PO-089: Melatonin enhances the toxicity of radio- and chemotherapy in head and neck cancer cells. (March 2017) - Escames, G.; Fernández-Gil, B.I.; Guerra-Librero, A.; Shen, Y.; García-López, S.; Florido, J.; Sayed, R.; Acuña-Castroviejo, D.; Esposito, J.