Described herein are methods of treating a proliferative disease in a subject by administering a DNA-damaging agent and between about 8 and about 48 hours later administering to the subject a DNA-PK inhibitor. Exemplary DNA-PK inhibitors are represented by Formula (B-I): and by pharmaceutically acceptable salts thereof, wherein R1, Q, Ring A, and Ring B are as defined herein.本文闡述治療個體之增殖性疾病之方法,其係藉由投與DNA破壞劑且在之後約8小時與約48小時之間向該個體投與DNA-PK抑制劑來實施。例示性DNA-PK抑制劑係由式(B-I)表示:及其醫藥上可接受之鹽,其中R1、Q、環A及環B係如本文所定義。