Cytotoxicity on U-87 MG cells treated by (a) doxorubicin with U-87 MG cell derived exosome, (b) doxorubicin with bEND.3 cell derived exosome, (c) paclitaxel with U-87 MG cell derived exosome, and (d) paclitaxel with bEND.3 cell derived exosome (1: 25 μM drug; 2. 100 μg/ml exosome; 3. 200 μg/ml exosome; 4. drug + 20 μg/ml exosome; 5. drug + 40 μg/ml exosome; 6. drug + 80 μg/ml exosome; 7. drug + 100 μg/ml exosome; 8. drug + 200 μg/ml exosome, * Results are significantly different, p<0.05).