<qa>  What is the drug that kills tumor cells?Pemetrexed is a drug that kills tumor cells by stopping cells from functioning normally. It has been studied in thousands of subjects and has been shown to be effective at killing tumor cells in many cancers, including head and neck cancer. In preclinical studies, Pemetrexed showed such promising activity against a wide range of tumor types including those mentioned above as well as breast, colon, and bladder cancers. 