Human prostate tumor cell lines PC-3 and DU-145, and a mouse prostate tumor cell line TRAMP-C2 were obtained from ATCC (Manassas, VA). PC-3-luc cell line was kindly provided by Kenneth Pienta (University of Michigan, Ann Arbor, MI). All prostate tumor cell lines were maintained in RPMI-1640 media containing 10% fetal calf serum. To create Ad.dcn, the decorin gene was cloned in a shuttle vector and subjected to homologous recombination with adenoviral genomic DNA derived from adenoviral mutant dl01/07, using published methods.41 (link) To create Ad(E1-).dcn, an AdEasy system was used for homologous recombination.42 (link) Ad(E1-).null (the non-replicating adenovirus without any foreign trangene), Ad(E1-).luc (the non-replicating adenovirus containing firefly luciferase2 gene), and Ad.luc (the conditionally replicating adenovirus containing firefly luciferase2 gene) have been previously described.33 (link), 43 (link), 44 (link) All adenoviral vectors were amplified in HEK293 cells (ATCC), and purified as described earlier.43 (link)