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“It Was Not a Cure”: Musunuru Cautions ASGCT on Baby KJ Promise

Published

1 month ago

May 13, 2026

BOSTON – When Kiran Musunuru, MD, PhD, walked to the microphone to deliver remarks on behalf of the team that won the American Society of Gene and Cell Therapy (ASGCT) 2026 Catalyst Award, most of the thousands of attendees surely expected a feel-good speech.

After all, it was 12 months ago that Musunuru, addressing the same convention in New Orleans, shared the exciting news regarding the delivery of a bespoke base editor to an infant, Baby KJ, with a rare urea cycle disorder. Musunuru and his colleague, Rebecca Ahrens-Niklas, MD, PhD, were recently named to the TIME 100 Most Influential People of 2026. “A decade from now,” stated Nobel laureate Jennifer Doudna, PhD, “their names will be in medical textbooks, not only for Baby KJ, but for opening the door to personalized genetic medicine for thousands of children after him.”

Musunuru and Ahrens-Niklas, from the University of Pennsylvania and Children’s Hospital of Philadelphia (CHOP), respectively, were honored alongside Doudna’s colleague Fyodor Urnov, PhD (Innovative Genomics Institute) and Danaher Corporation, for building the remarkable academia-industry consortium that designed and delivered the gene editing therapy, resulting in Baby KJ’s discharge from CHOP and a wave of national television appearances.

Indeed, Musunuru opened his ASGCT remarks in upbeat mood. “The potential is there to [deliver personalized therapies] over and over again for hundreds of diseases centered in the liver.” But halfway through his speech, Musunuru’s tone changed. While most grateful for the recognition from ASGCT, he said it was important to always “be your own worst critic.”

“I’ll be brutally honest,” Musunuru said. Despite the unquestionable “enthusiasm and excitement” surrounding the Baby KJ story, “there are some profound limitations. It was not really science at all!” Musunuru continued. “It was not a clinical trial. It was not clinical research. It was not a cure.”

“The best we can say is we hope we’ve turned a devastating disease into a milder, manageable condition. But it’s too early to say that… This was a personalized N-of-1 therapy—we can’t say what this means for anyone.”

Drawing applause from the audience, Musunuru pushed on: “We mustn’t be snake oil salesmen or give false hope… We have a profound ethical responsibility not to mislead families over what is possible.”

“We don’t actually know anything,” Musunuru said. “We need to do clinical trials—scientifically and ethically.”

The path forward

Musunuru set the Baby KJ story in the broader context of his group’s work on phenylketonuria (PKU), one of the classic inborn errors of metabolism. A few years ago, Musunuru and Ahrens-Niklas set about designing gene editing therapies targeting the first and sixth most common PKU mutations using adenine base editors. (There are more than 1,000 known mutations that cause PKU.)

After testing in humanized mouse models, the researchers were delighted to see the phenylalanine levels rapidly drop to normal, sustained for the lifetime of the mice. Flush with funding from the Somatic Cell Genome Editing program at NIH, Musunuru and Ahrens-Niklas began talks with the U.S. Food and Drug Administration in February 2024 to settle the question: Do we need separate Investigational New Drug applications (INDs) for each PKU variant?

“It is basically the same drug, the same gene, the same disease, the same clinical endpoints. Can’t we cover both variants in a single IND and a single ‘umbrella’ clinical trial?” summarized Musunuru. The answer was “maybe”—the agency needed to consider the full implications of the proposal.

The Philadelphia team began to develop workflows for four more PKU mutations, leading them to propose an umbrella trial for a revised total of six variants. Following another meeting with FDA officials in early 2025, the response was extremely positive: a single IND application would be appropriate, with a single toxicology study conducted in a single species. The FDA also agreed to consider additional variants.

In parallel, Ahrens-Niklas and Musunuru were studying sick patients with urea cycle disorders. Although these are liver disorders, “the real harm happens in the brain,” Musunuru said, resulting from toxic levels of ammonia. Enter Baby KJ’s diagnosis with CPS1 deficiency, and the notion that there was chance to design a personalized therapy.

In the Fall of 2024, Musunuru and Ahrens-Niklas held a pre-IND meeting with FDA officials. The idea was to streamline applications for a group of urea cycle disorders caused by mutations in seven different genes.

