text:  Pdx1-Cre+;PtenL/W;K-rasG12D/W, Cox-2 KO/KO, biological rep1 Murine Pdx1-Cre+;PtenL/W;K-rasG12D/W, Cox-2 KO/KO pancreas strain background: mixed C57/BL/6,129/BALB/c; genotype/variation: Pdx1-Cre+;PtenL/W;K-rasG12D/W,Cox-2 KO/KO; genotype/variation: loss of Pten (Pten +/-) and K-ras activation (K-rasG12D) with COX-2 knockout (Cox-2 KO); age: older than 8 weeks; tissue: pancreatic tumor