Gefitinib (ZD1839, Iressa) as palliative treatment in recurrent or metastatic head and neck cancer. - Kirby, A. M.; A'hern, R. P.; D'ambrosio, C.; Tanay, M.; Syrigos, K. N.; Rogers, S. J.; Box, C.; Eccles, S. A.; Nutting, C. M.; Harrington, K. J. (British Journal of Cancer, 2006)