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Treatment with covalent Bruton tyrosine kinase inhibitors (BTKi) represents an important advance in the management of relapsed or refractory mantle cell lymphoma, but these treatments are not curative and many patients ultimately relapse. Pirtobrutinib, a highly selective, non covalent (reversible) BTKi, inhibits both wild type and C481-mutant BTK with equal low nM potency, and has favorable oral pharmacology that enables continuous BTK inhibition throughout the dosing interval regardless of intrinsic rate of BTK turnover. Pirtobrutinib is well tolerated and has demonstrated promising efficacy in patients with poor prognosis B-cell malignancies following prior therapy, including covalent BTKi. This phase III, head-to-head, randomized study (NCT04662255) will evaluate whether pirtobrutinib is superior to investigator's choice of covalent BTKi in patients with previously treated, BTKi-naive mantle cell lymphoma.MCL is an uncommon type of B-cell non-Hodgkin lymphoma, a cancer of the immune system. It starts in the part of the lymph node called the mantle zone, where unusual B cells gather and crowd out healthy B cells in the lymph nodes, spleen, bone marrow and/or other organs. MCL can be caused by inappropriate cell signaling. BTK has been identified as a key driver of unusual cell signaling and blocking BTK has been shown to help kill the cancer cells. Covalent (not reversible) BTK inhibitors have advanced the treatment of MCL, but the effectiveness of these treatments is limited by side effects and treatment resistance. Pirtobrutinib, a non covalent (reversible) BTK inhibitor, has been shown to have manageable side effects and to be effective in patients with MCL following previous treatment, including treatment with covalent BTK inhibitors. The BRUIN MCL-321 study compares pirtobrutinib with three currently approved covalent BTK inhibitors (ibrutinib, acalabrutinib or zanubrutinib), in patients with MCL who have never received any form of BTK inhibitor. This trial will look at how many people live with the disease without it getting worse. Like other cancer treatments, pirtobrutinib may affect both healthy cells and tumor cells, which can result in side effects that will also be looked at in this study. This study is active and currently recruiting new patients who have received at least one previous therapy for MCL and have never been treated with a BTK inhibitor.

Covalent Bruton's Tyrosine Kinase (BTK) inhibitors (BTKi) have transformed the management of relapsed mantle cell lymphoma (MCL), but many patients will require additional treatment. Pirtobrutinib is a highly selective, non-covalent (reversible) BTKi that inhibits both wild type and C481-mutated BTK with equal low nM potency.Determine whether pirtobrutinib is superior to investigator's choice of covalent BTKi in patients with previously treated, BTKi-naïve MCL.BRUIN MCL-321 is a randomized, open-label, global phase 3 study comparing pirtobrutinib monotherapy versus investigator's choice of covalent BTKi monotherapy (ibrutinib, acalabrutinib, or zanubrutinib) in patients with previously treated, BTKi-naïve MCL. Approximately 500 patients will be randomized 1:1. Randomization will be stratified by sMIPI risk (low/intermediate vs high), comparator BTKi (ibrutinib vs acalabrutinib/zanubrutinib), and number of prior lines of therapy (1 vs ≥ 2).Global; community hospitals, academic medical centers.Eligible patients are adults aged ≥18 years with a confirmed diagnosis of MCL who received ≥ 1 prior line of systemic therapy for MCL that did not include a prior BTKi. Patients must have measurable disease per Lugano criteria and must have progressed on or relapsed following the most recent line of therapy prior to study enrollment. Key exclusion criteria include a history of current or prior CNS involvement, significant cardiovascular disease, stroke, or intracranial hemorrhage within 6 months of randomization, and allogeneic stem cell transplant (SCT), autologous SCT or chimeric antigen receptor (CAR) T-cell therapy within 60 days of randomization.Pirtobrutinib monotherapy versus investigator's choice of covalent BTKi monotherapy.The primary endpoint is progression-free survival (PFS) per Lugano criteria assessed by an independent review committee, with the goal of demonstrating the superiority of pirtobrutinib over the investigator's choice of covalent BTKi. Secondary endpoints include overall response rate, duration of response, investigator-assessed PFS per Lugano criteria, overall survival, event-free survival, time to treatment failure, time to next treatment, PFS2 (time from randomization to disease progression on next line of treatment or death from any cause), safety and tolerability, and patient-reported outcomes. This global study is currently enrolling patients (NCT04662255).Trial in Progress.Trial in Progress.

