Her-2 overexpression increases the metastatic outgrowth of breast cancer cells in the brain.

Abstract:

:Retrospective studies of breast cancer patients suggest that primary tumor Her-2 overexpression or trastuzumab therapy is associated with a devastating complication: the development of central nervous system (brain) metastases. Herein, we present Her-2 expression trends from resected human brain metastases and data from an experimental brain metastasis assay, both indicative of a functional contribution of Her-2 to brain metastatic colonization. Of 124 archival resected brain metastases from breast cancer patients, 36.2% overexpressed Her-2, indicating an enrichment in the frequency of tumor Her-2 overexpression at this metastatic site. Using quantitative real-time PCR of laser capture microdissected epithelial cells, Her-2 and epidermal growth factor receptor (EGFR) mRNA levels in a cohort of 12 frozen brain metastases were increased up to 5- and 9-fold, respectively, over those of Her-2-amplified primary tumors. Co-overexpression of Her-2 and EGFR was also observed in a subset of brain metastases. We then tested the hypothesis that overexpression of Her-2 increases the colonization of breast cancer cells in the brain in vivo. A subclone of MDA-MB-231 human breast carcinoma cells that selectively metastasizes to brain (231-BR) overexpressed EGFR; 231-BR cells were transfected with low (4- to 8-fold) or high (22- to 28-fold) levels of Her-2. In vivo, in a model of brain metastasis, low or high Her-2-overexpressing 231-BR clones produced comparable numbers of micrometastases in the brain as control transfectants; however, the Her-2 transfectants yielded 3-fold greater large metastases (>50 microm(2); P < 0.001). Our data indicate that Her-2 overexpression increases the outgrowth of metastatic tumor cells in the brain in this model system.

journal_name

Cancer Res

journal_title

Cancer research

authors

Palmieri D,Bronder JL,Herring JM,Yoneda T,Weil RJ,Stark AM,Kurek R,Vega-Valle E,Feigenbaum L,Halverson D,Vortmeyer AO,Steinberg SM,Aldape K,Steeg PS

doi

10.1158/0008-5472.CAN-06-3316

subject

Has Abstract

pub_date

2007-05-01 00:00:00

pages

4190-8

issue

9

eissn

0008-5472

issn

1538-7445

pii

67/9/4190

journal_volume

67

pub_type

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