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Abstract Introduction LINVO, a human B-cell maturation antigen (BCMA)xCD3 bispecific antibody, was recently approved for triple-class exposed (TCE) RRMM after ≥3 prior therapies (EU) or ≥4 prior lines of therapy (US), demonstrating high efficacy and a generally manageable safety profile. Combining LINVO with an anti-CD38 mAb, such as DARA or ISA, may provide additional benefit to pts with RRMM. Here we report pooled safety and efficacy results from the LINVO + DARA and LINVO + ISA cohorts during the dose-finding portion of the Phase 1b LINKER-MM2 trial (NCT05137054). Methods Eligible pts were aged ≥18 years with RRMM that progressed after ≥3 lines of therapy (LoTs), or ≥2 LoTs if TCE or double-class refractory (immunomodulatory drug [IMiD] + proteasome inhibitor [PI]). Prior treatment (tx) with DARA or ISA was allowed if previously tolerated and ≥6 months (mos) or ≥3 mos washout, respectively, had elapsed since last exposure. Tx began with LINVO monotherapy (Cycle [C]0; 28-day cycle) consisting of 2 step-up doses (5 mg, 25 mg) and 2 full doses (dose level [DL]1 100 mg; DL1b 150 mg; DL2 200 mg) before standard dosing of DARA or ISA was added at C1. LINVO was given once weekly in C1–3 and once every 2 weeks in C4+. At the end of 2024, dosing once every 4 weeks was implemented after C6 if a very good partial response or better (≥VGPR) was achieved. Dexamethasone premedication was required during the first 2 cycles and then given per label for DARA or ISA. Primary endpoints: dose-limiting toxicities (DLTs) and tx-emergent adverse events (TEAEs). Key secondary endpoints: overall response rate (ORR), duration of response (DOR), progression-free survival (PFS), and rate of minimal residual disease (MRD) negativity. The analyses reported here combine the LINVO + DARA and LINVO + ISA cohorts. Results As of May 7, 2025, 42 pts were enrolled. All pts were included in the safety analysis set: DL1 (DARA, n=12; ISA, n=6), DL1b (n=6; n=10), or DL2 (n=8; n=0); 37 were included in the efficacy analysis set: DL1 (DARA, n=11; ISA, n=5), DL1b (n=5; n=9), or DL2 (n=7; n=0). At baseline, all pts had received ≥1 PI (refractory to ≥1 PI: 76%) or ≥1 IMiD (refractory to ≥1 IMiD: 86%), and 21 pts (50%) had received prior DARA or ISA (refractory to DARA or ISA: 33% [DARA, n=4; ISA, n=10]). Median number of prior LoTs was 3 (range 2–8), including 50% of pts with TCE and 21% with triple-class refractory disease. Median age was 68 years (range 42–86); male, 57%; ISS stage III at study entry, 12%; high-risk cytogenetics, 31%; bone marrow plasma cells ≥50%, 31%; and soft tissue plasmacytomas, 33% (extramedullary, 12%). Median follow-up duration was 14.8 mos for DL1 (DARA 21.3; ISA 11.3), 7.6 mos for DL1b (DARA 13.5; ISA 5.2), and 5.9 mos for DL2 (all DARA), with 44%, 50%, and 63% of pts still receiving tx, respectively. The most common TEAEs were anemia (any grade [Gr] 48%; Gr 3/4 26%), neutropenia (41%; 41%), diarrhea (38%; 2%), and thrombocytopenia (38%; 17%). Cytokine release syndrome was reported in 33% of pts (all Gr 1/2 events except 1 Gr 3 event during the step-up period that fully resolved). No pts experienced immune effector cell-associated neurotoxicity syndrome (ICANS). Infections were reported in 32 pts (any Gr 76%; Gr ≥3 40%), and 3 resulted in death (1 tx related: cytomegalovirus [CMV] pneumonia; 2 tx unrelated: C. diff colitis and lower respiratory infection). One DLT was observed at DL1b in the ISA cohort (Gr 3 Epstein–Barr virus pharyngitis) and 1 was observed at DL2 in the DARA cohort (Gr 5 CMV pneumonia). Among efficacy evaluable pts, ORR was 75% at DL1 (12/16; ≥VGPR rate 75%), 93% at DL1b (13/14; ≥VGPR rate 57%), and 86% at DL2 (6/7; ≥VGPR rate 86%). Of 10 MRD-evaluable pts, all were MRD negative (<10−5by clonoSEQ or EuroFlow). The 12-mo DOR rate was 79% (95% confidence interval [CI] 52–92; median DOR not reached) and 12-mo PFS rate was 73% (95% CI 53–86; median PFS not reached). Pharmacokinetic analyses showed LINVO concentrations were not affected by the addition of DARA or ISA. ConclusionsIn pts with heavily pretreated RRMM, half of whom had prior anti-CD38 mAb exposure, the combination of LINVO and DARA or ISA was feasible, inducing a high rate of deep and durable responses, and exhibiting a safety profile similar to that reported for each individual drug. These preliminary data support continued development of LINVO plus an anti-CD38 mAb for the tx of pts with MM.

