Eltrombopag vs Standard Front Line Management for Newly Diagnosed Immune Thrombocytopenia (ITP) in Children

Immune Thrombocytopenia Clinical Trial

Official title:

A Phase III Study of Eltrombopag vs Standard Front Line Management for Newly Diagnosed Immune Thrombocytopenia in Children

Clinical Trial Details — Status: Active, not recruiting

Administrative data

• NCT number: NCT03939637
• Other study ID #: H-42131 ICON 3
• Secondary ID: CETB115JUS33TICO
• Status: Active, not recruiting
• Phase: Phase 3
• Start date: May 2, 2019
• Est. completion date: December 31, 2025

Study information

• Verified date: March 2024
• Source: Baylor College of Medicine
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

This is an investigator initiated, multicenter, open label, randomized phase 3 study for subjects with newly diagnosed ITP from ages 1 to less than 18 years old.

Description:

This is a prospective, open label, randomized, two-arm, multi-center Phase 3 trial. Patients with newly diagnosed ITP are randomized 2:1 to receive the experimental treatment, eltrombopag, or investigator's choice of 3 standard therapies. The primary objective is to determine if the proportion of patients with platelet response is significantly greater in patients treated with eltrombopag compared to those treated with standard therapies.

Recruitment information / eligibility

• Status: Active, not recruiting
• Enrollment: 122
• Est. completion date: December 31, 2025
• Est. primary completion date: March 31, 2025
• Accepts healthy volunteers: No
• Gender: All
• Age group: 1 Year to 18 Years

Eligibility

Inclusion Criteria:

• Age: 1- <18 years
• Newly diagnosed ITP (<3 months from diagnosis (first abnormal platelet count), per international working group definition17)
• Platelets <30 x 10^9/L at screening
• Requires pharmacologic treatment from the perspective of the treating clinician. Need to treat is at the discretion of the investigator, but there should be clinical equipoise about the use of eltrombopag vs standard treatment options (patients should not, in the opinion of the investigator, require concomitant therapy at time of enrollment).
• Treatment options include one of three standard therapies, (IVIg, steroids, or Anti-D). For example, if patient has previously shown no response to IVIg or steroids and is Rh-negative, patient would not be eligible for study.
• Patient population includes both:

1. Upfront treatment: Patient within 10 days of ITP diagnosis who has not received previous treatment OR

2. Treatment failure: Patients who have failed standard management (observation or treatment with one or more first-line agents)

• Failure of observation: no platelet recovery (>30 x 10^9/L) with observation >10 days from diagnosis, with need to treat
• Poor response to first-line agent (platelets remain <30 x10^9/L)
• Initial response to first-line agent, but response wanes and platelets fall below 30 x10^9/L
• Family willing and able to return for required lab studies

Exclusion Criteria:

• Severe bleeding: Buchanan Overall Grade 4 or 5 bleeding, or severe bleeding requiring emergent treatment at the discretion of the provider. (e.g., intracranial hemorrhage, pulmonary hemorrhage, bleeding with ongoing need for pRBC transfusion)
• Prior treatment with TPO-RA (eltrombopag or romiplostim)
• Known secondary ITP (due to lupus, CVID, ALPS)
• Known HIV (or history of HIV positivity) or Hepatitis C (screening not required if no clinical suspicion)
• Evans Syndrome: positive direct Coombs with evidence of active hemolysis (elevated lactate dehydrogenase (LDH) or reticulocyte count not attributable to recent treatment or bleeding)
• Any Malignancy
• History of stem cell transplant or solid organ transplant
• aspartate aminotransferase (AST) or ALT >2 x upper limit of normal (ULN)
• Total bilirubin >1.5 × ULN
• Subjects with liver cirrhosis (as determined by the investigator)
• Creatinine >2.5 × ULN
• Known active or uncontrolled infections not responding to appropriate therapy
• On anticoagulation or anti-platelet agents
• Known thrombophilic risk factors. Exception: Subjects for whom the potential benefits of participating in the study outweigh the potential risks of thromboembolic events, as determined by the investigator.
• Baseline ophthalmic problems that may potentiate cataract development
• Impaired cardiac function, such as:
• Known prolonged QTc, with corrected QTc >450 msec
• Other clinically significant cardio-vascular disease (e.g., uncontrolled hypertension, history of labile hypertension),
• History of known structural abnormalities (e.g. cardiomyopathy).
• History or current diagnosis of cardiac disease indicating significant risk of safety for patients participating in the study such as uncontrolled or significant cardiac

disease, including any of the following:

