EGFR and non-small cell lung carcinoma: Methods: One glioblastoma (U-87 MG) and four NSCLC (erlotinib-sensitive HCC827, erlotinib-resistant HCC827, gefitinib-resistant HCC827, and erlotinib-resistant HCC827 with a secondary EGFR mutation) cell lines were incubated with 11C-erlotinib up to 60 min.