Protein S100-A8: A potential metastasis-associated protein for breast cancer determined via iTRAQ quantitative proteomic and clinicopathological analysis

Zhong,Jing‑Min; Li,Jing; Kang,An‑Ding; Huang,San‑Qian; Liu,Wen‑Bin; Zhang,Yun; Liu,Zhi‑Hong; Zeng,Liang

doi:10.3892/ol.2018.7958

Protein S100-A8: A potential metastasis-associated protein for breast cancer determined via iTRAQ quantitative proteomic and clinicopathological analysis

Authors:
- Jing‑Min Zhong
- Jing Li
- An‑Ding Kang
- San‑Qian Huang
- Wen‑Bin Liu
- Yun Zhang
- Zhi‑Hong Liu
- Liang Zeng
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Affiliations: Department of Pathology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China, Department of Breast Internal Medicine, Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan 410013, P.R. China, Department of Intestinal Surgery, Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan 410013, P.R. China, Department of Pathology, Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, Hunan 410013, P.R. China
Published online on: February 6, 2018 https://doi.org/10.3892/ol.2018.7958
Pages: 5285-5293

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Abstract

Breast cancer is the most common malignancy in females, with metastasis of this type of cancer frequently proving lethal. However, there are still no effective biomarkers to predict breast cancer metastasis. The aim of the present study was, therefore, to analyze breast cancer metastasis‑associated proteins and evaluate the association between protein S100‑A8 and the prognosis of breast cancer. The isobaric tags for relative and absolute quantitation (iTRAQ) proteomic technique was used to analyze the differential expression of proteins between fresh primary breast tumor (PBT) tissue and fresh paired metastatic lymph nodes (PMLN) tissue. Subsequently, immunohistochemical staining was used to locate and assess the expression of protein S100‑A8 in benign breast disease (n=15), primary breast cancer with (n=109) or without (n=83) metastasis, and in paired metastatic lymph nodes (n=109) formalin fixed paraffin embedded (FFPE) tissue. Staining scores were evaluated and the association between protein S100‑A8 expression levels and the clinicopathological characteristics of 192 patients with breast cancer were evaluated using the χ2 test. Kaplan‑Meier and Cox hazards regression analyses were utilized to investigate the association between the expression of protein S100‑A8 and the prognosis of patients with breast cancer. A total of 4,837 proteins were identified using the iTRAQ proteomic technique. Among these proteins, 643 differentially expressed proteins were revealed. Protein S100‑A8 expression levels were identified to differ between PBT and PMLN tissues. Immunohistochemical staining suggested a significant difference between NMBT and PMLN (P=0.002), and also between PBT and PMLN (P<0.001). Cox hazards regression model analyses suggested that histological grade (P=0.031) and nodal status (P=0.001) were risk factors for lymph nodes metastasis of breast cancer. Kaplan‑Meier analyses revealed no significant relationship between protein S100‑A8 expression level and overall survival rate of patients with breast cancer. In conclusion, by using the iTRAQ proteomic technique and immunohistochemistry staining, it was identified that protein S100‑A8 may be associated with lymph nodes metastasis of breast cancer and be a marker for progression of breast cancer.

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