Abstract Introduction: BL and DLBCL are the two most common lymphomas associated with HIV infection. Notably, clinical trials often exclude HIV-positive patients and prior retrospective studies often lacked long-term follow-up on overall survival (OS). This has limited our knowledge about the influence of HIV status on survival in BL and DLBCL. Survival outcomes can also vary significantly across ethnic groups, influenced mostly by disparities in healthcare access and socioeconomic status. Additionally, survival rates differ among age groups, which may be attributed to tolerance to intensive chemotherapy and the presence of comorbid medical conditions. Our study primarily focused on comparing OS between HIV-positive and negative patients with DLBCL and BL in the real world. We also examined OS disparities among diverse ethnicities and age groups. Method: Patients diagnosed with DLBCL and BL were identified from the Cerner Health Facts database over five years from 2013 to 2018 using ICD-9 and ICD-10 codes. Within this cohort, individuals with a positive HIV status were identified through specific ICD-9 and ICD-10 codes. Demographic characteristics including age, gender, and ethnicity were collected for all patients, and they were stratified into distinct age groups: <20 years, 20-39 years, 40-59 years, 60-79 years, and 80+ years. OS was calculated for all patients from the time of diagnosis to time of death or hospice discharge. A multivariate cox regression model was employed to adjust for confounding variables. Results: The total number of patients diagnosed with DLBCL and BL was 10,534. Of these patients, 45.3% were female. The ethnic composition included 77% Caucasian, 10.3% African American and 12.7 % from other ethnicities. Among this population, 315 patients were HIV positive. In the cohort of DLBCL patients, 8,275 were HIV negative and 185 were HIV positive. In the cohort of BL patients, 1,944 were HIV negative and 130 were HIV positive. Among patients with DLBCL, HIV positive status had more than two-fold higher mortality rate compared to their HIV negative counterparts (HR=2.1, 95% CI 1.31 to 3.36, p=0.0018). Patients with BL who were HIV positive had no difference in OS in comparison to the HIV negative group (p=0.575). African American patients with DLBCL had almost 40% increased risk of mortality compared to Caucasian patients (HR=1.39, 95% CI 1.05-1.83, p=0.017). African American patients with BL had no difference in OS compared to Caucasian patients (p=0.3). Patients aged 60-79 years were found to have 44% higher risk of mortality compared to 40-59 age group (HR=1.44, 95% CI 1.13-1.83, p=0.0033) and patients aged 80 years or above were found to have more than two-fold higher risk of mortality in the DLBCL cohort (HR=2.16, 95% CI 1.63-2.87, p<0.0001). For patients with BL, those aged 20-39 had half the risk of mortality as compared to the 40-59 age group (HR= 0.50, 95% CI 0.28 - 0.87, p=0.014) whereas patients aged 80 or older had almost three times higher risk of mortality (HR = 2.87, 95% CI 1.81-4.57, p<0.0001). Conclusion: HIV status can significantly influence survival outcomes in patients diagnosed with DLBCL. Early identification of HIV infection, along with the initiation of prompt antiretroviral therapy and the administration of appropriate intensive chemotherapy regimens, is crucial for optimizing treatment outcomes in this patient population. Notably, our study indicates that African American patients exhibit a higher mortality rate compared to their Caucasian counterparts with DLBCL. This could be related to disparities in access to healthcare and treatment resources across different ethnicities. Moreover, it also indicates possible lymphoma biological heterogeneity in various ethnicities. Furthermore, elderly patients demonstrate increased mortality rates likely attributed to a greater prevalence of frailty, indicating the need for innovative less intense regimens for these patients with DLBCL and BL.

Abstract Background: Intravenous (IV) isatuximab plus pomalidomide and dexamethasone (Isa-Pd) is approved for treatment in patients with relapsed/refractory multiple myeloma (RRMM) based on the ICARIA-MM study. Subcutaneous (SC) administration of Isa offers potential advantages such as shorter administration duration and greater patient comfort compared with IV routes. Isa SC via an on-body injector (OBI), an investigational wearable bolus injector, demonstrated safety and efficacy in a Phase 1b study in patients with RRMM. The IRAKLIA trial (NCT05405166) was the first Phase 3 trial evaluating the non-inferiority of Isa-Pd SC via an OBI vs Isa-Pd IV in patients with RRMM. Here, we report the findings of the IRAKLIA trial in the East Asian subgroup with RRMM. Methods: This global, multicenter, open-label study enrolledpatients aged ≥18 years with RRMM who had received ≥1 prior line of therapy (LOT) including lenalidomide and a proteasome inhibitor (PI). Patients were randomized 1:1 to Isa SC (1400 mg) or Isa IV (10 mg/kg) weekly in Cycle (C)1, then every 2 weeks in addition to P (4 mg orally daily, Day [D]1-21) and d (40 mg orally [20 mg if age ≥75 years] weekly). Treatment was administered in 4-week cycles and continued until disease progression, unacceptable toxicity, or patient withdrawal. Co-primary