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
As a complement to this article, I found a good video lecture on this topic by Dr. Laurence Rhines from MD Anderson — see the "Spinal Metastasis – Evaluation and Treatment" post on this blog.