Conventional chemotherapeutics are currently being used in conjunction with radiation therapy to increase its effectiveness. Examples include the fluoropyrimidines, gemcitabine and platinum analogs; fluoropyrimidines increase sensitivity by dysregulating S-phase cell cycle checkpoints in tumor cells. Gemcitabine progresses through a similar mechanism, causing cells in the S-phase to disrepair DNA damage caused by the radiation. Platinum analogs such as cisplatin inhibit DNA repair by cross linking strands, and so aggravate the effects of DNA damage induced by radiation.
Radiosensitizer
Irradiation
Immunologic adjuvant
Immunostimulant
Mitogen
Sterilization 
Radiation
Neuroenhancement