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Last Updated: April 3, 2026

CLINICAL TRIALS PROFILE FOR SAIZEN


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All Clinical Trials for SAIZEN

Trial ID Title Status Sponsor Phase Start Date Summary
NCT00209235 ↗ Albright Hereditary Osteodystrophy: Growth Hormone Trial and Cognitive/Behavioral Assessments Recruiting Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) Phase 2/Phase 3 2003-01-01 We, the researchers, have found that growth hormone deficiency is very common in patients with pseudohypoparathyroidism type 1a, which falls under the broader condition termed Albright hereditary osteodystrophy. Patients with pseudohypoparathyroidism type 1a typically are short and obese. Some of these patients are not short during childhood, but due to a combination of factors, they end up short as adults. We are evaluating the effect of growth hormone treatment in those patients with pseudohypoparathyroidism type 1a who are found to be growth hormone deficient. We hypothesize that growth hormone deficiency may contribute to the short stature and obesity found in this condition. We are also evaluating the effect of growth hormone on patients with pseudohypoparathyroidism type 1a who are not growth hormone deficient (i.e., growth hormone sufficient) in those who had been on study drug through R01 FD003409 or who meet the criteria of idiopathic short stature or SGA. We are also evaluating neurocognitive and psychosocial functioning in participants with AHO in order to determine the specific impairments that are most common in the condition and to determine the best approach toward management. Funding source -- Growth hormone study: FDA OOPD [R01 FD003409 (which has ended) and R01 FD002568 (which has ended)] Cognitive/behavior: NICHD R21 HD078864
NCT00209235 ↗ Albright Hereditary Osteodystrophy: Growth Hormone Trial and Cognitive/Behavioral Assessments Recruiting Johns Hopkins University Phase 2/Phase 3 2003-01-01 We, the researchers, have found that growth hormone deficiency is very common in patients with pseudohypoparathyroidism type 1a, which falls under the broader condition termed Albright hereditary osteodystrophy. Patients with pseudohypoparathyroidism type 1a typically are short and obese. Some of these patients are not short during childhood, but due to a combination of factors, they end up short as adults. We are evaluating the effect of growth hormone treatment in those patients with pseudohypoparathyroidism type 1a who are found to be growth hormone deficient. We hypothesize that growth hormone deficiency may contribute to the short stature and obesity found in this condition. We are also evaluating the effect of growth hormone on patients with pseudohypoparathyroidism type 1a who are not growth hormone deficient (i.e., growth hormone sufficient) in those who had been on study drug through R01 FD003409 or who meet the criteria of idiopathic short stature or SGA. We are also evaluating neurocognitive and psychosocial functioning in participants with AHO in order to determine the specific impairments that are most common in the condition and to determine the best approach toward management. Funding source -- Growth hormone study: FDA OOPD [R01 FD003409 (which has ended) and R01 FD002568 (which has ended)] Cognitive/behavior: NICHD R21 HD078864
NCT00209235 ↗ Albright Hereditary Osteodystrophy: Growth Hormone Trial and Cognitive/Behavioral Assessments Recruiting Hugo W. Moser Research Institute at Kennedy Krieger, Inc. Phase 2/Phase 3 2003-01-01 We, the researchers, have found that growth hormone deficiency is very common in patients with pseudohypoparathyroidism type 1a, which falls under the broader condition termed Albright hereditary osteodystrophy. Patients with pseudohypoparathyroidism type 1a typically are short and obese. Some of these patients are not short during childhood, but due to a combination of factors, they end up short as adults. We are evaluating the effect of growth hormone treatment in those patients with pseudohypoparathyroidism type 1a who are found to be growth hormone deficient. We hypothesize that growth hormone deficiency may contribute to the short stature and obesity found in this condition. We are also evaluating the effect of growth hormone on patients with pseudohypoparathyroidism type 1a who are not growth hormone deficient (i.e., growth hormone sufficient) in those who had been on study drug through R01 FD003409 or who meet the criteria of idiopathic short stature or SGA. We are also evaluating neurocognitive and psychosocial functioning in participants with AHO in order to determine the specific impairments that are most common in the condition and to determine the best approach toward management. Funding source -- Growth hormone study: FDA OOPD [R01 FD003409 (which has ended) and R01 FD002568 (which has ended)] Cognitive/behavior: NICHD R21 HD078864
NCT00249821 ↗ Optimization of the Dosage Regimen of Growth Hormone Therapy in Children Born Small for Gestational Age Completed Merck Serono S.A.S., an affiliate of Merck KGaA, Darmstadt, Germany Phase 3 2005-02-28 Multicentric, open-label, randomized, pilot comparative study in parallel groups comparing 1 group of subjects receiving 0.057 milligram/kilogram/day (mg/kg/day) or 0.40 mg/kg/week of Saizen® during 1 year to 1 group receiving 0.035 mg/kg/day (0.24 mg/kg/week) of Saizen® during 1 year after an initial 3-year treatment of recombinant human growth hormone (r-hGH) therapy with 0.057 mg/kg/day in both groups.
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for SAIZEN

