Abstract
Notch pathway molecules crosstalk with Wnt/β-catenin signaling cascade in stem cells and tumors. However, the correlation between the expression pattern of Notch intracellular domain NICD, Hes-1 and c-Myc has not been studied in oral squamous cell carcinoma. The aim of this study is to investigate the correlation and prognostic significance of NICD, Hes-1 and c-Myc in oral cancer. Immunohistochemistry was used to study the expression pattern of NICD, Hes-1 and c-Myc in oral preneoplastic and neoplastic tissues. In addition, double immunofluorescence was used to examine the co-localization of NICD, Hes-1 and c-Myc in H314 cells. The expression pattern of NICD and Hes-1 was gradually increased from normal to dysplasia to carcinoma. Interestingly, statistically significant correlation was not observed between NICD, Hes-1 and c-Myc in oral squamous cell carcinoma. Furthermore, NICD+/c-Myc+ and Hes-1+/c-Myc+ double positive cases showed worst survival when compared with other cases in oral cancer. Notch signaling molecules, NICD and Hes-1, are found to be involved in the progression of oral squamous cell carcinoma. Interestingly, NICD, Hes-1 and c-Myc may have independent roles in oral cancer. On the other hand, we have demonstrated that NICD+/c-Myc+ and Hes-1+/c-Myc+ double positivity might be used as independent prognostic indicator of oral carcinoma.
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