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From the Department of Thoracic Surgery and Department V of
Oncology,*
Kitano Hospital, Tazuke Kofukai Medical Research
Institute, Osaka, and the Second Department of Internal
Medicine,
Ehime University School of Medicine,
Ehime, Japan
MRP-1/CD9, KAI1/CD82, and ME491/CD63, have been reported to be associated with the metastatic potential of solid tumors. The aim of this study was to determine whether their expression in tumor tissues is a useful indicator for prognosis in breast cancer patients. We studied 109 breast cancer patients who underwent surgery. Quantitative reverse transcription-polymerase chain reaction analysis was performed to evaluate the expression of these genes. The results were confirmed with immunohistochemistry. All of the carcinomas were ME491/CD63 positive. Thirty-six tumors were MRP-1/CD9 negative. The disease-free survival rate and the 5-year survival rate of patients with MRP-1/CD9-negative tumors were both significantly lower than that in patients with MRP-1/CD9-positive tumors (P = 0.0005 and P = 0.0380, respectively). Sixty-five tumors were KAI1/CD82 negative. The disease-free survival rate of patients with KAI1/CD82-negative tumors was significantly lower than that of patients with KAI1/CD82-positive tumors (P = 0.0065). Cox regression analysis demonstrated that MRP-1/CD9 status (P = 0.0016) and KAI1/CD82 status (P = 0.0234) were useful indicators for the disease-free survival of breast cancer patients. The disease-free survival rate and 5-year survival rate of patients with either MRP-1/CD9-negative or KAI1/CD82-negative tumors were both significantly lower than patients who were positive for both genes (P = 0.0003 and P = 0.0292, respectively). The expression of MRP-1/CD9 and KAI1/CD82 genes are useful indicators of a poor prognosis in breast cancer patients.
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