BioMarin Presents New Data on the Positive Impact of Early Treatment With VOXZOGO® (vosoritide) on Proportionality and Arm Span in Children with Achondroplasia at the 2026 American College of Medical Genetics and Genomics (ACMG) Annual Clinical Genetics Meeting

Rhea-AI Summary

BioMarin (Nasdaq: BMRN) reported new data showing early treatment with VOXZOGO (vosoritide) improves proportionality, arm span and BMI in children with achondroplasia, with durable multi-year gains. Key findings include a 4.7 cm additional height gain after four years and ULBR improvement to −0.53 by year four. Real-world data cover >5,000 infants and children across 50+ countries and align with clinical-trial results supporting earlier treatment.

Positive

• Additional height +4.7 cm after four years in children starting treatment at 0.5–<2 years
• Height Z-score +0.8 versus untreated peers after four years
• ULBR improvement −0.53 versus untreated children by year four
• Real-world gains: +9.91 cm at 12 months and +15.62 cm at 24 months in Japan
• Clinical exposure: >10,000 patient-years of data and >5,000 treated children globally

Negative

• None.

News Market Reaction – BMRN

-2.07%

-2.07% Session close to close

In the Mar 12 session, BMRN declined 2.07%, reflecting a moderate negative market reaction.

Data tracked by StockTitan Argus on the day of publication.

Market Context

This announcement adds substantial clinical depth to VOXZOGO’s profile, highlighting multi‑year impr...

Analysis

This announcement adds substantial clinical depth to VOXZOGO’s profile, highlighting multi‑year improvements in proportionality, arm span, body mass index, and height, supported by over 10,000 patient-years and real‑world data from Europe, Japan, and the U.S. In the context of recent revenue growth led by VOXZOGO, investors may track how these outcomes beyond height influence adoption, payer decisions, and future label or guideline discussions while monitoring BioMarin’s broader pipeline and integration of planned acquisitions.

Key Figures

Total patient exposure: over 10,000 patient-years ULBR difference year 1 (<2y start): -0.33 (p=0.0005) ULBR difference year 4 (<2y start): -0.53 (p<0.0001) +5 more

8 metrics

Total patient exposure over 10,000 patient-years Cumulative VOXZOGO clinical and real-world experience

ULBR difference year 1 (<2y start) -0.33 (p=0.0005) Least squares mean ULBR difference vs untreated at year one

ULBR difference year 4 (<2y start) -0.53 (p<0.0001) Least squares mean ULBR difference vs untreated at year four

Additional height gain 4.7 cm (p=0.0002) After 4 years in children starting VOXZOGO between 0.5 and <2 years

Height Z-score change 0.8 (p=0.0008) Height Z-score improvement vs untreated after 4 years

Japan 12-month height change 9.91 cm Mean height change from baseline at 12 months in Japan cohort

Japan 24-month height change 15.62 cm Mean height change from baseline at 24 months in Japan cohort

France 36-month height gain 16.7 cm; Z-score +0.75 Mean height gain and Z-score increase after 36 months in France study

Historical Context

5 past events · Latest: Feb 27 (Positive)

Pattern 5 events

Date	Event	Sentiment	24h Move	Catalyst
Feb 27	FDA approval	Positive	-3.2%	FDA approved PALYNZIQ for adolescents with PKU based on Phase 3 PEGASUS data.
Feb 24	Investor conferences	Neutral	-0.5%	Management scheduled participation in four March investor conferences and webcasts.
Feb 23	Earnings and M&A	Neutral	-0.5%	Reported 2025 revenue growth, VOXZOGO expansion, Amicus deal, and ROCTAVIAN withdrawal charges.
Feb 18	Market outlook	Positive	+2.6%	External report projected PKU market growth including BioMarin among key beneficiaries.
Feb 17	Earnings call notice	Neutral	+0.1%	Announced timing and access details for the Q4 and full‑year 2025 results call.

24h Move is the share-price change in the day after each event; other market factors may also have contributed.

Pattern Detected

Recent news often showed weak or negative price reactions even to seemingly positive fundamentals or approvals, suggesting a pattern of cautious sentiment around BMRN updates.

