(A,B) Survival curves showing a significant (p<0.05, log-rank test) decrease in median survival for GSC tumor bearing mice which were pre-treated with matched GA-hMSC-derived exosomes prior to implantation. Median survial was 45 days for GSC-262 (A) and 37 days for GSC-20 (B). (C,D) H&E staining of mice brain tumor sections demonstrating a significant (p<0.05, paired t-test) increase in tumor volume at 40 days. Arrows indicate tumor location. CM-conditioned media, ED-CM-exosome depleted-conditioned media.