PROBLEM TO BE SOLVED: To provide SNS-595 and a method for maximizing the therapeutic potential of SNS-595 in a cancer treatment.SOLUTION: The method is provided for deciding whether the possibility that a cancer to be treated responds to a SNS-595 treatment is high, and also whether the possibility that the cancer responds to the SNS-595 treatment is high when the treatment is advanced. The method includes deciding the initial amount of at least one constitutive protein of a DNA-PK route in a cancer cell to be treated, and comparing the initial amount with a second amount thereof.【課題】ＳＮＳ－５９５、及びガン治療におけるＳＮＳ－５９５の治療可能性を最大限にする方法の提供。【解決手段】治療すべきガンがＳＮＳ－５９５治療に応答する可能性が高いかどうか、並びに該治療を進めた場合に、該ガンがＳＮＳ－５９５治療に応答する可能性が高いかどうかを決定する方法、および、該方法は、治療すべきガンの細胞中のＤＮＡ－ＰＫ経路の少なくとも１つの構成タンパク質の始めの量を決定すること、及び始めの量と２回目の量とを比較することを含む治療方法。【選択図】なし
