EMAP II-based antiangiogenic-antiendothelial in vivo combination therapy of pancreatic cancer.

Abstract:

BACKGROUND:Pancreatic ductal adenocarcinoma (PDAC) frequently resists conventional cytotoxic therapy. The antitumor effects of endothelial monocyte-activating polypeptide II (EMAP) have been attributed to its antiendothelial and antiangiogenic activities. We tested the hypothesis that a combination of EMAP with bevacizumab (Bev) and gemcitabine (Gem) targets different pathways of PDAC progression and represents more effective treatment. METHODS:Proliferation of PDAC and endothelial cell lines was evaluated in vitro. In vivo tumor growth and survival PDAC xenograft experiments were performed with EMAP, Bev, and Gem, either alone or in combination. Intratumoral microvessel density and proliferative activity were analyzed by immunostaining with PECAM-1 and proliferating cell nuclear antigen antibodies, and apoptotic activity was measured by the TUNEL (terminal deoxynucleotidyl transferase dUTP nick-end labeling) procedure. RESULTS:Compared with controls, net reduction in tumor growth in EMAP, Bev, Gem, EMAP + Bev, EMAP + Gem, Bev + Gem, and EMAP + Bev + Gem groups was 58, 40, 40, 67, 68, 69, and 96%, respectively. Addition of EMAP to the Bev + Gem group statistically significantly improved survival at a median of >8 days while inducing long-term survival in some animals after maintenance therapy. Combination treatment of EMAP with Bev and Gem reduced proliferation of endothelial but not of PDAC cells. Addition of EMAP to Bev and Gem statistically significantly decreased proliferative activity while maintaining a comparable rate of microvessel density and apoptosis. CONCLUSIONS:Addition of antiendothelial EMAP to a Bev and Gem regimen improves antitumor effects in a xenograft model of PDAC. This multitargeting strategy to prevent PDAC progression shows therapeutic promise and may overcome limitations by combinations of Gem with anti-vascular endothelial growth factor agents alone.

journal_name

Ann Surg Oncol

authors

Schwarz RE,Awasthi N,Konduri S,Cafasso D,Schwarz MA

doi

10.1245/s10434-009-0879-5

subject

Has Abstract

pub_date

2010-05-01 00:00:00

pages

1442-52

issue

5

eissn

1068-9265

issn

1534-4681

journal_volume

17

pub_type

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