S225: CIRCULATING TUMOR DNA IS A PROGNOSTIC BIOMARKER AT BASELINE AND IMPROVES THE ACCURACY OF INTERIM PET IN CLASSIC HODGKIN LYMPHOMA. (23rd June 2022) - Pirosa, M. C.; Bruscaggin, A.; Terzi di Bergamo, L.; Salehi, M.; Pini, K.; Spina, V.; Bocchetta, S.; Condoluci, A.; Forestieri, G.; Piffaretti, D.; Marques De Almeida, J.; Annunziata, S.; et al.