Abstract:
:Tissue factor (TF)-mediated protease-activated receptor (PAR)-2 signaling is associated with a promigratory, invasive and proangiogenic phenotype in experimental models of breast cancer and has been mechanistically coupled to phosphorylation of the TF cytoplasmic domain (pTF). However, the clinical relevance of these findings is unknown. Here, we provide the first in vivo evidence of TF phosphorylation in experimental as well as clinical breast cancer tumors. pTF was demonstrated in MDA-MB-231 xenografts and in tumors from the MMTV-PyMT transgene model of spontaneous murine breast adenocarcinoma. Tumors from PAR-2-deficient transgenic mice were negative for pTF, thus linking pTF to PAR-2 signaling. The clinical correlation between TF, pTF, PAR-1, PAR-2 and vascular endothelial growth factor (VEGF)-A was determined by immunohistochemistry on tumors from a cohort of 172 consecutive primary breast cancer patients, with a median follow-up time of 50 months. In 160 evaluable patient tumors, pTF was associated with TF (p = 0.01) and cancer cell expression of PAR-1 (p = 0.001), PAR-2 (p = 0.014) and VEGF-A (p = 0.003) using chi(2) test. PAR-2 and VEGF-A were coexpressed (p = 0.013) and associated with a more aggressive phenotype. Interestingly, all patients experiencing recurrences had tumors expressing pTF and PAR-2, and pTF alone as well as coexpression of pTF and PAR-2 were significantly correlated with shorter recurrence-free survival (log rank test, p = 0.04 and p = 0.02, respectively). This study provides the first evidence to link PAR-2 expression and TF phosphorylation to clinical data in human breast cancer. In conjunction with experimental tumor models, these data support an important role of TF-PAR-2 signaling in breast cancer recurrence.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Rydén L,Grabau D,Schaffner F,Jönsson PE,Ruf W,Belting Mdoi
10.1002/ijc.24921subject
Has Abstractpub_date
2010-05-15 00:00:00pages
2330-40issue
10eissn
0020-7136issn
1097-0215journal_volume
126pub_type
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