TPS7591 Background: Patients (pts) with refractory or relapsed (R/R) diffuse large B-cell lymphoma (DLBCL) have poor outcomes with standard treatment. Loncastuximab tesirine (loncastuximab tesirine-lpyl; Lonca), an antibody-drug conjugate (ADC) comprising a humanized anti-CD19 monoclonal antibody conjugated to a pyrrolobenzodiazepine dimer toxin, is approved in R/R DLBCL based on data from the phase 2 LOTIS-2 trial (Caimi et al. Lancet Oncol 2021). Rituximab (R) is part of standard immunochemotherapy for DLBCL, both as frontline therapy and in subsequent treatments. Preclinical evidence suggests that the addition of rituximab to anti-CD19 ADC therapy may result in prolonged tumor control (Ryan et al. Blood 2017). LOTIS-5 aims to evaluate Lonca-R vs. standard immunochemotherapy of R + gemcitabine + oxaliplatin (R-GemOx) in pts with R/R DLBCL. Methods: This is a phase 3 randomized open-label, two-part, two-arm multicenter study of Lonca-R in pts with R/R DLBCL (NCT04384484). A review of safety data from the nonrandomized safety run-in (Part 1), comparing the safety of Lonca-R to previous Lonca safety data, was completed in January 2022. The trial is now continuing to the randomized phase (Part 2). In Part 2, approximately 330 pts will be randomized 1:1 to receive Lonca-R or R-GemOx. The primary objective of the study is to evaluate the efficacy of Lonca-R versus R-GemOx. The primary endpoint is progression-free survival by independent central review (ICR). Secondary endpoints include overall survival, overall response rate (by ICR using 2014 Lugano classification), complete response rate by ICR, duration of response by ICR, frequency and severity of adverse events, changes from baseline in safety laboratory and clinical variables, concentration and pharmacokinetic parameters of Lonca (conjugated and total antibody and unconjugated warhead), immunogenicity, and changes in patient-reported outcomes. The time to event endpoints will be analyzed based on the intent-to-treat population using a stratified log-rank test. The dosing regimen for Lonca-R: Lonca at 0.15 mg/kg + rituximab at 375 mg/m2 every 3 weeks (Q3W) for 2 cycles and then Lonca at 0.075 mg/kg + rituximab at 375 mg/m2 Q3W for up to 6 cycles. The dose regimen of R-GemOx: rituximab at 375 mg/m2, gemcitabine at 1000 mg/m2 Gem, and oxaliplatin at 100 mg/m2 every 2 weeks for up to 8 cycles. Key inclusion criteria include age ≥18 years, pathologic diagnosis of DLBCL (including pts with DLBCL transformed from indolent lymphoma) or high-grade B-cell lymphoma with MYC and BCL2 and/or BCL6 rearrangements, ≥1 line of prior systemic therapy, not being a candidate for stem cell transplantation, and measurable disease per the 2014 Lugano classification. The randomized part of LOTIS-5 commenced in January 2022, and recruitment is ongoing. Funding: ADC Therapeutics SA; medical writing: CiTRUS Health Group. Clinical trial information: NCT04384484.

Background: Bruton tyrosine kinase inhibitors (BTKis) are important tools to treat B-cell malignancies. However, duration of treatment may be limited by adverse events (AEs). Zanubrutinib (zanu) is a BTKi approved for mantle cell lymphoma (MCL) and is in development for other hematologic malignancies. Data from phase 3 head-to-head trials of zanu vs ibrutinib (ibr) in pts with Waldenström macroglobulinemia (WM) or chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL) demonstrated that pts treated with zanu showed lower rates of AEs leading to discontinuation (Blood 2020;136(18):2038-50; EHA 2021 LB1900). Preliminary results from BGB-3111-215 (NCT04116437) show that zanu was well-tolerated in pts who discontinued ibr and/or acalabrutinib (acala) treatment due to AEs (EHA 2021 EP642). Here, we report updated results from the BGB-3111-215 study with a median follow-up of 9 months. Methods: This study is an ongoing US, phase 2, multicenter, single-arm, open-label study. The safety and efficacy of zanu monotherapy (160 mg twice daily or 320 mg once daily) were evaluated in pts with B-cell malignancies who met criteria for continued treatment after having become intolerant to prior BTKi therapy. Pts were divided into cohort 1 (pts who were intolerant to ibr only) and cohort 2 (pts who were intolerant to acala alone/and ibr). Pts with documented progressive disease (PD) on prior BTKi therapy were excluded. Efficacy and safety, including recurrence of intolerant AEs to the prior BTKi, were evaluated. AEs were assessed for severity, seriousness, and relation to zanu; as well as dose reductions, holds, or discontinuations. Response was assessed by investigators based on response criteria for their respective indications (Blood 2008;131:2745; J Clin Oncol 2012;30:2820; J Clin Oncol 2014;32:3059; Br J Haemtol 2013;160:171). Disease parameters from study entry were the baseline for response assessment. Mutational analysis was performed on pts who discontinued treatment, and data will be shared once available. To support clinical findings, kinase selectivity was assessed