P1350: THE EFFICACY OF UPFRONT HIGH-DOSE CHEMOTHERAPY WITH AUTOLOGOUS STEM CELL TRANSPLANTATION IN DECREASING RELAPSE RATE IN IV STAGE AND HIGH-INTERMEDIATE/HIGH IPI RISK GROUPS DLBCL. (23rd June 2022) - Koviazin, A.; Filatova, L.; Zyuzgin, I.; Artemyeva, A.; Motalkina, M.; Chudinovskikh, Y.; Volchenkov, S.; Poliatskin, I.; Dobrovolskaya, E.; Shalaev, S.; Ishmatova, I.; Zverkova, A.; et al.