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2016 ; 11
(9
): e0162933
Nephropedia Template TP
gab.com Text
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English Wikipedia
SPOCK1 Is a Novel Transforming Growth Factor-?-Induced Myoepithelial Marker That
Enhances Invasion and Correlates with Poor Prognosis in Breast Cancer
#MMPMID27626636
Fan LC
; Jeng YM
; Lu YT
; Lien HC
PLoS One
2016[]; 11
(9
): e0162933
PMID27626636
show ga
In addition to contraction, myoepithelia have diverse paracrine effects,
including a tumor suppression effect. However, certain myoepithelial markers have
been shown to contribute to tumor progression. Transforming growth factor-?
(TGF-?) is involved in the transdifferentiation of fibroblasts to contractile
myofibroblasts. We investigated whether TGF-? can upregulate potential
myoepithelial markers, which may have functional and clinicopathological
significance in breast cancer. We found that TGF-? induced SPOCK1 expression in
MCF10A, MCF12A, and M10 breast cells and demonstrated SPOCK1 as a novel
myoepithelial marker that was immunolocalized within or beneath myoepithelia
lining ductolobular units. A functional study showed that overexpression of
SPOCK1 enhanced invasiveness in mammary immortalized and cancer cells. To further
determine the biological significance of SPOCK1 in breast cancer, we investigated
the expression of SPOCK1 in 478 invasive ductal carcinoma (IDC) cases through
immunohistochemistry and correlated the expression with clinicopathological
characteristics. SPOCK1 expression was significantly correlated with high
pathological tumor size (P = 0.012), high histological grade (P = 0.013), the
triple-negative phenotype (P = 0.022), and the basal-like phenotype (P = 0.026)
and was correlated with a significantly poorer overall survival on univariate
analysis (P = 0.001, log-rank test). Multivariate Cox regression analysis
demonstrated that SPOCK1 expression maintained an independent poor prognostic
factor of overall survival. Analysis of SPOCK1 expression on various non-IDC
carcinoma subtypes showed an enrichment of SPOCK1 expression in metaplastic
carcinoma, which is pathogenetically closely related to epithelial-mesenchymal
transition (EMT). In conclusion, we identified SPOCK1 as a novel TGF-?-induced
myoepithelial marker and further demonstrated that SPOCK1 enhanced invasion in
breast cancer cells and correlated with poor prognosis in breast cancer clinical
samples. The enrichment of SPOCK1 expression in metaplastic carcinoma and the
correlation between SPOCK1 expression and high histological grading and
basal-like phenotypes in IDC evidence an association between SPOCK1 and EMT.