Methods and diagnostic agents for identification of subjects for cancer treatment with an anti-hyaluronan agent, such as a hyaluronan-degrading enzyme, are provided. Diagnostic agents for the detection and quantification of hyaluronan in a biological sample and monitoring cancer treatment with an anti-hyaluronan agent, for example a hyaluronan-degrading enzyme, are provided. Combinations and kits for use in practicing the methods also are provided.