endpoints included overall response rate (ORR) and observed Isa concentration before dosing (Ctrough) at steady state (predose at C6D1). Key secondary endpoints included rate of very good partial response or better (≥VGPR), Ctroughlevel Cycle 2 Day 1 (C2D1), infusion reaction incidence, and patient satisfaction rate based on the patient experience and satisfaction questionnaire (PESQ) at C5D15. Results: The East Asian subgroup consisted of 105 patients from China (Mainland, n=82 and Taiwan, n=1) and Japan(n=22) (SC, n=50; IV, n=55). Baseline characteristics of the East Asian subgroup were generally balanced between the two arms and generally comparable to the overall global population (median age 62 years; median 2 prior LOT; 29.5% high-risk cytogenetics; 82.9% refractory to lenalidomide; 7.6% prior exposure to daratumumab). After a median of 13.0 months follow-up, ORR in the SC and IV arm was 74.0% and 70.9%, respectively (relative risk [95% CI] = 1.044 [0.815 – 1.335]). The mean (SD) of Ctroughat C6D1 was 502 (232) µg/mL for SC arm and 282 (123) µg/mL for IV arm. The geometric mean ratio (90% CI) comparing SC to IV for Ctrough at steady state was 1.756 (1.346 – 2.290). The ≥VGPR rates were 58.0% for SC and 50.9% for IV (relative risk [95% CI] = 1.139 [0.798 – 1.631]). The mean(SD) of C2D1 Ctroughlevel was 420 (161) µg/mL for the SC arm and 262 (111) µg/mL for IV arm. The geometric mean ratio (90% CI) comparing SC to IV for Ctrough at C2D1 was 1.673 (1.321 to 2.120). The infusion reaction incidence was 0% and 21.8% for SC and IV, respectively. Grade ≥3treatment-emergent adverse events were observed in 82.0% and 87.3% of patients in the SC and IV arms, respectively. Treatment discontinuation rates were 6% for the SC arm and 12.7% for the IV arm. Injection site reactions (ISRs) occurred in 4% (2/50) of patients in the SC arm and in 0.21% (2/964) of SC injections (all Grade 1), with 99.3% of SC injections completed successfully. Isa SC patients expressed higher satisfaction with their injection method, with 64.0% of patients reporting “satisfied” or “very satisfied” vs 52.7% of Isa IV patients (odds ratio [95% CI] = 1.594 [0.728 – 3.489]). Conclusions: The efficacy, safety and pharmacokinetic results between Isa SC vs IV + Pd in the East Asian population from the IRAKLIA study were consistent with the results of the overall global population, in which non-inferiority of ORR, Ctrough at C6D1, ≥VGPR and Ctrough at C2D1 was demonstrated and statistically significantly fewer infusion reactions and higher patient satisfaction were also noted for SC vs IV. These results support the potential use of Isa SC delivered via OBI in East Asian patients and demonstrate the potential of this delivery method to improve patient experience and practice efficiency.

Abstract Background Secondary central nervous system lymphoma (SCNSL) is a rare but significant complication, affecting approximately 2–10% of patients with diffuse large B-cell lymphoma (DLBCL), often leading to poor outcomes. The CNS-International Prognostic Index (CNS-IPI) remains a widely adopted tool for estimating CNS relapse risk; however, recent advances in molecular profiling and evolving treatment paradigms have challenged the adequacy of CNS-IPI alone in guiding risk assessment. This study evaluates the prognostic relevance of CNS-IPI in conjunction with molecular and clinical factors, specifically cell-of-origin (COO), gene expression, and frontline treatment regimens. The aim is to refine risk stratification and identify patients at highest risk for SCNSL. Method Building on our previous study, we analyzed data from patients with newly diagnosed DLBCL between 2002 and 2023, enrolled in the Mayo Clinic/University of Iowa Lymphoma Molecular Epidemiology Resource. Patients with primary CNS lymphoma, CNS involvement at diagnosis, or who received CNS-directed therapy were excluded. COO was determined using the Hans algorithm and/or Nanostring profiling. Multivariate cause-specific Cox regression models were used to estimate hazard ratios (HR) and 95% confidence intervals (CIs) for predictors of CNS relapse that were measured at the time of initial DLBCL diagnosis. Cumulative incidence with competing risks and cause-specific Cox models were used to analyze relapse risk. Result We included 2137 patients in our analysis, median age at diagnosis was 63 (IQR 53-72), with 41.6% (n=890) females. The albumin level was below normal in 32.5% (n=350), 64.0% (n=1367) had CNS-IPI of intermediate/high, 37.5% (n=586) had non-germinal center B-cell (GCB) COO, and 14.5% (n=309) were double expressor positive. At a median follow-up of 83 months (IQR 42 -143), 82 (3.8%) SCNSL relapses were observed; the 3 and 5 yrs cumulative incidence for SCNSL from time of DLBCL diagnosis were 3.7% (95% CI 3.0-4.7) and 3.8% (95% CI 3.1-4.8) respectively. In models accounting for death as a competing risk, the 5-year cumulative SCNSL incidence estimate for patients with a CNS-IPI low was 1.5% (95% CI 0.8-2.7), Intermediate was 4.9% (95% CI 3.7-6.4), and high was 6.1% (95% CI 3.8-9.6). The 5-year cumulative SCNSL incidence estimate for patients with non-GCB COO was 5.2% (95% CI 3.6-7.4) compared to 2.4% (95% CI 1.6-3.6; p=0.001) for GCB patients, and the 5-year cumulative SCNSL incidence for double