Anatomical substages of stage III Hodgkin's disease: implications for staging, therapy, and experimental design.

Twenty-three patients with pathologic stage III Hodgkin's disease were classified with respect to the presence or absence of symptoms (III-A, III-B), the presence or absence of splenic involvement (IIIS+, IIIS-) and anatomic substage--the extent of disease within the abdomen (III1, III2). Stage III1 disease included disease limited to the upper abdomen, i.e., spleen, splenic node, celiac node, and/or portal node. All other more extensive disease was classified as stage III2. Symptoms and splenic involvement did not predict either disease-free survival or survival. However, 5 year actuarial disease-free survival was significantly better in III1 patients as compared to III2 patients (77% vs. 13%, p less than .001). Eight of nine stage III2 patients receiving total nodal radiotherapy alone relapsed. When considered along the previous studies of anatomic substage, these findings suggest that patients in stage III1 and III2 should receive different therapeutic approaches. Analysis of therapeutic results in stage III patients must consider anatomic substage.