This is new to me and I am a survivor of rectal cancer. I did have "some" back pain before my tumor was discovered, but this was only after I had been on my feet for long periods. Now, 2 1/2 years later, I have no pain.
Interesting that the medical community has no answers, but....maybe you should get used to that. In 20 years, there will be more answers, for now, we are the "study group."