The AVP peptide was measured by radioimmunoassay in other blood vessels23, e.g. radial and mammary artery and saphenous vein samples, and the immunoactivity was shown to co-migrate with synthetic AVP on HPLC analysis. The levels of hormone ranged from undetectable to as high as 60 uU/gr tissue. Thus, we will also be able to verify changes in VP gene expression by measuring the AVP protein directly in the ovarian neoplasm blood vessels collected.