Mine didn’t move to the bones, but was an occult tumor (also known as an unknown primary), that showed up in a ureter, & had blocked, & ultimately killed the kidney. At first it was diagnosed as a rare ureter cancer, stage IV. Then 18 months later showed up as an anorectal squamous cell cancer. I’ve heard “that shouldn’t happen”, “that’s very rare”, even “I don’t believe that” at MD Andersen from the worst dr I’ve seen. It’s very hard to hear those things. I find them unhelpful. In thinking about it, I’ve decided what difference does it make if it’s unusual, rare, or I don’t fit the disease profile. This is where I am, we’re moving forward as best as we can. When it’s said now, I just think “right, I’m unique, lucky me”, & continue on. I guess my point is, I can try to figure out why, but probably never will, so I choose to let that go. I hope that is helpful to you. I’ve learned that all I can do, is reframe my thinking, continue to do what I can to live well, & hope for the best. I hope for the best for you as well.