Tumor interstitial fluid of mice with altered cathepsin B expression were analyzed.
High content of protease and protease inhibitors was observed.
Abundant shed ectodomains highlights the proteolysis in tumor–stroma interaction.
Cathepsin B acts on the abundance of alpha-1B-glycoprotein and MUP 11 and 8.
Interstitial fluid is a primary source for the anaylsis of cancer secretomes.