plamotamab (XmAb13676) / Xencor - LARVOL DELTA

Phase 1 Study of Plamotamab, a Bispecific CD20xCD3 T-cell Engager, In Adult Patients With Rheumatoid Arthritis: Interim Results (ACR Convergence 2026) - No abstract available

Bispecific • Clinical • P1 data • Immunology • Inflammatory Arthritis • Rheumatoid Arthritis • Rheumatology

Plamotamab (CD20 x CD3), a clinical-stage, B-cell depleting bispecific T-cell engager in Phase 1 development for patients with rheumatoid arthritis (RA), who have progressed through prior standard-of-care treatment (Businesswire) - "Xencor plans to provide an update on progress achieved in the Phase 1b study of plamotamab in RA in 2H26."

P1 data • Rheumatoid Arthritis

Wholly Owned Pipeline Overview:…Plamotamab (CD20 x CD3) (Businesswire) - "Xencor plans to provide an update on progress achieved in the Phase 1b study of plamotamab in RA in 2H26."

P1 data • Rheumatoid Arthritis

A Phase 1b Open-label Study to Evaluate Safety of Plamotamab in Participants With Rheumatoid Arthritis (clinicaltrials.gov) - P1 | N=68 | Recruiting | Sponsor: Xencor, Inc. | N=47 ➔ 68

Enrollment change • Immunology • Inflammatory Arthritis • Rheumatoid Arthritis • Rheumatology

Xencor Reports Fourth Quarter and Full Year 2025 Financial Results (Xencor Press Release) - "Xencor plans to provide an update on progress achieved in the Phase 1b study of plamotamab in RA in 2H26...Xencor plans to provide an update on progress achieved in the Phase 1 study of XmAb657 in 2H26."

Trial status • Inflammation • Myositis • Rheumatoid Arthritis

Xencor is evaluating plamotamab in an ongoing Phase 1b proof-of-concept study, for patients with RA who have progressed through prior standard-of-care treatment. (FinancialContent) - "Provide an update on progress achieved in the Phase 1b study of plamotamab in RA in 2H26."

Trial status • Rheumatoid Arthritis

A Phase 1 Open-label Study to Evaluate Safety in Healthy Participants and Participants With Idiopathic Inflammatory Myopathy (IIM) (clinicaltrials.gov) - P1 | N=27 | Not yet recruiting | Sponsor: Xencor, Inc.

First-in-human • New P1 trial • Myositis

Outcomes and treatment patterns of patients with primary mediastinal b-cell lymphoma after CAR-t cell therapy failure : A descar-t analysis (ASH 2025) - P | "Of these, 14 (52%) received axi-cel, 11 (40%)tisa-cel, and 2 (7%) liso-cel...Salvage treatments included checkpointinhibitors (CPI, pembrolizumab or nivolumab) in 11 pts, with four of them received also brentuximab-vedotin; chemotherapy in 1 patient (Rituximab-bendamustine + polatuzumab-vedotin); anti-CD3/CD20bispecific antibodies in 6 pts (glofitamab, epcoritamab or plamotamab); and various others therapy in 4pts... This study outlines the treatment features and outcomes of pts with PMBL who relapseafter CAR-T cell therapy and highlights the potential of CPIs as a preferred treatment option followingCAR-T cell failure. Given the young age of most pts and the frequent off-label use of CPIs across manycountries, these findings emphasize the importance of a structured, multidisciplinary expert approach tosupport timely and individualized management decisions in this rare but potentially curable population."

CAR T-Cell Therapy • Clinical • B Cell Lymphoma • Diffuse Large B Cell Lymphoma • Hematological Malignancies • Lymphoma • Mediastinal B Cell Lymphoma • Non-Hodgkin’s Lymphoma • Primary Mediastinal Large B-Cell Lymphoma

A Phase 1b Open-label Study to Evaluate Safety in Participants With Rheumatoid Arthritis (clinicaltrials.gov) - P1 | N=47 | Recruiting | Sponsor: Xencor, Inc.

New P1 trial • Immunology • Inflammatory Arthritis • Rheumatoid Arthritis • Rheumatology

Risk Factors for Severe Infection in Patients Receiving Bispecific Antibody Therapies for Lymphoma (ASH 2024) - "We evaluated characteristics of infection including time to infection, time from last treatment of bendamustine, autologous SCT, or CAR-T to infection, and outcomes after infection...17 R/R patients received BsAb as combination therapy with Polatuzumab-CHP (n=5), R-DHAOx (n=3), GemOx (n=3), lenalidomide (n=5), or RCHOP (n=1)...Patients were treated with epcoritamab (n=39), glofitamab (n=11), mosunetuzumab (n=16), and plamotamab (n=18)...Our study confirms that patients receiving BsAb have a high risk of severe infections, even in patients treated in the frontline setting or while on prophylaxis. Multivariate analysis showed no difference in risk of severe infection with regards to combination therapy, histology, product, or previous treatment and further research with larger cohorts is warranted to fully understand risk factors for infection in this high risk patient population."

