LAMP1 expression is associated with poor prognosis in breast cancer

Wang,Qingqing; Yao,Juan; Jin,Qin; Wang,Xudong; Zhu,Huijun; Huang,Fan; Wang,Wei; Qiang,Jianfeng; Ni,Qichao

doi:10.3892/ol.2017.6757

LAMP1 expression is associated with poor prognosis in breast cancer

Authors:
- Qingqing Wang
- Juan Yao
- Qin Jin
- Xudong Wang
- Huijun Zhu
- Fan Huang
- Wei Wang
- Jianfeng Qiang
- Qichao Ni
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Affiliations: Department of General Surgery, The Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China, Medical School, The Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China, Department of Pathology, The Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China, Surgical Comprehensive Laboratory, The Affiliated Hospital of Nantong University, Nantong, Jiangsu 226001, P.R. China
Published online on: August 16, 2017 https://doi.org/10.3892/ol.2017.6757
Pages: 4729-4735
Copyright: © Wang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Lysosome associated membrane protein‑1 (LAMP1) is a heavily glycosylated lysosomal membrane protein, which is able to protect the lysosomal membrane from intracellular proteolysis. LAMP1 has been implicated in cancer development and progression. However, LAMP1 expression in breast cancer (BC) and its relationship with the clinical parameters of BC has not yet been fully investigated. In the present study, LAMP1 expression in BC was characterized by reverse transcription‑quantitative polymerase chain reaction (RT‑qPCR) on 20 pairs of fresh‑frozen BC and corresponding non‑cancerous tissues. In addition, tissue microarray immunohistochemistry (TMA‑IHC) was conducted on 143 BC and matched non‑cancerous tissue samples. The results of RT‑qPCR and TMA‑IHC demonstrated that LAMP1 expression in BC tissues was significantly higher than in corresponding non‑cancerous tissues. Furthermore, LAMP1 protein expression levels were significantly associated with histological grade (P=0.047), estrogen receptor expression (P=0.003), progesterone receptor expression (P=0.002), molecular classification (P=0.022), lymph node metastasis (P=0.033) and tumor‑node‑metastasis (TNM) stage (P=0.012). Multivariate analysis using Cox regression models and Kaplan‑Meier survival curves demonstrated that LAMP1 expression (P=0.037), molecular classification (P=0.017) and TNM stage (P=0.003) were independent prognostic factors for overall survival. The above data suggested that LAMP1 expression is associated with malignant attributes of BC and may serve as a novel prognostic factor for patients with BC.

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