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    Clinical Trial Results:
    A Phase 3, Open-label, Non-controlled, Extension Study to Evaluate the Long-term Safety of TAK-771 in Japanese Patients with Primary Immunodeficiency Disease (PID)

    Summary
    EudraCT number
    2022-003621-21
    Trial protocol
    Outside EU/EEA  
    Global end of trial date
    30 Oct 2025

    Results information
    Results version number
    v1(current)
    This version publication date
    09 May 2026
    First version publication date
    09 May 2026
    Other versions

    Trial information

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    Trial identification
    Sponsor protocol code
    TAK-771-3005
    Additional study identifiers
    ISRCTN number
    -
    US NCT number
    NCT05513586
    WHO universal trial number (UTN)
    -
    Sponsors
    Sponsor organisation name
    Takeda
    Sponsor organisation address
    95 Hayden Avenue, Lexington, United States, MA 02421
    Public contact
    Study Director, Takeda, TrialDisclosures@takeda.com
    Scientific contact
    Study Director, Takeda, TrialDisclosures@takeda.com
    Paediatric regulatory details
    Is trial part of an agreed paediatric investigation plan (PIP)
    No
    Does article 45 of REGULATION (EC) No 1901/2006 apply to this trial?
    No
    Does article 46 of REGULATION (EC) No 1901/2006 apply to this trial?
    Yes
    Results analysis stage
    Analysis stage
    Final
    Date of interim/final analysis
    30 Oct 2025
    Is this the analysis of the primary completion data?
    No
    Global end of trial reached?
    Yes
    Global end of trial date
    30 Oct 2025
    Was the trial ended prematurely?
    No
    General information about the trial
    Main objective of the trial
    The main purpose of the trial is to evaluate the long-term safety of TAK-771 in Japanese participants with PID.
    Protection of trial subjects
    Participant signed an informed consent form (ICF) before participating in the study.
    Background therapy
    -
    Evidence for comparator
    -
    Actual start date of recruitment
    13 Sep 2022
    Long term follow-up planned
    No
    Independent data monitoring committee (IDMC) involvement?
    No
    Population of trial subjects
    Number of subjects enrolled per country
    Country: Number of subjects enrolled
    Japan: 15
    Worldwide total number of subjects
    15
    EEA total number of subjects
    0
    Number of subjects enrolled per age group
    In utero
    0
    Preterm newborn - gestational age < 37 wk
    0
    Newborns (0-27 days)
    0
    Infants and toddlers (28 days-23 months)
    0
    Children (2-11 years)
    4
    Adolescents (12-17 years)
    1
    Adults (18-64 years)
    10
    From 65 to 84 years
    0
    85 years and over
    0

    Subject disposition

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    Recruitment
    Recruitment details
    A total of 15 participants with primary immunodeficiency diseases (PID) took part in the study in Japan from 13 Sep 2022 to 30 Oct 2025.

    Pre-assignment
    Screening details
    Participants who completed the study TAK-771-3004 (NCT05150340) were enrolled in this extension study and continued to receive TAK-771.

    Period 1
    Period 1 title
    Overall Study (overall period)
    Is this the baseline period?
    Yes
    Allocation method
    Not applicable
    Blinding used
    Not blinded

    Arms
    Arm title
    TAK-771
    Arm description
    Participants continued TAK-771 (Immune Globulin Infusion [IGI] 10% + Recombinant Human Hyaluronidase [rHuPH20]) administration at the same dose and frequency they had in the Study TAK-771-3004 (NCT05150340) with dosing intervals of either 3 or 4 weeks, until the commercial TAK-771 becomes available at each study site or study termination. Participants received subcutaneous (SC) infusion of rHuPH20 solution first at a dose of 80 units per gram (U/g), followed by SC infusion of 10 percentage (%) IGI within 10 minutes of completion of the infusion of rHuPH20 solution. The dose of TAK-771 was adjusted to maintain the target immunoglobulin G (IgG) trough level of greater than or equal to (>=) 5 gram per litre (g/L).
    Arm type
    Experimental

    Investigational medicinal product name
    TAK-771 [IGI + rHuPH20]
    Investigational medicinal product code
    Other name
    Pharmaceutical forms
    Solution for infusion
    Routes of administration
    Subcutaneous use
    Dosage and administration details
    TAK-771 SC infusion.

