PiH, really feel for you and your beautiful wife, it sure is something none of us can fully comprehend unless we've been there with a loved one.
If your beautiful wife has localised tumor/s please read up on American Doctor, Dr. Patrick Sewell and his amazing work - is/was the head of an Oncology Dept. in one of USA's biggest hospitals - he & his colleagues t/out USA & Canada (trained by him) have an incredible non-invasive way of blasting tumors from here to kingdom come and have a 99.8% or 98.9% (can't remember which) total success rate. In China he does the procedure under local anaesthetic in day surgery, in USA patients stay in overnight.