Structural imaging of the pancreas in rat using micro-CT: application to a non-invasive longitudinal evaluation of pancreatic ductal carcinoma monitoring

Abstract

The aim of the study was to evaluate the feasibility of a longitudinal non-invasive monitoring of rat pancreatic ductal adenocarcinoma (PDAC) using microCTscans (CT). The identification of the pancreatic gland on (CT) was performed at first using contrast products (Fenestra LC and VC, v/v) at a dosage of 0.5 ml/Kg of body weight. Then orthotopic PDAC developed in adult Lewis rat was detected and monitored. In vivo CT measurement of tumor was compared to actual size ex vivo in 12 rats. Gemcitabine treatment of PDAC was monitored at two week intervals until defined endpoints (liver metastasis or ascitis) in 10 rats versus 10 controls. CT had a 100% positive predictive value in the detection of orthotropic PDAC. Regression analysis showed a linear correlation between ex vivo and in vivo CT tumor measurements. Longitudinal evaluation of tumor progression showed a reduction in tumor growth (P<0.05 at 8 weeks) and a slightly prolonged survival (P=0.15) under gemcitabine treatment. In conclusion CT appears to be a cost-effective mean for preclinical study of PDAC saving time, animals, while respecting animal welfare. It could be considered as an efficient tool in anticancer drug research and development.