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2016 ; 35
(ä): 42
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The clinicopathological significance of Mortalin overexpression in invasive
ductal carcinoma of breast
#MMPMID26955804
Jin H
; Ji M
; Chen L
; Liu Q
; Che S
; Xu M
; Lin Z
J Exp Clin Cancer Res
2016[Mar]; 35
(ä): 42
PMID26955804
show ga
BACKGROUND: Mortalin/GRP75 is a ubiquitous mitochondrial chaperone which related
to the cytosolic heat shock protein 70 (HSP70), and plays a role in
carcinogenesis. This study aims to investigate the Mortalin expression in breast
cancer and its correlation with the outcome of the patients with breast cancer.
METHODS: A total of 155 invasive ductal carcinoma of breast patients with strict
follow-up, 52 ductal carcinoma in situ (DCIS) and 45 adjacent non-tumor breast
tissues were selected for immunohistochemical (IHC) staining of Mortalin protein.
The localization of Mortalin protein was detected in MDA-MB231 breast cancer
cells using immunofluorescence (IF) staining. The correlations between
overexpression of Mortalin and the clinical features of patients with breast
cancer were evaluated using chi-square test and Fisher's exact tests. The
survival rates were calculated by the Kaplan-Meier method, and the relationship
between prognostic factors and patient survival was also analyzed by the Cox
proportional hazard models. RESULTS: Mortalin protein showed a mainly cytoplasmic
staining pattern in breast cancers by using IHC staining in paraffin embedded
breast cancer tissues and IF staining in MDA-MB231 breast cancer cells. The
strongly positive rate of Mortalin protein was 63.9% (99/155) in invasive ductal
carcinoma of breast and was significantly higher than in DCIS 34.6% (18/52) and
adjacent non-tumor tissues 15.6% (7/45). Overexpression of Mortalin was closely
correlated with histological grade, clinical stage, lymph node metastasis, lower
disease free survival (DFS) and overall survival (OS) rates of patients with
breast cancer. Moreover, multivariate analysis suggested that Mortalin emerged as
a significant independent prognostic factor along with clinical stage and Her2
expression status in patients with breast cancer. CONCLUSIONS: Mortalin is
upregulated in breast cancer, and may be a useful poor prognostic biomarker as
well as a potential therapeutic target for patients with breast cancer.