Beam Therapeutics Announces Clearance of Investigational New Drug Application for BEAM-302 for the Treatment of Alpha-1 Antitrypsin Deficiency (AATD) by the United States (U.S.) Food and Drug Administration

March 27, 2025 16:01 ET | Source: Beam Therapeutics U.S. IND Represents Regulatory Clearance For BEAM-302 Spanning Six Countries and Second Open IND for a Beam In Vivo Base Editing Program in the U.S. CAMBRIDGE, Mass., March 27, 2025 (GLOBE NEWSWIRE) -- Beam Therapeutics Inc. (Nasdaq: BEAM), a biotechnology company developing precision genetic medicines through base editing, today announced that the United States (U.S.) Food and Drug Administration (FDA) has cleared the investigational new drug (IND) application for BEAM-302 for the treatment of alpha-1 antitrypsin deficiency (AATD). AATD is an inherited genetic disorder that affects the lungs and/or liver, leading to early onset emphysema and liver disease, and for which there are no currently approved curative treatments. “The FDA’s clearance of our IND for BEAM-302 is a significant step toward advancing the development of this potential breakthrough treatment for patients living with AATD in the U.S.,” said Giuseppe Ciaramella, Ph.D., president of Beam. “Earlier this month, we shared groundbreaking initial safety and efficacy data from our global Phase 1/2 study of BEAM-302, showcasing the first ever clinical genetic correction of a disease-causing mutation. As we move forward, we’re laser focused on progressing this trial to enroll and dose more patients, activating more sites in new geographies, and preparing to present updated data in the second half of the year.” BEAM-302 is a liver-targeting lipid-nanoparticle (LNP) formulation of a guide RNA and an mRNA encoding a base editor designed to correct the disease-causing PiZ mutation in patients with AATD. BEAM-302 is being evaluated in an ongoing Phase 1/2, open-label, dose exploration and dose expansion clinical trial to investigate its safety, tolerability, pharmacodynamics, pharmacokinetics and efficacy. Part A of the trial is designed to evaluate AATD patients with lung disease, and Part B will evaluate AATD patients with mild to moderate liver disease with or without lung disease. Initial safety and efficacy results from the trial were reported in March 2025 and established proof of concept for BEAM-302 as a potential one-time treatment for AATD. In addition to the U.S., BEAM-302 has received clinical trial authorization from the United Kingdom, New Zealand, Australia, the Netherlands and Ireland. Beam plans to continue the dose-escalation portion of Part A, including enrolling and dosing a fourth dose cohort, and expects to report further data at a medical conference in the second half of 2025. In addition, the company plans to dose the first patient in Part B, which will include AATD patients with mild to moderate liver disease, in the second half of 2025. About BEAM-302BEAM-302 is a liver-targeting lipid-nanoparticle (LNP) formulation of base editing reagents designed to convert the mutant PiZ to corrected PiM isoform. Patients homozygous for this mutation (PiZZ) represent the majority of patients living with severe AATD disease. A one-time A-to-G correction of the PiZ mutation with Beam’s adenine base editor has the potential to simultaneously reduce the aggregation of mutant, misfolded AAT protein that causes toxicity to the liver (Z-AAT), generate therapeutic levels of corrected protein (M-AAT), and increase total and functional AAT in circulation, thereby addressing the underlying pathophysiology of both the liver and lung disease. In addition, the reduction in circulating PiZ aggregates (i.e., polymers) has the potential to further minimize lung inflammation and dysfunction. Importantly, because the native AAT gene would be corrected in its normal genetic location, AAT levels are anticipated to increase physiologically in response to inflammation or infection. This is a critical aspect of AAT’s normal function to regulate the body’s inflammatory response, which does not occur with currently approved protein replacement therapies. Correction of the PiZ mutation is expected to be durable based on preclinical and clinical evidence. About Alpha-1 Antitrypsin Deficiency (AATD)AATD is an inherited genetic disorder that can cause early onset emphysema and liver disease. The most severe form of AATD arises when a patient has a point mutation in both copies of the SERPINA1 gene at amino acid 342 position (E342K, also known as the PiZ mutation or the “Z” allele). This point mutation causes alpha-1 antitrypsin, or AAT, to misfold, accumulating inside liver cells rather than being secreted, resulting in very low levels (10%-15%) of circulating AAT. In addition to