The daytime and nighttime dispositions of high dose (12 g/m 2 ) methotrexate were examined in 8 osteosarcoma patients. The plasma and renal clearances, urine pH values and area under the curves were compared. The plasma clearance of methotrexate tended to fall after it was administered at (from 1.74±0.06 ml/min/kg to 0.47±0.01 ml/min/kg, p

The daytime and nighttime dispositions of high dose (12 g/m 2 ) methotrexate were examined in 8 osteosarcoma patients. The plasma and renal clearances, urine pH values and area under the curves were compared. The plasma clearance of methotrexate tended to fall after it was administered at (from 1.74±0.06 ml/min/kg to 0.47±0.01 ml/min/kg, p