A Follow-up Study of Mezagitamab in Adults With Chronic Primary Immune Thrombocytopenia

Condition(s) studied

Investigational drug(s) / intervention(s)

Mezagitamab: Mezagitamab injection administered SC.

Study summary

Primary immune thrombocytopenia (ITP) is a condition where the immune system mistakenly destroys platelets, which are cells that help stop bleeding. This leads to a lower number of platelets, making it easier to bruise or bleed. The main aim of this study is to check how safe mezagitamab is and how well it is tolerated by adults with chronic primary ITP, if given over a longer time. Other aims are to learn how effective treatment with mezagitamab is and how the body processes it (called pharmacokinetics or PK) over a longer time.

Participants of the following previous mezagitamab studies will be invited to join this continuation study: TAK-079-3002 and TAK-079-1004. In this continuation study, participants will receive mezagitamab when certain protocol criteria are met.

During the study, participants will visit their study clinic several times.

Eligibility

Primary outcome measure(s)

• Number of Participants With Treatment-Emergent Adverse Events (TEAEs) and Serious TEAEs — Up to approximately 108 weeks
  An adverse event (AE) is any untoward medical occurrence in a clinical trial participant, temporally associated with the use of the trial intervention, whether or not the occurrence is considered related to the trial intervention. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of the trial intervention. TEAEs are defined as AEs with start dates at the time of or following the first exposure to mezagitamab in the parent trial for Cohort 1 and in this trial for Cohort 2. A serious TEAE is a TEAE that meets 1 or more of the criteria: results in death, is life threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in persistent or significant disability/incapacity, is a congenital anomaly/birth defect or was otherwise considered medically important.
• Number of Participants With TEAEs Leading to Permanent Withdrawal of Mezagitamab — Up to approximately 108 weeks
  An AE is any untoward medical occurrence in a clinical trial participant, temporally associated with the use of the trial intervention, whether or not the occurrence is considered related to the trial intervention. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of the trial intervention. TEAEs are defined as AEs with start dates at the time of or following the first exposure to mezagitamab in the parent trial for Cohort 1 and in this trial for Cohort 2.

Trial sites (118)

+ 78 more sites — see the full list on the official registry below.

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