Clinical • Diffuse Large B Cell Lymphoma • Hematological Malignancies • Herpes Zoster • Infectious Disease • Lymphoma • Nephrology • Non-Hodgkin’s Lymphoma • Oncology • Pneumonia • Respiratory Diseases • Richter's Syndrome • Varicella Zoster • CD20

Plamotamab: First Presentation of Subcutaneous Administration in a Phase 1 Dose Escalation Study in Heavily Pretreated R/R NHL Patients Who Had Prior CAR-T Cell Therapy (ASH 2024) - P1 | "SC dosing had favorable PK with Cmax lower than IV administration, with lower incidence and severity of CRS after the 1st step-up dose. Plamotamab is an active and tolerable drug for further development in CD20+ disease."

CAR T-Cell Therapy • Clinical • P1 data • Acute Respiratory Distress Syndrome • Anemia • B Cell Lymphoma • B Cell Non-Hodgkin Lymphoma • Cardiovascular • Congestive Heart Failure • Diffuse Large B Cell Lymphoma • Fatigue • Heart Failure • Hematological Disorders • Hematological Malignancies • High-grade B-cell lymphoma • Infectious Disease • Lymphoma • Lymphoplasmacytic Lymphoma • Mantle Cell Lymphoma • Neutropenia • Non-Hodgkin’s Lymphoma • Oncology • T Cell Non-Hodgkin Lymphoma • Waldenstrom Macroglobulinemia • CD20

Risk Factors for Cytokine Release Syndrome in Patients Receiving Bispecific Antibodies for B-Cell Lymphoma: A Single-Center, Retrospective Cohort Study (ASH 2024) - "Patients were treated with epcoritamab (Epco) (n=39, 46.4%), glofitamab (Glofit) (n=11, 13.1%), plamotamab (Plamo) (n=18, 21.4%) and mosunetuzumab (Mosun) (n=16, 19.1%)...CRS was managed with additional steroids in 14 patients (29.2%) and tocilizumab in 15 patients (31.3%)...Inflammatory marker levels, prior CAR-T, and prior bendamustine did not impact the risk of CRS. Further studies in larger data sets are needed to identify patients of high CRS risk to allow for early management, and of low risk to allow for treatment in the outpatient setting."

Cytokine release syndrome • IO biomarker • Retrospective data • B Cell Lymphoma • B Cell Non-Hodgkin Lymphoma • Diabetes • Diffuse Large B Cell Lymphoma • Follicular Lymphoma • Hematological Malignancies • Lymphoma • Mantle Cell Lymphoma • Metabolic Disorders • Non-Hodgkin’s Lymphoma • Oncology • Richter's Syndrome • CRP

Xencor is evaluating plamotamab in a Phase 1b proof-of-concept study, for patients with RA who have progressed through prior standard-of-care treatment (Businesswire) - "The first patient has been dosed in the study, and enrollment is ongoing."

Trial status • Rheumatoid Arthritis

Xencor Reports Second Quarter 2025 Financial Results (Businesswire) - "Clinical Program Updates:...Autoimmune & Inflammatory Diseases:...(i) Xencor is evaluating plamotamab in a Phase 1b/2a proof-of-concept study, for patients with RA have progressed through prior standard-of-care treatment. In June 2025, Xencor received regulatory authorization to proceed with the study...; (ii) Xencor recently initiated the global XENITH-UC Study, a Phase 2b study of XmAb942 in ulcerative colitis (UC). XENITH-UC is a randomized, double-blind, placebo-controlled trial in patients with moderate-to-severe UC, whose disease has progressed after at least one conventional or advanced therapy."

Trial status • Rheumatoid Arthritis • Ulcerative Colitis

Comparative analysis of adverse event profiles for CAR-T cell therapies and bispecific antibodies in lymphoma. (ASCO 2025) - " A retrospective analysis was conducted using the FAERS database to assess AE reports associated with CAR-T therapies (Breyanzi, Kymriah, Yescarta, and Tecartus) and BsAbs (Epcoritamab, Glofitamab, Odronextamab, Mosunetuzumab, and Plamotamab). This analysis highlights key differences in the safety profiles of CAR-T and BsAb therapies for lymphoma. CAR-T therapies were associated with a higher incidence of neurological and psychiatric AEs, while BsAbs demonstrated a greater risk of infections. These findings may offer valuable guidance for clinicians in therapy selection and underscore the importance of vigilant monitoring, particularly for neurological toxicities in CAR-T treatments and infection-related risks with BsAbs."

