This is an open-label, single-center, non-randomized, single-arm, pilot imaging study to determine the pharmacokinetics, biodistribution, and tumor targeting of an indium-111 (111In)-labeled, humanized anti-MUC1 antibody, designated hPAM4 IgG1 in patients with known pancreatic cancer. The primary objective of this trial is to examine how changing the protein dose will affect these parameters with the intent to determine if a single protein dose can be selected to optimize tumor targeting. It is expected that these data will aid in the selection of an appropriate protein dose to be used in a Phase I therapy trial with yttrium-90 (90Y)-labeled hPAM4 IgG. The secondary objective is to monitor safety.