Results of the Phase II of Epirchop Study, Evaluating the Efficacy of Tazemetostat in Combination with R-CHOP in Elderly Newly Diagnosed Diffuse Large B Cell Lymphoma (DLBCL): A Lysa Study

• Published in: Blood 2023-11, Vol.142 (Supplement 1), p.853-853
• Main Authors: Sarkozy, Clementine, Molina, Thierry Jo, Houot, Roch, Dubois, Sydney, Pica, Gian Matteo, Ruminy, Philippe, Herbaux, Charles, Gastinne, Thomas, Haioun, Corinne, Guidez, Stephanie, Bonnet, Christophe, Andre, Marc, Vereseza, Liana, Sylvain, Choquet, Ysebaert, Loic, Bachy, Emmanuel, Jardin, Fabrice, Morschhauser, Franck, Ribrag, Vincent
• Format: Article
• Language: English
• ISSN: 0006-4971; 1528-0020
• DOI: 10.1182/blood-2023-174607

Introduction: Tazemetostat (TAZ) is a selective oral EZH2 inhibitor with a favorable safety profile and activity in pts with either EZH2wild type or mutant B-cell NHL. In the phase I part of Epi-RCHOP study, we reported that R-CHOP plus TAZ (Taz-RCHOP) was well tolerated with safety and PK results comparable to R-CHOP alone, and the RP2D of TAZ in combination with RCHOP was consistent with TAZ monotherapy (800mg BID). We report here the efficacy results of the phase II TAZ R-CHOP study (Epi-RCHOP, NCT02889523), in pts 60-80y with newly diagnosed DLBCL. Methods: Pts received 6 R-CHOP every 21 days in combination with continuous TAZ at 800 mg BID, plus 2 cycles of TAZ and R (cycle 7 and 8). Prophylaxis with G-CSF, valaciclovir and trimethoprim sulfamethoxazole were strongly recommended. Primary endpoint was PET-based complete metabolic response rate (CR, Lugano 2014) at end of study treatment (EOT, i.e 8 cycles or at time of permanent treatment discontinuation) (data cut-off was January 30, 2023). Sample size calculation was made with the expectation of an increase of 10% in CR, with an H0 hypothesis of 70% and an H1 assumption of 80%, leading to a theorical sample size of 122 pts, assuming a drop out of 5%. The efficacy set correspond to pts who signed an informed consent and received at least one dose of TAZ. Pts without response assessment (no matter the reason) were considered non-responders. Key secondary objectives were progression free and overall survival. A sensitivity analysis was performed excluding pts who withdrawn their consent (N=112). Analyses were conducted using SAS® version 9.3. Results: From July 31, 2020 to July 18, 2022, 122 pts were enrolled in 27 LYSA centers. Median age was 70 years (60-80), 57% were female, 12% had an ECOG-PS2+, 70.5% a stage IV disease and 19.7% stage III, 66% elevated LDH, 73.8% an IPI of 3-5. Mutational profile was available for 76 pts, of whom 10 (13%) had an EZH2 mutations and 26 (34%) and EZB profile as assessed with LymphGen classifier. One hundred pts (82%) received 8 cycles and 22 had a premature treatment discontinuation (PTD), 12 (9.8%) during the first 2 cycles and 10 (8.2%) between cycle 3 and 8. Reasons for PTD were: consent withdrawal (N=10, including 7 during cycle 1 & 2), adverse events (AE, N=6, including 2 treatment related), death (N=2, both due to septic shock), protocol deviation (N=2), progressive disease (N=1) or physician decision (N=1). Overall, the median percentage of TAZ dose received wa