The FDA judged that all seven therapies could be evaluated in a single Phase I/II trial, but separate INDs would be required for each gene. “We’d have to do it piece by piece,” Musunuru said. First, file a master protocol for urea cycle disorders; after that IND clears, then file additional gene-specific INDs and amend the original IND.

“This is how we can make the trial accessible to all UCD patients across the country,” he said.

Back to the future

Coming back to the present, Musunuru stated that although the primary IND had been filed, “this does not mean the trial is open or we can enroll patients.” Musunuru listed three major issues:

The team has not yet manufactured any gene therapy product.
As seven INDs are needed to fully open the clinical trial, it will be well into 2027 until all INDs are submitted.
In February 2026, the FDA issued a draft Plausible Mechanism Framework. Musunuru’s team held another pre-IND meeting with the FDA to advocate for the use of prime editing for urea cycle disorders. After all, Musunuru reasoned, why should therapies be restricted to base editing approaches (G-to-A substitutions) but not patients who harbor a G-to-C mutation? The FDA indicated that a separate IND/BLA would be needed for each gene, and that process validation should be finalized before any dosing of Phase II subjects.

The path forward, Musunuru said, was to adopt an adaptive, real-time clinical trial design. That involves testing therapies, then advancing therapies from proof-of-concept to the validation phase. At that point, if all goes well, they can submit a BLA. Ahrens-Niklas and Musunuru laid out more details of their approach and dealings to date with the FDA in a commentary published late last year entitled: “How to create personalized gene editing platforms.”

With that, Musunuru hastily closed and exited stage left to give a keynote address at another conference across the road.

The post “It Was Not a Cure”: Musunuru Cautions ASGCT on Baby KJ Promise appeared first on GEN – Genetic Engineering and Biotechnology News.

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STAT+: Trump administration revisits policy to close Medicare drug price negotiation loophole

WASHINGTON — The Trump administration on Friday proposed to change a policy that is designed to prevent drugmakers from avoiding Medicare price negotiation by adding active ingredients to drugs.

The policy is part of an annual proposed rule that establishes the process that the Centers for Medicare and Medicaid Services uses to choose the next 20 drugs and biologics for price negotiation. Those drugs will be announced by Feb. 1, 2027, and their negotiated prices will take effect in 2029. The administration also considered a similar policy last year but put off a decision to study it further.

Medicare must wait seven to 11 years after a product is approved by the Food and Drug Administration before it can negotiate its price, depending on the type of medicine. Biologics that are typically administered in doctor offices get more time than drugs taken orally.

Continue to STAT+ to read the full story…

Published

36 minutes ago

June 12, 2026

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WASHINGTON — The Trump administration on Friday proposed to change a policy that is designed to prevent drugmakers from avoiding Medicare price negotiation by adding active ingredients to drugs.

Continue to STAT+ to read the full story…

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Hantavirus One-Shot mRNA Vaccine Fully Protects in Syrian Hamster Model

Published

4 hours ago

June 12, 2026

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Last month, the Andes virus outbreak on a Dutch cruise ship departing from Argentina brought a transmission context for hantavirus, that was previously unprecedented, to the forefront. The Andes virus is the only member of the hantavirus family that is capable of efficient person-to-person spread through close contact with respiratory secretions. Other hantaviruses are typically spread through contact with infected rodents, making the Andes virus a much more significant public health threat.

While at sea, the outbreak spread among passengers and crew, infecting 13 people and killing three. The cruise passengers have since returned to their home countries, 23 in total. Because a person can carry the virus for weeks before showing any symptoms, health agencies are facing a complex challenge of identifying everyone who was exposed. There are currently no vaccines or preventive treatments approved for the virus; this travel-related outbreak brought the need for vaccine development to the forefront.

Researchers at The University of Texas Medical Branch (UTMB) had previously developed and tested two mRNA vaccines against intramuscular Andes virus challenge in golden Syrian hamsters (“1-methylpseudouridine-modified or non-modified mRNA modalities encoding the envelope glycoproteins, Gn and Gc, in a single open reading frame.”)

