The Global Spine Tumour Study Group (GSTSG): an international group of spinal surgeons who are dedicated to studying the outcomes of surgery for spinal tumours 1).

1)
Mazel C, Balabaud L, Bennis S, Hansen S. Cervical and thoracic spine tumor management: surgical indications, techniques, and outcomes. Orthop Clin North Am. 2009 Jan;40(1):75-92, vi-vii. doi: 10.1016/j.ocl.2008.09.008. Review. PubMed PMID: 19064057.