Dear Jude,
I do not know if the joint pain can cause cancer, but am hoping that it does not. I have an 11 year old w/CML who was diagnosed Sept. of 2005. She, at this moment, is still in what her docs call "remission". Anyway, she has had joint pain, mainly in her legs for the past year. It is not constant, but seems to come more often thses days. I wish you the best. I am always praying for a cure and those w/CML.
Cindy