Abstract: Disclosed are compositions and methods for treating a disease or disorder such as cancer in a subject in need thereof. In some aspects, the method comprises administering to the subject a vector comprising a first nucleic acid sequence encoding a promoter operably linked to each of a second nucleic acid sequence encoding a therapeutic polypeptide, and a third nucleic acid sequence encoding a peptide domain that is stabilized when phosphorylated by kinase activity in a target tissue. The kinase activity can be elevated extracellular regulated kinase (ERK) activity.