A Study Evaluating the Safety and Efficacy of Long-term Dosing of Romiplostim in Thrombocytopenic Pediatric Patients With Immune (Idiopathic) Thrombocytopenia Purpura

Phase 3CompletedNCT01071954

Amgen66 enrolled

Overview

This is an extension study designed to assess the safety and durability of platelet count increases with romiplostim treatment of thrombocytopenic patients with immune (Idiopathic) thrombocytopenia purpura. This study is available to pediatric patients who have completed a previous romiplostim ITP study and meet the eligibility criteria of this study.

Study Type

INTERVENTIONAL

Allocation

Purpose

SUPPORTIVE_CARE

Masking

NONE

Enrollment

Conditions

Thrombocytopenia in Pediatric Subjects With Immune Idiopathic Thrombocytopenic Purpura ITP

Interventions

RomiplostimBIOLOGICAL

Administered by subcutaneous injection once a week.

Eligibility

Sex: ALLMin age: 1 Year

Medical Language ↔ Plain English

Inclusion Criteria: * Subject or subject's legally acceptable representative has provided informed consent. * Subject completed a romiplostim study for the treatment of thrombocytopenia in pediatric subjects with ITP. Exclusion Criteria: * Subject has or previously had any bone marrow stem cell disorder (any abnormal bone marrow findings other than those typical of ITP must be approved by Amgen before a subject may be enrolled in the study). * Subject has any new active malignancy diagnosed since enrollment in the previous romiplostim ITP study. * Subject received any alkylating agents within four weeks before the screening visit or anticipated use during the time of the proposed study. * Other investigational medications are excluded. * Currently enrolled in another investigational device or drug study, or less than 30 days since ending another investigational device or drug study(s), or receiving other investigational agent(s) (with the exception of romiplostim in a previous clinical study). * Female subject of child bearing potential (defined as having first menses) is not willing to use highly effective contraception during treatment and for 4 weeks after the end of treatment. * Female subject is pregnant or breast feeding, or planning to become pregnant within 4 weeks after the end of treatment. * Subject has known sensitivity to any of the products to be administered during dosing. * Subject previously has entered this study (this will depend on the type of study). * Subject will not be available for protocol required study visits, to the best of the subject and investigator's knowledge. * Subject has any kind of disorder that, in the opinion of the investigator, may compromise the ability of the subject to give written informed consent and/or to comply with all required study procedures.

Locations (31)

Outcomes

Primary Outcomes

Number of Participants With Adverse Events

The adverse event (AE) severity grading scale used was the Common Terminology Criteria for Adverse Events (CTCAE) version 3.0 grading scale, where Grade 1 = Mild AE; Grade 2 = Moderate AE; Grade 3 = Severe AE; Grade 4 = Life-threatening or disabling AE; Grade 5 = Death related to AE. A serious adverse event was defined as an adverse event that met at least one of the following serious criteria: * fatal * life threatening (places the subject at immediate risk of death) * required in-patient hospitalization or prolongation of existing hospitalization * resulted in persistent or significant disability/incapacity * congenital anomaly/birth defect * other medically important serious event. The investigator assessed whether each adverse event was possibly related to the investigational product.

Time frame: From first dose of study drug until 1 week after last dose. The median (minimum, maximum) duration of treatment was 135.0 weeks (5, 363 weeks).

Duration Adjusted Rate of Treatment Emergent Adverse Events

Exposure adjusted rate was defined as the total number of events divided by the duration of time participants were under observation. The adverse event (AE) severity grading scale used was the Common Terminology Criteria for Adverse Events (CTCAE) version 3.0 grading scale, where Grade 1 = Mild AE; Grade 2 = Moderate AE; Grade 3 = Severe AE; Grade 4 = Life-threatening or disabling AE; Grade 5 = Death related to AE. A serious adverse event was defined as an adverse event that met at least one of the following serious criteria: * fatal * life threatening (places the subject at immediate risk of death) * required in-patient hospitalization or prolongation of existing hospitalization * resulted in persistent or significant disability/incapacity * congenital anomaly/birth defect * other medically important serious event. The investigator assessed whether each adverse event was possibly related to the study drug.

Time frame: From first dose of study drug until 1 week after last dose. The median (minimum, maximum) duration of treatment was 135.0 weeks (5, 363 weeks).

Number of Participants Who Developed Antibodies to Romiplostim

Two validated assays were used to test for antibodies to romiplostim / the thrombopoietin-mimetic peptide component of romiplostim (TMP). The first was an immunoassay to confirm the presence of antibodies. The second was a cell-based bioassay to detect neutralizing or inhibitory effects in vitro. If a sample was positive in both assays, a participant was defined as positive for neutralizing antibodies. Transient antibodies are those positive post-baseline but negative at the last time point tested. Persistent antibodies were those positive at the last time point tested.

Data from ClinicalTrials.gov

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