Adverse events • CAR T-Cell Therapy • CNS Disorders • Hematological Malignancies • Infectious Disease • Lymphoma • Mental Retardation • Musculoskeletal Diseases • Oncology • Psychiatry

ADVANCING NURSING KNOWLEDGE OF CD20-CD3 BISPECIFIC ANTIBODY TREATMENT FOR B-CELL NON-HODGKIN LYMPHOMA IN AUSTRALIA: A SCOPING REVIEW OF ADVERSE EVENTS TO INFORM PRACTICE (ICML 2025) - "Six BsAbs were identified: epcoritamab, glofitamab, imvotamab, mosunetuzumab, odronextamab and plamotamab...Supportive management, tocilizumab and corticosteroids were used for the treatment of CRS... BsAbs represent an effective treatment option in B-NHL with a unique side-effect profile. Some agents are now available through compassionate access programs in Australia and are increasingly encountered in routine practice around the world. This is the first published scoping review to synthesize evidence from clinical trials of BsAbs for nursing practice, informing nurses of the most common AEs and nursing led interventions for safe delivery and informed the development of an education package."

Adverse events • Review • B Cell Non-Hodgkin Lymphoma • Hematological Malignancies • Lymphoma • Non-Hodgkin’s Lymphoma • Oncology • CD20

Upcoming Clinical Study Initiation Plans (Businesswire) - "Xencor plans to evaluate plamotamab in RA, in which patients have progressed through prior standard-of-care treatment and initiate a Phase 1b/2a proof-of-concept study in the first half of 2025. The Phase 1b portion of the study will select a priming and step-up dose regimen based on the regimen established in oncology and will assess the initial safety, efficacy, and biomarkers of plamotamab in patients with RA. The selected dose regimen will then be evaluated in the randomized Phase 2a portion, with efficacy determined at week 12."

New P1/2 trial • Rheumatoid Arthritis

XmAb13676-01: Study to Evaluate Safety and Tolerability of XmAb13676 (Plamotamab) in Patients With CD20-expressing Hematologic Malignancies (clinicaltrials.gov) - P1 | N=154 | Completed | Sponsor: Xencor, Inc. | Active, not recruiting ➔ Completed | N=270 ➔ 154 | Trial completion date: Jan 2025 ➔ Apr 2024 | Trial primary completion date: Oct 2024 ➔ Apr 2024

Enrollment change • Trial completion • Trial completion date • Trial primary completion date • Chronic Lymphocytic Leukemia • Follicular Lymphoma • Hematological Disorders • Hematological Malignancies • Indolent Lymphoma • Leukemia • Lymphoma • Non-Hodgkin’s Lymphoma • Oncology

Xencor Reports Third Quarter 2024 Financial Results (Businesswire) - "Internal Clinical-Stage Program Updates:...Plamotamab (CD20 x CD3): Xencor previously completed a Phase 1 clinical study of plamotamab in hematologic cancers. Data from subcutaneous dosing cohorts in patients with relapsed or refractory non-Hodgkin’s lymphoma will be presented at the 66th American Society of Hematology Annual Meeting in a poster titled 'First Presentation of Subcutaneous Administration in a Phase 1 Dose Escalation Study in Heavily Pretreated R/R NHL Patients Who Had Prior CAR-T Cell Therapy'."

P1 data • Non-Hodgkin’s Lymphoma

Safety and Efficacy of Bispecific Antibodies in Adults with Large B-Cell Lymphomas: A Systematic Review of Clinical Trial Data. (PubMed, Int J Mol Sci) - "BsAbs appear to have superior tolerability, but inferior efficacy to CAR T-cell therapies in adults with LBCL. Future research on safety and efficacy should focus on evaluating adverse event timing and management, the impact on the patient's quality of life, the burden on the healthcare system, and overall survival outcomes."

Journal • Review • Diffuse Large B Cell Lymphoma • Hematological Disorders • Hematological Malignancies • Infectious Disease • Lymphoma • Neutropenia • Non-Hodgkin’s Lymphoma • Oncology • Thrombocytopenia

Xencor Regains CD20 x CD3 Bispecific T-Cell Engager (Businesswire) - "Xencor, Inc...announced it will regain exclusive worldwide rights to plamotamab, a CD20 x CD3 bispecific T-cell engager, which Xencor advanced through Phase 1 clinical development in hematologic cancers. In 2021, Xencor entered a collaboration and license agreement with Janssen Biotech, Inc. to develop and commercialize plamotamab and novel B-cell targeting bispecific antibodies designed to conditionally activate T cells through the CD28 co-stimulatory receptor....Xencor has been notified that Janssen will terminate its rights to plamotamab under the collaboration and license agreement. Janssen has retained its rights to develop and commercialize B-cell targeting CD28 bispecific antibodies, including JNJ-9401 (PSMA x CD28) and JNJ-1493 (CD20 x CD28)."

