Iovance Announces Five-year Results of Amtagvi® (lifileucel) in Patients with Advanced Melanoma at ASCO Annual Meeting

Rhea-AI Summary

Iovance Biotherapeutics announced five-year results from the Phase 2 C-144-01 trial of Amtagvi® (lifileucel) in advanced melanoma patients. The study included 153 patients previously treated with anti-PD-1 and targeted therapy. Key findings with a median follow-up of 57.8 months include:

• 19.7% five-year survival rate with median overall survival of 13.9 months
• 31.4% objective response rate (5.9% complete responses, 25.5% partial responses)
• 36.5-month median duration of response
• 31.3% of responders maintained ongoing responses at five years

Amtagvi, approved by FDA in February 2024, is the first one-time T cell therapy for solid tumor cancer. The therapy demonstrated a favorable long-term safety profile with no new or late-onset treatment-related adverse events.

Positive

• First-ever one-time cell therapy approved for solid tumor cancer
• 19.7% five-year survival rate in advanced melanoma patients
• Durable response with 36.5-month median duration
• 31.3% of responders maintained responses at 5-year mark
• Favorable long-term safety profile with no new adverse events

Negative

• Moderate objective response rate of 31.4%
• Relatively low complete response rate of 5.9%
• Median overall survival of 13.9 months indicates limited efficacy in non-responding patients

Insights

Oncology Specialist

Amtagvi's 5-year data shows unprecedented durability in advanced melanoma with 20% survival rate, validating FDA's accelerated approval decision.

The five-year follow-up data for Amtagvi (lifileucel) represents a significant milestone in solid tumor immunotherapy. The 19.7% five-year survival rate is particularly remarkable given the patient population had already progressed on both anti-PD-1 therapy and targeted therapy where applicable - a heavily pretreated group with historically poor outcomes.

The durability metrics are especially compelling: 31.4% objective response rate with 5.9% complete responses and a median duration of response of 36.5 months. Most striking is that nearly a third of responders maintained their responses through the entire five-year assessment period, suggesting potentially curative outcomes in some patients.

The median OS of 13.9 months may seem modest, but must be contextualized against the refractory nature of this patient population. The long tail of survivors at five years suggests Amtagvi is providing meaningful clinical benefit for a subset of patients who otherwise had exhausted standard treatment options.

The safety profile shows no concerning late-onset toxicities, which is critical for cell therapies where long-term safety remains a key question. The front-loaded toxicity profile, primarily associated with the lymphodepletion regimen and IL-2, aligns with what we typically see with cellular immunotherapies.

As the first FDA-approved one-time cell therapy for solid tumors, these long-term data further validate the regulatory decision for accelerated approval and strengthen Amtagvi's clinical positioning in the advanced melanoma treatment landscape. The ongoing Phase 3 TILVANCE-301 trial in frontline melanoma will be crucial to potentially expand Amtagvi's label and determine if earlier intervention with TIL therapy might yield even more impressive long-term outcomes.

One-time Amtagvi Treatment Demonstrated Durable Responses and a Five-year Overall Survival Rate of 20%

Five-year Follow Up is Unprecedented for Any Therapy in Patients with Advanced Melanoma Previously Treated with Immune Checkpoint Inhibitor

SAN CARLOS, Calif., May 22, 2025 (GLOBE NEWSWIRE) -- Iovance Biotherapeutics, Inc. (NASDAQ: IOVA), a commercial biotechnology company focused on innovating, developing, and delivering novel polyclonal tumor infiltrating lymphocyte (TIL) therapies for patients with cancer, today announced five-year results from the Phase 2 C-144-01 clinical trial evaluating the individualized T cell therapy Amtagvi^® (lifileucel).

The C-144-01 trial investigated Amtagvi in patients with advanced melanoma previously treated with anti-PD-1 and targeted therapy, where applicable. The five-year results included meaningful overall survival (OS) results and durable responses following one-time treatment with Amtagvi. These results will be presented at the 2025 American Society of Clinical Oncology (ASCO) Annual Meeting.

The long-term data are from 153 patients combined from cohorts 2 and 4 of the C-144-01 trial. With a median follow-up of 57.8 months, patients achieved a median OS of 13.9 months, with 19.7% of patients surviving at the five-year mark. The objective response rate was 31.4%, including complete responses in 5.9% of patients and partial response in 25.5%. Among patients who responded to treatments, the median duration of response was 36.5 months. Nearly a third of responders (31.3%) completed the five-year assessment with ongoing responses.

Adverse events (AEs) were consistent with known safety profiles of nonmyeloablative lymphodepletion and interleukin-2 administration. The incidence of AEs decreased rapidly within the first two weeks after Amtagvi infusion, and there were no new or late-onset treatment-related AEs.

