Relationship between HER2 and Ki-67 expression in colorectal cancer and prognostic factors analysis / 重庆医学

ABSTRACT

Objective To investigate the role of HER2 and Ki-67 in colorectal cancer pathogenesis and their influence on the prognosis in the patients with colorectal cancer.Methods The expressions of HER2 and Ki-67 proteins in colorectal cancer tissues from 71 cases of colorectal cancer and 30 cases of para-cancerous normal tissues were detected by usingthe immunohistochemistry.The expressions of HER2,Ki-67 and their clinicopafhological parameters and prognostic significance were also analyzed.Results The positive expression rate of HER2 in colorectal cancer tissue (32.4％) was higher than that in para-cancerous normal tissues (10.0％);the positive expression rate ofKi-67 in colorectal cancer tissue (85.9％) was significantly higher than that in para-cancerous normal tissues (6.7 ％),the difference was statistically significant (P＜0.05).The expression of HER2 in colorectal cancer tissues was correlated with tumor differentiation degree,lymph node metastasis,number of lymph node metastasis and TNM staging (P＜0.05).The expression of Ki-67 in colorectal cancer tissues was correlated with infiltration depth,lymph node metastasis,number of lymph node metastasis and TNM staging (P＜0.05).HER2 in colorectal cancer tissues was positively correlated with Ki-67 (r=0.515,P=0.001).The 5-year disease-free survival rates in the HER2 positive group and the HER2 negative group were 48.4％ and 80.8％,the difference was statistically significant (P＜0.05).The 5-year diseasefree survival rates in the Ki-67 high expression group and the Ki-67 low expression group were 56.5 ％ and 85.5％,the difference was statistically significant (P＜0.05).The 5-year survival rate in the HER2 positive group and the HER2 negative group were 60.9 ％ and 85.5 ％,the difference was statistically significant (P＜0.05).The 5-year survival rate in the Ki-67 high expression group and the Ki-67 low expression group were 63.9％ and 85.5 ％,the difference was statistically significant (P＜0.05).The single factor analysis showed that tumor differentiation degree,infiltration depth,lymph node metastasis,number of lymph node metastasis,TNM staging,the expressions of HER2 and Ki-67 were related with prognosis in the patients with colorectal cancer (P＜0.05).The Cox multivariate analysis results showed that tumor infiltration depth and TMN staging were the independent factors affecting prognosis in the patients with colorectal cancer.Conclusion The expressions of HER2 and Ki-67 are associated with the development of colorectal cancer.The 5-year disease-free survival rate and the 5-year survival rate in the patients with HER2 and Ki-67 positive become significantly decreased.