A Study of Gilteritinib (ASP2215) Combined With Chemotherapy in Children, Adolescents and Young Adults With FMS-like Tyrosine Kinase 3 (FLT3)/Internal Tandem Duplication (ITD) Positive Relapsed or Refractory Acute Myeloid Leukemia (AML)

Stopped early · Phase 1/Phase 2

Conditions studied: Acute Myeloid Leukemia (AML), Acute Myeloid Leukemia With FMS-like Tyrosine Kinase 3 (FLT3) Mutation / Internal Tandem Duplication (ITD)

In brief

The purpose of the phase 1 portion (dose escalation) of the study was to establish an optimally safe and biologically active recommended phase 2 dose (RP2D) and/or to determine maximum tolerated dose (MTD) for gilteritinib in sequential combination with fludarabine, cytarabine and granulocyte colony-stimulating factor (FLAG). The purpose of the phase 2 portion (dose expansion) was to determine complete remission (CR) rates and composite complete remission (CRc) rates after two cycles of therapy. The study also assessed safety, tolerability and toxicities of gilteritinib in combination with FLAG, evaluated FLT3 inhibition, assessed pharmacokinetics (PK), performed serial measurements of minimal residual disease, obtained preliminary estimates of 1-year event free survival (EFS) and overall survival (OS) rate and assessed the acceptability as well as palatability of the formulation. One cycle was defined as 28 days of treatment. A participant completing 1 or 2 treatment cycles in phase 1 or 2 had the option to participate in long term treatment (LTT) with gilteritinib (for up to 2 years).

Key facts

Study ID: NCT04240002
Run by: Astellas Pharma Global Development, Inc.
People needed: 9
Starts: 2020-09-04
Expected to finish: 2025-03-17
Last updated by the study team: 2026-01-05

Who can join

Age: 1 and older, up to 21. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

Subject is aged ≥ 6 months and < 21 years of age* at the time of signing informed consent and/or assent, as applicable.
*For phase 2: Enrollment of subjects from 6 months to less than 1 year and 1 year to less than 2 years will be dependent on the establishment of recommended phase 2 dose (RP2D) in the respective age groups during phase 1.
Subject has a diagnosis of acute myeloid leukemia (AML) according to The French-American-British (FAB) classification with ≥ 5% blasts in the bone marrow, with or without extramedullary disease (except subjects with active central nervous system [CNS] leukemia).
In the phase 1 portion of the study, subject must be in first or greater relapse or refractory to induction therapy with no more than 1 attempt at remission induction (up to 2 induction cycles).
For the phase 2 portion of the study, subject must be in refractory to or at the first hematologic relapse after first-line remission induction AML therapy (up to 2 induction cycles).
Subject has fully recovered from the acute toxic effects of all prior chemotherapy, immunotherapy, or radiotherapy prior to entering this study.
Myelosuppressive chemotherapy:
For subject who relapses while receiving cytotoxic therapy, at least 21 days must have elapsed since the completion of cytotoxic therapy and prior to screening, unless the subject has recovered earlier than 21 days.
Cytoreduction with the following can be initiated and continued for up to 24 hours prior to the start of systemic protocol therapy (cycle 1 day -1).
hydroxyurea,
low dose cytarabine (100 mg/m\^2 per dose once daily for 5 days) or
other low dose/maintenance therapies as per local site practice.
Subject who has received other FLT3 inhibitors (e.g., lestaurtinib, sorafenib, etc) is eligible for this study.
Hematopoietic growth factors: at least 7 days must have elapsed since the completion of therapy with a growth factor and prior to screening.
Biologic (anti-neoplastic agent): at least 7 days must have elapsed since the completion of therapy with a biologic agent and prior to screening. For agents that have known adverse events (AEs) occurring beyond 7 days after administration, this period must be extended beyond the time during which AEs are known to occur.
X-ray treatment (XRT):
14 days must have elapsed for local palliative XRT for CNS chloromas and prior to screening; no washout period is necessary for other chloromas;
Prior to screening, 90 days must have elapsed if the subject had a prior traumatic brain injury or has received craniospinal XRT.
For subject undergoing hematopoietic stem cell transplant (HSCT), at least 90 days must have elapsed since HSCT and subject must not have active graft-versus-host disease (GVHD).
Subject has Karnofsky score ≥ 50 (if the subject is of ≥ 16 years of age) or Lansky score of ≥ 50 (if the subject is < 16 years of age). A score < 50 is acceptable if related to the subject's leukemia.
Subject must meet the following criteria as indicated on the clinical laboratory tests.
Serum aspartate aminotransferase (AST) and alanine aminotransferase (ALT) ≤ 3.0 x upper limit normal (ULN) for age
Total serum bilirubin ≤ 1.5 x ULN for age
Estimated glomerular filtration rate of > 60 mL/min/1.73 m\^2.
A female subject is eligible to participate if she is not pregnant and at least 1 of the following conditions applies:

