Lewis CM, Glisson BS, Feng L, Wan F, Tang X, Wistuba II, El-Naggar AK, Rosenthal DI, Chambers MS, Lustig RA, Weber RS. A phase II study of gefitinib for aggressive cutaneous squamous cell carcinoma of the head and neck. Clin Cancer Res. 2012 Mar 01;18(5):1435–46. PMID: 22261807; PMCID: PMC6167936.