Fig. 2

The IC50s of SNK-6, SNK-6/ADM and SNK-6/ADM-SP cells were separately treated with the five well-known chemotherapy drugs. a–e The drug response curves to various drugs and drug concentrations. f The upward trend of IC50s among the three cell lines is obvious in the groups of doxorubicin, cytarabine and cisplatin, but the difference almost can be neglected in the group of gemcitabine and l-asparaginasum. *P < 0.05 compared with SNK-6 cells