<prompt> Van nuys prognostic index is not based on:AgeMicrocalcificationSizeER status  <response>: The Van Nuys Prognostic Index is based on size grade of DCIS, margins and age of patient. Van Nuys Prognostic Index Parameter Score 1 Score 2 Score 3 Van Nuys Classification Group 1 Group 2 Group 3 Non high nuclear grade without necrosis Non High nuclear grade with necrosis High nuclear grade with or without necrosis Margins 10 mm 1-9 mm 1 mm Size 15 mm 16-40 mm 40 mm Age 60 40-60 40 REF : BAEILY AND LOVE 27TH ED 