expressor positive patients was 8.6% (95% 5.8-12.6) compared to 1.5% (95% CI 0.8-2.7; p<0.001) for double expressor negative patients. In a multivariable model (including CNS-IPI, COO, double expressor, treatment group, extranodal involvement, and albumin group), CNS-IPI intermediate (HR 2.85 [1.58-5.14]; p<0.001) and high (HR 4.31 [2.15-8.65]; p<0.001), non-GCB COO (HR 2.36 [1.37-4.06]; p=0.002], double expressor (HR 5.56 [2.88-10.73]; p<0.001), and below normal albumin (HR 1.89 [1.02-3.50]; p=0.042) were independently associated with increased risk of SCNSL. The majority of the SCNSL relapse occurred within the first 2 years after DLBCL diagnosis; 81.7% (n=67), with only 6.1% (n=5) occurring after 5 years. For patients who developed SCNSL, the median OS from the time of SCNSL diagnosis was 24 months (95% CI 17-34), with 5 years OS of 31% (95% CI 22-43). These findings are being validated using an external, international cohort, and final analysis will be presented at the time of presentation at ASH. Conclusion In this large, prospectively followed cohort with long-term follow-up data, SCNSL remains a rare but devastating complication of DLBCL, with a 5-year cumulative incidence of 3.8% and it is associated with very poor long-term survival. While CNS-IPI remains a strong predictor of SCNSL risk, our study identifies non-GCB COO and double expressor phenotype as independent, additive molecular risk factors. These findings suggest that current risk stratification tools may underestimate the risk of CNS relapse in molecularly defined high-risk subgroups. Considering the poor outcomes linked to SCNSL and the absence of a connection with frontline treatment types, future research should aim to enhance risk prediction models through molecular profiling and explore prophylactic strategies to reduce the likelihood of SCNSL.

Abstract Introduction Nearly 60% of pts with diffuse large B-cell lymphoma (DLBCL) are cured with first-line chemoimmunotherapy; ~40% will relapse or have refractory disease, mostly pts with high International Prognostic Index (IPI) scores of 3–5. Pts with IPI scores of 1–2 with bulky disease and/or very high LDH levels have also been identified as a high risk (HR) population (Maurer et al, ASH 2023, #4512). GOLCA is a potential, first-in-class, oral CELMoD agent designed for the treatment (Tx) of lymphoma, with preferential distribution to lymphoid organs and enhanced activity in lymphoma cell lines. GOLCA drives the closed, active conformation of cereblon to induce rapid and deep degradation of Ikaros and Aiolos, leading to direct cell killing (agnostic of cell of origin [COO]) and immunomodulatory activity. CC-220-DLBCL-001 (NCT04884035) is an ongoing Phase 1b, open-label, multicenter trial to assess safety and preliminary efficacy of GOLCA+R-CHOP in previously untreated a-BCL. GOLCA+R-CHOP demonstrated a manageable safety profile and encouraging efficacy with high end of Tx (EOT) complete metabolic response (CMR) and minimal residual disease (MRD) negativity rates (Amzallag et al, ASH 2024, #579). We report efficacy results with median follow-up (f/u) of 24 mos, including 24-mo progression-free survival (PFS) rates. Methods Pts aged ≥18 years with ECOG PS ≤2, IPI 0–5 (Part 1) and IPI 2–5 (Part 2), and previously untreated a-BCL with measurable disease were included. Pts were treated with GOLCA+R-CHOP for 6 cycles of 21 days (D) or until disease progression/unacceptable toxicity/study withdrawal. In dose escalation, GOLCA dose levels were 0.2mg D1–7, 0.4mg D1–7 (recommended Ph 2 dose), or 0.4mg D1–10. In dose expansion, pts were randomized 1:1 to R-CHOP+GOLCA 0.2 or 0.4mg. Primary endpoint was safety of GOLCA at 0.4mg (cutoff 23 Sep 2024); efficacy (cutoff 12 May 2025) was a secondary endpoint. HR pts were defined as: IPI 1-2 with HR features (≥1 lesion with maximum diameter ≥7 cm and/or screening LDH >1.3×ULN) or IPI 3–5. Results At cutoff, 78 pts were treated with GOLCA+R-CHOP (n=35 at 0.2mg D1–7, n=37 at 0.4mg D1–7, n=6 at 0.4mg D1–10). Baseline characteristics were described previously. Sixty-five pts (83%) completed Tx, and 72 (92%) entered the f/u period (61 [78%] ongoing). Tx was discontinued in 17% of pts, primarily due to progressive disease (3%) and adverse events (AEs; 6%). Median relative dose intensity for GOLCA and CHO components was high (97%–99%), indicating uncompromised delivery of curative standard-of-care (SOC) Tx. Seventy-two pts were efficacy evaluable (n=34 at 0.2mg D1–7, n=33 at 0.4mg D1–7). At 0.4mg, EOT CMR rate was 88% (29/33); all 29 pts were alive and progression free at cutoff. In HR pts at 0.4mg, EOT CMR rate was 89% (25/28) and was similar in pts with GCB (16/17 [94%]) and non-GCB/ABC (9/11 [82%]) phenotypes. Of pts treated with 0.4mg with available ctDNA data, 90% achieved MRD negativity (undetectable ctDNA by PhasED-Seq assay) at EOT. All pts still in f/u at time of data cutoff had reached the 24-mo efficacy assessment. At median f/u of 24 mos (range, 0.7–34.4), the 24-mo PFS rate was 79% in both 0.4mg and HR 0.4mg pts and consistent in pts with GCB (88%) and non-GCB/ABC (73%) phenotypes. The 24-mo OS at 0.4mg was 85.3% overall and 86.2% in HR pts. Pts treated at 0.4mg D1–7 and D1–10 had comparable exposure to GOLCA (no pt completed the 10-day schedule). In pooled D1–7 