    Number of subjects in period 1
    TAK-771
    Started
    15
    Completed
    12
    Not completed
    3
         Consent withdrawn by subject
    2
         Adverse event, non-fatal
    1

    Baseline characteristics

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    Baseline characteristics reporting groups
    Reporting group title
    TAK-771
    Reporting group description
    Participants continued TAK-771 (Immune Globulin Infusion [IGI] 10% + Recombinant Human Hyaluronidase [rHuPH20]) administration at the same dose and frequency they had in the Study TAK-771-3004 (NCT05150340) with dosing intervals of either 3 or 4 weeks, until the commercial TAK-771 becomes available at each study site or study termination. Participants received subcutaneous (SC) infusion of rHuPH20 solution first at a dose of 80 units per gram (U/g), followed by SC infusion of 10 percentage (%) IGI within 10 minutes of completion of the infusion of rHuPH20 solution. The dose of TAK-771 was adjusted to maintain the target immunoglobulin G (IgG) trough level of greater than or equal to (>=) 5 gram per litre (g/L).

    Reporting group values
    TAK-771 Total
    Number of subjects
    15
    Age Categorical
    Units: Subjects
    Age continuous
    Units: years
        arithmetic mean (standard deviation)
    22.7 ( 14.19 ) -
    Gender categorical
    Units: Subjects
        Female
    5 5
        Male
    10 10
    Race (NIH/OMB)
    Units: Subjects
        American Indian or Alaska Native
    0 0
        Asian
    15 15
        Native Hawaiian or Other Pacific Islander
    0 0
        Black or African American
    0 0
        White
    0 0
        More than one race
    0 0
        Unknown or Not Reported
    0 0
    Ethnicity (NIH/OMB)
    Units: Subjects
        Hispanic or Latino
    0 0
        Not Hispanic or Latino
    15 15
        Unknown or Not Reported
    0 0

    End points

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    End points reporting groups
    Reporting group title
    TAK-771
    Reporting group description
    Participants continued TAK-771 (Immune Globulin Infusion [IGI] 10% + Recombinant Human Hyaluronidase [rHuPH20]) administration at the same dose and frequency they had in the Study TAK-771-3004 (NCT05150340) with dosing intervals of either 3 or 4 weeks, until the commercial TAK-771 becomes available at each study site or study termination. Participants received subcutaneous (SC) infusion of rHuPH20 solution first at a dose of 80 units per gram (U/g), followed by SC infusion of 10 percentage (%) IGI within 10 minutes of completion of the infusion of rHuPH20 solution. The dose of TAK-771 was adjusted to maintain the target immunoglobulin G (IgG) trough level of greater than or equal to (>=) 5 gram per litre (g/L).

    Primary: Percentage of Participants with Treatment-Emergent Adverse Events (TEAEs)

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    End point title
    Percentage of Participants with Treatment-Emergent Adverse Events (TEAEs) [1]
    End point description
    An Adverse event (AE) was any untoward medical occurrence in a clinical investigation participant administered a pharmaceutical product that does not necessarily have a causal relationship with this treatment. An AE can therefore be any unfavorable and unintended sign (including a clinically significant laboratory finding), symptom, or disease temporally associated with the use of a investigational product, whether or not causality is suspected. A TEAE was defined as any event emerging or manifesting at or after the initiation of treatment with an investigational product or medicinal product or any existing event that worsened in either intensity or frequency following exposure to the investigational product. EXSAS included all enrolled participants who received investigational drug in Study TAK-771-3005 at least once.
    End point type
    Primary
    End point timeframe
    From start of study drug administration up to end of study (up to 3.1 years)
    Notes
    [1] - No statistical analyses have been specified for this primary end point. It is expected there is at least one statistical analysis for each primary end point.
    Justification: All analysis was descriptive only and no formal hypothesis testing was done.
    End point values
    TAK-771
    Number of subjects analysed
    15
    Units: percentage of participants
        number (not applicable)
    100
    No statistical analyses for this end point

    Primary: Percentage of Participants who Developed Anti-rHuPH20 Binding Antibody Titers of >=1:160 and Neutralizing Antibodies to rHuPH20

