The histone chaperone HJURP is a new independent prognostic marker for luminal A breast carcinoma.

Abstract:

BACKGROUND:Breast cancer is a heterogeneous disease with different molecular subtypes that have varying responses to therapy. An ongoing challenge in breast cancer research is to distinguish high-risk patients from good prognosis patients. This is particularly difficult in the low-grade, ER-positive luminal A tumors, where robust diagnostic tools to aid clinical treatment decisions are lacking. Recent data implicating chromatin regulators in cancer initiation and progression offers a promising avenue to develop new tools to help guide clinical decisions. METHODS:Here we exploit a published transcriptome dataset and an independent validation cohort to correlate the mRNA expression of selected chromatin regulators with respect to the four intrinsic breast cancer molecular subtypes. We then perform univariate and multivariate analyses to compare the prognostic value of a panel of chromatin regulators to Ki67, a currently utilized proliferation marker. RESULTS:Unsupervised hierarchical clustering revealed a gene cluster containing several histone chaperones and histone variants highly-expressed in the proliferative subtypes (basal-like, HER2-positive, luminal B) but not in the luminal A subtype. Several chromatin regulators, including the histone chaperones CAF-1 (subunits p150 and p60), ASF1b, and HJURP, and the centromeric histone variant CENP-A, associated with local and metastatic relapse and poor patient outcome. Importantly, we find that HJURP can discriminate favorable and unfavorable outcome within the luminal A subtype, outperforming the currently utilized proliferation marker Ki67, as an independent prognostic marker for luminal A patients. CONCLUSIONS:The integration of chromatin regulators as clinical biomarkers, in particular the histone chaperone HJURP, will help guide patient substratification and treatment options for low-risk luminal A breast carcinoma patients.

journal_name

Mol Oncol

journal_title

Molecular oncology

authors

Montes de Oca R,Gurard-Levin ZA,Berger F,Rehman H,Martel E,Corpet A,de Koning L,Vassias I,Wilson LO,Meseure D,Reyal F,Savignoni A,Asselain B,Sastre-Garau X,Almouzni G

doi

10.1016/j.molonc.2014.11.002

subject

Has Abstract

pub_date

2015-03-01 00:00:00

pages

657-74

issue

3

eissn

1574-7891

issn

1878-0261

pii

S1574-7891(14)00267-1

journal_volume

9

pub_type

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