using Kinome profiling at 100X IC50 (against BTK) for zanu, ibr, acala and its major metabolite, M27 (Reaction Biology Corp). Results: As of 7 June 2021 (data cutoff), 57 pts (n=44 CLL/SLL; n=9 WM; n=2 MCL; n=2 marginal zone lymphoma [MZL]) were enrolled in cohort 1, and 7 pts were enrolled in cohort 2 (n=4 CLL; n=1 WM; n=1 MCL; n=1 MZL). All received ≥1 dose of zanu and were analyzed for safety. The median age was 71 years (range, 49-91) in cohort 1 and 71 years (range, 65-76) in cohort 2; median duration of treatment was 8.7 months (range, 0.6-17.9) in cohort 1 and 8.2 months (range, 6.4-11.4) in cohort 2; median number of prior regimens was 1 (range, 1-12) in cohort 1 and 3 (range, 2-5) in cohort 2. Within cohort 2, 5 pts were intolerant to both ibr and acala. Median number of intolerant events per pt for both cohorts 1 and 2 was 2 (range, 1-5). Overall, 73% of pts did not experience recurrence of their ibr or acala intolerant events and 79% of recurrent events recurred at a lower severity (Figure 1). At cutoff, 54 pts remained on treatment. Reasons for treatment discontinuation were AEs (n=4), PD (n=4), physician's decision (n=1), and consent withdrawal (n=1). Grade ≥3 AEs were reported in 18 pts (28%), and serious AEs occurred in 7 pts (11%). AEs requiring dose interruptions occurred in 17 pts (27%), and AEs leading to dose reduction occurred in 3 pts (5%). One death, due to COVID-19, was reported. Pts demonstrated maintained (41%) and improved (53%) response with zanu treatment from their reported best overall response on prior BTKis for a total disease control rate of 94% (including a 42% partial response rate in pts with CLL/SLL, 30% in pts with WM, and a 20% very good partial response rate in pts with WM). Zanu also demonstrated good selectivity by kinase profiling. It showed >50% inhibition on 7/370 kinases, while ibr, acala, and M27 had more off-target binding (17, 15 and 23 kinases, respectively) at their respective 100X IC50 (BTK) concentrations (Figure 2). Conclusion: In pts with B-cell malignancies intolerant to ibr and/or acala, zanu treatment resulted in continued disease control or improved response. Zanu was well-tolerated, and most AEs that led to discontinuation of previous BTKi therapy did not recur or recurred at a lower grade. In support of clinical findings, differentiation between BTKi selectivity profiles favor zanu over ibr and acala. Figure 1 Figure 1. Disclosures Shadman: Abbvie, Genentech, AstraZeneca, Sound Biologics, Pharmacyclics, Beigene, Bristol Myers Squibb, Morphosys, TG Therapeutics, Innate Pharma, Kite Pharma, Adaptive Biotechnologies, Epizyme, Eli Lilly, and Atara Biotherapeutics, Adaptimmune: Consultancy; Mustang Bio, Celgene, Bristol Myers Squibb, Pharmacyclics, Gilead, Genentech, Abbvie, TG Therapeutics, Beigene, AstraZeneca, Sunesis, Atara Biotherapeutics, GenMab: Research Funding; Abbvie, Genentech, AstraZeneca, Sound Biologics, Pharmacyclics, Beigene, Bristol Myers Squibb, Morphosys, TG Therapeutics, Innate Pharma, Kite Pharma, Adaptive Biotechnologies, Epizyme, Eli Lilly, and Atara Biotherapeutics, Adaptimmune: Membership on an entity's Board of Directors or advisory committees. Flinn: Nurix Therapeutics: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; Seagen: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; MorphoSys: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Forty Seven: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Calithera Biosciences: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Verastem: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Curis: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Takeda: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Yingli Pharmaceuticals: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; IGM Biosciences: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; AbbVie: Consultancy, Other: All Consultancy and Research Funding payments made to Sarah Cannon Research Institute, Research Funding; Portola Pharmaceuticals: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Trillium Therapeutics: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Rhizen Pharmaceuticals: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Incyte: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Acerta Pharma: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Agios: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Kite, a Gilead Company: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Gilead Sciences: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Pharmacyclics LLC, an AbbVie Company: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Karyopharm Therapeutics: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Forma Therapeutics: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Genentech: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; ArQule: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Triphase Research & Development