Can the SUV-based interpretation improve prognostic accuracy of interim and posttreatment F-FDG PET/CT in patients with diffuse large B-cell lymphoma?

In order to investigate whether the SUV-based interpretation could improve prognostic accuracy of interim (PET-4) and posttreatment PET/CT (PET-end), 115 patients with newly diagnosed DLBCL were recruited in the study. ROC analysis revealed the optimal threshold is 1.6-fold of SUV for PET-4 and 1.4-fold of SUV for PET-end. The SUV-based interpretation had a perfect interobserver agreement, higher prognostic accuracy and positive predictive value than 5-point scale and %ΔSUV criteria in both PET-4 and PET-end. Dramatic differences in the outcome between patients with positive and negative PET-4/PET-end were demonstrated using Kaplan-Meier survival curves (p < .05). Univariate and multifactor analysis found PET-4 and PET-end were independent prognostic factors for the outcome of DLBCL. In conclusion, the SUV-based interpretation were superior to 5-point scale and %ΔSUV criteria in analyzing the PET-4 and PET-end for the prognosis of DLBCL patients.