We incorporated a dFdC-sensitive and a dFdC-resistant human nonsmall cell lung carcinoma (NSCLC) cell line (SWp and SWg respectively, van Bree et al, 2002) to show that these CPEC-induced effects can also be obtained in other human solid tumour cell lines and requires the presence of dCK activity. The gene discussed is DCK; the disease is non-small cell lung carcinoma.