Oncogenic K-Ras signals through epidermal growth factor receptor and wild-type H-Ras to promote radiation survival in pancreatic and colorectal carcinoma cells. by Cengel, K, Voong, K, Chandrasekaran, S, Maggiorella, L, Brunner, T, Stanbridge, E, Kao, G, Mckenna, W, Bernhard, E