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HMGI-C belongs to the high-mobility-group-protein (HMG) family of architectural transcription factors and considerable interest has recently been shown in its expression in neoplastic tissues and apparent involvement in tumorigenesis. We could previously demonstrate an expression of HMGI-C mRNA in the peripheral blood of breast cancer patients for the first time. In this prospective study, we evaluated the independent prognostic power of HMGI-C mRNA expression in the peripheral blood of an unselected cohort of 69 patients with metastatic breast cancer using a hemi-nested reverse transcriptase polymerase chain reaction (RT-PCR) followed by sequence analysis of the resulting PCR products. Multivariate analysis was performed using the Cox regression model. HMGI-C mRNA was detected in peripheral blood from 21 out of 69 (30%) patients with metastatic breast cancer. Median survival was 15.9 months in patients expressing HMGI-C, while in the group of patients without HMGI-C expression the median survival had not been reached yet after a median follow-up of 24.7 months and 85.4% were still alive in this group. Disease-specific survival was significantly worse for patients positive for HMGI-C in comparison to those not expressing HMGI-C (P=0.0001). In a multivariate regression analysis, HMGI-C remained an independent prognostic factor for overall survival (P=0.001) besides oestrogen receptor status (P=0.024) and presence of metastases in liver and lungs (P=0.029). HMGI-C expression in the peripheral blood of patients with metastatic breast cancer is a powerful independent indicator for poor overall survival and this is the first study to demonstrate its prognostic relevance in univariate and multivariate analysis.

british journal of cancer

Expression of high-mobility-group-protein HMGI-C mRNA in the peripheral blood is an independent poor prognostic indicator for survival in metastatic breast cancer