@jakedduck1 The 11% came from my oncologist when I asked point-blank but I have confirmed that with online research. I think it’s a case of when it metastasizes it’s not as easy to pinpoint so more difficult to treat than if you had a primary cancer. My husband had prostrate cancer and with it also, if it recurred there would be a much lower chance of being able to eradicate it. It’s been three years on Monday since my transplant so I’m feeling that I’m pretty much out of the woods. Two more MRIs and they will consider it to not be a threat.