and D1–10 schedules, 24-mo PFS was 82% in overall and HR populations. Grade 3/4 Tx-emergent AEs (TEAEs) in the safety population were mainly hematologic and occurred in 91% of pts (neutropenia [87%], an on-target side effect of GOLCA; thrombocytopenia [42%]; anemia [36%]; febrile neutropenia [22%]); neutrophil nadir and recovery occurred in a predictable fashion. Serious TEAEs occurred in 36 pts (46%). Non-hematologic AEs (fatigue, rash, GI disorders) were infrequent and mostly low grade. Conclusions GOLCA (0.4mg) +R-CHOP resulted in a high rate of durable CMRs, irrespective of COO, and promising 24-mo PFS in the overall and HR populations. GOLCA+R-CHOP demonstrated a predictable and manageable safety profile with low rates of non-hematologic AEs; addition of GOLCA to R-CHOP did not compromise SOC delivery. These data continue to show that GOLCA 0.4mg, when added to SOC Tx, has a potential to cure more previously untreated pts with HR LBCL and support the ongoing Phase 3 trial, GOLSEEK-1, in this population (NCT06356129).

Abstract Introduction Approximately 40% of patients with DLBCL will experience relapse after initial treatment with standard-of-care chemo-immunotherapy. Effective treatment options are limited for patients who experience first-line treatment failure, particularly for those with R/R disease following CAR T-cell therapy or those not able to receive CAR T-cell therapy (Sehn et al, N Engl J Med. 2021). GOLCA is a potential, first-in-class, oral CELMoD agent designed for the treatment of lymphoma, with preferential distribution to lymphoid organs and enhanced activity in lymphoma cell lines. GOLCA drives the closed, active conformation of cereblon to induce rapid and deep degradation of Ikaros and Aiolos, leading to direct cell killing (agnostic of cell of origin) and immunomodulatory activity. In the two-part, multicenter, first-in-human Phase 1/2 study (CC-99282-NHL-001; NCT03930953), GOLCA was well tolerated and effective in patients with R/R DLBCL (Bachy et al, ICML 2025, #148). Here, we provide longer follow-up in patients with R/R DLBCL from Part B of the study. Methods Patients with R/R DLBCL and disease progression after ≥ 2 lines of therapy or transplant-ineligible patients after ≥ 1 line of therapy were included in the study. Patients received GOLCA monotherapy orally, once daily at different dosing schedules in Part A. In Part B, GOLCA was dosed at 0.2 or 0.4 mg (14 days on/14 days off) ± R. Total GOLCA treatment duration was up to 2 years or until progressive disease (PD)/unacceptable toxicity. Primary objectives included safety and recommended Phase 2 dose determination. Results As of April 3, 2025, a total of 77 patients with R/R DLBCL were enrolled in Part B Cohort C (GOLCA 0.2 mg + R, n = 39; GOLCA 0.4 mg + R, n = 38). Median age was 66 years (range, 20–86). Patients were heavily pre-treated; median number of prior treatments was 4 (range, 1–11), 55% of pts had prior CAR T-cell therapy, 38% had prior bispecific antibody treatment, and 44% were refractory to last treatment. Ten patients (13%) were ongoing, 4 completed 2 y of treatment, and 63 (82%) had discontinued treatment, mostly due to PD (n = 48 [62%]). The most common any-grade (G) treatment-emergent adverse events (AEs) in the 0.2- and 0.4-mg cohorts, respectively, were neutropenia (54% and 84%), an on-target side effect of GOLCA, and anemia (44% and 45%). G3/4 neutropenia was reported in 49% of patients with 0.2 mg and 79% with 0.4 mg, and febrile neutropenia (FN) in 5% and 16%, respectively. Granulocyte colony-stimulating factor was used in 81% and 88% of patients with neutropenia and 50% and 100% of patients with FN in the 0.2-mg and 0.4-mg cohorts. Dose interruptions (mainly due to infections/neutropenia) occurred in 49% and 53% of patients and discontinuations due to AEs occurred in 10% and 3% with 0.2 and 0.4 mg. One G5 pneumonia was considered related to study treatment (0.2 mg). The median follow-up was 11.8 months (range, 3.1–35.1) with 0.2 mg and 16.2 months (range, 3.8–31.4) with 0.4 mg. The overall response rate (ORR) in efficacy evaluable patients was 34% (complete response rate [CRR], 20%) with 0.2 mg (n = 35) and 58% with 0.4 mg (n = 36), including a CRR of 44% with this dose. In patients with prior T-cell–redirecting treatment, the ORR was 33% (CRR, 22%) with 0.2 mg (n = 18) and 56% (CRR, 38%) with 0.4 mg (n = 16). Seven of 35 (0.2 mg) and 14 of 36 (0.4 mg) patients experienced durable response > 12 months. The median time to response with both 0.2 and 0.4 mg was 1.8 months. In patients with durable responses (remained in response [CR or partial response] for more than two consecutive efficacy assessments) to GOLCA, circulating tumor DNA reduction from baseline continues to deepen over time. Response was similar across clones/tumor variants. Conclusions With additional follow-up, GOLCA + R continued to demonstrate a predictable and manageable safety profile, with no new safety signals observed at longer follow-up. Durable responses were shown in heavily pretreated patients with R/R DLBCL, including those with prior T-cell–redirecting therapy. GOLCA + R induced a decrease in circulating tumor DNA across tumor variants. These data support the ongoing development of GOLCA + R in patients with R/R non-Hodgkin lymphoma.

