多药耐药基因产物在大肠癌组织中的表达及临床意义

P27 expression in colorectal cancer: Significance and correlation with expression of Ki-67, P170, MLH1, MSH2, and MSH6

AIM: To investigate the relationship between P27 expression and tumor invasion, metastasis, multidrug resistance and prognosis of colorectal cancer (CRC), and to explore the possible mechanisms involved.

METHODS: Two hundred and sixty-three sporadic CRC patients who underwent surgery in the Department of Colorectal Surgery, Beijing Cancer Hospital from March 2008 to March 2012 were included in this study. All patients were diagnosed by histological examination and did not undergo chemoradiotherapy before surgery. Immunohistochemistry was used to detect P27, Ki-67, P170, MLH1, MSH2 and MSH6 protein expression in samples from these patients. The association between expression and clinical data was analysed retrospectively.

RESULTS: The positive rates of P27, Ki-67, P170, MLH1, MSH2 and MSH6 expression in CRC were 71.1%, 81.4%, 82.5%, 86.7%, 87.8% and 71.1%, respectively. Deficient expression of P27 was closely associated with tumour size, location, differentiation, invasion depth, vascular invasion and lymph node metastasis, but had no association with patients' gender, age, or tumor macroscopic morphology. P27 expression was negatively correlated with Ki-67 and P170 expression (r = -0.315, -0.163, P = 0.00, 0.01), but positively with MLH1, MSH2 and MSH6 expression (r = 0.129, 0.136, 0.159, P = 0.03, 0.03, 0.01).

CONCLUSION: P27 expression is closely associated with the development, invasion and metastasis of CRC. P27 protein expression can be regarded as an important parameter for evaluation of colorectal cancer progression and for selection of chemotherapy drugs and prevention of multidrug resistance.