We found that unconjugated WP936 did not show cytotoxic activity in U-251 (Figure 6(ai)); express IL-13RA2, EphA2, EphA3, and little EphB2), BTCOE 4795 (Figure 6(aii)); express IL-13RA2, EphA2, and no EphB2), and T98G (Figure 6(aiii)); express EphA2, but not IL-13RA2 or EphB2) ([12] and data not shown) GBM cells when the cells were exposed to concentrations of up to 100 nM of the drug. The gene discussed is EPHA2; the disease is glioblastoma.