Ivosidenib for Patients With Clonal Cytopenia of Undetermined Significance and Mutations in IDH1

A Pilot Study of Ivosidenib for Patients With Clonal Cytopenia of Undetermined Significance and Mutations in IDH1

This is an open-label, multicenter study exploring the efficacy of ivosidenib in patients with clonal cytopenia of undetermined significance (CCUS) with mutations in IDH1. The purpose is to establish proof of principle that ivosidenib is well-tolerated and potentially efficacious in improving blood count abnormalities in these patients.

The study will also be offered in a decentralized, remote structure to patients.

Study Overview

• Status: Active, not recruiting
• Conditions: Clonal Cytopenia of Undetermined Significance
• Intervention / Treatment: Drug: Ivosidenib

• Study Type: Interventional
• Enrollment (Actual): 20
• Phase: Phase 2

Contacts and Locations

Study Locations

• United States
  • Missouri
    • Saint Louis, Missouri, United States, 63110
      • Washington University School of Medicine
  • Ohio
    • Cleveland, Ohio, United States, 44195
      • Cleveland Clinic - Case Comprehensive Cancer Center

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Unexplained cytopenia for at least 6 months. Cytopenia is defined as the presence of ≥1 blood count indexes below the following thresholds:

  • Hgb <10 g/dL
  • ANC <1.8 × 10^9/L
  • Platelets <100 × 10^9/L
• IDH1 gene mutation (R132) confirmed by droplet digital PCR (ddPCR) testing, at a frequency > 2%. This will be performed locally and confirmed at Washington University.
• At least 18 years of age.
• ECOG performance status 0-2

• Adequate organ function as defined below:

  • AST(SGOT)/ALT(SGPT) ≤ 3.0 x IULN
  • Serum total bilirubin < 1.5 x IULN (an upper limit of bilirubin 5mg/dL is acceptable if it can be attributed to Gilbert's syndrome or erythropoiesis)
  • Serum creatinine < 2 x IULN or creatinine clearance > 50 mL/min by Cockcroft-Gault glomerular filtration rate estimation
• The effects of ivosidenib on the developing human fetus are unknown. For this reason, women of childbearing potential and men must agree to use adequate contraception (defined in Section 5.5) prior to study entry, for the duration of study participation, and for 90 days after the last dose of ivosidenib. Should a woman become pregnant or suspect she is pregnant while participating in this study, she must inform her treating physician immediately. Men treated or enrolled on this protocol must also agree to use adequate contraception prior to the study, for the duration of the study, and for 90 days after the last dose of ivosidenib.
• Ability to understand and willingness to sign an IRB approved written informed consent document (or that of legally authorized representative, if applicable).

Exclusion Criteria:

• Indication of hematologic disease by bone marrow biopsy within 6 months of study entry.

  *Evidence of disease progression from time of bone marrow biopsy to enrollment based on investigator review of symptoms and complete blood counts

• Active malignancy (defined as > 1 cm disease on most recent CT scan in the past 6 months).
• Currently receiving therapy for solid tumor malignancy.
• Currently receiving any other investigational agents.
• Known dysphagia, short-gut syndrome, gastroparesis, or other conditions that limit the ingestion or gastrointestinal absorption of drugs administered orally.
• A history of allergic reactions attributed to compounds of similar chemical or biologic composition to ivosidenib or other agents used in the study.
• Uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, or cardiac arrhythmia.
• Pregnant and/or breastfeeding. Women of childbearing potential must have a negative pregnancy test within 72 hours of study entry.
• Heartrate corrected QT interval (QTc) > 450 msec or with other factors that increase the risk of QT prolongation or arrhythmic events (e.g. heart failure, hypokalemia, family history of long QT interval syndrome).
• Known medical history of progressive multifocal leukoencephalopathy (PML).
• Currently taking medications known to be CYP3A4 strong inducers and sensitive substrates.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Ivosidenib; -Ivosidenib is an oral drug which will be administered on an outpatient basis at a dose of 500 mg daily for up to 5 years. Each cycle is 28 days.	Drug: Ivosidenib; . Patients should take ivosidenib at approximately the same time every day, with or without food, but should be instructed to avoid a high-fat meal as well as grapefruit and grapefruit products.; Other Names: TIBSOVO

