Phase II trial of single agent Val-boroPro (Talabostat) inhibiting Fibroblast Activation Protein in patients with metastatic colorectal cancer.

Abstract:

PURPOSE:Fibroblast Activation Protein (FAP) is a tumor fibroblast protease that has been shown to potentiate colorectal cancer growth. The clinical impact of FAP inhibition was tested using Val-boroPro (Talabostat), the first clinical inhibitor of FAP enzymatic activity, in a phase II study of patients with metastatic colorectal cancer. METHODS:Patients with metastatic colorectal cancer who had previously received systemic chemotherapies were treated with single agent Val-boroPro 200 microg p.o. BID continuously. Eligibility included measurable disease, performance status of 0 to 2, and adequate organ function. Laboratory correlates evaluated the pharmacodynamic effects of Val-boroPro on FAP enzymatic function in the peripheral blood. RESULTS:Twenty-eight patients (median age 62; 12 males, 16 females) were enrolled in this study. There were no objective responses. Six of 28 (21%) patients had stable disease for a median of 25 weeks (range 11-38 weeks). Laboratory analysis demonstrated significant, although incomplete inhibition of FAP enzymatic activity in the peripheral blood. CONCLUSION:This phase II trial of Val-boroPro demonstrated minimal clinical activity in patients with previously treated metastatic colorectal cancer. However it provides the initial proof-of-concept that physiologic inhibition of FAP activity can be accomplished in patients with colorectal cancer, and lays the groundwork for future studies targeting the tumor stroma.

journal_name

Cancer Biol Ther

journal_title

Cancer biology & therapy

authors

Narra K,Mullins SR,Lee HO,Strzemkowski-Brun B,Magalong K,Christiansen VJ,McKee PA,Egleston B,Cohen SJ,Weiner LM,Meropol NJ,Cheng JD

doi

10.4161/cbt.6.11.4874

subject

Has Abstract

pub_date

2007-11-01 00:00:00

pages

1691-9

issue

11

eissn

1538-4047

issn

1555-8576

pii

4874

journal_volume

6

pub_type

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