In my case, my oncologist was going to put me on Xeloda after my 12 chemo sessions. He told me that the body converts Xeloda to Fluorouracil and Fluorouracil was one of the meds. in the Folfirinox chemo treatments. And was responsible for terrible mouth sores. I suffered from those and I was dreading starting on Xeloda due to this side effect. I found the NIH PACC clinical trial using Olaparib and talked it over with my oncologist and he was very much in favor of me trying to get accepted. At least there are no mouth sores on Olaparib. Just returned from the NIH today and the CT scan they did yesterday was good news. I've still got a long way to go if the med. continues to do it's job.