The US Food and Drug Administration (FDA) has approved lifileucel (Amtagvi, Iovance Biotherapeutics, Inc.) for the treatment of certain adults with unresectable or metastatic melanoma, marking the first approval of a cellular therapy in the solid tumor setting.
Specifically, the tumor-derived autologous T-cell immunotherapy is indicated for adult patients previously treated with a programmed cell death protein 1 (PD-1)–blocking antibody, and if BRAF V600–positive, a BRAF inhibitor with or without an MEK inhibitor.
The approval “offers hope to those with advanced melanoma who have progressed following initial standard of care therapies, as the current treatment options are not effective for many patients,” Samantha R. Guild, JD, president, AIM at Melanoma Foundation, stated in a press release. “This one-time cell therapy represents a promising innovation for the melanoma community, and we are excited by its potential to transform care for patients who are in dire need of additional therapeutic options.”
The approval was based on findings from the open-label single-arm global C-144-01 clinical trial, which showed an objective response rate of 31.5% in 73 patients treated within the recommended dosing rage of 7.5 x 109 to 72 x 109 viable cells. Complete responses occurred in three patients (4.1%) and partial responses occurred in 20 patients (27.4%)
Median duration of response was not reached at 18.6 months of follow-up. The median time to initial response to the therapy was 1.5 months, according to an FDA press release.
“Unresectable or metastatic melanoma is an aggressive form of cancer that can be fatal,” Peter Marks, MD, PhD, director of the FDA’s Center for Biologics Evaluation and Research stated in the FDA release. “The approval of Amtagvi represents the culmination of scientific and clinical research efforts leading to a novel T cell immunotherapy for patients with limited treatment options.”
“The melanoma community is so grateful to the patients, caregivers, and clinicians who have made the clinical trials of this therapy possible and got lifileucel to approval,” Allison Betof Warner, MD, PhD, director of Melanoma Medical Oncology at Stanford Medicine, wrote on X. “We are very excited to bring this life-saving therapy to patients ASAP! Available immediately at @StanfordCancer!!!”
For the C-144-01 trial, lifileucel was administered after a lymphodepletion regimen of 60 mg/kg/d of cyclophosphamide for 2 days followed by 25 mg/m2/d of fludarabine for 5 days. Between 3 and 34 hours after infusion, patients received 600,000 IU/Kg of the interleukin 2 aldesleukin every 8-12 hours for up to six doses to support cell expansion in vivo.
The full prescribing information for lifileucel contains a boxed warning for treatment-related mortality, prolonged severe cytopenia, severe infection, cardiopulmonary, and renal impairment. The most common adverse reactions, which occurred in at least 20% of patients, were chills, pyrexia, fatigue, tachycardia, diarrhea, febrile neutropenia, edema, rash hypotension, alopecia, infection, hypoxia, and dyspnea.
“Patients receiving this product should be closely monitored before and after infusion for signs and symptoms of adverse reactions. Treatment should be withheld or discontinued in the presence of these symptoms, as indicated,” according to the FDA statement.
Sharon Worcester, MA, is an award-winning medical journalist based in Birmingham, Alabama, writing for Medscape, MDedge and other affiliate sites. She currently covers oncology, but she has also written on a variety of other medical specialties and healthcare topics. She can be reached at sworcester@mdedge.com or on Twitter: @SW_MedReporter.
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