My mother in law has been diagnosed with pancreatic cancer. She has undergone about 6 sessions of Chemotherapy which has significantly shrunk the cancer. She is considering surgery but the doctor says that if it has spread then that might be a significant reason not too. The doctor suggested that she under go more chemo to see if it will shrink more. Question is: Why are they waiting to do a PET scan? Why would you undergo more Chemo if the cancer has spread? Just confused about the decision to go this route. Please advise?