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Differential Distribution of microRNAs in Breast Cancer Grouped by Clinicopathological Subtypes

  • Li, Jian-Yi (Department of Breast Surgery, Shengjing Hospital of China Medical University) ;
  • Jia, Shi (Department of Breast Surgery, Shengjing Hospital of China Medical University) ;
  • Zhang, Wen-Hai (Department of Breast Surgery, Shengjing Hospital of China Medical University) ;
  • Zhang, Yang (Department of Breast Surgery, Shengjing Hospital of China Medical University) ;
  • Kang, Ye (Department of Breast Surgery, Shengjing Hospital of China Medical University) ;
  • Li, Pi-Song (Department of Breast Surgery, Shengjing Hospital of China Medical University)
  • Published : 2013.05.30

Abstract

Background: microRNAs (miRNAs) that regulate proliferation, invasion and metastasis are considered to be the principal molecular basis of tumor heterogeneity. Breast cancer is not a homogeneous tissue. Thus, it is very important to perform microarray-based miRNA screening of tumors at different sites. Methods: Breast tissue samples from the centers and edges of tumors of 30 patients were classified into 5 clinicopathological subtypes. In each group, 6 specimens were examined by microRNA array. All differential miRNAs were analyzed between the edges and centers of the tumors. Results: Seventeen kinds of miRNAs were heterogeneously distributed in the tumors from different clinicopathological subtypes that included 1 kind of miRNA in Luminal A and Luminal B Her2+ subtypes, 4 kinds in Luminal A and Her2 overexpression subtypes, 6 kinds in Luminal B Ki67+ and Luminal B Her2+ subtypes, 2 kinds between Luminal B Ki67+ and triple-negative breast cancer (TNBC) subtypes, 2 kinds between Luminal B Her2+ and TNBC subtypes, and 2 kinds between Luminal B Ki67+, Luminal B Her2+, and TNBC subtypes. Twenty kinds of miRNAs were homogenously distributed in the tumors from different clinicopathological subtypes that included 6 kinds of miRNAs in Luminal B Ki67+ and Luminal B Her2+ subtypes, 1 kind in Luminal B Ki67+ and Her2 overexpression subtypes, 10 kinds between Luminal B Ki67+ and TNBC subtypes, 2 kinds in Luminal B Her2+ and TNBC subtypes, and 1 kind between Luminal B Ki67+, Luminal B Her2+, and TNBC subtypes. Conclusions: A total of 37 miRNAs were significantly distributed in tumors from the centers to edges, and in all clinicopathological subtypes.

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