HSP90B2P and familial pancreatic carcinoma: For in vitro cell viability studies with AsPC-1 pancreatic cancer cells, OSU030312-loaded iRGD-Hsp (IC50 = 4.7 μM) was found to be slightly more cytotoxic than OSU030312-Hsp (IC50 = 5.4 μM) and up to two-fold more cytotoxic than free OSU030312 (IC50 = 10 μM).