CytomX Therapeutics Inc is an oncology-focused biopharmaceutical company that is operating in the United States. It is engaged in developing antibody therapeutics based on probody technology platforms. The company's probody technology platform creates proprietary cancer immunotherapies against clinically-validated targets and develops cancer therapeutics. Probody therapeutics are designed to take advantage of conditions in the tumor microenvironment to enhance the tumor-targeting features of an antibody and reduce drug activity in healthy tissues.