“As the first one-time cell therapy approved for a solid tumor cancer, Amtagvi offers a compelling and differentiated treatment option, potentially transforming care within the advanced melanoma community,” said Friedrich Graf Finckenstein, M.D., Chief Medical Officer of Iovance. “These five-year data represent the longest follow-up in a multicenter TIL therapy study, reinforcing the deep and lasting responses, and favorable long-term safety with Amtagvi. In addition, we remain committed to realizing the potential of novel T cell therapies for difficult-to-treat solid tumor cancers representing 90 percent of all diagnosed cancers today.”

Additional details will be presented at ASCO:

• Rapid Oral Presentation: Lifileucel in patients with advanced melanoma: 5-year outcomes of the C-144-01 study (Abstract 9515)
  • Session: Melanoma/Skin Cancers, Monday, June 2, 2025, 9:45 am – 11:15 am CDT
• Trial-in-Progress Poster: Phase 2, multicenter study of the lifileucel regimen and pembrolizumab after frontline platinum-doublet chemotherapy and pembrolizumab in advanced non-small cell lung cancer (Abstract TPS8659)
  • Session: Lung Cancer—Non-Small Cell Metastatic, Saturday, May 31, 2025, 1:30 pm – 4:30 pm CDT

Iovance will host a panel discussion on the evening of Saturday, May 31, 2025 at 6:15 pm CDT (7:15 pm EDT) featuring key opinion leaders in melanoma. Please register here to listen to the live audio webcast or replay: https://edge.media-server.com/mmc/p/jerg4puz. The live and archived webcast will be available in the Investors section of the company’s website at www.iovance.com.

In February 2024, the U.S. Food and Drug Administration granted accelerated approval to Amtagvi for the treatment of adult patients with unresectable or metastatic melanoma previously treated with a PD-1 blocking antibody, and if BRAF V600 mutation positive, a BRAF inhibitor with or without a MEK inhibitor. The approval is based on overall response rate and duration of response from the C-144-01 clinical trial. With this approval, Amtagvi became the first one-time T cell therapy for a solid tumor cancer as well as the first treatment option for patients with advanced melanoma after anti-PD-1 and targeted therapy. Iovance is also conducting TILVANCE-301, a Phase 3 trial in frontline advanced melanoma to confirm clinical benefit.

About the C-144-01 Clinical Trial

C-144-01 is a global, multicenter Phase 2 study in which patients received treatment with lifileucel. The study enrolled patients with metastatic melanoma who were previously treated with at least one systemic therapy, including a PD-1 blocking antibody, and if BRAF V600 mutation positive, a BRAF inhibitor or BRAF inhibitor with MEK inhibitor. Efficacy was established on the basis of objective response rate (ORR) and duration of response (DOR) by Independent Review Committee (IRC) per Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1. The pivotal Cohort 4 and supportive Cohort 2 of Study C-144-01 enrolled patients that met the same primary eligibility criteria, had the same assessments, and had received the same regimen and lifileucel that was produced using the same manufacturing process, and product formulation. The detailed results of C-144-01 were published in The Journal for ImmunoTherapy of Cancer in 2022.

About Amtagvi^®

AMTAGVI is a prescription medicine used to treat adults with a type of skin cancer that cannot be removed surgically or has spread to other parts of the body called unresectable or metastatic melanoma.

AMTAGVI is used when your melanoma has not responded or stopped responding to a PD-1 blocking drug either by itself or in a combination, and if your cancer is BRAF mutation positive, a BRAF inhibitor drug with or without a MEK inhibitor drug that has also stopped working.

The approval of AMTAGVI is based on a study that measured response rate. Continued approval for this use may depend on the results of an ongoing study to confirm benefit.

Important Safety Information

What is the most important information that I should know about AMTAGVI?

You will likely be in a hospital prior to and after receiving AMTAGVI.

Before taking AMTAGVI, tell your healthcare provider about all of your medical conditions, including if you:

• Have any lung, heart, liver or kidney problems
• Have low blood pressure
• Have a recent or active infection or other inflammatory conditions including cytomegalovirus (CMV) infection, hepatitis B or C or human immunodeficiency virus (HIV) infection
• Are pregnant, think you may be pregnant, or plan to become pregnant
• Are breastfeeding
• Notice the symptoms of your cancer are getting worse
• Have had a vaccination in the past 28 days or plan to have one in the next few months
• Have been taking a blood thinner

Tell your doctor about all the medications you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements.

How will I receive AMTAGVI?

