#6 is very important. Sadly the internet does not have all the information on various cancers one would think. Medical research is not easily found with a Google search.
The first instinct is to Google your anticipated surgery and treatments. That’s fine, but as you pointed out one size may not fit all.
I would add another point. Prior to my colon cancer surgery, the surgeon, and oncologist were confident my cancer was Stage 1. However the post op analysis of the cancerous tissue removed is the defining event. I was upgraded to 3a after the post OP pathology report.
That is why I strongly recommend that with the diagnosis of especially a higher mortality cancer, the patient seriously consider moving themselves to a research node known for that particular type of cancer.
Phoenix has particularly concentrated research for breast cancer, for example, and a top Oncologist sometimes explains the situation on the radio: how patients should go about getting treatment in ways most likely to minimize harm and save their life.