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Clinicopathological Significance of Reduced SPARCL1 Expression in Human Breast Cancer

  • Cao, Fang (Department of Surgery, the Affiliated Kunshan First People's Hospital, Jiangsu University) ;
  • Wang, Kuo (Department of Surgery, the Affiliated Kunshan First People's Hospital, Jiangsu University) ;
  • Zhu, Rong (Department of Surgery, the Affiliated Kunshan First People's Hospital, Jiangsu University) ;
  • Hu, Yong-Wei (Department of Surgery, the Affiliated Kunshan First People's Hospital, Jiangsu University) ;
  • Fang, Wen-Zheng (Department of Oncology Fuzhou General Hospital of Nanjing Command) ;
  • Ding, Hou-Zhong (Department of Surgery, the Affiliated Kunshan First People's Hospital, Jiangsu University)
  • Published : 2013.01.31

Abstract

Secreted protein acidic and rich in cysteines-like protein 1 (SPARCL1), an extracellular matrix glycoprotein, has been implicated in the pathogenesis of several disorders including cancer. However, little is known about the expression and significance of SPARCL1 in human breast cancer. The aim of this study was to determine the expression pattern and clinicopathological significance of SPARCL1 in a Chinese breast cancer cohort. mRNA and protein expression of SPARCL1 in human breast cancer cell lines and breast cancer tissues was detected using the reverse transcription-polymerase chain reaction, real-time quantitative PCR, and Western blotting, respectively. Immunostaining of SPARCL1 in 282 Chinese breast cancer samples was examined and associations with clinicopathological parameters were analyzed. Compared to the positive expression in immortalized human breast epithelial cells, SPARCL1 was nearly absent in human breast cancer cell lines. Similarly, a significantly reduced expression of SPARCL1 was observed in human breast cancer tissues compared to that in normal breast epithelial tissues, for both mRNA and protein levels (P < 0.001). Immunohistochemical analysis showed that strong cytoplasmic immunostaining of SPARCL1 was observed in almost all normal breast samples (43/45) while moderate and strong immunostaining of SPARCL1 was only detected in 191 of 282 (67.7%) breast cancer cases. Moreover, down-regulation of SPARCL1 was significantly correlated with lymphatic metastasis (P = 0.020) and poor grade (P = 0.044). In conclusion, SPARCL1 may be involved in the breast tumorigenesis and serve as a promising target for therapy of breast cancer.

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