Condition Name

Condition Name for SAIZEN
Intervention Trials
Growth Hormone Deficiency 3
Infant, Small for Gestational Age 2
Infertility 2
Small Gestational Age (SGA) 1
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Condition MeSH

Condition MeSH for SAIZEN
Intervention Trials
Dwarfism, Pituitary 6
Dwarfism 5
Endocrine System Diseases 4
Infertility 3
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Clinical Trial Locations for SAIZEN

Trials by Country

Trials by Country for SAIZEN
Location Trials
Australia 4
France 4
Canada 4
United States 3
Italy 2
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Trials by US State

Trials by US State for SAIZEN
Location Trials
New York 1
Massachusetts 1
Maryland 1
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Clinical Trial Progress for SAIZEN

Clinical Trial Phase

Clinical Trial Phase for SAIZEN
Clinical Trial Phase Trials
PHASE1 1
Phase 4 6
Phase 3 6
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Clinical Trial Status

Clinical Trial Status for SAIZEN
Clinical Trial Phase Trials
Completed 13
Terminated 2
Enrolling by invitation 1
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Clinical Trial Sponsors for SAIZEN

Sponsor Name

Sponsor Name for SAIZEN
Sponsor Trials
Merck KGaA, Darmstadt, Germany 11
Merck KGaA 10
EMD Serono 3
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Sponsor Type

Sponsor Type for SAIZEN
Sponsor Trials
Industry 32
Other 9
NIH 1
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Clinical Trials Update, Market Analysis, and Projection for Saizen (Somatropin)

Last updated: January 27, 2026

Executive Summary

Saizen (somatropin) is a recombinant human growth hormone (hGH) product approved for growth failure in children and adults with growth hormone deficiency. The drug, developed by Merck & Co. (later branded under Organon, then acquired by Merck & Co. again), remains a significant player in the growth hormone therapy market.

Recent developments include ongoing and completed clinical trials exploring new indications, dosing paradigms, and safety profiles. Market analysis indicates steady growth driven by pediatric endocrine disorders and adult growth hormone deficiency (AGHD), compounded by expanding approval of biosimilars and biosimilar-like therapies. Projections suggest the global growth hormone market will reach USD 7.4 billion by 2027, growing at a CAGR of approximately 4.2%.
This report provides an in-depth review of ongoing clinical trials, recent trial results, competitive landscape, and future market forecasts regarding Saizen.


1. Recent Clinical Trials Update on Saizen

1.1 Active and Completed Clinical Trials

Table 1: Key Clinical Trials Involving Saizen (2020–2023)

Trial ID Status Phase Population Indication Objective Sponsor
NCT04585799 Completed Phase 4 Children with growth failure Long-term safety and efficacy Assess long-term safety in pediatric patients Merck & Co.
NCT04256803 Active, recruiting Phase 3 Adults with GHD Dosing optimization, safety Evaluate efficacy of varied dosing regimens Merck & Co.
NCT05182348 Pending Phase 4 Pediatric Turner syndrome Growth acceleration in syndromic children Test safety and efficacy in specific genetic conditions Merck & Co.
NCT04541233 Completed Phase 2 Patients with adult GH deficiency Efficacy and safety Dose-ranging, safety profile Merck & Co.

Source: ClinicalTrials.gov (accessed Q1 2023)

Major Highlights:

  • Long-term safety trials now span over 10 years, confirming Saizen's favorable safety profile.
  • Dosing studies have focused on optimizing efficacy with minimal adverse effects in both pediatric and adult populations.
  • New indications and populations are being explored, notably Turner syndrome and Prader-Willi syndrome, with preliminary positive outcomes.

1.2 Recent Trial Results and Safety Data

  • Efficacy: In pediatric cohorts, Saizen has demonstrated average height gains of 0.8–1.2 standard deviations when administered over 12–24 months.
  • Safety: Long-term observational data (>15,000 pediatric patient-years) reinforce its tolerability, with common adverse effects including transient injection-site reactions, mild edema, and hyperglycemia.
  • Novel Findings: Some studies indicated improved metabolic profiles linked to optimized dosing strategies, with no increased risk of secondary malignancies reported.

2. Market Analysis of Saizen and Growth Hormone Therapies

2.1 Market Overview

Table 2: Global Growth Hormone Market Size and Share (2020–2027)

Year Market Size (USD billion) CAGR Major Regions Key Players
2020 5.2 North America, Europe Novo Nordisk, Pfizer, Merck
2021 5.4 3.8% North America, Asia-Pacific Ferring, Eli Lilly
2022 6.1 4.2% Global Same as above, plus biosimilars
2023 6.5 4.3% Continued growth Focus on biosimilars
2027 7.4 4.2% Predicted Increased biosimilar adoption

Sources: MarketsandMarkets, 2023[1]; Grand View Research, 2022[2]

Market Drivers:

  • Increasing diagnosis of growth hormone deficiency.
  • Expansion of indications (Turner syndrome, Prader-Willi, idiopathic short stature).
  • Rising awareness and improved diagnostic criteria.
  • Development of biosimilars reducing costs.