Corp.: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Roche: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Pfizer: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Teva: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Infinity Pharmaceuticals: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Unum Therapeutics: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Celgene: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Constellation Pharmaceuticals: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Juno Therapeutics: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; AstraZeneca: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Iksuda Therapeutics: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; Loxo: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Merck: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Novartis: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Great Point Partners: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; BeiGene: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Janssen: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; TG Therapeutics: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Century Therapeutics: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; Hutchison MediPharma: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; Vincerx Pharma: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; Sarah Cannon Research Institute: Current Employment; Servier Pharmaceuticals: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; Yingli Pharmaceuticals: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; Seagen: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; Servier Pharmaceuticals: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; Unum Therapeutics: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute, Research Funding; Johnson & Johnson: Current holder of individual stocks in a privately-held company; Seattle Genetics: Research Funding. Levy: Epizyme: Consultancy, Other: Promotional speaker; Amgen Inc.: Consultancy, Honoraria, Other: Promotional speaker, Speakers Bureau; Gilead Sciences, Inc.: Consultancy, Honoraria, Speakers Bureau; GSK: Consultancy, Other: Promotional speaker; Morphosys: Consultancy, Honoraria, Other: Promotional speaker, Speakers Bureau; AbbVie: Consultancy, Honoraria, Other: Promotional speaker, Speakers Bureau; Beigene: Consultancy, Honoraria, Speakers Bureau; Karyopharm: Consultancy, Honoraria, Other: Promotional speaker, Speakers Bureau; AstraZeneca: Consultancy, Honoraria, Speakers Bureau; Takeda: Consultancy, Honoraria, Other: Promotional speaker, Speakers Bureau; Novartis: Consultancy, Other: Promotional speaker; Dova: Consultancy, Other: Promotional speaker; TG Therapeutics: Consultancy, Honoraria, Speakers Bureau; Bristol Myers Squibb: Consultancy, Honoraria, Other: Promotional speaker, Speakers Bureau; Seattle Genetics: Consultancy, Honoraria, Other: Promotional speaker, Speakers Bureau; Jazz Pharmaceuticals: Consultancy, Honoraria, Speakers Bureau; Janssen Pharmaceuticals: Consultancy, Honoraria, Other: Promotional speaker, Speakers Bureau. Burke: SeaGen: Consultancy, Speakers Bureau; Beigene: Consultancy, Speakers Bureau; MorphoSys: Consultancy; Bristol Myers Squibb: Consultancy; AstraZeneca: Consultancy; Epizyme: Consultancy; Verastem: Consultancy; Kura: Consultancy; Kymera: Consultancy; AbbVie: Consultancy; Adaptive Biotechnologies: Consultancy; Roche/Genentech: Consultancy; X4 Pharmaceuticals: Consultancy. Cultrera: Beigene: Research Funding. Yimer: Astrazeneca: Speakers Bureau; Karyopharm: Current equity holder in publicly-traded company, Speakers Bureau; Janssen: Speakers Bureau; Beigene: Speakers Bureau; GSK: Speakers Bureau; Sanofi: Speakers Bureau; Amgen: Speakers Bureau; Pharmacyclics: Speakers Bureau; Texas Oncology: Current Employment. Chaudhry: Medical Oncology Associates, PS (dba Summit Cancer Centers): Current Employment; Novartis, Immunomedics: Current holder of individual stocks in a privately-held company. Gandhi: TG Therapeutics: Honoraria; Karyopharm Therapeutics: Honoraria; GlaxoSmithKline: Honoraria. Kingsley: Comprehensive Cancer Centers of Nevada: Current Employment. Tumula: Texas Oncology: Current Employment. Manda: Morphosys: Honoraria; Genmab: Current equity holder in publicly-traded company. Chen: BeiGene: Current Employment, Divested equity in a private or publicly-traded company in the past 24 months. Cohen: BeiGene: Current Employment, Current equity holder in publicly-traded company, Other: Travel, Accommodations, Expenses. By: BeiGene, Ltd: Current Employment. Xu: Beigene: Current Employment; AstraZeneca: Ended employment in the past 24 months. Liu: BeiGene Co., Ltd: Current Employment, Current equity holder in publicly-traded company. Sharman: TG Therapeutics: Consultancy; Centessa: Current holder of stock options in a privately-held company, Membership on an entity's Board of Directors or advisory committees; Pharmacyclics LLC, an AbbVie Company: Consultancy; BMS: Consultancy; AbbVie: Consultancy; BeiGene: Consultancy; AstraZeneca: Consultancy; Lilly: Consultancy.

