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Takeda’s TAKHZYRO® (lanadelumab) Demonstrated Positive Results in the Prevention of HAE Attacks in First and Only Open-Label Phase 3 Trial in Children Ages 2 to <12 Years

  • Children Ages 2 to <12 Experienced 94.8% Fewer Hereditary Angioedema (HAE) Attacks During Treatment with TAKHZYRO Over the 52-Week Treatment Period Compared to Baseline
  • Late-Breaking Flash Talk Presentation of Phase 3 Data Highlights Positive, Clinically Meaningful Results in Children <6 Years, Where No Long-Term Prophylaxis Treatment (LTP) is Currently Approved
  • Results are Consistent with the Favorable Efficacy and Safety Profile of TAKHZYRO Observed in Adult and Adolescent Patients in Earlier Studies
  • Global Regulatory Filings to Begin in Fiscal Year 2022

OSAKA, Japan and CAMBRIDGE, Mass., July 1, 2022 –  Takeda (TSE:4502/NYSE:TAK) today announced late-breaking data from the Phase 3 SPRING study (NCT04070326) presented at the European Academy of Allergy and Clinical Immunology (EAACI) Hybrid Congress 2022, demonstrating positive results of TAKHZYRO® (lanadelumab) for preventing hereditary angioedema (HAE) attacks in patients 2 to <12 years of age, which were consistent with earlier studies in adult and adolescent patients.1 There are currently no long-term prophylactic (LTP) treatments approved for HAE patients younger than 6 years.2, 3, 4, 5

The primary objective of the open-label, multicenter, Phase 3 SPRING study was to evaluate the safety and pharmacokinetics (PK) of TAKHZYRO in patients aged 2 to <12 years with HAE. Clinical outcomes (prevention of HAE attacks) were measured as a secondary objective.

“HAE is a rare condition where unpredictable symptoms like severely debilitating swelling can take a toll on children both physically and emotionally,” said Dr. Marcus Maurer, Professor of Dermatology and Allergy Charité – Universitätsmedizin Berlin, Germany and principal investigator of the SPRING study. “In the SPRING study, we saw a majority of children who had been suffering nearly two HAE attacks per month on average at baseline, who were then attack-free throughout the 52-week trial of treatment with TAKHZYRO.”

In this study, HAE patients received a dose of 150 milligrams (mg) every 4 weeks in patients 2 to <6 years and every 2 weeks in patients aged 6 to <12 years.1 TAKHZYRO reduced the rate of HAE attacks in children by a mean of 94.8% compared to baseline, from 1.84 attacks per month to 0.08 attacks during treatment.1 The majority of patients (76.2%) were attack-free during the 52-week treatment period with an average of 99.5% attack-free days.1 No deaths or serious treatment-emergent adverse events (TEAEs) were reported during the study, and no patients withdrew from the study due to TEAEs.1 The most commonly reported TEAE was injection site pain, and most TEAEs were mild or moderate in severity.6 These results are consistent with the favorable efficacy and safety profile of TAKHYZRO observed in earlier studies with adult and adolescent patients.1,7,8

HAE attacks, which can involve serious and severely debilitating swelling in the abdomen, face, feet, genitals, hands and throat, may occur very early in childhood. Potentially fatal upper airway angioedema has been reported in patients as young as 3 years old.9,10 HAE diagnosis can take an average of 8.4 years after symptom onset.8 Among adults living with HAE, 50% of patients experience anxiety, 34% experience difficulty with social activity and 58% report symptoms negatively affect career advancements.11

“The SPRING study data reinforce the safety and efficacy of TAKHZYRO across a broad range of patients living with HAE,” said Ming Yu, Global Clinical Lead, Takeda. “We are encouraged by these findings as they demonstrate the potential of long-term prophylaxis treatments to reduce recurrent HAE attacks in children as young as two who currently have no approved long-term preventative treatment option.”