• AMTAGVI is made from your surgically removed tumor. Tumor derived T cells are grown in a manufacturing center at the end of which they number in the billions of cells.
• Your tumor tissue is sent to a manufacturing center to make AMTAGVI. It takes about 34 days from the time your tumor tissue is received at the manufacturing center until AMTAGVI is available to be shipped back to your healthcare provider, but the time may vary. Your AMTAGVI will be provided in 1-4 patient-specific infusion bag(s) containing 100 mL to 125 mL of viable (alive) cells per bag.
• After your AMTAGVI arrives at your treating institution, your healthcare provider will give you lymphodepleting chemotherapy to prepare your body.
• Approximately 30 to 60 minutes before you are given AMTAGVI, you may be given other medicines including:
  • Medicines for an allergic reaction (anti-histamines)
  • Medicines for fever (such as acetaminophen)
• Your AMTAGVI will be provided in 1 to 4 infusion bag(s) containing 100 mL to 125 mL of viable cells per bag. When your body is ready for AMTAGVI infusion, your healthcare provider will give AMTAGVI to you by intravenous infusion. This usually takes less than 90 minutes.
  

After getting AMTAGVI

Beginning 3 to 24 hours after AMTAGVI is given, you may be given up to 6 doses of IL-2 (aldesleukin) every 8 to 12 hours via intravenous infusion. Your doctor may discontinue IL-2 (aldesleukin) infusion any time if you have severe side effects.

You will have to stay in the hospital until you have completed the IL-2 (aldesleukin) treatment and you have recovered from any serious side effects associated with the AMTAGVI treatment.

You should plan to stay within 2 hours of the location where you received your treatment for several weeks after getting AMTAGVI. Your healthcare provider will check to see if your treatment is working and help you with any side effects that occur.

What are the possible side effects of AMTAGVI?

The most common side effects of the AMTAGVI treatment include chills, fever, low white blood cell count (may increase risk of infections), fatigue, low red blood cell count (may cause you to feel tired or weak), fast or irregular heartbeat, rash, low blood pressure, and diarrhea.

These are not all the possible side effects of the AMTAGVI treatment. Talk with your healthcare provider for more information about AMTAGVI. You can ask your healthcare provider for information about AMTAGVI that is written for healthcare professionals.

You may report side effects to Iovance at 1-833-400-4682, or to the FDA, at 1-800-FDA-1088 or at www.fda.gov/medwatch.

Please see Full Prescribing Information and Patient Information, including Boxed Warning, for additional Important Safety Information.

About Iovance Biotherapeutics, Inc.
Iovance Biotherapeutics, Inc. aims to be the global leader in innovating, developing, and delivering tumor infiltrating lymphocyte (TIL) therapies for patients with cancer. We are pioneering a transformational approach to cure cancer by harnessing the human immune system’s ability to recognize and destroy diverse cancer cells in each patient. The Iovance TIL platform has demonstrated promising clinical data across multiple solid tumors. Iovance’s Amtagvi^® is the first FDA-approved T cell therapy for a solid tumor indication. We are committed to continuous innovation in cell therapy, including gene-edited cell therapy, that may extend and improve life for patients with cancer. For more information, please visit http://www.iovance.com/.

Amtagvi^® and its accompanying design marks, Proleukin^®, Iovance^®, and IovanceCares™ are trademarks and registered trademarks of Iovance Biotherapeutics, Inc. or its subsidiaries. All other trademarks and registered trademarks are the property of their respective owners.

