Here is a good review article from the “yellow journal” on metastasis to the spine!
Rose, P., Buchowski, J. (2011). Metastatic Disease in the Thoracic and Lumbar Spine American Academy of Orthopaedic Surgeon 19(1), 37-48. https://dx.doi.org/10.5435/00124635-201101000-00005
Download PDF from the rochester.edu website
As a complement to this article, I found a good video lecture on this topic by Dr. Laurence Rhinnes from MD Anderson.
Spine 101 