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FDA Grants Accelerated Approval to Epcoritamab-bysp for Relapsed or Refractory Diffuse Large B-Cell Lymphoma and High-Grade B-Cell Lymphoma

Evidence for efficacy is based on the results from the EPCORE NHL-1 study
30 May 2023

On 19 May 2023, the US Food and Drug Administration (FDA) granted accelerated approval to epcoritamab-bysp (Epkinly, Genmab US, Inc.) for relapsed or refractory diffuse large B-cell lymphoma (DLBCL) not otherwise specified, including DLBCL arising from indolent lymphoma, and high-grade B-cell lymphoma after two or more lines of systemic therapy.

Full prescribing information for Epkinly is available here.

Epcoritamab-bysp, a bispecific CD20-directed CD3 T-cell engager, was evaluated in EPCORE NHL-1 (NCT03625037), an open-label, multi-cohort, multicentre, single-arm study in patients with relapsed or refractory B-cell lymphoma. The efficacy population consisted of 148 patients with relapsed or refractory DLBCL, not otherwise specified, including DLBCL arising from indolent lymphoma, and high-grade B-cell lymphoma after two or more lines of systemic therapy, including at least one anti-CD20 monoclonal antibody-containing therapy.

The main efficacy outcome measure was overall response rate (ORR) determined by Lugano 2014 criteria, as assessed by an Independent Review Committee. The ORR was 61% (95% confidence interval [CI] 53, 69) with 38% of patients achieving complete responses. With a median follow-up of 9.8 months among responders, the estimated median duration of response was 15.6 months (95%CI 9.7, not reached).

The prescribing information has a Boxed Warning for serious or life-threatening cytokine release syndrome (CRS) and life-threatening or fatal immune effector cell-associated neurotoxicity syndrome (ICANS). Warnings and precautions include infections and cytopenias. Among the 157 patients with relapsed or refractory large B-cell lymphoma who received epcoritamab-bysp at the recommended dose, CRS occurred in 51% of patients, ICANS in 6%, and serious infections in 15%. For CRS, grade 1 occurred in 37% of patients, grade 2 in 17%, and grade 3 in 2.5%. For ICANS, grade 1 occurred in 4.5%, grade 2 in 1.3%, and grade 5 in 0.6%.

Epcoritamab-bysp should only be administered by a qualified healthcare professional with appropriate medical support to manage severe reactions such as CRS and ICANS. Because of the risk of CRS and ICANS, patients should be hospitalised for 24 hours after the cycle 1 day 15 dosage of 48 mg.

The most common (≥20%) adverse reactions were CRS, fatigue, musculoskeletal pain, injection site reactions, pyrexia, abdominal pain, nausea, and diarrhoea. The most common grade 3 to 4 laboratory abnormalities (≥10%) were decreased lymphocyte count, decreased neutrophil count, decreased white blood cell count, decreased haemoglobin, and decreased platelets.

The recommended regimen consists of epcoritamab-bysp administered subcutaneously in 28-day cycles until disease progression or unacceptable toxicity. The recommended dose is step-up dosing in cycle 1 (0.16 mg on day 1, 0.8 mg on day 8, and 48 mg on day 15 and day 22) followed by fixed dosing of 48 mg weekly dosing during cycles 2 through 3, every other week during cycle 4 through 9, and then every four weeks on day 1 of subsequent cycles.

This review used the Assessment Aid, a voluntary submission from the applicant to facilitate the FDA’s assessment.

This application was granted priority review.

Healthcare professionals should report all serious adverse events suspected to be associated with the use of any medicine and device to FDA’s MedWatch Reporting System.

For assistance with single-patient INDs for investigational oncology products, healthcare professionals may contact FDA’s Oncology Center of Excellence Project Facilitate.

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