When tested in the Syrian hamster model, both mRNA vaccines were efficacious in hamsters using a two-dose regimen. Recognizing that a fast-moving international outbreak doesn’t allow time for patients to wait weeks between shots, the team retested the vaccines to determine whether a single dose would be effective.

Now, a new report shares the finding that the vaccine provided full protection against the Andes hantavirus after a single dose.

This work is published in The Lancet in the paper, “Single-dose mRNA vaccines against Andes hantavirus.”

Alexander Bukreyev, PhD, head of the Laboratory of Viral Pathogenesis and Vaccine Development at UTMB, said that the group is working to fast-track these single-dose vaccines into human clinical trials.

The results exceeded expectations. When testing the vaccines in an animal model that mimics human disease, the scientists found that a single shot provided 100% protection against a lethal dose of the virus. Even when the researchers significantly lowered the dosage to a fraction of the original amount, the results remained definitive.

“Every vaccinated animal remained completely healthy and showed no symptoms or weight loss,” said Michelle Meyer, PhD, senior scientist in the Bukreyev Laboratory. “When we looked at the tissues from the vaccinated animals a month after infection, the virus was entirely gone. The vaccines triggered a powerful immune response, creating protective antibodies in as little as 14 days.”

Because the Andes virus can take a relatively long time to make a human severely ill, these fast-acting vaccines could serve a dual purpose, possibly functioning as an emergency tool for people who have already been exposed.

“If given quickly to high-risk contacts during an outbreak, such as the Andes virus situation on the cruise ship, the vaccines could theoretically jump-start their immune systems fast enough to intercept the virus—stopping it from replicating and preventing them from getting sick or spreading it further,” Bukreyev said.

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SonoThera Raises $125M to Develop Ultrasound-Mediated Genetic Medicines

Published

4 hours ago

June 12, 2026

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Biotechnology company SonoThera has raised $125 million in an oversubscribed Series B financing round. The financing was led by Vida Ventures, with participation from ARK Invest, CureDuchenne Ventures, Leaps by Bayer, Otsuka Pharmaceutical, SymBiosis, UCB Ventures SA, Vivo Capital, and existing investors ARCH Venture Partners, Alexandria Venture Investments, Duquesne Family Office, Illumina Ventures, Johnson & Johnson Innovation – JJDC, Medical Excellence Capital, RA Capital, and Vertex Ventures HC.

SonoThera will use the funds to advance its lead programs in Duchenne muscular dystrophy (DMD) and autosomal dominant polycystic kidney disease (ADPKD) in the clinic. The funds will also support efforts to expand its pipeline of targeted redosable genetic medicines across multiple organ systems and scale its proprietary platform technologies for safe, targeted therapy delivery.

The company’s platform combines a proprietary ultrasound-mediated delivery technology dubbed RIPPLE, with a payload engineering platform dubbed PORE. The platforms are designed to support the development of DNA and RNA therapeutics, gene editing, and gene silencing approaches. SonoThera is using its tech to develop genetic medicines that it claims will address key limitations of conventional gene therapies including delivery challenges, payload size constraints, immune responses, safety events, and difficulties with redosing.

As Kenneth Greenberd, PhD, SonoThera’s co-founder and CEO, stated “we founded SonoThera to take a fundamentally different approach, with a platform designed to broaden the therapeutic possibilities of the field. We believe our technology has the potential to expand the range of diseases addressable by genetic medicines while enabling more precise, durable, safer, and repeatable therapies for patients.”

SonoThera has already demonstrated the targeted delivery and expression capabilities of its platform across multiple tissues, including skeletal muscle, heart, liver, kidney, adipose, and brain. It has also shown that it can deliver large payloads such as full-length dystrophin for DMD and RNA-based payloads for gene silencing applications in preclinical studies.

The company expects to initiate its first clinical trial in DMD in 2027.

Commenting on the financing, Rajul Jain, MD, managing director at Vida Ventures, said “we believe SonoThera, with its RIPPLE delivery and PORE payload engineering technologies, has the potential to unlock opportunities in diseases with significant unmet need that have been previously inaccessible to other genetic medicine approaches.”

In connection with the financing, Jain and Rakhshita Dhar, MS, vice president & head of Healthcare Venture Investments at Leaps by Bayer, have joined SonoThera’s Board of Directors.

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