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Japanese Journal of Cancer Research : Gann logoLink to Japanese Journal of Cancer Research : Gann
. 2000 Jul;91(7):723–730. doi: 10.1111/j.1349-7006.2000.tb01005.x

Effect of Angiostatin on Liver Metastasis of Pancreatic Cancer in Hamsters

Ken Yanagi 1,✉, Masahiko Onda 1, Eiji Uchida 1
PMCID: PMC5926410  PMID: 10920280

Abstract

The liver is the most common site of metastasis in pancreatic cancer, and there are no promising strategies to treat it. Angiostatin, a kringle‐containing fragment of plasminogen, is a potent inhibitor of angiogenesis. The effect of angiostatin on liver metastasis in pancreatic cancer was investigated by using our established hamster model of liver metastasis. Pancreatic cancer cells (PGHAM‐1, 1x106) derived from N‐nitrosobis(2‐oxopropyl)amine (BOP)‐induced pancreatic tumor in Syrian golden hamsters were transplanted into the spleen of female hamsters, and the animals were subcutaneously injected with angiostatin and saline. Subsequently, the macroscopic appearance of liver surface metastases was evaluated. In addition, histological sections of the liver metastases were analyzed for neovascularization, proliferation, and apoptosis on the basis of von Willebrand factor, argyrophilic nucleolar organizer region (Ag‐NOR), and TdT‐mediated dUTP‐biotin nick end labeling (TUNEL) staining, respectively. The results showed significant tumor growth retardation and inhibition of angiogenesis in metastatic liver tumors in response to treatment with angiostatin. Moreover, the metastases remained in a nearly dormant state due to a balance between apoptosis and proliferation of the tumor, with no detectable side effects. This is the first experimental trial of angiostatin on pancreatic cancer and liver metastasis. The results suggest that angiostatin therapy could be effective against liver metastases of pancreatic cancer.

Keywords: Angiostatin, Pancreatic cancer, Liver metastasis, Angiogenesis, Hamster

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