Thank you guys, some of you are right and jp255 is correct. As I talked about "oncogenic p53" it means I did mutagenesis to create my construct. In vitro, I have seen my p53 enhancing tumorigenesis of of my cell lines, so I already know what it is capable of. My real question was: what´s the likelihood this lentiviral vector survives the stomach pH. CharonY mentioned it is low but I haven´t been able to find any information on the literature about this. There are excellent reviews about oncogenes and tumor suppressor genes on PubMed if you are looking for deep knowledge about cancer.