The present disclosure relates to methods or dosing regimens comprising a proteasome inhibitor of formula (I), or a pharmaceutically acceptable salt thereof, for treating cancer, or preventing cancer recurrence or progression; wherein ring A, Z1 and Z2 are as defined herein.本發明係關於包含式(I)之蛋白酶體抑制劑或其醫藥學上可接受之鹽於治療癌症或預防癌症復發或惡化的方法或給藥方案,其中環A、Z1及Z2如本文中所定義。