ARG1 and pancreatic ductal adenocarcinoma: In order to determine which cancer cell types are more sensitive to the arginase activity, leading to arginine deprivation, we determined, by the XTT method, the cell growth inhibition profile of GST-ARG1 using the National Cancer Institute (NCI)-60 cancer cell line panel as well as several human pancreatic ductal adenocarcinoma cell lines.