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582 A Randomized Phase 2, Investigator-Led Trial of Glofitamab-R-CHOP or Glofitamab-Polatuzumab Vedotin-R-CHP (COALITION) in Younger Patients with High Burden, High-Risk Large B-Cell Lymphoma Demonstrates Safety, Uncompromised Chemotherapy Intensity, a High Rate of Durable Remissions, and Unique FDG-PET Response Characteristics

Program: Oral and Poster Abstracts
Type: Oral
Session: 627. Aggressive Lymphomas: Pharmacologic Therapies: New R-CHOP Combinations for Treatment Naïve DLBCL
Hematology Disease Topics & Pathways:
Research, Clinical trials, Adult, Lymphomas, Non-Hodgkin lymphoma, Clinical Research, Diseases, Aggressive lymphoma, Lymphoid Malignancies, Technology and Procedures, Study Population, Human, Imaging, Measurable Residual Disease , Molecular testing
Sunday, December 8, 2024: 1:15 PM

Adrian Minson, MBBS1,2, Emma Verner, MBBS3*, Pratyush Giri, MBBS4*, Jason Butler, MBBS5*, Wojt Janowski, MD6*, Chan Y. Cheah, MBBS, DMSc7*, Sumita Ratnasingam, MBBS8, Shu Min Wong, MBBS9*, Matthew Ku, MBBS, PhD10*, Mark S. Hertzberg, MBBS11, Kirsten Herbert, MBBS, PhD12*, Nada Hamad, MBBS, MSc, BSc13, Costas K. Yannakou, MBBS, PhD14*, Fiona Swain15*, Paul Neeson, PhD16*, Thiago M. Steiner, PhD16*, Javad Saghebi, MBBS16*, Piers Blombery, MBBS1,17, Molly Robertson, RN16*, Lei Shong Lau, PhD16*, Jing Xie, PhD16*, Rory Bennett, MBChB2*, John F. Seymour, MBBS, PhD1,18 and Michael J. Dickinson, MBBS, DMedSci1,2

1Sir Peter MacCallum Department of Oncology, University of Melbourne, Parkville, VIC, Australia
2Peter MacCallum Cancer Centre & Royal Melbourne Hospital, Melbourne, VIC, Australia
3Concord Repatriation General Hospital, Concord, NSW, Australia
4Royal Adelaide Hospital, Adelaide, Australia
5Department of Haematology and Bone Marrow Transplant, Royal Brisbane and Women's Hospital, Brisbane, QLD, Australia
6Calvary Mater Newcastle, Newcastle, NSW, Australia
7Sir Charles Gairdner Hospital and the University of Western Australia, Nedlands, Australia
8University Hospital, Geelong, Australia
9Alfred Hospital, Melbourne, Australia
10St Vincent’s Hospital, Melbourne, VIC, Australia
11Prince of Wales Hospital, Sydney, NSW, Australia
12Cabrini Health, Melbourne, VIC, Australia
13St Vincent's Hospital, Sydney, NSW, Australia
14Molecular Oncology and Cancer Immunology, Epworth HealthCare, Melbourne, VIC, Australia
15Department of Haematology, Princess Alexandra Hospital, Woolloongabba, Australia
16Peter MacCallum Cancer Centre, Melbourne, VIC, Australia
17Peter Maccallum Cancer Centre, East Melbourne, VIC, Australia
18Department of Clinical Haematology, Peter MacCallum Cancer Centre and Royal Melbourne Hospital, Melbourne, VIC, Australia

Background:

Patients (pts) with high-risk (HR), IPI≥3/NCCN-IPI≥4 large B-cell lymphoma (LBCL) treated with R-CHOP have 1-yr PFS<75% and <50% are cured. They are underrepresented in trials partly due to the demands of screening when rapid treatment is needed. Previous studies adding novel drugs to R-CHOP often increased toxicity and reduced chemotherapy delivery intensity without improving outcomes. Polatuzumab-R-CHP, in contrast, improves PFS over R-CHOP in pts with IPI≥2 (Tilly, NEJM 2022), but the rate of relapse in HR pts remains an area of need. For fit younger HR pts many centers use intensified chemotherapy (e.g. DA-EPOCH-R) despite added toxicity, cost, and uncertain benefit. Glofitamab, a CD20xCD3 bispecific antibody, is approved in relapsed/refractory LBCL. In a multi-center investigator-led trial designed to address this need, we evaluated the safety and efficacy of glofit-R-CHOP and glofit-pola-R-CHP in younger pts with HR LBCL.

Methods:

Pts aged 18-65 yrs with untreated LBCL and ≥1 HR feature were enrolled prior to or after one cycle of R-CHOP. HR was defined as IPI ≥3, NCCN-IPI ≥4, or proven HGBL with MYC and BCL2 and/or BCL6 rearrangements (HGBL-DH). ECOG <4 at baseline or <2 at cycle 2 was permitted. All pts received 1 cycle of R-CHOP (C1) and were randomized to receive 5 cycles of glofit (2.5 mg & 10 mg step-up in C2, 30 mg in C3-6) with either R-CHOP (Arm A) or pola-R-CHP (Arm B), followed by 2 cycles of glofit (C7-8).