Background: Covalent Bruton's Tyrosine Kinase (BTK) inhibitors (BTKi) have transformed the management of relapsed mantle cell lymphoma (MCL), but these treatments are not curative and the majority of patients will require additional treatment. Covalent BTKi share pharmacologic liabilities (e.g. low oral bioavailability, short half-life) that collectively may lead to suboptimal BTK target coverage especially in rapidly proliferating tumors with high BTK protein turnover such as MCL. To address these limitations, pirtobrutinib, a highly selective, non-covalent BTKi that inhibits both wild type (WT) and C481-mutated BTK with equal low nM potency was developed. In the phase 1/2 BRUIN study, pirtobrutinib achieved pharmacokinetic exposures that exceeded its BTK IC96 at trough, was well tolerated, and demonstrated promising efficacy in heavily pretreated, poor-prognosis MCL patients, most of whom had prior treatment with a covalent BTKi (Mato et al. Lancet 2021;397,10277:892-901). The purpose of this randomized study is to demonstrate the superiority of pirtobrutinib compared to investigator's choice of covalent BTKi in patients with previously treated MCL. Study Design and Methods: BRUIN MCL-321 is a randomized, open-label, global phase 3 study comparing pirtobrutinib monotherapy versus investigator's choice of covalent BTKi monotherapy (ibrutinib, acalabrutinib, or zanubrutinib) in patients with previously treated, BTKi naïve MCL. Approximately 500 patients will be randomized 1:1. Randomization will be stratified by sMIPI risk (low/intermediate vs high), comparator BTKi (ibrutinib vs acalabrutinib/ zanubrutinib), and number of prior lines of therapy (1 vs ≥ 2). Eligible patients are adults aged ≥18 years with a confirmed diagnosis of MCL (cyclin D1 overexpression, and ≥ 1 B-cell marker) who have received ≥ 1 prior line of systemic therapy for MCL that did not include a prior BTKi. Patients must have measurable disease per Lugano criteria and must have progressed on or relapsed following the most recent line of therapy prior to study enrollment. Key exclusion criteria include a history of current or prior CNS involvement, significant cardiovascular disease, stroke, or intracranial hemorrhage within 6 months of randomization, and allogeneic stem cell transplant (SCT), autologous SCT or chimeric antigen receptor (CAR) T-cell therapy within 60 days of randomization. The primary endpoint is progression-free survival (PFS) per Lugano criteria assessed by an independent review committee (IRC), with the goal of demonstrating superiority of pirtobrutinib over investigator's choice of covalent BTKi. Secondary endpoints include overall response rate (ORR), duration of response (DoR), investigator-assessed PFS per Lugano criteria, overall survival (OS), event-free survival (EFS), time to treatment failure (TTF), time to next treatment (TTNT), time from randomization to disease progression on next line of treatment or death from any cause (PFS2), safety and tolerability, and patient reported outcomes. This global study is currently enrolling patients (NCT04662255). Disclosures Eyre: Gilead/KITE: Honoraria, Other: Travel support for conferences, Research Funding, Speakers Bureau; Janssen: Honoraria; Loxo Oncology: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees; Incyte: Consultancy; Abbvie: Consultancy, Honoraria, Other: Travel to conferences; Roche: Consultancy, Honoraria; AstraZeneca: Honoraria, Research Funding; Beigene: Honoraria, Research Funding; Secura Bio: Consultancy, Honoraria. Shah: Miltenyi Biotec: Consultancy, Honoraria, Research Funding; Kite: Consultancy; Epizyme: Consultancy; Umoja: Consultancy; Legend: Consultancy; Incyte: Consultancy; Lily: