(A) Plasma glucose levels over time in autochthonous LSL-KrasG12D/+; Trp53fl/fl; Pdx1-Cre (KP-/-C) or autochthonous LSL-KrasG12D/+; Trp53R172H/+; Pdx1-Cre (KPC) pancreatic tumor-bearing mice infused with U-13C-glucose at a rate of 0.4 mg/min. Here, PDX1 is linked to pancreatic neoplasm.