Primary endpoints were safety and deliverability, measured by relative dose intensity (RDI) and rate of early discontinuation. Secondary endpoints included ORR, CRR, PFS, OS. Responses were evaluated per Lugano 2014 by FDG-PET after cycles 2, 4 and 6 and then every 3-6 months. Adverse events (AEs) were CTCAE V5.0 graded, except CRS and ICANS (ASTCT). Exploratory endpoints included PET parameters, genomic profiling and MRD monitoring by cell free DNA (cfDNA).

Results:

80 pts were enrolled and completed end of induction (EOI) at the 15 Feb 2024 data cut-off, with median follow up (FU) of 14.6 months. Baseline pt characteristics were similar between the arms. In total, 71 (89%) pts had de novo DLBCL/HGBL, 9 (11%) had transformed indolent lymphoma; 30/80 (38%) were non-GCB subtype. Median age was 58 years (range, 24-65), and the median time from diagnosis to first dose of R-CHOP was 14 days (IQR 8-20). HR features were: IPI ≥3 in 83%, NCCN-IPI ≥4 in 85%, and HGBL-DH in 11%. 97% had stage III-IV disease. The median metabolic tumour volume was 842 cm3 (IQR 408-1342 cm3).

Gr≥3 AEs occurred in 22/40 (55%) in each arm, including 1 Gr 5 AE each (cardiomyopathy and AML). In Arm A and B, febrile neutropenia was observed in 0/40 (0%) and 6/40 (15%) and CRS Gr 1 in 7/40 (18%) and 8/40 (20%), respectively. One episode of Gr 2 CRS was reported in each Arm and no Gr 3-5 CRS. Peripheral neuropathy was limited to Gr 1-2: 18/40 (45%) Arm A and 17/40 (42%) Arm B. No ICANS was reported.

For > 90% of pts, the RDI was ≥90% for all individual components except vincristine (78%). There were 2 dose interruptions of doxorubicin (AMI [n=1], and poor performance status [n=1]), and 5 interruptions of glofit, (infection [n=3], hepatotoxicity [n=1], and rash [n=1]). One pt ceased treatment after 5 cycles and remains in CMR at 13 months FU.

Best overall response (BOR) rate was 100% (CMR/PMR 92%/8%). At EOI, rates of CMR/PMR were 70%/29% in Arm A, and 80%/18% in Arm B. There were 6 PFS events: in Arm A, 3 PD and 1 death in remission (cardiomyopathy) and in Arm B, 1 PD and 1 death in remission (AML). BOR in pts with PD were PMR in 2 and CMR in 2 (time from first CMR to PD of 5 and 11 months).

The PFS/OS at 12 months is 88%/96% in Arm A and 95%/97% in Arm B. Of the 18 pts in PMR at EOI, none has progressed, while 14 converted to CMR. Given this finding, analysis of cfDNA was performed (KAPA NHL; Roche Dx) and 80% (8/10) of pts with available samples were negative for MRD at EOI in the context of PMR. Genomic evaluation and extended clinical follow up will be reported at the meeting.

Conclusion:

Glofit-R-CHOP or glofit-pola-R-CHP each resulted in high rates of deep and durable responses in a very high disease burden, HR pt population. The study design enabled rapid treatment initiation, minimal new toxicity, and uncompromised chemotherapy delivery intensity. With these regimens, PMR at EOI does not necessarily represent treatment failure, and cfDNA may be useful to further investigate outcomes in this setting. CRR and preliminary PFS is promising compared to historical outcomes in pts with HR LBCL.

Disclosures: Minson: Novartis: Honoraria, Other: Travel Funding, Research Funding; Loxo: Research Funding; Lilly: Research Funding; Genmab: Research Funding; AbbVie: Honoraria, Research Funding; Roche: Honoraria, Research Funding. Verner: Janssen Cilag Pty Ltd: Research Funding. Giri: Royal Adelaide Hospital: Current Employment. Janowski: Janssen, Pfizer, Beigene: Consultancy. Cheah: Roche: Other: Travel Expenses; Roche, Janssen, MSD, Gilead, Ascentage Pharma, AstraZeneca, Lilly, TG Therapeutics, BeiGene, Novartis, BMS: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees; BMS, Roche, AbbVie: Research Funding. Ku: St Vincent's Hospital, Melbourne: Current Employment; F. Hoffmann-La Roche Ltd, AbbVie: Consultancy; Roche, Abbvie: Consultancy; Beigene: Research Funding. Hertzberg: Roche/Genentech, Janssen: Research Funding; Roche, Takeda, Janssen, Pfizer, Gilead: Honoraria; Roche, Takeda, AbbVie: Membership on an entity's Board of Directors or advisory committees. Swain: Limbic: Honoraria; Gilead: Honoraria. Seymour: BMS: Honoraria, Research Funding, Speakers Bureau; AbbVie: Honoraria, Research Funding, Speakers Bureau; TG Therapeutics: Consultancy; Genor Bio: Consultancy; Roche: Honoraria, Research Funding, Speakers Bureau; Gilead: Honoraria; Janssen: Honoraria; AstraZeneca: Honoraria, Speakers Bureau; Beigene: Honoraria. Dickinson: Novartis: Consultancy, Honoraria, Speakers Bureau; Gilead: Consultancy, Honoraria, Speakers Bureau; Roche: Consultancy, Honoraria, Speakers Bureau; Kite: Consultancy, Honoraria, Speakers Bureau; Adicet Bio: Consultancy, Honoraria; Genmab: Consultancy, Honoraria, Speakers Bureau.

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