• Recent myocardial infarction (within last 6 months),
• Uncontrolled congestive heart failure,
• Unstable angina (within last 6 months),
• Clinically significant (symptomatic) cardiac arrhythmias (e.g., sustained ventricular tachycardia, and clinically significant second or third degree AV block without a pacemaker.)
• Long QT syndrome, family history of idiopathic sudden death, congenital long QT syndrome or additional risk factors for cardiac repolarization abnormality, as determined by the investigator.
• Known immediate or delayed hypersensitivity reaction to eltrombopag or its excipient.
• Pregnant, breastfeeding, or unwilling to practice birth control during participation in the study. Women of childbearing potential (have achieved menarche) must have a negative serum or urine pregnancy test and agree to use basic methods of contraception (if sexually active) or maintain abstinence for the duration of the study. Basic

contraception methods include:

• Total abstinence (when this is in line with the preferred and usual lifestyle of the subject. Periodic abstinence (e.g., calendar, ovulation, symptothermal, post-ovulation methods) and withdrawal are not acceptable methods of contraception
• Female sterilization (have had surgical bilateral oophorectomy with or without hysterectomy), total hysterectomy, or tubal ligation at least six weeks before taking study treatment. In case of oophorectomy alone, only when the reproductive status of the woman has been confirmed by follow up hormone level assessment
• Male sterilization (at least 6 months prior to screening). The vasectomized male partner should be the sole partner for that subject
• Barrier methods of contraception: Condom or Occlusive cap. For the UK: with spermicidal foam/gel/film/cream/ vaginal suppository
• Use of oral, injected or implanted hormonal methods of contraception or placement of an intrauterine device (IUD) or intrauterine system (IUS), or other forms of hormonal contraception that have comparable efficacy (failure rate <1%), for example hormone vaginal ring or transdermal hormone contraception. In case of use of oral contraception women should have been stable on the same pill for a minimum of 3 months before taking study treatment.
• Male patients who are sexually active and do not agree to abstinence or to use a condom during intercourse while taking eltrombopag, and for 7 days after stopping treatment.
• History of alcohol/drug abuse
• Presence of a medical condition that in the opinion of the Investigator would compromise the safety of the patient or the quality of the data.
• Concurrent participation in an investigational study within 30 days prior to enrollment or within 5-half-lives of the investigational product, whichever is longer. Note: parallel enrollment in a non-therapeutic trial such as disease registry or biology study is permitted. Other Eligibility Criteria Considerations All patients and/or their parents or legal guardians must sign a written informed consent (and assent when applicable)
• Patients and/or parents who are unable to read English at a grade 2 level will be excluded from the patient-reported outcome component of the study. They will not be excluded from all other aspects of the study

Related Conditions & MeSH terms

• Immune Thrombocytopenia
• Purpura, Thrombocytopenic, Idiopathic
• Thrombocytopenia

Intervention

Drug:
• Eltrombopag
Starting dose for eltrombopag will be based on manufacturer recommendations, and drug will be titrated to effect per guidelines. Children 1 to 5 years: Initial: 25 mg once daily Children =6 years and Adolescents: Initial: 50 mg once daily (25 mg once daily for patients of East-Asian ethnicity [e.g., Chinese, Japanese, Korean, Taiwanese]) Dose should be titrated based on platelet response. Maximum dose: 75 mg once daily.
• Steroids
Prednisone/Prednisolone 4mg/kg/day (Max 120 mg/day) x 4 day
• IVIG
IVIG 1 g/kg x1 (no steroids for pre-medication or adjunctive therapy)
• Rho(D) Immune Globulin
Anti-D globulin 75 mcg/kg x1 (no steroids for pre-medication or adjunctive therapy)

Locations

Country	Name	City	State
United States	Alfac Cancer and Blood Disorder Center: Scottish Rite	Atlanta	Georgia
United States	Children's Hospital Colorado	Aurora	Colorado
United States	Children's of Alabama	Birmingham	Alabama
United States	Boston Children's Hospital	Boston	Massachusetts
United States	Levine Cancer Institute	Charlotte	North Carolina
United States	Ann & Robert H. Lurie Children's Hospital of Chicago	Chicago	Illinois
United States	Nationwide Children's Hospital	Columbus	Ohio
United States	Duke University Medical Center	Durham	North Carolina
United States	University of Florida College of Medicine	Gainesville	Florida
United States	Hackensack University Medical Center	Hackensack	New Jersey
United States	Texas Children's Hospital	Houston	Texas
United States	Riley Hospital for Children-Indiana University	Indianapolis	Indiana
United States	Arkansas Children's Hospital	Little Rock	Arkansas
United States	University of Wisconsin	Madison	Wisconsin
United States	St. Jude Children's Hospital	Memphis	Tennessee
United States	Children's Hospital and Clinics of Minnesota	Minneapolis	Minnesota
United States	Columbia University Irving Medical Center	New York	New York
United States	Weill Cornell Medical College	New York	New York
United States	University of Nebraska Medical Center	Omaha	Nebraska
United States	The Children's Hospital of Philadelphia	Philadelphia	Pennsylvania
United States	Phoenix CHildren's Hospital	Phoenix	Arizona
United States	Oregon Health and Science University	Portland	Oregon
United States	Randall Children's Hospital	Portland	Oregon
United States	Hasbro Children's Hospital	Providence	Rhode Island
United States	UCSF Benioff Children's Hospital	San Francisco	California
United States	Children's National Medical Center	Washington	District of Columbia