Abstract Introduction: Epcoritamab (epco) and glofitamab (glofit) are bispecific antibodies (BsAbs) approved for the treatment of patients (pts) with relapsed or refractory (r/r) large B-cell lymphomas (LBCLs). Their use is associated with relatively high response rates, with some patients experiencing prolonged remission. It is unclear whether continuous treatment beyond 12 months for pts in remission is beneficial, as continued immunosuppression may result in additional toxicity. We sought to report the outcomes of pts with prolonged remission and survival following BsAb administration. Methods: We performed a multicenter retrospective study including 21 US centers evaluating pts with r/r LBCLs receiving commercially available epco or glofit between 2023 and 2025. Baseline characteristics and outcomes were extracted from medical records. Efficacy and survival outcomes were assessed by site investigators and included overall response rate (ORR), complete and partial response (CR, PR) rates. Pts who responded to BsAbs and had ≥365 days of follow-up from initiation of BsAb treatment were included in the analysis. Results: As of May 15, 2025, a total of 312 pts with r/r LBCLs were treated with BsAbs (epco n=193, glofit n=119) with a median age of 66 years (interquartile range [IQR] 59-73) at BsAb start. Most were male (64.5%), had advanced stage disease (77.4%) and had ECOG performance status of ≤1 (93.3%) at BsAb start. Of 207 pts who had initiated treatment with BsAb ≥12 months prior to data cutoff, we identified 31 pts (15.0%) who had a response to BsAbs (19 epco, 12 glofit) and were alive without progression at 12-months post-BsAb initiation and included them in this landmark analysis. Of the cohort of 19 pts treated with epco, 6 discontinued due to reasons other than disease progression including CAR-T cell therapy (n=2), secondary malignancy (n=2), allogeneic transplant (n=1), or other reasons (n=1). Thirteen of 19 pts received ≥12 months of epco treatment, and, with a median follow-up of 16 months from the start of BsAb, 12 of 13 pts continued receiving epco beyond 12 months with one pt discontinuing after 12 months (observed for an additional 41 days prior to censoring). Of the cohort of 12 pts treated with glofit, 8 pts were observed after completing all planned therapy and 4 patients underwent allogeneic transplant. Among all 31 BsAb-treated patients alive and in remission at 12 months, at the time of data cutoff, 5 pts (12.9%) had progressed (2 previously treated with epco and 3 with glofit). Three of the 4 pts who underwent allogeneic transplant after prior glofit treatment experienced disease relapse. A total of 24 pts (77.4%) were alive at the time of last follow-up, with the causes of death being disease progression (n=1), secondary malignancy (n=1), infection (n=1), and unknown cause (n=4). Conclusions: In this large cohort of r/r LBCL pts treated with BsAbs monotherapy in the standard of care setting, a relatively small proportion of pts (15%) achieve the 12 month PFS landmark. In the absence of robust evidence for what constitutes best practice, different strategies are employed, including continuation of BsAb, observation as well as consolidation with allogeneic transplant or CAR T-cell therapy. Additional follow-up will be reported to help guide clinical decision making regarding the optimal management strategy for this high risk pt population.