Recent Company History

Over the last month, BioMarin reported strong 2025 revenue growth and guidance, an Amicus acquisition, and an FDA approval for PALYNZIQ, yet share reactions were modestly negative or flat. A PKU market report was one of the few items with a clearly positive move. Against that backdrop, the new VOXZOGO achondroplasia data adds to an already growth‑focused narrative around skeletal disorders and rare diseases, but pre‑news trading again reflected investor caution.

Key Terms

upper‑to‑lower body segment ratio (ULBR), body mass index (BMI), height Z‑score, post-authorization safety study, +2 more

6 terms

upper‑to‑lower body segment ratio (ULBR) medical

"For proportionality, measured by change from baseline in upper‑to‑lower body segment ratio (ULBR)..."

The upper-to-lower body segment ratio (ULBR) compares the length of a person’s torso and arms to the length of their legs, like measuring whether someone’s “top half” is longer or shorter than their “bottom half.” Investors should care because this simple body-measure influences design, sizing, and performance in medical devices, wearable tech, ergonomic products and clinical trials: mismatches can affect usability, trial eligibility, regulatory approval and market acceptance, which in turn impacts commercial success.

body mass index (BMI) medical

"Researchers also saw significant improvements in body mass index (BMI) in children..."

Body mass index (BMI) is a simple number calculated from a person’s weight and height that gives a rough indication of whether their body size falls into categories such as underweight, normal, overweight, or obese. For investors, BMI matters because it’s a common screening measure used in public health, insurance underwriting, clinical trials and market research; shifts in population BMI can affect demand for medical services, drugs, insurance costs and related business risks, like a quick fuel-gauge that signals broader health trends.

height Z‑score medical

"an average height Z‑score improvement of 0.8 (p=0.0008) was observed..."

Height z-score measures how a person’s height compares to the average height for their age and sex, expressed in units of standard deviation so you know how far above or below the norm they are. Investors watch height z-scores in medical and clinical contexts because they quantify treatment effects on growth (like a kid moving from below average toward average), helping assess a therapy’s effectiveness and potential market value.

post-authorization safety study medical

"the Acorn Study, a multicenter, post-authorization safety study enrolling participants throughout Europe..."

A post-authorization safety study is research carried out after a drug or medical product has received regulatory approval to track how it performs and whether any rare or long-term side effects appear when used by large numbers of patients. For investors, these studies matter because their results can prompt label changes, usage limits, additional testing, recalls, or legal exposure—outcomes that can materially affect sales, market access and a company’s valuation; think of it as ongoing safety checks for a product after it leaves the factory.

quantitative computed tomography medical

"Results From Quantitative Computed Tomography AnalysesPoster #P271..."

Quantitative computed tomography (QCT) is a medical imaging technique that uses CT scans to measure the amount and density of tissues, most often bone or lung, in numeric form rather than just pictures. Think of it as taking a series of slice photographs and converting them into precise measurements that track change over time. Investors care because QCT provides objective endpoints for clinical trials, helps assess marketable diagnostic value, and can influence regulatory approval, reimbursement decisions, and the commercial potential of therapies or devices.

health-related quality of life medical

"Real-World Healthcare Utilization, Effectiveness, Health-Related Quality of Life, and Adherence..."

A measure of how a person’s health status affects their ability to live, work and enjoy life, covering physical comfort, mental well‑being and social participation, usually captured by patient questionnaires and numeric scores. Investors care because improvements in these scores can drive regulatory approval, insurance coverage, patient demand and pricing, much like customer satisfaction ratings predict whether a product will sell and generate revenue.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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New results demonstrate early VOXZOGO treatment leads to durable and sustained improvements in skeletal growth-related health outcomes, including proportionality, arm span and body mass index, building on over 10,000 patient-years of data  

VOXZOGO is the only approved treatment for children with achondroplasia starting at birth and has the most extensive published clinical evidence, including in measures beyond growth, among all achondroplasia treatments

SAN RAFAEL, Calif., March 12, 2026 /PRNewswire/ -- BioMarin Pharmaceutical Inc. (Nasdaq: BMRN) today announced positive new data from studies of VOXZOGO^® (vosoritide) in children with achondroplasia in ongoing clinical trials and real-world studies. The latest findings reinforce the importance of early treatment and the well-known, established efficacy and safety of VOXZOGO. The data will be presented at the 2026 American College of Medical Genetics and Genomics (ACMG) Annual Clinical Genetics Meeting in Baltimore.

