Objective: To investigate the ING1 gene mutation status in human laryngeal squamous cell carcinoma(LSCC), and the association of p33(ING1b) protein expression with p53 protein expression.
Method: DNA of LSCC tissue was extracted, and nucleotide of the second exon was amplified and sequenced to determine the chromosome status. The p23(ING1b) and p53 protein expression were detected by immunohistochemistry and the association between them were analyzed.
Result: No mutation was detected in ING1 gene, but a single polymorphism from GGG to AGG at codon 170 of ING1 gene was found in 2 of the 25 LSCC tissues. The immunohistochemical analysis showed that 4 had positive p33(ING1b) expression. No association was found between p33(ING1b) expression and LSCC clinical features, or between p53 and clinical features. However, significant difference was found between p33(ING1b) and p53 expression. p33(ING1b) tended to be negative in p53 expression positive tissue.
Conclusion: ING1 gene mutation appears rare in LSCC. In normal physical condition, p33(ING1b) may play a synergistic effect with p53 protein.
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