resulting in lower levels, the PiZ AAT protein variant is also less enzymatically effective compared to wildtype AAT protein. As a consequence, the lung is left unprotected from neutrophil elastase, resulting in progressive, destructive changes in the lung, such as emphysema, which can result in the need for lung transplants. The mutant AAT protein also accumulates in the liver, causing liver inflammation and cirrhosis, which can ultimately cause liver failure, requiring patients to undergo a liver transplant, or cancer. It is estimated that approximately 100,000 individuals in the U.S. have two copies of the Z allele, known as the PiZZ genotype, although only about 10% of all patients are thought to have been diagnosed. There are currently no curative treatments approved for patients with AATD, and the only approved therapy in the U.S., intravenous AAT protein replacement, has not been shown to prevent ongoing lung function decline and destruction in patients. About Beam TherapeuticsBeam Therapeutics (Nasdaq: BEAM) is a biotechnology company committed to establishing the leading, fully integrated platform for precision genetic medicines. To achieve this vision, Beam has assembled a platform with integrated gene editing, delivery and internal manufacturing capabilities. Beam’s suite of gene editing technologies is anchored by base editing, a proprietary technology that is designed to enable precise, predictable and efficient single base changes, at targeted genomic sequences, without making double-stranded breaks in the DNA. This has the potential to enable a wide range of therapeutic editing strategies that Beam is using to advance a diversified portfolio of base editing programs. Beam is a values-driven organization committed to its people, cutting-edge science, and a vision of providing life-long cures to patients suffering from serious diseases. Cautionary Note Regarding Forward-Looking StatementsThis press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Investors are cautioned not to place undue reliance on these forward-looking statements, including, but not limited to, statements related to: the therapeutic applications and potential of our technology, including our potential to develop life-long, curative, precision genetic medicines for patients through base editing; our plans, and anticipated timing, to advance our BEAM-302 program; and the clinical trial designs and expectations for BEAM-302. Each forward-looking statement is subject to important risks and uncertainties that could cause actual results to differ materially from those expressed or implied in such statement, including, without limitation, risks and uncertainties related to: our ability to develop, obtain regulatory approval for, and commercialize our product candidates, which may take longer or cost more than planned; our ability to raise additional funding, which may not be available; our ability to obtain, maintain and enforce patent and other intellectual property protection for our product candidates; the uncertainty that our product candidates will receive regulatory approval necessary to advance human clinical trials; that preclinical testing of our product candidates and preliminary or interim data from preclinical studies and clinical trials may not be predictive of the results or success of ongoing or later clinical trials; that initiation and enrollment of, and anticipated timing to advance, our clinical trials may take longer than expected; that our product candidates or the delivery modalities we rely on to administer them may cause serious adverse events; that our product candidates may experience manufacturing or supply interruptions or failures; risks related to competitive products; and the other risks and uncertainties identified under the headings “Risk Factors Summary” and “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2024, and in any subsequent filings with the Securities and Exchange Commission. These forward-looking statements speak only as of the date of this press release. Factors or events that could cause our actual results to differ may emerge from time to time, and it is not possible for us to predict all of them. We undertake no obligation to update any forward-looking statement, whether as a result of new information, future developments or otherwise, except as may be required by applicable law. Contacts: Investors:Holly ManningBeam Therapeuticshmanning@beamtx.com Media:Josie Butler1ABjosie@1abmedia.com

Beam Therapeutics Announces Clearance of Investigational New Drug Application for BEAM-302 for the Treatment of Alpha-1 Antitrypsin Deficiency (AATD) by the United States (U.S.) Food and Drug Administration

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