Abstract Background: Haploidentical allogeneic stem cell transplantation (haplo-SCT) has been a transformative option for patients lacking matched donors. Post-transplant cyclophosphamide (PTCy) at 100 mg/kg total dose (50 mg/kg on Day +3 and +4) is a standard for graft-versus-host diseases (GvHD) prophylaxis. Efforts to decrease toxicity while maintaining efficacy have informed pursuits of dose de-escalation. However, data regarding the efficacy and safety of reduced-dose PTCy (<100 mg/kg) remain scattered and variably reported. Methods: We performed a systematic review registered on PROSPERO (CRD420250650291) and conducted per PRISMA guidelines. Six databases (Medline, Embase, Web of Science, Scopus, Cinahl, Cochrane) were searched initially up to May 2024. An updated search was conducted to include studies till June 2025. Eligible studies included prospective or retrospective cohorts or randomized trials evaluating low-dose PTCy in haplo-SCT recipients reporting on acute/chronic GvHD, overall survival (OS), relapse-free survival (RFS), immune reconstitution, or complications such as hemorrhagic cystitis or infections. Non-comparative studies, reviews, and abstracts were excluded. Data was extracted independently by two reviewers, and risk-of-bias (ROB) was assessed using ROBINS-I and Cochrane RoB-2 tools. Results: Thirty-three studies, including 31 observational studies and 2 randomized controlled trials (RCTs), encompassing over 2500 patients, met our eligibility criteria. Most studies originated from Asia, with smaller contributions from Europe, the United States, India and Latin America. Low-dose PTCy regimens ranged from 14.5 to 80 mg/kg, commonly administered as 50 mg/kg ×1 on day +3 or 40 mg/kg ×2 on days +3 and +4. Comparators included standard-dose PTCy (100 mg/kg), ATG-based prophylaxis, or other regimens. Median follow-up ranged from 4 months to over 5 years. Acute GvHD (grades II–IV) rates in low-dose PTCy arms ranged from 9% to 34%. Most observational data showed comparable or reduced incidence of aGvHD compared to controls. Chronic GvHD outcomes varied from 8-46% and showed no clear benefit of dose reduction in most studies.Two-year OS ranged widely from 47% to 100%, with some observational studies favoring low-dose PTCy but others showing no survival advantage. RFS was similarly variable. Hemorrhagic cystitis occurred in 3–33% of patients, with no clear dose-dependent pattern. Infections were inconsistently reported, but, when data were available, viral infections, including BK virus, CMV, and EBV reactivation, were common, with no consistent dose-dependent trend. Median time to immune reconstitution was slightly shorter in some cohorts, but clinical relevance remains uncertain. Two studies reported significantly reduced incidence of cardiac complications with lower PTCy exposure. One randomized controlled trial comparing 80 mg/kg PTCy + ATG with the Beijing Protocol reported significantly reduced aGvHD (11.5% vs. 39.3%, p=0.001) and better OS (75.4% vs. 54.1%, p = 0.021) and RFS ((72.7% vs. 55.0%, p = 0.044)) in the experimental arm. In contrast, the only other randomized study used ultra-low-dose PTCy (14.5 mg/kg ×2) vs. ATG and found no significant difference in acute GvHD (18.2% vs. 18.2%, p=0.996) or survival and was stopped early because of futility. Both RCTs showed comparable rates of cGvHD, toxicity, and immune reconstitution.Importantly, 87% of observational studies had a serious or critical ROB. Both RCTs had some concerns of bias due to inadequate allocation concealment and open-label design but were otherwise at low ROB. Conclusions: Low-dose PTCy for GvHD prophylaxis in haplo-SCT carries comparable or lower rates of acute GvHD, similar chronic GvHD incidence, and non-inferior survival outcomes in many studies. Marked heterogeneity in regimens, patient populations, high ROB, and selective reporting preclude definitive conclusions. Randomized trials must focus on identifying subgroups benefiting from de-escalated PTCy. Until then, low-dose PTCy remains a promising but investigational alternative in haploidentical transplantation.

Abstract Background Translocation of chromosomes 4 and 14 (t(4;14)) results in overexpression of MMSET and has been associated with poor clinical outcomes in patients (pts) with multiple myeloma (MM). KTX-1001 is a first-in-class, potent, and selective oral inhibitor of MMSET (also known as NSD2) developed as the first investigational therapy to directly target the high-risk t(4;14) translocation, a key molecular driver in MM. KTX-1001 binds to and inhibits the catalytic SET domain of MMSET, thereby suppressing the deposition of dimethylated histone H3 lysine 36 (H3K36me2), leading to downregulation of oncogenic histone modifications and epigenetic reprogramming of malignant plasma cells. Preclinically, KTX-1001 synergistically inhibited cell viability in MM cell lines when combined with a proteasome inhibitor (PI), immunomodulatory drug (IMiD), or cereblon E3 ligase modulator (CELMoD™). Preliminary findings were previously reported from the initial cohort of 18 pts enrolled in a first-in-human phase 1 trial evaluating KTX-1001 in relapsed/refractory multiple myeloma (RRMM; NCT05651932; Bories et al. Blood. 