Caveolin-1 expression as a prognostic marker in triple negative breast cancers of Asian women.

Abstract:

BACKGROUND:Triple-negative breast cancers (TNBCs) are defined by their lack of oestrogen receptor, progesterone receptor and epidermal growth factor receptor 2. Although heterogeneous, the majority are aggressive and treatment options are limited. Caveolin acts as tumour suppressor or promoter depending on the cancer type. AIM:In this study, we aimed to determine if the expression levels of the candidate biomarker caveolin-1 on stromal or tumour cells were associated with clinicopathological parameters and disease outcomes in TNBCs from an ethnically diverse cohort of Asian women. METHODS:Tumour specimens from 699 women with TNBC were subjected to immunohistochemical analysis of the frequency and intensity of caveolin-1 expression in tumour and stromal cells. A subset of 141 tumour samples also underwent Nanostring measurement of CAV1 mRNA. Results were correlated with clinicopathological parameters and disease outcomes. RESULTS:Expression of caveolin-1 in stromal cells was observed in 14.4% of TNBC cases. TNBCs of the basal-like phenotype (85% of samples) were significantly more likely to exhibit stromal cell caveolin-1 expression (p=0.028), as were those with a trabecular growth pattern (p=0.007). Lack of stromal caveolin-1 expression in both TNBCs and those with the basal-like phenotype was significantly associated with worse overall survival (p=0.009 and p=0.026, respectively): accordingly, increasing mRNA levels of CAV1 in TNBC samples predicted better overall survival. Caveolin-1 expression on TNBC tumour cells was not associated with clinical outcome. CONCLUSION:Stromal, but not tumoural, caveolin-1 expression is significantly associated with survival in Asian women with TNBC.

journal_name

J Clin Pathol

authors

Yeong J,Thike AA,Ikeda M,Lim JCT,Lee B,Nakamura S,Iqbal J,Tan PH

doi

10.1136/jclinpath-2017-204495

subject

Has Abstract

pub_date

2018-02-01 00:00:00

pages

161-167

issue

2

eissn

0021-9746

issn

1472-4146

pii

jclinpath-2017-204495

journal_volume

71

pub_type

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