Evaluation of candidate promoters for transcriptional targeting of breast cancer cell lines. Luciferase activities in breast cancer cell lines (MB-468, AU-565, GI-101 and MB-231). These cell lines were infected with AdCXCR4Luc, AdSurvivinLuc, AdCox2MLuc, AdSLPILuc, AdEGP-2Luc and AdCMVLuc, respectively, at a multiplicity of infection of 100. Gene expression was measured 24 h after infection and is presented for the candidate promoters as percentage of cytomegalovirus promoter activity in relative light units (RLU). Each bar presents the mean of three experiments (± standard deviation).