening (ALT) phenotype was verified by fluorescencein situhybridization and the C-circle assay. Immunohistochemistry was performed to detect ATRX protein. Copy number variations inTERTwere detected by droplet digital polymerase chain reaction. Results In the 58 formalin-fixed paraffin-embedded samples, we identified 33 (56.9%) ALT-positive cases, with 23 showing loss of ATRX protein.TERTpromoter mutation was not detected in GMs (n= 40), but copy number variations in theTERTregion were observed in 20% (7/35) of the samples.TERTamplification was mutually exclusive with ALT (P< 0.05). Kaplan-Meier revealed that ALT relative toTERTamplification was associated with longer overall survival in GM patients without metastasis. Conclusion These findings indicate that telomere maintenance mechanisms play a critical role in the tumorigenesis of GMs and may aid in the prediction of clinical prognosis and the development of targeted therapy for the treatment of GM.