ASSESSMENT OF THE EXTERNAL VALIDITY OF THE NCCN GUIDELINES FOR PANCREATIC DUCTAL ADENOCARCINOMA (PDAC) IN A REAL POPULATION OF ELDERLY PATIENTS AGED 70 YEARS AND OLDER. (November 2019) - Rodriquenz, M.; Najar, J.Negrete; Sehovic, M.; Battisti, N.; Extermann, M.