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    End point title
    Percentage of Participants who Developed Anti-rHuPH20 Binding Antibody Titers of >=1:160 and Neutralizing Antibodies to rHuPH20 [2]
    End point description
    Participants who developed anti-rHuPH20 binding antibody titers of >=1:160 and neutralizing antibodies to rHuPH20 was reported. EXSAS included all enrolled participants who received investigational drug in Study TAK-771-3005 at least once.
    End point type
    Primary
    End point timeframe
    From start of study drug administration up to end of study (up to 3.1 years)
    Notes
    [2] - No statistical analyses have been specified for this primary end point. It is expected there is at least one statistical analysis for each primary end point.
    Justification: All analysis was descriptive only and no formal hypothesis testing was done.
    End point values
    TAK-771
    Number of subjects analysed
    15
    Units: percentage of participants
    number (not applicable)
        Anti-rHuPH20 Binding Antibody Titers of >=1:160
    0
        Neutralizing Antibodies
    0
    No statistical analyses for this end point

    Adverse events

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    Adverse events information
    Timeframe for reporting adverse events
    From start of study drug administration up to end of study (up to 3.1 years)
    Adverse event reporting additional description
    EXSAS included all enrolled participants who received investigational drug in Study TAK-771-3005 at least once.
    Assessment type
    Systematic
    Dictionary used for adverse event reporting
    Dictionary name
    MedDRA
    Dictionary version
    28.1
    Reporting groups
    Reporting group title
    TAK-771
    Reporting group description
    Participants continued TAK-771 (IGI 10% + rHuPH20) administration at the same dose and frequency they had in the Study TAK-771-3004 (NCT05150340) with dosing intervals of either 3 or 4 weeks, until the commercial TAK-771 becomes available at each study site or study termination. Participants received SC infusion of rHuPH20 solution first at a dose of 80 U/g, followed by SC infusion of 10% IGI within 10 minutes of completion of the infusion of rHuPH20 solution. The dose of TAK-771 was adjusted to maintain the target IgG trough level of >=5 g/L.

