Recombinant adeno-associated virus vectors (rAAV) represent a most promising gene delivery vehicles for gene therapy applications because their unique properties, such as capability to infect both proliferating and non proliferating cells of broad host range, and possibilities of long-term expression and site-specific integration. rAAV are also described as vectors neither toxic nor pathogenic to the cells. rAAV vectors are also thought to be attractive for cancer gene therapy. Here, we used rAAV2 vectors encoding reporter genes, rAAV/GFP and rAAV/LacZ to transduce cancer cells. The rAAV preparations were produced by a transient triple AAV plasmid transfection of AAV-293 packaging cells and isolated/purified by iodixanol-gradient method. We report a different rAAV transduction efficiency of the two cancer cell lines cells--ovarian carcinoma (OVP 10) and hepatocellular carcinoma (C3A) cells. The expression of the reporter genes due to rAAV uptake was about two fold higher for ovarian cells than for hepatocellular cells. Our studies have also revealed the long-term expression of GFP gene in hepatocellular (C3A) rAAV/GFP transduced cells. These findings indicate that adeno-associated virus derived vectors could be very useful for cancer gene therapy applications, however, further investigations of the mechanisms of rAAV gene delivery are still needed.