The present invention provides polymeric pegylated carfilzomib compounds, and pharmaceutically acceptable salts thereof, of Formula I wherein R1, R2, linker, PEG, n and o are as defined herein. The invention also provides methods of making and using these compounds to treat cancer, and particularly to treat hematological malignancies including multiple myeloma.本發明提供式I之聚合物聚乙二醇化卡非佐米化合物,及其醫藥學上可接受之鹽其中R1、R2、連接體、PEG、n及o如本文所定義。本發明亦提供製備及使用此等化合物來治療癌症且特定言之治療包括多發性骨髓瘤在內之血液學惡性腫瘤之方法。