ELEVATED CA 19-9 IN AN ASYMPTOMATIC PATIENT: WHAT DOES IT MEAN? - Meira Júnior, José Donizeti de; Costa, Thiago Nogueira; Montagnini, Andre Luis; Nahas, Sergio Carlos; Jukemura, José (Abcd-arquivos brasileiros de cirurgia digestiva-brazilian archives of digestive surgery, 2022)