I've had two friends with pancreatic cancer. One was 43 and after doing one session of chemo he said fuck it and decided to live out the rest of his life with no treatment, he lived 18 months from the time he was diagnosed.
The other was 61, he went to one of the best hospitals in the world and did the whole gambit of treatment. He responded so good the Dr's said they rarely seen someone like him. He was for a short period of time almost in remission. During his break from chemo the cancer came back, he lived 18 months from the time he was diagnosed.