A method of treating a mammal with a tumor by decreasing intratumoral vessels associated with tumor or inhibiting formation of new intratumoral vessels includes injecting tumor with therapeutically effective amount of expression plasmid including polynucleotide coding for therapeutic peptide consisting of SEQ ID NO: 2 absent any operably linked coding sequence, wherein polynucleotide sequence is operably linked to promoter or expression control sequence, followed by application of electric pulses to site of injection in tumor or injecting muscle of mammal with therapeutically effective amount of expression plasmid including polynucleotide coding for therapeutic peptide consisting of SEQ ID NO: 2 absent any operably linked coding sequence, wherein polynucleotide sequence is operably linked to promoter or expression control sequence, followed by applying electric pulses to site of injection in muscle of mammal, whereby expression of SEQ ID NO: 2 decreases intratumoral vessels associated with tumor, or formation of new intratumoral vessels therein.
