Interleukin-6 Is Required for Pancreatic Cancer Progression by Promoting MAPK Signaling Activation and Oxidative Stress Resistance by Zhang, Yaqing, Yan, Wei, Collins, Meredith A., Bednar, Filip, Rakshit, Sabita, Zetter, Bruce R., Stanger, Ben Z., Chung, Ivy, Rhim, Andrew D., di Magliano, Marina Pasca