ArticleJournal of cancer research and clinical oncology2007
Tumor specificity and in vivo targeting of an antibody against exon 9 deleted E-cadherin in gastric cancer.
Article in Journal of cancer research and clinical oncology, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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8 authors at 3 institutions in 4 countries.
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Abstract
purposeThe aim of this study was to evaluate the possibility of using a monoclonal antibody against exon 9 deleted E-cadherin (E-cad delta 9-1) for immunotherapy of gastric cancer.
methodsAmong nine human diffuse-type gastric cancer cell lines, we selected a cell line expressing exon 9 deleted E-cadherin (HSC-45M2) by direct sequencing. Tumor specificity and tumor specific in vivo targeting of E-cad delta 9-1 were evaluated in nude mouse bearing a tumor derived from HSC-45M2 cell line by immunohistochemical staining. The expression rate of E-cad delta 9-1 was evaluated in 299 gastric cancer patients, and in positive cases, the mutational status of E-cadherin exon 9 was examined.
resultsImmunohistochemical staining of various tissues from nude mice showed that only tumor tissue reacted with E-cad delta 9-1. However, immunohistochemical staining of the same tissues after systemic injection of E-cad delta 9-1 showed that reticuloendothelial and hypervascular organs reacted with E-cad delta 9-1, but tumor tissue showed only a slight reaction. Evaluation of the reactivity of 299 gastric cancer patients to E-cad delta 9-1 showed that 4.8% (9/187) of patients, who all had diffuse- or mixed-type gastric cancers, reacted positively, but none of the 112 intestinal-type gastric cancer patients reacted positively. Two of 9 patients (22%) with positive staining to E-cad delta 9-1 were confirmed to have mutant forms of E-cadherin exon 9.
conclusionConsidering that E-cad delta 9-1 showed good tumor specificity and that some diffuse-type gastric cancers were immunopositive to it, this antibody could be a candidate therapeutic antibody against gastric cancers that express mutant E-cadherin.
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