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Rate of improvement in hematologic parameters	Will be evaluated according to a modified version of the IWG 2006 Criteria for Hematologic Improvement for patients with MDS on clinical trials; Erythroid response (pretreatment, <11 g/DL)Hemoglobin (Hgb) increase by ≥1.5 g/dLRelevant reduction of units of RBC transfusions by an absolute number of at least 4 RBC transfusions/8 weeks, compared with the pretreatment transfusion number in the previous 8 weeks. Only RBC transfusions given for an Hgb of ≤9.0 g/dL pretreatment will count in the RBC transfusion response evaluation; Platelet response (pretreatment, <100 x 10^9/L)Absolute increase of ≥30 × 10^9/L for patients starting with >20 × 10^9/L platelets.Increase from <20 × 10^9/L to >20 × 10^9/L and by at least 100%.; Neutrophil response (pretreatment, <1.0 x 10^9/L):At least 100% increase and an absolute increase >0.5 × 10^9/L. If pegfilgrastim being used prior to initiation of study, define response as no longer requiring pegfilgrastim to maintain ANC >500.	Through 30 days after completion of treatment (estimated to be 61 months)

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Change in mutant IDH1 variant allele fraction	-ddPCR is a highly sensitive and accurate method for quantifying VAF. This will be performed centrally at the Washington University clinical pathology laboratory using standard procedures. To account for assay variation, the investigators will perform 10 runs using the ddPCR assay and take the mean VAF as the final measurement.	Through completion of treatment (estimated to be 60 months)
Disease free survival	-Events include development of MDS/AML or death.	Through 30 days after completion of treatment (estimated to be 61 months)
Number of adverse events as measured by CTCAE v 5.0		Through 30 days after completion of treatment (estimated to be 61 months)
Duration of hematologic response		Through completion of treatment (estimated to be 60 months)

Collaborators and Investigators

• Sponsor: Washington University School of Medicine
• Collaborators: Gateway for Cancer Research; Servier Hellas Pharmaceuticals Ltd.
• Investigators: Principal Investigator: Kelly Bolton, M.D., Ph.D., Washington University School of Medicine

Publications and helpful links

Helpful Links

• Alvin J. Siteman Cancer Center at Barnes-Jewish Hospital and Washington University School of Medicine
• Preventing IDH Mutant Myeloid Neoplasm (PIMM) Clinical Trial Information

Study record dates

Study Major Dates

• Study Start (Actual): April 1, 2022
• Primary Completion (Estimated): January 31, 2030
• Study Completion (Estimated): January 31, 2030

Study Registration Dates

• First Submitted: August 24, 2021
• First Submitted That Met QC Criteria: August 31, 2021
• First Posted (Actual): September 1, 2021

Study Record Updates

• Last Update Posted (Actual): August 14, 2025
• Last Update Submitted That Met QC Criteria: August 8, 2025
• Last Verified: August 1, 2025

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Leukocyte Disorders; Hematologic Diseases; Blood Platelet Disorders; Cytopenia; Thrombocytopenia; Anemia; Leukopenia; Antineoplastic Agents; Molecular Mechanisms of Pharmacological Action; Enzyme Inhibitors; Ivosidenib
• Other Study ID Numbers: 202110038

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: YES
• IPD Plan Description: Individual participate data that underlie the results reported in this article after deidentification (including text, tables, figures and appendices) will be available.
• IPD Sharing Time Frame: The data will be available immediately following publication with no end date.
• IPD Sharing Access Criteria: The data will be available immediately following publication with no end date. Access will be provided to anyone and for any purpose.
• IPD Sharing Supporting Information Type: STUDY_PROTOCOL; SAP; ANALYTIC_CODE

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No