Results From the Open-label, Multicenter Phase 3 SPRING study” include:1

  • Overall, the attack rate during lanadelumab treatment was reduced by ~95% versus baseline.
    • The extent of reduction was similar between patients who received 150 mg lanadelumab q4w or q2w.
  • Systemic exposure to lanadelumab was demonstrated.
  • Compared with adults and older adolescents who received 300 mg q2w:
    • Steady-state exposure with 150 mg q2w in patients aged 6 to <12 years was similar.
    • Minimum steady-state concentrations with 150 mg q4w were 50–60% lower in patients aged 2 to <6 years but were sufficient to produce a clinically meaningful treatment response.
  • 16 (76.2%) patients were attack-free during the full treatment period.
  • A mean (range) of 99.5% (96.4–100) of days were attack-free.
  • Overall, 17 (81.0%) patients reported any TEAEs.
    • 7 (33.3%) patients reported any TEAE related to treatment; all were related to the injection site.
    • The profile of related TEAEs was similar between the two treatment groups.
    • There were no deaths, serious TEAEs, hospitalisations or discontinuations due to TEAEs.
  • There were no adverse events of special interest (hypersensitivity reactions, hypercoagulability and bleeding events).
  • No clinically meaningful safety findings were identified with respect to clinical laboratory tests or vital signs.


These data will be submitted to global regulatory authorities to evaluate a potential label expansion for TAKHZYRO to include the younger patient population.

Takeda will have a total of 11 presentations at EAACI:

  • Efficacy and Safety of Lanadelumab in Pediatric Patients Aged 2 to <12 years With Hereditary Angioedema: Results From the Open-Label, Multicenter Phase 3 SPRING Study
  • Real-world effectiveness and safety of lanadelumab in patients with hereditary angioedema: interim findings from the ENABLE Study
  • Lanadelumab treatment patterns among patients with HAE-C1-INH: Interim analysis of the ENABLE study
  • Patient-reported outcomes (PROs) in patients with hereditary angioedema receiving lanadelumab: Interim findings from the ENABLE Study
  • Lanadelumab safety and efficacy in hereditary angioedema after switching from prior long-term prophylaxis: Analysis from the HELP OLE study
  • Attack Rate Reduction After Switching to Lanadelumab Therapy in Patients with Hereditary Angioedema (HAE): Interim Findings from EMPOWER
  • Attack-Free Status by prior LTP use in the HELP OLE: Long-term lanadelumab prophylactic treatment for 12 months or longer
  • Real-world effectiveness and disease management data in European patients with HAE on long-term prophylaxis with lanadelumab: an interim analysis
  • An international physician real-world practice patterns survey evaluating the burden of illness in hereditary angioedema Type I/II
  • Frequency of HAE attacks, clinical outcomes, and quality of life for patients prescribed lanadelumab and other prophylaxis: analysis of real-world patient data
  • Plasma proteomic analyses from patients with hereditary angioedema due to C1 inhibitor deficiency before and following lanadelumab treatment


For additional details on the data presented across Takeda’s portfolio of HAE medicines at EAACI, visit the congress website.

About SPRING Study

SHP643-301, also known as the SPRING study, is a multicenter, open-label Phase 3 study to evaluate the safety and pharmacokinetics (PK) of TAKHZYRO in patients aged 2 to <12 years with HAE.1 Participants aged 2 to <6 years received lanadelumab at a dose of 150 milligrams (mg) every 4 weeks (q4wks) over a 52-week treatment period. Participants aged 6 to <12 years received lanadelumab at a dose of 150 mg every 2 weeks (q2wks) over a 52-week treatment period and had the option to reduce the dose frequency to q4wks if they were well controlled (e.g., attack-free) for 26 weeks.1 HAE attack rates were analysed using descriptive statistics.1


About TAKHZYRO® (lanadelumab-flyo) Injection

TAKHZYRO is a fully human monoclonal antibody that specifically binds and decreases plasma kallikrein and is indicated for routine prevention of recurrent attacks of HAE in patients aged 12 years and older. It was studied in one of the largest prevention studies in HAE with the longest active treatment duration, and TAKHZYRO consistently demonstrated HAE attack reduction. TAKHZYRO is formulated for subcutaneous administration and has a half-life of approximately two weeks.8 TAKHZYRO is intended for self-administration or administration by a caregiver once trained by a healthcare professional.