Licensing / partnership • Hematological Malignancies • Leukemia • Lymphoma • Metastatic Castration-Resistant Prostate Cancer • Non-Hodgkin’s Lymphoma • Oncology • Prostate Cancer • Solid Tumor

XmAb13676-01: Study to Evaluate Safety and Tolerability of XmAb13676 (Plamotamab) in Patients With CD20-expressing Hematologic Malignancies (clinicaltrials.gov) - P1 | N=270 | Active, not recruiting | Sponsor: Xencor, Inc. | Recruiting ➔ Active, not recruiting

Enrollment closed • Chronic Lymphocytic Leukemia • Follicular Lymphoma • Hematological Disorders • Hematological Malignancies • Indolent Lymphoma • Leukemia • Lymphoma • Non-Hodgkin’s Lymphoma • Oncology

SAFETY AND EFFICACY OF ANTICD20-CD3 BISPECIFIC T-CELL ENGAGING ANTIBODIES IN THE MANAGEMENT OF RELAPSED/REFRACTORY DIFFUSE LARGE B-CELL LYMPHOMA: A SYSTEMATIC REVIEW OF CLINICAL TRIALS (EHA 2023) - "In the trials, mosunetuzumab, glofitamab, epcoritamab, odronextamab, IGM-2323, and plamotamab were identified as antiCD20-CD3 bsAbs, which are evaluated against RRDLBCL as monotherapy and in combination regimens (Table). Based on our analysis , antiCD20-CD3 bsAbs are safe and efficacious. Among these drugs, glofitamab, epcoritamab and odronextamab as monotherapy and/or in combination regimens are the most effective therapies against RRDLBCL. Drug (s) **Author Efficac y ORR, CR per Lugano/RR C for ML criteria **CRS Overall/G 3 per ASTCT/ Lee et al criteria Overall Toxicity G≥3 per CTCAE CNS Toxicity G≥3 Per CTCAE aNHL 35%Mosun IV Budde et al."

Clinical • Review • Diffuse Large B Cell Lymphoma • Hematological Disorders • Hematological Malignancies • Infectious Disease • Lymphoma • Non-Hodgkin’s Lymphoma • Oncology

The evolving therapy of DLBCL: Bispecific antibodies (ICML 2023) - "In a small, randomised phase 2 study, complete response (CR) was seen in 40% of patients in PV-BR group, compared to 17% of patients in the BR group, leading to what appeared to be a PFS plateau around 30% at 2 years for the novel combination.6 L-MIND, a phase 2 study of the combination of the anti-CD19 antibody tafasitamab and lenalidomide showed a similar CR rate of 40% in r/r DLBCL patients, and these responses were highly durable.7 Even though this study seems to have included an unusually good-risk patient group, the combination of tafasitamab and lenalidomide has been approved for r/r DLBCL in the United States ad the European Union, as well as the combination of PV and BR. Other novel agents have also been approved based on data from phase 2 studies; the selective nuclear export inhibitor Selinexor and the anti-CD19 ADC loncastuximab tesirine, which led to CR in 12% and 24% of patients, respectively.8, 9 Despite these considerable improvements, the most..."

IO biomarker • Diffuse Large B Cell Lymphoma • Oncology • CD22 • CD79B • CD8 • FCGR3A • PD-1

[VIRTUAL] Approaches to Therapy of Richter Syndrome (SOHO 2021) - P2 | "Hematologic toxicity was reported in 65% of patients, with infections as most common severe non-hematologic toxicity in 28% of patients.29 The reported ORR in a retrospective series of 48 patients with DLBCL-RT is 37%, with a median OS of 35 months.30 The anti-CD20 ofatumumab (O) was also combined with CHOP showing an ORR of 46% (CR 27%, PR 19%) with a median PFS of 6 months and a median OS of 11 months. As for R-CHOP, infections and hematologic toxicities (thrombocytopenia, febrile neutropenia, sepsis) were the main adverse events.31,32 Due to its indication in MYC rearranged de novo DLBCL, R-EPOCH (rituximab, etoposide, prednisone, vincristine, cyclophosphamide, and doxorubicin) was investigated in RTDLBCL showing an ORR of 20%, a median PFS of 3 months and a median OS of 6 months, with worse PFS and OS in patients with underlying deletion 17p and complex karyotype. Febrile neutropenia and infections were reported as main toxicities.33 Response rates of ~40% with..."

IO biomarker • Chronic Lymphocytic Leukemia • Diffuse Large B Cell Lymphoma • Hodgkin Lymphoma • Non-Hodgkin’s Lymphoma • Oncology • Richter's Syndrome • Small Lymphocytic Lymphoma • CDKN2A • CSF2 • FDG PET • NOTCH1 • PLCG2 • TP53