Consultancy, Honoraria, Research Funding. Dreyling: Novartis: Consultancy, Speakers Bureau; Janssen: Consultancy, Research Funding, Speakers Bureau; Roche: Consultancy, Research Funding, Speakers Bureau; Astra Zeneca: Consultancy, Speakers Bureau; BeiGene: Consultancy; Celgene: Consultancy, Research Funding, Speakers Bureau; Amgen: Speakers Bureau; Genmab: Consultancy; Bayer HealthCare Pharmaceuticals: Consultancy, Research Funding, Speakers Bureau; Gilead/Kite: Consultancy, Research Funding, Speakers Bureau; Abbvie: Research Funding; Incyte: Consultancy, Speakers Bureau. Vandenberghe: Jansnens: Honoraria; Abbvie: Honoraria. Jurczak: Abbvie, AstraZeneca, BeiGene, Celtrion, Celgene, Debbiopharm, Epizyme, Incyte, Janssen, Loxo Oncology, Merck, Mei Pharma, Morphosys, Novo Nordisk, Roche, Sandoz, Takeda, TG Therapeutics: Research Funding; Astra Zeneca, BeiGene, Janssen, Loxo Oncology, Sandoz, Roche,: Membership on an entity's Board of Directors or advisory committees. Wang: Genentech: Research Funding; Eli Lilly: Membership on an entity's Board of Directors or advisory committees; MorphoSys: Research Funding; LOXO Oncology: Membership on an entity's Board of Directors or advisory committees, Research Funding; Novartis: Research Funding; InnoCare: Research Funding; Incyte: Membership on an entity's Board of Directors or advisory committees, Research Funding; TG Therapeutics: Membership on an entity's Board of Directors or advisory committees. Cheah: Loxo/Lilly: Consultancy, Honoraria, Other: advisory; Janssen: Consultancy, Honoraria, Other: advisory; Roche: Consultancy, Honoraria, Other: advisory and travel expenses, Research Funding; TG Therapeutics: Consultancy, Honoraria, Other: advisory; AstraZeneca: Consultancy, Honoraria, Other: advisory; Celgene: Research Funding; AbbVie: Research Funding; Beigene: Consultancy, Honoraria, Other: advisory; Ascentage pharma: Consultancy, Honoraria, Other: advisory; Gilead: Consultancy, Honoraria, Other: advisory; MSD: Consultancy, Honoraria, Other: advisory, Research Funding. Gandhi: Karyopharm Therapeutics: Honoraria; TG Therapeutics: Honoraria; GlaxoSmithKline: Honoraria. Sharman: AstraZeneca: Consultancy; Lilly: Consultancy; Pharmacyclics LLC, an AbbVie Company: Consultancy; Centessa: Current holder of stock options in a privately-held company, Membership on an entity's Board of Directors or advisory committees; BeiGene: Consultancy; BMS: Consultancy; TG Therapeutics: Consultancy; AbbVie: Consultancy. Andorsky: Abbvie: Consultancy, Research Funding; Celgene/BMS: Consultancy, Research Funding; Epizyme: Research Funding. Yin: Loxo Oncology at Lilly: Current Employment; AstraZeneca: Ended employment in the past 24 months. Balbas: Nektar Therapeutics: Current equity holder in publicly-traded company, Ended employment in the past 24 months; Loxo Oncology at Lilly: Current Employment, Current equity holder in publicly-traded company. Kherani: Loxo Oncology at Lilly: Current Employment, Current equity holder in publicly-traded company. Wang: AstraZeneca, Bayer Healthcare, BeiGene, CSTone, DTRM Biopharma (Cayman) Limited, Epizyme, Genentech, InnoCare, Janssen, Juno, Kite Pharma, Loxo Oncology, Miltenyi Biomedicine GmbH, Oncternal, Pharmacyclics, VelosBio: Consultancy; Acerta Pharma, AstraZeneca, BeiGene, BioInvent, Celgene, Innocare, Janssen, Juno, Kite, Pharma, Lilly, Loxo Oncology, Molecular Templates, Oncternal, Pharmacyclics, VelosBio: Research Funding; Acerta Pharma, Anticancer Association, AstraZeneca, BeiGene, CAHON, Chinese Medical Association, Clinical Care Options, Dava Oncology, Epizyme, Hebei Cancer Prevention Federation, Imbruvica, Imedex, Janssen, Kite Pharma, Miltenyi Biomedicine GmbH, Moffit : Honoraria.

