Erlotinib Withdrawn Phase 1 / 2 Trials for Stage III Squamous Cell Carcinoma of the Lip and Oral Cavity / Recurrent Skin Cancer / Stage IVA Squamous Cell Carcinoma of the Lip and Oral Cavity / Squamous Cell Carcinoma of the Skin / Stage IVB Squamous Cell Carcinoma of the Lip and Oral Cavity / Recurrent Squamous Cell Carcinoma of the Lip and Oral Cavity Treatment