Prognostic Significance of Tumor Volume and Patient Weight. 1A. Recursive partitioning algorithm utilizing the following variables as potential prognostic factors for EFS: age, stage, group, T-stage, nodal status, histology, primary site, maximum tumor diameter, tumor volume, patient height, patient weight, patient body surface area, and treatment regimens. 1B. EFS Kaplan-Meier curves for risk groups identified by the recursive partitioning.