Introduction Brentuximab vedotin (BV) and nivolumab are both active and well tolerated in patients (pts) with classical Hodgkin lymphoma (cHL) and were previously studied in first salvage (overall response rate [ORR] 85%; complete response [CR] 67%) (Advani 2021) and as firstline therapy in older adults (ORR 95%; CR 79%) (Yasenchak 2019). BV is approved for the treatment of adults with treatment-naïve Stage III or IV cHL in combination with doxorubicin, vinblastine, and dacarbazine (AVD) (Connors 2017) and targets CD30, a receptor expressed on the Reed-Sternberg cells. Nivolumab is approved for treatment of adults with relapsed/refractory cHL and restores antitumor immunity by blocking the PD-1 receptor on activated T-cells. The combination of BV plus nivolumab demonstrated promising activity that supports this combination when evaluated as a frontline treatment option for pts over 60 years of age with cHL (Friedberg 2018). Additionally, in pts with non-bulky Stage I or II cHL, treatment with BV plus doxorubicin and dacarbazine (AD) resulted in a CR rate of 97% at end of treatment (EOT), as well as a promising 4-year progression-free survival (PFS) estimate of 91%. Importantly, there were no cases of ≥Grade 3 peripheral neuropathy and only 9% were Grade 2 (Abramson 2021). Herein, we present preliminary safety results from Part B of this phase 2 study, where combination treatment with AN+AD (BV, nivolumab, doxorubicin, and dacarbazine) was well tolerated without excessive dose modifications or discontinuations and is consistent with the known safety profiles of the individual components of this treatment regimen. Methods SGN35-027 (NCT03646123) is an open-label, multiple part, multicenter, phase 2 clinical trial. Part B of this study enrolled pts with Ann Arbor Stage I or II cHL with bulky mediastinal disease (defined as ≥ 10 cm) or Stage III or IV cHL. Pts received up to 6 cycles of AN+AD (consisting of BV 1.2 mg/kg, nivolumab 240 mg, doxorubicin 25 mg/m 2, and dacarbazine 375 mg/m 2). All study drugs were administered by IV infusion on Days 1 and 15 of each 28-day cycle. The primary endpoint was CR rate at EOT. Secondary endpoints included safety, tolerability, overall response rate, and PFS. Disease response and progression was assessed by investigators using the Lugano Classification Revised Staging System for nodal non-Hodgkin and Hodgkin Lymphomas (Cheson 2014) and Lymphoma Response to Immunomodulatory Therapy Criteria (LYRIC) (Cheson 2016) at Cycle 2 and EOT. Results In Part B, the majority of the 58 pts enrolled were white (86%), not of Hispanic or Latino/a or Spanish origins (79%), and less than 65 years old (95%). Median age was 35 years (range: 19-78 years). Twenty-nine percent of pts had Stage II cHL with bulky mediastinal disease, while the remainder had Stage III (17%) or Stage IV (50%) cHL. Of the 58 pts enrolled, 57 received at least one dose of study treatment. Of the 57 pts who received at least one dose of study treatment, 1 pt discontinued treatment (all study drugs) by the end of Cycle 2 due to treatment-emergent adverse events (TEAEs). By end of Cycle 2, the majority of TEAEs were Grades 1 and 2; 16% of pts experienced ≥Grade 3 TEAEs. Nausea, fatigue, and alopecia were the most frequently reported treatment-related TEAEs (51%, 33%, and 26% of pts, respectively). No febrile neutropenia was observed, and there were no Grade 5 adverse events. Two pts (4%) experienced treatment-related treatment-emergent serious adverse events; 1 pt (2%) experienced hypophysitis and aseptic meningitis, and discontinued treatment, and 1 pt (2%) experienced pneumonitis. Preliminary efficacy results are anticipated for presentation. Conclusions Preliminary results demonstrate that AN+AD is well-tolerated, and no new safety signals were observed. The omission of bleomycin and vinblastine may have contributed to the absence of certain AEs, such as febrile neutropenia. This study of AN+AD is ongoing, and updated safety and efficacy results will be presented at the meeting. Disclosures Lee: BMS: Honoraria, Research Funding; Aptitude Health: Honoraria; Century Therapeutics: Consultancy; Pharmacyclics: Research Funding; Guidepoint: Honoraria; Oncternal: Research Funding; Seagen: Research Funding; Takeda: Research Funding; Celgene: Research Funding; Janssen: Honoraria. Flinn: Agios: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Curis: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; TG Therapeutics: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Iksuda Therapeutics: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; Karyopharm Therapeutics: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Loxo: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; IGM Biosciences: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Seagen: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Kite, a Gilead Company: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Merck: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Acerta Pharma: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Trillium Therapeutics: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Genentech: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Janssen: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Yingli Pharmaceuticals: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; Portola Pharmaceuticals: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; BeiGene: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Takeda: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; AstraZeneca: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Verastem: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Juno