    Serious adverse events
    TAK-771
    Total subjects affected by serious adverse events
         subjects affected / exposed
    6 / 15 (40.00%)
         number of deaths (all causes)
    0
         number of deaths resulting from adverse events
    0
    Injury, poisoning and procedural complications
    Joint dislocation
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Eye disorders
    Eyelid ptosis
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Gastrointestinal disorders
    Diarrhoea
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Inflammatory bowel disease
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Vomiting
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Endocrine disorders
    Adrenal insufficiency
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences causally related to treatment / all
    0 / 4
         deaths causally related to treatment / all
    0 / 0
    Infections and infestations
    COVID-19
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Pneumonia
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Metabolism and nutrition disorders
    Hypoglycaemia
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences causally related to treatment / all
    0 / 1
         deaths causally related to treatment / all
    0 / 0
    Frequency threshold for reporting non-serious adverse events: 5%
    Non-serious adverse events
    TAK-771
    Total subjects affected by non serious adverse events
         subjects affected / exposed
    15 / 15 (100.00%)
    General disorders and administration site conditions
    Administration site erythema
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    2
    Infusion site erythema
         subjects affected / exposed
    2 / 15 (13.33%)
         occurrences all number
    27
    Administration site pruritus
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Infusion site swelling
         subjects affected / exposed
    2 / 15 (13.33%)
         occurrences all number
    14
    Injection site erythema
         subjects affected / exposed
    4 / 15 (26.67%)
         occurrences all number
    23
    Injection site induration
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    24
    Injection site reaction
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Injection site pruritus
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Injection site pain
         subjects affected / exposed
    4 / 15 (26.67%)
         occurrences all number
    44
    Injection site swelling
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Malaise
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Pyrexia
         subjects affected / exposed
    7 / 15 (46.67%)
         occurrences all number
    26
    Thirst
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    11
    Immune system disorders
    Seasonal allergy
         subjects affected / exposed
    2 / 15 (13.33%)
         occurrences all number
    2
    Reproductive system and breast disorders
    Oedema genital
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Respiratory, thoracic and mediastinal disorders
    Cough
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Bronchiectasis
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    4
    Asthma
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Nasal congestion
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Oropharyngeal pain
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Rhinorrhoea
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    2
    Upper respiratory tract inflammation
         subjects affected / exposed
    2 / 15 (13.33%)
         occurrences all number
    3
    Psychiatric disorders
    Anxiety disorder
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Investigations
    Liver function test increased
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Injury, poisoning and procedural complications
    Arthropod bite
         subjects affected / exposed
    2 / 15 (13.33%)
         occurrences all number
    2
    Contusion
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    2
    Joint dislocation
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Scratch
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Procedural pain
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Nervous system disorders
    Sensory disturbance
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Headache
         subjects affected / exposed
    3 / 15 (20.00%)
         occurrences all number
    4
    Dizziness
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Blood and lymphatic system disorders
    Anaemia
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Iron deficiency anaemia
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Ear and labyrinth disorders
    Deafness neurosensory
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Eye disorders
    Conjunctivitis allergic
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Keratitis interstitial
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Gastrointestinal disorders
    Abdominal discomfort
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Constipation
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    2
    Dental caries
         subjects affected / exposed
    2 / 15 (13.33%)
         occurrences all number
    5
    Diarrhoea
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Dyspepsia
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Enteritis
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Gastric polyps
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Gastrooesophageal reflux disease
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Gingival pain
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    3
    Hiatus hernia
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Inflammatory bowel disease
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    2
    Large intestine polyp
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Lip dry
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Nausea
         subjects affected / exposed
    2 / 15 (13.33%)
         occurrences all number
    3
    Vomiting
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Stomatitis
         subjects affected / exposed
    2 / 15 (13.33%)
         occurrences all number
    2
    Skin and subcutaneous tissue disorders
    Drug eruption
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Erythema
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Pruritus
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Hand dermatitis
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Rash
         subjects affected / exposed
    2 / 15 (13.33%)
         occurrences all number
    2
    Vitiligo
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Endocrine disorders
    Autoimmune thyroiditis
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Musculoskeletal and connective tissue disorders
    Back pain
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Arthralgia
         subjects affected / exposed
    2 / 15 (13.33%)
         occurrences all number
    4
    Musculoskeletal pain
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    2
    Myalgia
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Neck pain
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    2
    Infections and infestations
    Gastroenteritis
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Conjunctivitis
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    COVID-19
         subjects affected / exposed
    6 / 15 (40.00%)
         occurrences all number
    6
    Hordeolum
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Influenza
         subjects affected / exposed
    4 / 15 (26.67%)
         occurrences all number
    5
    Nasopharyngitis
         subjects affected / exposed
    9 / 15 (60.00%)
         occurrences all number
    26
    Oral herpes
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    3
    Otitis externa
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Pharyngitis
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Pneumonia
         subjects affected / exposed
    2 / 15 (13.33%)
         occurrences all number
    2
    Respiratory syncytial virus infection
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Rhinitis
         subjects affected / exposed
    2 / 15 (13.33%)
         occurrences all number
    2
    Sinusitis
         subjects affected / exposed
    2 / 15 (13.33%)
         occurrences all number
    2
    Tinea versicolour
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Upper respiratory tract infection
         subjects affected / exposed
    3 / 15 (20.00%)
         occurrences all number
    10
    Metabolism and nutrition disorders
    Dehydration
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Hypokalaemia
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1
    Hypoglycaemia
         subjects affected / exposed
    1 / 15 (6.67%)
         occurrences all number
    1

    More information

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    Substantial protocol amendments (globally)

    Were there any global substantial amendments to the protocol? Yes
    Date
    Amendment
    24 May 2022
    The following updates were made: Assessments of serum trough concentrations of IgG subclasses were removed and description regarding delivery of study drugs from the site to participants home address was added.

    Interruptions (globally)

    Were there any global interruptions to the trial? No

    Limitations and caveats

    Limitations of the trial such as small numbers of subjects analysed or technical problems leading to unreliable data.
    None reported
    For support, Contact us.
    The status and protocol content of GB trials is no longer updated since 1 January 2021. For the UK, as of 31 January 2021, EU Law applies only to the territory of Northern Ireland (NI) to the extent foreseen in the Protocol on Ireland/NI. Legal notice
    As of 31 January 2023, all EU/EEA initial clinical trial applications must be submitted through CTIS . Updated EudraCT trials information and information on PIP/Art 46 trials conducted exclusively in third countries continues to be submitted through EudraCT and published on this website.

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