This could be huge
http://www.medicalnewstoday.com/articles/294479.php
http://www.bbc.com/news/health-32901133
http://www.medicalnewstoday.com/articles/294479.php
http://www.bbc.com/news/health-32901133
Researchers from the UK and Denmark have discovered a protein that encourages breast cancer to spread to the bone - a finding that could pave the way for treatments that halt progression of the disease.
...
They found that when breast cancer cells are deprived of oxygen, they release high levels of LOX. This protein makes holes in the bone of breast cancer patients as a way of preparing it for the arrival of cancer cells.