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[Expression of six gene proteins in laryngeal carcinomas and their significance].

OBJECTIVE
To investigate the expression of p15, p16, Rb, p27,p53 and PCNA gene proteins in different clinical stage, different position and different histological types of laryngeal carcinomas and their significance.


METHOD
p15, p16, Rb, p27, p53 and PCNA gene proteins were examined with immunohistochemical SP method in the paraffin-embedded specimens of 65 cases with LSCC and 30 cases of normal or proliferative mucosas of larynx as a contrast. The result was analyzed by chi-square test.


RESULT
The expression of the six gene proteins in LSCC and in laryngeal with normal or proliferative mucosas was different, the difference was significant (P < 0.01); the expression of p15 and p27 was significantly related with the position/clinical stage/histological types of LSCC (P < 0.01); the expression of p16 was significantly negative but the PCNA was positive correlated with th histological types of LSCC (P < 0.01). Two of them did not correlate with the position or clinical stage of LSCC (P > 0.05). There was trend of the decreasing Rb expression or increasing p53 expression with increasing clinical stages of LSCC, and the expression of p53 was also positive correlated with the histological types of LSCC.


CONCLUSION
p15 and p27 play an important role in the development and progression of LSCC, and can be used as markers for assessment the treatment and prognosis of LSCC. The expression of p16 and PCNA can reflect the proliferation activity in the tumor cells, and is correlated with the development of tumor, but it does not correlate with the progression of tumor. The expression of Rb and p53 were more correlated with the progression of tumor.