Adenocarcinoma, MucinousAdenocarcinomaAppendiceal NeoplasmsCarcinoma, Signet Ring CellColorectal NeoplasmsPseudomyxoma PeritoneiRectal FistulaCecal NeoplasmsCystadenoma, MucinousUrachal CystCalymmatobacteriumPerineumCystadenocarcinoma, MucinousMucin-2MucinsNeoplasm StagingColonic NeoplasmsStomach NeoplasmsRectal NeoplasmsTumor Markers, BiologicalOvarian NeoplasmsImmunohistochemistryPrognosisMicrosatellite Instability