Table 1.

GI lymphoma classification adopted at the Consensus Conference in Lugano.

Stage I Tumor confined to gastrointestinal tract, single primary site, and multiple noncontiguous lesions.

Stage II Tumor extends into the abdominal cavity from the primary gastrointestinal site.

II1 Local nodal involvement

II2 Distant nodal involvement

Stage III Penetration through serosa to involve adjacent organs or tissues

Stage IV Disseminated extranodal involvement or a gastrointestinal tract lesion with supradiaphragmatic nodal involvement