Barker, L. M., T. W. Pendergrass, J. E. Sanders and D. S. Hawkins (2005). "Survival after recurrence of Ewing's sarcoma family of tumors." J Clin Oncol 23(19): 4354-4362. 8. Berghuis, D., S. J. Santos, H. J. Baelde, A. H. Taminiau, R. M. Egeler, M. W. Schilham, P. C. Hogendoorn and A. C. Lankester (2011). "Pro-inflammatory chemokine-chemokine receptor interactions within the Ewing sarcoma microenvironment determine CD8(+) T- lymphocyte infiltration and affect tumour progression." J Pathol 223(3): 347-357. 9.