Cytoplasmic Trop-1/Ep-CAM overexpression is associated with a favorable outcome in node-positive breast cancer.

Abstract:

OBJECTIVE:Trop-1/Ep-CAM modulates growth and survival of transformed cells, and it is highly expressed in most carcinomas including breast cancer. Only membranous staining is typically considered in evaluating Trop-1/epithelial cell adhesion molecule (Ep-CAM) expression in tumor cells. However, there is evidence of retention of Trop-1/Ep-CAM, as functionally incompetent molecules, in intra-cytoplasmic vesicles. Hence, we investigated whether cytoplasmic immunostaining may have an independent clinical significance with respect to membranous staining. METHODS:Membranous and cytoplasmic Trop-1/Ep-CAM expression was immunohistochemically investigated in 642 unilateral breast cancers from patients with a 99-month median follow-up. Multiple correspondence analysis was used to investigate the association between Trop-1/Ep-CAM and other biological variables. The impact of Trop-1/Ep-CAM expression on the patient's outcome was evaluated as event-free survival by the Kaplan-Meier method and proportional hazard Cox model. RESULTS:While tumors with intermediate/strong membranous staining were mostly associated with concomitant cytoplasmic Trop-1/Ep-CAM expression (97%), tumors with weak-to-nil membranous staining showed intermediate/high cytoplasmic expression in 23% of cases. Cytoplasmic overexpression was associated with a favorable outcome, especially in node-positive patients, regardless of the adjuvant therapy received. CONCLUSION:Trop-1/Ep-CAM expression may have different clinical implications according to its subcellular localization.

journal_name

Jpn J Clin Oncol

authors

Alberti S,Ambrogi F,Boracchi P,Fornili M,Querzoli P,Pedriali M,La Sorda R,Lattanzio R,Tripaldi R,Piantelli M,Biganzoli E,Coradini D

doi

10.1093/jjco/hys159

subject

Has Abstract

pub_date

2012-12-01 00:00:00

pages

1128-37

issue

12

eissn

0368-2811

issn

1465-3621

pii

hys159

journal_volume

42

pub_type

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