Survivin expression in colorectal adenocarcinoma using tissue microarray.

BACKGROUND The additional prognostic information closely related to tumor cell biology is essential for the identification of patients with poor prognosis. Survivin, an identified inhibitor of apoptosis, is unique for its expression in human malignancies but not in normal adult cells. This study examined the expression, and potential prognostic value of survivin in colorectal adenocarcinoma (CRC) on tissue microarray (TMA) sections. Analysis of large numbers of tissue samples, improved tissue salvage, cost reduction, ease of interpretation, and significant time saving were realized by using the arrays. MATERIAL AND METHODS Two-hundred and eighty cases of colorectal adenocarcinoma were arrayed. Immunohistochemical stains of TMA sections were performed for survivin, bcl-2, and p53. Cases were followed up for 5 years. RESULTS Survivin was detected in 147 of 230 cases (63.9%). No expression of survivin was observed in normal tissues. There was no correlation between survivin immunoreactivity and age, sex, tumor site, tumor size, histopathologic subtype, tumor grade and clinical stage (p >0.05). Prevalence of survivin expression was significantly higher in bcl-2 positive than in bcl-2 negative cases (88.1% versus 42.1%, p <0.0001), but was not associated with p53 (p=0.09). The 5-year disease free survival (DFS) for patients with survivin positive colorectal adenocarcinoma was significantly lower than that for patients with survivin negative tumors (46% versus 68.7%, p=0.001). CONCLUSION Survivin expression in colorectal adenocarcinoma provides an important prognostic parameter and targeted antagonists of survivin may be beneficial as apoptosis-based therapy for colon cancer.