Early Treatment, Maximum Impact in Children Who Start Treatment Before Age 2

New data will be presented from a study of children who started VOXZOGO before age 2, which showed that treatment was associated with durable, multi-year growth improvements, including body proportionality and arm span compared to untreated children, as well as improvements in height over time.

For proportionality, measured by change from baseline in upper‑to‑lower body segment ratio (ULBR), the least squares mean difference versus untreated children showed improvement by year one in children initiating VOXZOGO under age 2, and this difference continued to improve each year through year four. Specifically, the least squares mean difference versus untreated children in year one was −0.33 (p=0.0005) in children initiating VOXZOGO under age 2, and −0.10 (p=0.042) in those initiating treatment with VOXZOGO under 6 months; by year four, this trend continued, with a least squares mean difference of −0.53 (p<0.0001) in children initiating VOXZOGO under age 2 compared to untreated children, and −0.23 (p=0.0003) in those who initiated treatment with VOXZOGO under 6 months.

Additional analyses further emphasize that these children showed durable improvements in height while maintaining stable arm‑to‑height ratios, consistent with arm span improvements compared to untreated children, which is particularly relevant in early life. Researchers also saw significant improvements in body mass index (BMI) in children who initiated treatment when compared to untreated children.

"It is encouraging to see increasing data on outcomes beyond height, including measures such as body proportionality and arm span," said Michael Hughes, Chair of the Biotech Industry Liaison Committee at Little People of America (LPA). "BioMarin's continued efforts on studying these outcomes, along with findings suggesting improvements in these areas with treatments such as VOXZOGO, help expand our understanding of skeletal development in achondroplasia and inform conversations between families and their healthcare providers."

With regard to growth measures, among more than 20 children who began treatment between 0.5 to <2 years of age, average additional height gain after four years of treatment was 4.7 cm (p=0.0002), and an average height Z‑score improvement of 0.8 (p=0.0008) was observed compared to untreated children in the same reference population, supporting sustained improvement in height relative to expected growth rates in children with achondroplasia.

"Today's results reaffirm what treating physicians have consistently told us and what was published in consensus clinical guidelines: the earlier you treat with VOXZOGO, the greater the likelihood of maximizing the benefit seen with this treatment, not just in height but more importantly, other measures of health including proportionality," said Greg Friberg, M.D., Executive Vice President and Chief Research & Development Officer at BioMarin. "As the only approved medicine for children with achondroplasia starting at birth, VOXZOGO provides physicians a medicine that we know is effective and has a positive safety profile in the youngest children with achondroplasia, where there is the greatest opportunity to make an impact on the overall health of these children."

Global Real-World Evidence from Europe, Japan and the U.S.

To date, more than 5,000 infants and children across more than 50 countries have received VOXZOGO. At ACMG, researchers will present findings on real-world evidence highlighting the impact of VOXZOGO in children who were treated in Japan, Europe and the U.S.

Children with achondroplasia in Japan under the age of 2 years who received VOXZOGO demonstrated good adherence to treatment and robust height improvements, including a mean change from baseline at 12 months of 9.91 cm, and a mean height change from baseline at 24 months of 15.62 cm. In a real-world study out of France, children who received VOXZOGO for 36 months demonstrated sustained growth benefits, including a mean height gain of 16.7 cm with a 0.75 increase in height Z-score compared to the average population.

These findings were supported by interim results from the Acorn Study, a multicenter, post-authorization safety study enrolling participants throughout Europe with an observation period of 10 years from enrollment of the first participant. In addition, the real-world benefit of VOXZOGO was also demonstrated in the VIrtual STudy in Achondroplasia (VISTA) in the U.S., where effectiveness data were consistent with clinical trial data, and trends in improvements in physical functioning underscored the importance of early treatment initiation to maximize clinical benefit.