Sponsors (3)

Lead Sponsor	Collaborator
Baylor College of Medicine	Boston Children's Hospital, University of California, San Francisco

Country where clinical trial is conducted

United States, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Other	Time to response	Time to response (platelets >30x10^9/L, and at least 2-fold increase in the baseline count and absence of bleeding) (IWG definition)	1 year
Other	Platelet-specific endpoints	Treatment response (platelets >30x10^9/L, and at least 2-fold increase in the baseline count and absence of bleeding) (IWG definition) at 12 weeks	1 year
Other	Time to platelet count	Time to platelet count >100x10^9/L and absence of bleeding (IWG definition)	1 year
Other	Treatment response	Treatment response (platelet count >100x10^9/L and absence of bleeding) (IWG definition) at 12 weeks	1 year
Other	Loss of treatment response	Loss of treatment response (platelet count below 30x10^9/L, or less than 2-fold increase in the baseline count or bleeding) (IWG definition) at any time during the study period after achieving response during the first 12 weeks	1 year
Other	Extreme thrombocytosis	Extreme thrombocytosis (platelets >1 x10^12/L)	1 year
Other	Patient-reported outcomes endpoints	Change in child self-reported and parent impact KIT scores from baseline at 1 week, 4 weeks, 12 weeks, and 1 year after study enrollment	1 year
Other	Change in Hockenberry fatigue	Change in Hockenberry fatigue (FS-C, FS-A, FS-P) scores from baseline at 1 week, 4 weeks, 12 weeks, and 1 year after study enrollment	1 year
Other	Global Change Scale scores	Global Change Scale scores at 1 week, 4 weeks, 12 weeks, and 1 year after study enrollment	1 year
Other	Number of Hospitalizations	Number of hospitalizations	1 year
Primary	Proportion of patients with a platelet response	To determine if the proportion of patients with a platelet response is significantly greater in patients with newly diagnosed ITP treated with eltrombopag than those treated with standard first-line treatments	12 weeks
Secondary	Bleeding Score	Poor bleeding score (binary) at 1, 2, 3, 4 weeks, 12 weeks, and 1 year after study enrollment defined as World Health Organization (WHO) Bleeding Scale = 2 or Modified Buchanan Scale = 3	1 year
Secondary	Number of rescue therapies	Cumulative number of rescue therapies required during the first 12 weeks of treatment	12 weeks
Secondary	Platelet response	5.2.3 Platelet response (binary), defined as = 3 of 4 weeks with platelets >50 x109/L during weeks 6-12 of therapy, but patient required a rescue treatment during weeks 1-2 of study.	12 weeks
Secondary	Need for treatment	No further need for treatment (binary) after 12 weeks or 6 months of study	6 months
Secondary	Treatment response	Treatment response (binary endpoints) at 1 year defined as: CR is defined as platelet count >/= 150 x 10^9/L; Primary Remission at 1 year is defined as CR at 1 year with no second-line agents required and >/= 3 months after discontinuing most recent platelet active medication; Disease resolution at 1 year is defined as complete response (CR) at 1 year >/= 3 months after discontinuing most recent platelet active medication. May have received a second-line therapy, excluding rituximab or splenectomy.; Disease stability at 1 year is defined as platelets >/= 50 x 10^9/L but <150 x 10^9/L >/= 3 months after discontinuing most recent platelet active medication.	1 year
Secondary	Number of 2nd line therapies	Number of 2nd-line therapies in weeks 13-52	52 weeks
Secondary	Regulatory T-Cells	Absolute change in percentage of CD4+25+Foxp3+ regulatory T cells from baseline at 12 weeks and 1 year	1 year
Secondary	KIT Scores	Change in parent proxy-reported Kids ITP tool (KIT) overall scores from baseline at 1 week, 4 weeks, 12 weeks, and 1 year after study enrollment	1 year
Secondary	Hockenberry Fatigue Scale-Parent	Total scale intensity ratings (continuous) from the Hockenberry Fatigue Scale-Parent (FS-P) at 1 week, 4 weeks, 12 weeks, and 1 year	1 year
Secondary	Blood Iron values	Serum iron, total iron binding capacity (TIBC), transferrin saturation, ferritin, mean corpuscular volume (MCV), and hemoglobin at 12 weeks, 6 months, and 1 year after study enrollment	1 year
Secondary	Safety evaluations	Safety evaluations as defined by: Abnormal liver function tests (LFTs): ALT = 3 x upper limit of normal (ULN) in patients with normal baseline ALT = 3 x baseline or = 5 x ULN (whichever is lower) in patients with abnormal baseline ALT = 3 x ULN AND bilirubin = 1.5 x ULN (>35% direct); Incidence of adverse events; Incidence of serious adverse events	1 year