TAKHZYRO Safety Information for Europe 
Please consult the TAKHZYRO Summary Product Characteristics (SmPC) before prescribing.   

TAKHZYRO treatment should be initiated under the supervision of a physician experienced in the management of patients with hereditary angioedema (HAE). TAKHZYRO may be self-administered or administered by a caregiver only after training on SC injection technique by a healthcare professional. 

Hypersensitivity to the active substance or to any of the excipients.8 

Warnings and Precautions 
Traceability: In order to improve the traceability of biological medicinal products, the name and the batch number of the administered product should be clearly recorded.8 

Hypersensitivity reactions have been observed. In case of a severe hypersensitivity reaction, administration of TAKHZYRO must be stopped immediately and appropriate treatment must be initiated.8 

General: TAKHZYRO is not intended for treatment of acute HAE attacks. In case of a breakthrough HAE attack, individualized treatment should be initiated with an approved rescue medication. There are no available clinical data on the use of lanadelumab in HAE patients with normal C1-INH activity.5

Interference with coagulation test: Lanadelumab can increase activated partial thromboplastin time (aPTT) due to an interaction of lanadelumab with the aPTT assay. The reagents used in the aPTT laboratory test initiate intrinsic coagulation through the activation of plasma kallikrein in the contact system. Inhibition of plasma kallikrein by lanadelumab can increase aPTT in this assay. None of the increases in aPTT in patients treated with TAKHZYRO were associated with abnormal bleeding adverse events. There were no differences in international normalised ratio (INR) between treatment groups.8

Sodium content: This medicinal product contains less than 1 mmol sodium (23 mg) per vial, that is to say essentially 'sodium-free'.8 

No dedicated drug-drug interaction studies have been conducted. Based on the characteristics of lanadelumab, no pharmacokinetic interactions with co-administered medicinal products is expected. 

As expected, concomitant use of the rescue medication C1 esterase inhibitor results in an additive effect on lanadelumab-cHMWK response based on the mechanism of action (MOA) of lanadelumab and C1 esterase inhibitor.8 


Treatment with lanadelumab has been associated with development of treatment emergent anti-drug antibodies (ADA) in 11.9% (10/84) of subjects. All antibody titres were low. The ADA response was transient in 20% (2/10) of ADA positive subjects. 2.4% (2/84) of lanadelumab-treated subjects tested positive for neutralizing antibodies.8 

The development of ADA including neutralising antibodies against TAKHZYRO did not appear to adversely affect the pharmacokinetic (PK) and pharmacodynamics (PD) profiles or clinical response.5 


The most commonly observed adverse reaction (52.4%) associated with TAKHZYRO was injection site reactions (ISR) including injection site pain, injection site erythema and injection site bruising. Of these ISRs, 97% were of mild intensity, 90% resolved within 1 day after onset with a median duration of 6 minutes.8 

Hypersensitivity reaction (mild and moderate pruritus, discomfort and tingling of tongue) was observed (1.2%)8 

Very common 
(frequency ≥1/10): 

Injection site reactions* 

(≥1/100 to <1/10): 

Hypersensitivity**, dizziness, rash maculo-papular, myalgia, alanine aminotransferase increased, aspartate aminotransferase increased. 

*Injection site reactions include: pain, erythema, bruising, discomfort, haematoma, haemorrhage, pruritus, swelling, induration, paraesthesia, reaction, warmth, oedema and rash.8 

** Hypersensitivity includes: pruritus, discomfort and tingling of tongue.8 

Editor Details

  • Name:
    • Julia Loring
Last Updated: 04-Jul-2022