2024;144[Suppl 1]:3370). Here, we present updated results from this study. Methods RRMM pts who received ≥3 prior therapies, including PI, IMiD and anti-CD38 monoclonal antibody (anti-CD38 mAb), received oral KTX-1001 across 9 dose levels using a 3+3 dose-escalation design. Primary objective was to determine the recommended Phase 2 dose (RP2D) and the maximum tolerated dose (MTD). Secondary objectives included pharmacokinetics, pharmacodynamics (PD), and primary efficacy. The dose expansion phase has been initiated to evaluate KTX-1001 in combination with either carfilzomib or the investigational CELMoD™ mezigdomide in t(4;14) RRMM pts. Results As of 13 June 2025, 40 pts have been treated in the monotherapy dose-escalation phase. The maximum tolerated dose (MTD) was exceeded due to dose-limiting toxicities (DLTs) in 2 pts: two Grade (Gr) 4 thrombocytopenia and one Gr 3 epistaxis. Backfill at selected dose levels is ongoing to further characterize safety profile and refine dose optimization. The median time from initial MM diagnosis was 8 years (range:2-20) with a median of 6.5 prior lines of therapy (range: 3-25). This included stem cell transplant (70%), BCMA CAR-T (42.5%), and non-CAR-T BCMA targeted drugs such as antibody-drug conjugates and bispecific antibodies (57.5%). The median age was69 years (range:50-83); 21 were female and 19 were male. Extra-medullary disease was present in 13 (32.5%) pts. Nineteen (47.5%) pts had t(4;14) translocation, 5 (12.5%) had 1q21 gain and 4 (10%) had deletion 17p. A total of 16 (40%) pts have shown a treatment response according to IMWG criteria or have achieved stable disease: 1 VGPR (10+ months), 1 PR (4+ months), 2 MR (3+ and 12 months), 12 SD (2-20+ months). KTX-1001 has demonstrated a favorable tolerability profile. Grade 3 or higher treatment-emergent adverse events (TEAEs) were reported in 31 (77.5%) pts. The most frequent (≥20% pts) Gr 3/4 TEAEs were thrombocytopenia in 12 pts (30%; grade 4 in 8 [20%]), neutropenia in 12 pts (30%; febrile neutropenia in 2 [5%]), anemia in 10 (25%) pts. Gr 3 infections were observed in 5 (12.5%) pts and fatigue in 5 (10%) pts. The main reason for treatment discontinuation was progressive disease (57.5%), other pts discontinued due to physician decision (5%), consent withdrawal (5%), and one pt due to adverse event. Twelve (30%) pts remain on treatment. At Cycle 1 Day 15, drug exposure and steady-state concentrations of KTX-1001 increased with dose. A dose-dependent reduction in H3K36me2, the primary PD marker of KTX-1001 activity, was observed in peripheral blood at Cycle 2 Day 1 and beyond, which plateaued above dose-level 4. Paired bone marrow samples further confirmed on-target PD effects, with a marked reduction in H3K36me2 levels in MM cells at Cycle 2 Day 1 with observed anti-MM effect of reduced proliferation of MM cells with concomitant increased proliferation in immune cells in pts achieving clinical benefit. ConclusionsKTX-1001 is a novel agent showing tolerable safety profile in RRMM and demonstrating promising single agent activity in heavily pretreated, triple class refractory RRMM including those with high-risk features. KTX is currently evaluated in ongoing study in combination with carfilzomib and the investigational CELMoD™ mezigdomide in t(4;14) RRMM pts.

Abstract Introduction: Aplastic anemia (AA) affects approximately 1 in a million people per year in the United States and can present as a new diagnosis, progression, or relapse during pregnancy. Due to the rarity of the disease, there are limited data on its clinical presentation, hematologic parameters, treatment strategies, and maternal-fetal outcomes to guide diagnosis and management. Methods: We conducted a comprehensive literature review using PubMed, Google Scholar, and ScienceDirect to identify peer-reviewed studies published between 2001 and 2024. Articles were selected based on relevance and availability of clinical outcome data. We included cases of AA that were active during pregnancy—newly diagnosed, relapsed, or persistent. Data collected included patient demographics (age, sex), AA status (blood counts, disease severity, timing of presentation, management, and complications), fetal outcomes (gestational age and mode of delivery), and birth complications. Results: A total of 53 cases of AA during pregnancy were identified. Of these, 12 were diagnosed during pregnancy and 11 prior to pregnancy. For the 12 cases that developed during pregnancy, diagnoses were made across all trimesters: first (n=6), second (n=4), and third (n=2). Notably, in one patient, AA was active during the third and fourth pregnancies but not during the first or second, suggesting that AA can present intermittently across pregnancies in the same individual. The timing of diagnosis was unspecified in the remaining 30 cases. The median maternal age at AA diagnosis was 26.5 years (range: 19–38), and the median gestational age at birth was 37 weeks (range: 31–40). Among cases where timing was reported, 21% were diagnosed before pregnancy and 23% during pregnancy. Severity was reported in all 53 cases: 72% were classified as non-severe, 26% as severe, and 2% as very severe. Cesarean section was the primary delivery method in 66% of cases. At the time AA was diagnosed or active during pregnancy, median laboratory values were: hemoglobin 7.3 g/dL (range: 3.0–11.8), platelet count 26 × 10⁹/L (range: 8.0–103), and absolute neutrophil count 1.0 × 10⁹/L (range: 0.4–4.0). Maternal and fetal outcomes were reported in 60% and 59% of cases, respectively. Maternal complications included gestational hypertension (6%), gestational diabetes mellitus (6%), infections (23%), and bleeding (26%). Fetal outcomes were generally favorable, with approximately 57% of infants reported as healthy at birth. However, adverse outcomes such as preterm delivery (19%), intrauterine growth restriction (6%), low birth weight (6%), and neonatal intensive care unit admission (9%) were also observed. Maternal and fetal mortality occurred in 4% and 2% of cases, respectively. Treatments administered during pregnancy included red blood cell transfusions (17%), platelet transfusions (17%), and cyclosporine (15%). In the postpartum period, some patients required additional therapies: antithymocyte globulin (4%), eltrombopag (6%), and hematopoietic stem cell transplantation (8%). Conclusion: Aplastic anemia during pregnancy remains rare and clinically complex, with variable timing, severity, and outcomes. Our review underscores the need for early recognition and multidisciplinary management to reduce risks to both mother and fetus. The observation that AA may occur in some pregnancies but not others within the same individual raises important questions about underlying disease mechanisms. Broader, systematic studies are needed to clarify these patterns and to inform safer, more effective treatment strategies during pregnancy.