Below are BioMarin's key poster presentations at ACMG, with all times listed in Eastern Daylight Time:

Skeletal Conditions

Experimental FGFR3 Saturation Mutagenesis and Big-Data Integration Identify 20 Novel Pathogenic Variants in Hypochondroplasia
Poster #P107
Thursday, March 12, 10:30 – 11:30 a.m.

Long-Term Vosoritide Improves Bone Mineral Density and Bone Content in Children With Achondroplasia: Results From Quantitative Computed Tomography Analyses
Poster #P271
Thursday, March 12, 10:30 – 11:30 a.m.

Real-World Healthcare Utilization, Effectiveness, Health-Related Quality of Life, and Adherence to Vosoritide in Children with Achondroplasia in the United States
Poster #P209
Thursday, March 12, 10:30 – 11:30 a.m.

Early Start, Maximum Impact: Long-Term Trial Data Supporting Cumulative Clinical Benefit in Children Who Initiated Vosoritide <2 Years Old
Poster #P174
Friday, March 13, 10:30 – 11:30 a.m.

Effectiveness of Vosoritide in Children With Achondroplasia Starting Treatment Aged <2 Years: Interim Results From a Japanese Real-World Study
Poster #P216
Friday, March 13, 10:30 – 11:30 a.m.

From Early Access to Routine Care: Prospective Real-World Follow-Up of Vosoritide in Achondroplasia in France
Poster #P222
Friday, March 13, 10:30 – 11:30 a.m.

Interim Real-World Results From the Acorn Study: Long-Term Safety and Growth Outcomes of Vosoritide in Children With Achondroplasia
Poster #P138
Friday, March 13, 10:30 – 11:30 a.m.

Enzyme Therapies

Updating the Spectrum of ARSB Mutations Suspected of Causing Maroteaux-Lamy (MPS VI) to Enable Genetic Prevalence Estimation and Improve Diagnostics
Poster #P319
Thursday, March 12, 10:30 – 11:30 a.m.

Updating the Spectrum of GALNS Mutations Suspected of Causing Morquio A (MPS IVA) to Enable Genetic Prevalence Estimation and Improve Diagnosis
Poster #P245
Thursday, March 12, 10:30 – 11:30 a.m.

Updating the Spectrum of TPP1 Mutations Suspected of Causing CLN2 (Batten Disease) to Enable Earlier Genetic Testing and Inform Prevalence
Poster #P219
Thursday, March 12, 10:30 – 11:30 a.m.

About Achondroplasia

Achondroplasia, the most common form of skeletal dysplasia leading to disproportionate short stature in humans, is characterized by slowing of endochondral ossification, which results in disproportionate short stature and disordered architecture in the long bones, spine, face and base of the skull. This condition is caused by a change in the FGFR3 gene, a negative regulator of bone growth.

More than 80% of children with achondroplasia have parents of average stature and have the condition as the result of a spontaneous gene mutation. The worldwide incidence rate of achondroplasia is about one in 25,000 live births. VOXZOGO is being tested in children whose growth plates are still "open," typically those under 18 years of age. Approximately 25% of people with achondroplasia fall into this category.

For more information about our clinical trials in achondroplasia, hypochondroplasia and other skeletal conditions, please visit clinicaltrials.biomarin.com.

About VOXZOGO

In children with achondroplasia, endochondral bone growth, an essential process by which bone tissue is created, is negatively regulated due to a gain of function mutation in FGFR3. VOXZOGO, a C-type natriuretic peptide (CNP) analog, acts as a positive regulator of the signaling pathway downstream of FGFR3 to promote endochondral bone growth.

VOXZOGO is the only approved medicine to support the growth of children with achondroplasia starting from birth, with international consensus guidelines recommending initiation of VOXZOGO as early as possible. First approved in 2021, VOXZOGO has helped more than 5,000 infants and children in more than 50 countries. Through our ongoing studies, BioMarin continues to evaluate VOXZOGO on key clinical endpoints relevant for achondroplasia patients, such as arm span, tibial bowing (leg bowing), body proportionality, spinal morphology (including spinal stenosis) and quality of life measures.