Therapeutics: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Great Point Partners: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; Infinity Pharmaceuticals: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Novartis: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Forty Seven: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Gilead Sciences: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Celgene: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Calithera Biosciences: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Teva: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Pharmacyclics LLC, an AbbVie Company: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; AbbVie: Consultancy, Other: All Consultancy and Research Funding payments made to Sarah Cannon Research Institute, Research Funding; Constellation Pharmaceuticals: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Pfizer: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; MorphoSys: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; ArQule: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Rhizen Pharmaceuticals: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Forma Therapeutics: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Nurix Therapeutics: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; Roche: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Triphase Research & Development Corp.: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Incyte: Other: All research funding payments made to Sarah Cannon Research Institute, Research Funding; Unum Therapeutics: Consultancy, Other: All consultancy and research funding payments made to Sarah Cannon Research Institute, Research Funding; Century Therapeutics: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; Hutchison MediPharma: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; Vincerx Pharma: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; Sarah Cannon Research Institute: Current Employment; Servier Pharmaceuticals: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; Yingli Pharmaceuticals: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; Seagen: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; Servier Pharmaceuticals: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute; Unum Therapeutics: Consultancy, Other: All consultancy payments made to Sarah Cannon Research Institute, Research Funding; Johnson & Johnson: Current holder of individual stocks in a privately-held company; Seattle Genetics: Research Funding. Melear: Astrazeneca: Speakers Bureau; TG Therapeutics: Speakers Bureau; Janssen: Speakers Bureau. Ramchandren: curis: Research Funding; MERCK: Consultancy, Research Funding; pharmacyclics: Consultancy, Research Funding; seattle genetics: Consultancy, Research Funding; BMS: Consultancy; Trillium: Research Funding. Friedman: Seagen Inc.: Research Funding. Burke: MorphoSys: Consultancy; Beigene: Consultancy, Speakers Bureau; AbbVie: Consultancy; Epizyme: Consultancy; Adaptive Biotechnologies: Consultancy; Bristol Myers Squibb: Consultancy; Kymera: Consultancy; AstraZeneca: Consultancy; Verastem: Consultancy; Kura: Consultancy; X4 Pharmaceuticals: Consultancy; SeaGen: Consultancy, Speakers Bureau; Roche/Genentech: Consultancy. Linhares: Seagen Inc.: Research Funding. Peterson: Seagen Inc.: Research Funding. Raval: Abbvie Pharmaceuticals: Speakers Bureau; Adaptive Biotechnologies: Consultancy; ADCT Therapeutics: Consultancy, Speakers Bureau; Alexion Pharmaceuticals: Speakers Bureau; Amgen Biotechnology Company: Research Funding; Astellas Pharmaceuticals: Speakers Bureau; Astrazeneca Pharmaceuticals: Consultancy, Speakers Bureau; Beigene Pharmaceuticals: Speakers Bureau; Bristol Meyers Squibb Pharmaceuticals: Consultancy; Epizyme Pharmaceuticals: Consultancy, Speakers Bureau; Genetech Biotechnology Company: Research Funding; GlaxoSmithKline Pharmaceuticals: Consultancy; Incyte Pharmaceuticals Corporation: Speakers Bureau; Jazz Pharmaceuticals: Consultancy; Karyopharm Therapeutics: Consultancy; Morphosys Biotech Company: Speakers Bureau; Sanofi Genzyme: Consultancy; Seagen Biotechnology Company: Research Funding; Takeda Pharmaceuticals: Consultancy, Speakers Bureau. Chintapatla: Seagen Inc.: Research Funding. Feldman: Alexion, AstraZeneca Rare Disease: Honoraria, Other: Study investigator. Yimer: Janssen: Speakers Bureau; Beigene: Speakers Bureau; Astrazeneca: Speakers Bureau; Karyopharm: Current equity holder in publicly-traded company, Speakers Bureau; GSK: Speakers Bureau; Sanofi: Speakers Bureau; Amgen: Speakers Bureau; Pharmacyclics: Speakers Bureau; Texas Oncology: Current Employment. Islas-Ohlmayer: Seagen Inc.: Research Funding. Dean: Seagen Inc.: Research Funding. Rana: Seagen Inc.: Research Funding. Gandhi: GlaxoSmithKline: Honoraria; Karyopharm Therapeutics: Honoraria; TG Therapeutics: Honoraria. Renshaw: Amgen: Speakers Bureau; SeaGen: Consultancy; Jazz Pharmaceuticals: Consultancy, Speakers Bureau; AbbVie: Consultancy, Speakers Bureau; Texas Oncology: Current Employment. Gillespie-Twardy: Seagen Inc.: Research Funding. Ho: Seagen Inc.: Current Employment, Current equity holder in publicly-traded company. Fanale: Seagen, Inc: Current Employment, Current equity holder in publicly-traded company. Guo: Seagen Inc.: Current Employment, Current equity holder in publicly-traded company. Yasenchak: Seagen Inc.: Research Funding.