Forward-Looking Statements
Certain matters discussed in this press release are “forward-looking statements” of Iovance Biotherapeutics, Inc. (hereinafter referred to as the “Company,” “we,” “us,” or “our”) within the meaning of the Private Securities Litigation Reform Act of 1995 (the “PSLRA”). Without limiting the foregoing, we may, in some cases, use terms such as “predicts,” “believes,” “potential,” “continue,” “estimates,” “anticipates,” “expects,” “plans,” “intends,” “forecast,” “guidance,” “outlook,” “may,” “can,” “could,” “might,” “will,” “should,” or other words that convey uncertainty of future events or outcomes and are intended to identify forward-looking statements. Forward-looking statements are based on assumptions and assessments made in light of management’s experience and perception of historical trends, current conditions, expected future developments, and other factors believed to be appropriate. Forward-looking statements in this press release are made as of the date of this press release, and we undertake no duty to update or revise any such statements, whether as a result of new information, future events or otherwise. Forward-looking statements are not guarantees of future performance and are subject to risks, uncertainties, and other factors, many of which are outside of our control, that may cause actual results, levels of activity, performance, achievements, and developments to be materially different from those expressed in or implied by these forward-looking statements. Important factors that could cause actual results, developments, and business decisions to differ materially from forward-looking statements are described in the sections titled "Risk Factors" in our filings with the U.S. Securities and Exchange Commission, including our most recent Annual Report on Form 10-K and Quarterly Reports on Form 10-Q, and include, but are not limited to, the following substantial known and unknown risks and uncertainties inherent in our business: the risks related to our ability to successfully commercialize our products, including Amtagvi, for which we have obtained U.S. Food and Drug Administration (“FDA”) approval, and Proleukin, for which we have obtained FDA and European Medicines Agency (“EMA”) approval; the risk that the EMA or other ex-U.S. regulatory authorities may not approve or may delay approval for our marketing authorization application submission for lifileucel in metastatic melanoma; the acceptance by the market of our products, including Amtagvi and Proleukin, and their potential pricing and/or reimbursement by payors, if approved (in the case of our product candidates), in the U.S. and other international markets and whether such acceptance is sufficient to support continued commercialization or development of our products, including Amtagvi and Proleukin, or product candidates, respectively; future competitive or other market factors may adversely affect the commercial potential for Amtagvi or Proleukin; the risk regarding our ability or inability to manufacture our therapies using third party manufacturers or at our own facility, including our ability to increase manufacturing capacity at such third party manufacturers and our own facility, may adversely affect our commercial launch; the results of clinical trials with collaborators using different manufacturing processes may not be reflected in our sponsored trials; the risk regarding the successful integration of the recent Proleukin acquisition; the risk that the successful development or commercialization of our products, including Amtagvi and Proleukin, may not generate sufficient revenue from product sales, and we may not become profitable in the near term, or at all; the risks related to the timing of and our ability to successfully develop, submit, obtain, or maintain FDA, EMA, or other regulatory authority approval of, or other action with respect to, our product candidates; whether clinical trial results from our pivotal studies and cohorts, and meetings with the FDA, EMA, or other regulatory authorities may support registrational studies and subsequent approvals by the FDA, EMA, or other regulatory authorities, including the risk that the planned single arm Phase 2 IOV-LUN-202 trial may not support registration; preliminary and interim clinical results, which may include efficacy and safety results, from ongoing clinical trials or cohorts may not be reflected in the final analyses of our ongoing clinical trials or subgroups within these trials or in other prior trials or cohorts; the risk that enrollment may need to be adjusted for our trials and cohorts within those trials based on FDA and other regulatory agency input; the risk that the changing landscape of care for cervical cancer patients may impact our clinical trials in this indication; the risk that we may be required to conduct additional clinical trials or modify ongoing or future clinical trials based on feedback from the FDA, EMA, or other regulatory authorities; the risk that our interpretation of the results of our clinical trials or communications with the FDA, EMA, or other regulatory authorities may differ from the interpretation of such results or communications by such regulatory authorities (including from our prior meetings with the FDA regarding our non-small cell lung cancer clinical trials); the risk that clinical data from ongoing clinical trials of Amtagvi will not continue or be repeated in ongoing or planned clinical trials or may not support regulatory approval or renewal of authorization; the risk that unanticipated expenses may decrease our estimated cash balances and forecasts and increase our estimated capital requirements; the risk that we may not be able to recognize revenue for our products; the risk that Proleukin revenues may not continue to serve as a leading indicator for Amtagvi revenues; the risks regarding our anticipated operating and financial performance, including our financial guidance and projections; the effects of global pandemic; the effects of global and domestic geopolitical factors; and other factors, including general economic conditions and regulatory developments, not within our control. Any financial guidance provided in this press release assumes the following: no material change in our ability to manufacture our products; no material change in payor coverage; no material change in revenue recognition policies; no new business development transactions not completed as of the period covered by this press release; and no material fluctuation in exchange rates.

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FAQ

What are the 5-year survival results for IOVA's Amtagvi in advanced melanoma?

Amtagvi demonstrated a 19.7% five-year survival rate in advanced melanoma patients, with a median overall survival of 13.9 months based on the Phase 2 C-144-01 trial results.

What is the response rate of Amtagvi (IOVA) in melanoma treatment?

Amtagvi achieved a 31.4% objective response rate, including 5.9% complete responses and 25.5% partial responses, with 31.3% of responders maintaining responses at the five-year mark.

When did FDA approve Iovance's Amtagvi for melanoma treatment?

The FDA granted accelerated approval to Amtagvi in February 2024 for treating adult patients with unresectable or metastatic melanoma previously treated with PD-1 blocking antibody and targeted therapy if applicable.

What makes Iovance's Amtagvi (IOVA) unique in cancer treatment?

Amtagvi is the first-ever one-time T cell therapy approved for solid tumor cancer, offering a novel treatment approach for advanced melanoma patients who have previously received other therapies.

How long do responses to Amtagvi (IOVA) typically last?

The median duration of response to Amtagvi is 36.5 months, with 31.3% of responding patients maintaining their responses through the five-year assessment period.