VOXZOGO is approved in the U.S., Japan and Australia to increase linear growth in children of all ages with achondroplasia with open epiphyses, and VOXZOGO is indicated in the EU for the treatment of achondroplasia in children 4 months of age and older whose epiphyses are not closed, as confirmed by appropriate genetic testing. In the U.S., this indication is approved under accelerated approval based on an improvement in annualized growth velocity. Continued approval may be contingent upon verification and description of clinical benefit in confirmatory trial(s). To fulfill this post-marketing requirement, BioMarin intends to use the ongoing open-label extension studies compared to available natural history.

Patient Support Accessing VOXZOGO

BioMarin's robust support services have ensured a seamless treatment experience, spearheaded by Clinical Coordinators, who have conducted hundreds of trainings for families with achondroplasia since approval. BioMarin provides resources to support families navigating achondroplasia, including a caregiver mentorship program that connects parents with other caregivers, and a U.S. doctor directory that helps families and healthcare professionals identify clinicians experienced in achondroplasia care.

To reach a BioMarin RareConnections^® Case Manager, please call, toll-free, 1-833-VOXZOGO (1-833-869-9646) or e-mail VOXZOGOSupport@biomarin-rareconnections.com. For more information about VOXZOGO, please visit www.voxzogo.com. For additional information regarding this product, please contact BioMarin Medical Information at medinfo@bmrn.com.

VOXZOGO U.S. Important Safety Information

What is VOXZOGO used for?

• VOXZOGO is a prescription medicine used to increase linear growth in children with achondroplasia and open growth plates (epiphyses).
• VOXZOGO is approved under accelerated approval based on an improvement in annualized growth velocity. Continued approval may be contingent upon verification and description of clinical benefit in confirmatory trials.

What is the most important safety information about VOXZOGO?

• VOXZOGO may cause serious side effects including a temporary decrease in blood pressure in some patients. To reduce the risk of a decrease in blood pressure and associated symptoms (dizziness, feeling tired, or nausea), patients should eat a meal and drink 8 to 10 ounces of fluid within 1 hour before receiving VOXZOGO.

What are the most common side effects of VOXZOGO?

• The most common side effects of VOXZOGO include injection site reactions (including redness, itching, swelling, bruising, rash, hives, and injection site pain), high levels of blood alkaline phosphatase shown in blood tests, vomiting, joint pain, decreased blood pressure, and stomachache. These are not all the possible side effects of VOXZOGO. Ask your healthcare provider for medical advice about side effects, and about any side effects that bother the patient or that do not go away.

How is VOXZOGO taken?

• VOXZOGO is taken daily as an injection given under the skin, administered by a caregiver after a healthcare provider determines the caregiver is able to administer VOXZOGO. Do not try to inject VOXZOGO until you have been shown the right way by your healthcare provider. VOXZOGO is supplied with Instructions for Use that describe the steps for preparing, injecting, and disposing VOXZOGO. Caregivers should review the Instructions for Use for guidance and any time they receive a refill of VOXZOGO in case any changes have been made.
• Inject VOXZOGO 1 time every day, at about the same time each day. If a dose of VOXZOGO is missed, it can be given within 12 hours from the missed dose. After 12 hours, skip the missed dose and administer the next daily dose as usual.
• The dose of VOXZOGO is based on body weight. Your healthcare provider will adjust the dose based on changes in weight following regular check-ups.
• Your healthcare provider will monitor the patient's growth and tell you when to stop taking VOXZOGO if they determine the patient is no longer able to grow. Stop administering VOXZOGO if instructed by your healthcare provider.

What should you tell the doctor before or during taking VOXZOGO?

• Tell your doctor about all of the patient's medical conditions including
  • If the patient has heart disease (cardiac or vascular disease), or if the patient is on blood pressure medicine (anti-hypertensive medicine).
  • If the patient has kidney problems or renal impairment.
  • If the patient is pregnant or plans to become pregnant. It is not known if VOXZOGO will harm the unborn baby.
  • If the patient is breastfeeding or plans to breastfeed. It is not known if VOXZOGO passes into breast milk.
• Tell your doctor about all of the medicines the patient takes, including prescription and over-the-counter medicines, vitamins, and herbal supplements.

