Background: This study evaluated the expression of p300 in colorectal cancer, its relationship with clinicopathological characteristics, and its potential prognostic significance.
Methods: The expression of p300 was measured using immunohistochemistry in tumors and surrounding normal mucosa from 199 patients with primary colorectal cancer. The patients were followed for a median period of 83 months.
Results: Nuclear p300 expression was significantly associated with histology (P = 0.031) and lymph node involvement (P = 0.019). When the low and high p300 groups were subdivided according to tumor location, the disease-free survival rate differed only for the patients with colon cancer (P = 0.008). In addition, the disease-free survival significantly differed with p300 expression for stage II disease (P = 0.038), but not for stage III disease. Multivariate analysis revealed that lymph node involvement (P = 0.014) and p300 expression (P = 0.032) were independent predictors of overall survival in adenocarcinomas.
Conclusion: The overexpression of p300 may be an independent favorable prognostic factor for disease-free survival in patients with colorectal cancer.
Keywords: colorectal cancer; immunohistochemistry; p300.
© 2013 Wiley Periodicals, Inc.