You may not qualify if…

Subject has active CNS leukemia.
Subject has uncontrolled or significant cardiovascular disease, including:
Diagnosed or suspected congenital long QT syndrome or any history of clinically significant ventricular arrhythmias (such as ventricular tachycardia, ventricular fibrillation, or Torsades de Pointes (TdP)); any history of arrhythmia will be discussed with the sponsor prior to subject's entry into the study
Prolonged Fridericia's Correction Formula (QTcF) interval on pre-entry electrocardiogram (ECG) (≥ 450 ms)
Any history of second or third degree heart block (may be eligible if the subject currently has a pacemaker)
Heart rate < 50 beats/minute on pre-entry ECG
Uncontrolled hypertension
Complete left bundle branch block
Subject has systemic fungal, bacterial, viral or other infection that is exhibiting ongoing signs/symptoms related to the infection without improvement despite appropriate antibiotics or other treatment. The subject needs to be off pressors and have negative blood cultures for 48 hours.
Subject is receiving or plans to receive concomitant chemotherapy, radiation therapy, or immunotherapy other than as specified in the protocol.
Subject has active clinically significant GVHD or is on treatment with immunosuppressive drugs for treatment of active GVHD, with the exception of subjects being weaned from systemic corticosteroids where the subject is receiving ≤ 0.5 mg/kg of prednisone (or equivalent) daily dose for prior GVHD. Subject has received calcineurin inhibitors within 4 weeks prior to screening, unless used as GVHD prophylaxis.
Subject has active malignant tumors other than AML.
Subject has any significant concurrent disease, illness, psychiatric disorder or social issue that would compromise subject safety or compliance; interfere with consent, study participation, follow-up or interpretation of study results.
Subject has hypokalemia and/or hypomagnesemia at Screening (defined as values below institutional lower limit of normal [LLN]). Repletion of potassium and magnesium levels during the screening period is allowed.
Subject requires treatment with concomitant drugs that are strong inducers of cytochrome P450 (CYP)3A/P-glycoprotein (P-gp).
Subject is known to have human immunodeficiency virus infection.
Subject has active hepatitis B or C, or other active hepatic disorder.
Subjects with positive hepatitis B surface antigen (HBsAg) or detectable hepatitis B DNA are not eligible.
Subjects with negative HBsAg, positive hepatitis B core antibody and negative hepatitis B surface antibody will be eligible if hepatitis B DNA is undetectable.
Subjects with antibodies to hepatitis C virus will be eligible if hepatitis C RNA is undetectable.
Subject must wait for at least 5 half-lives after stopping therapy with any investigational agent and before starting gilteritinib.
Subject has a known or suspected hypersensitivity to gilteritinib, cytarabine, fludarabine, granulocyte colony-stimulating factor (G-CSF) or any components of the formulation used.

Where it is running

St. Jude Children's Research Hospital — Memphis, Tennessee, United States
Site DE49004 — Essen, North Rhine-Westphalia, Germany
SIte IT39001 — Roma, Italy
Site ES34001 — Barcelona, Spain
Site GB44001 — Birmingham, United Kingdom
Site GB44005 — Cardiff, United Kingdom
Site UK44007 — Sutton, United Kingdom

Full record on ClinicalTrials.gov

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