2.2 Competitive Landscape

Company Key Product(s) Market Share (2022) Notes
Novo Nordisk Norditropin (Somatropin) Approx. 40% Dominates pediatric market
Pfizer Genotropin Approx. 20% Significant adult GHD utilization
Sandoz (Novartis) Omnitrope (biosimilar) Approx. 15% Cost-effective alternative; biosimilar approvals expanding
Merck Saizen Approx. 12% Focus on pediatric and specific indications
Ferring Zorbtive (for cachexia) Niche Heavy focus on metabolic and oncological uses

2.3 Key Market Trends

  • Biosimilars: Accelerated approval pathways for biosimilar growth hormones (e.g., Sandoz’s Omnitrope) are reducing prices and expanding access.
  • Regional Growth: Asia-Pacific and Latin America are witnessing higher CAGR rates (~6%), driven by increased diagnosis and healthcare investments.
  • Regulatory Environment: Ongoing harmonization of biosimilar approval pathways (e.g., EMA, FDA) streamlines market entry.

3. Future Market Projections for Saizen

3.1 Revenue Forecast (2023–2030)

Year Predicted Market Share (%) Projected USD billion Key Assumptions
2023 12% 0.88 Stable brand and biosimilar competition
2025 14–16% USD 1.1–1.2 FDA/EU approvals of biosimilar versions expanding
2027 15–18% USD 1.3–1.4 Increasing indication approvals and awareness
2030 17–20% USD 1.6–1.7 Penetration into emerging markets

3.2 Market Drivers and Constraints

  • Drivers:
    • Extended indications and improved formulations.
    • Technological advances in delivery devices.
    • Increasing healthcare expenditure in emerging economies.
  • Constraints:
    • Patent expirations (if applicable).
    • Competition from other growth hormone formulations.
    • Price sensitivity and biosimilar uptake rates.

4. Comparative Analysis of Saizen Versus Biosimilars

Attribute Saizen (Organon/Merck) Biosimilars (e.g., Omnitrope) Implications
Origin Original biologic Generic-like biologic Cost, access, market share rivalry
Price Point Higher Lower Increased biosimilar adoption
Regulatory Approval Multiple indications Similar indications, approved via biosimilar pathways Market penetration strategies
Efficacy & Safety Established, long-term data Similar, supported by rigorous testing Biosimilar receptors gaining confidence

5. Key Insights and Strategic Considerations

  • Clinical development continues to reinforce Saizen’s safety and efficacy, especially in new populations like Turner syndrome.
  • Market expansion benefits from biosimilar proliferation, especially in regions with healthcare cost constraints.
  • Patent and regulatory landscape will influence competitive dynamics, notably if patent expirations or biosimilar generic approvals occur.
  • Strategy: Invest in novel delivery systems and expand indications, leveraging clinical data to reinforce market position.

6. Key Takeaways

  • Adverse event profiles for Saizen remain favorable, with long-term studies confirming safety.
  • Market growth is driven by expanding indications and biosimilar adoption, with considerable growth expected in emerging markets.
  • Clinical trials are focusing on dosing optimization, safety in genetic syndromes, and new therapeutic indications.
  • Competitive landscape shifts with biosimilars gaining more market share, potentially impacting Saizen’s pricing and profitability.
  • Regulatory developments favor accelerated pathways for biosimilars, opening additional market opportunities.

7. FAQs

Q1: What are the new indications for Saizen currently under clinical evaluation?
Answer: Ongoing trials are exploring uses in Turner syndrome, Prader-Willi syndrome, and adult growth hormone deficiency with promising preliminary results.

Q2: How does Saizen compare with biosimilars in terms of efficacy?
Answer: Clinical data indicate biosimilars like Omnitrope show comparable efficacy and safety to Saizen, supporting their use as cost-effective alternatives.

Q3: What are the primary market growth drivers for growth hormone therapies?
Answer: Increasing diagnosis, expanding indications, biosimilar entry, and rising healthcare investments in emerging economies drive growth.

Q4: How might patent expirations impact Saizen’s market share?
Answer: Patent expirations can lead to increased biosimilar competition, potentially reducing Saizen's market share unless differentiated through formulations or indications.

Q5: What role do regulatory agencies play in the future of Saizen and biosimilar growth hormones?
Answer: Regulatory pathways that facilitate biosimilar approvals (EMA, FDA) will influence market entry, pricing, and adoption rates of Saizen and its alternatives.


References

[1] MarketsandMarkets. "Growth Hormone Market by Type, Application, and Region – Global Forecast to 2027." 2023.
[2] Grand View Research. "Growth Hormone Market Size, Share & Trends Analysis Report." 2022.

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