five murine tumor cells ( sarcoma 1509a , gc-4 , yac-1 , dunn osteosarcoma , lewis lung carcinoma ) were exposed to methotrexate ( mtx ) at concentrations of 10 ( -1 ) -10 ( -9 ) mg/ml for 4-72 hours in vitro and then assayed for their viability .
C0029463
osteosarcoma
C0025677
methotrexate