When cancer spreads to the bone, one of the most likely sources is cancer that has already appeared in the breast, according to WebMD. Other cancers that commonly metastasize to the bones include kidney, thyroid, lung and prostate.
Altogether, about 75 percent of instances of cancer metastasizing to the bones come from those five sources, and about 70 percent of people with advanced prostate or breast cancer end up developing bone cancer as well. In fact, the bones are frequently the first place to which the cancers spread. Because bones feature constant growth and turnover of cells, they are a hospitable breeding ground for cancer to spread. It's possible that cancer cells attach more effectively to bone than other substances, but more research is necessary to establish that as of 2015, as stated by WebMD.