the prospective study conducted by the organisation internationale d'etudes statistiques pour les maladies de l'oesophage ( oeso ) ( international organization for statistical studies of esophageal diseases ) created in 1979 concerns 790 patients operated on for a tumor of the esophagus or the mouth of the esophagus .
C0014859
tumor of the esophagus
C0014876
esophagus