You may report side effects to BioMarin at 1-866-906-6100. You are encouraged to report negative side effects of prescription drugs to the FDA. Visit www.fda.gov/medwatch, or call 1-800-FDA-1088.

Please see additional safety information in the full Prescribing Information and Patient Information.

About BioMarin

BioMarin is a leading, global rare disease biotechnology company focused on delivering medicines for people living with genetically defined conditions. Founded in 1997, the San Rafael, California-based company has a proven track record of innovation, with eight commercial therapies and a strong clinical and preclinical pipeline. Using a distinctive approach to drug discovery and development, BioMarin seeks to unleash the full potential of genetic science by pursuing category-defining medicines that have a profound impact on patients. To learn more, please visit www.biomarin.com.  

Forward-Looking Statements

This press release contains forward-looking statements about the business prospects of BioMarin Pharmaceutical Inc. (BioMarin), including without limitation, statements about: the data to be presented at the 2026 American College of Medical Genetics and Genomics Annual Clinical Genetics Meeting, including the key poster presentations; the development of BioMarin's VOXZOGO program; the safety profile and potential benefits of VOXZOGO for children with achondroplasia, including the expectation that earlier treatment should lead to potentially greater benefits; and the continued clinical development of VOXZOGO. These forward-looking statements are predictions and involve risks and uncertainties such that actual results may differ materially from these statements. These risks and uncertainties include, among others, any potential adverse events observed in the continuing monitoring of the patients in the clinical trials; the content and timing of decisions by the U.S. Food and Drug Administration, the European Medicines Agency, the European Commission and other regulatory authorities; and those factors detailed in BioMarin's filings with the Securities and Exchange Commission (SEC), including, without limitation, the factors contained under the caption "Risk Factors" in BioMarin's Annual Report on Form 10-K for the year ended December 31, 2025, as such factors may be updated by any subsequent filings with the SEC. Investors are urged not to place undue reliance on forward-looking statements, which speak only as of the date hereof. BioMarin is under no obligation, and expressly disclaims any obligation to update or alter any forward-looking statement, whether as a result of new information, future events or otherwise.

BioMarin^®, BioMarin RareConnections^® and VOXZOGO^® are registered trademarks of BioMarin Pharmaceutical Inc.

Contacts:
Investors	Media
Traci McCarty	Andrew Villani
BioMarin Pharmaceutical Inc.	BioMarin Pharmaceutical Inc.
(415) 455-7558	(628) 269-7393

 

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SOURCE BioMarin Pharmaceutical Inc.

FAQ

What did BioMarin announce about VOXZOGO effectiveness for children under 2 (BMRN) on March 12, 2026?

Early treatment with VOXZOGO showed durable multi-year improvements in proportionality and height in children starting before age 2. According to the company, treated children had a mean additional height gain of 4.7 cm after four years versus untreated peers, with sustained ULBR improvement.

How much did VOXZOGO change upper-to-lower body ratio (ULBR) by year four in BMRN data?

Treated children showed a ULBR least squares mean difference of −0.53 versus untreated children by year four. According to the company, this represents progressive improvement in body proportionality among children who began treatment before age 2.

What real-world height gains were reported for VOXZOGO in Japan and Europe (BMRN)?

Real-world studies showed mean height changes of 9.91 cm at 12 months and 15.62 cm at 24 months in Japan, and 16.7 cm after 36 months in France. According to the company, these findings align with clinical-trial effectiveness and adherence data.

Does BioMarin report safety and exposure data for VOXZOGO in young children (BMRN)?

BioMarin cites extensive clinical exposure, reporting >10,000 patient-years and >5,000 infants/children treated worldwide. According to the company, this breadth of data supports an established efficacy and safety profile in the youngest patients.

How do VOXZOGO results affect clinical practice for achondroplasia in infants (BMRN)?

Results support earlier initiation to maximize growth and proportionality benefits, especially before age 2. According to the company, consensus guidance and multi-year data indicate earlier treatment increases the likelihood of improved height, arm span and other skeletal outcomes.