Gastric cancer modeling in immunodeficient mice with orthotopic xenotransplantation

Abstract

Purpose of the study. Creation of a transplantable orthotopic PDX model of gastric cancer in Balb/c Nude immunodeficient mice using implantation and injection.Materials and methods. Two methods, that are injection and implantation, were used to create an orthotopic PDX model of human gastric cancer. The first method involved injections of a suspension of a mechanically disaggregated patient's tumor after filtration into the gastric wall of Balb/c Nude mice. For the second method, small fragments (3 × 3 × 3 mm) of patients' tumors were implanted in the gastric wall of mice along the greater curvature with a dissection of the serous muscular layer.Results. Control laparotomy in Balb/c Nude immunodeficient mice showed a successful engraftment of the tumor material at the 1st and 3rd procedures when using the implantation method for the creation of a PDX model of gastric cancer. The injection method was ineffective, and no models were created. The histological type of the obtained PDX models was compared to the type of the donor tumor by histological examination (hematoxylin and eosin staining). The tumor grade remained stable and did not change during xenograft passage, which showed that the obtained model was identical to the histotype of the donor tumor.Conclusion. The presented implantation method for the model creation results in effective tumor engraftment. The developed model can be used to test the effectiveness of anticancer or antimetastatic drugs, for studying the functions of biomarkers, or in assessing the microenvironment of a gastric cancer.