GEM and familial pancreatic carcinoma: To address the potential role of PVT1 in the gemcitabine sensitivity of pancreatic cancer cells, we first stably overexpressed PVT1 in the PANC-1 and SW1990 human pancreatic cancer cell lines and knocked down PVT1 expression in the gemcitabine (Gem) resistant PANC-1/Gem and SW1990/Gem cell lines by using lentiviral transfection.