A Study of Enasidenib in People With Clonal Cytopenia of Undetermined Significance

NCT ID: NCT05102370

Last Updated: 2026-01-27

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: PHASE1
• Total Enrollment: 4 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2021-10-06
• Study Completion Date: 2026-01-26

Brief Summary

Study researchers think that a drug called enasidenib may help people with clonal cytopenia of undetermined significance (CCUS) because the drug blocks the mutated IDH2 protein, which may improve blood cell counts. The purpose of this study is to find out whether enasidenib is a safe and effective treatment for CCUS.

Conditions

Clonal Cytopenia of Undetermined Significance; CCUS Clonal Cytopenia of Undetermined Significance

Study Design

• Allocation Method: NA
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: TREATMENT
• Blinding Strategy: NONE

Study Groups

Participants with CCUS with mutations in IDH2

Participants will have CCUS with mutations in IDH2

Group Type: EXPERIMENTAL

Enasidenib

Intervention Type: DRUG

Study participants will receive enasidenib 100 mg daily for 18 months. Participants will continue treatment with enasidenib until confirmed progression to AML or MDS, development of unacceptable toxicity, or suspicion of disease progression, provided the patient is deriving clinical benefit, which will be determined at the discretion of the principal investigator.

Interventions

Enasidenib

Study participants will receive enasidenib 100 mg daily for 18 months. Participants will continue treatment with enasidenib until confirmed progression to AML or MDS, development of unacceptable toxicity, or suspicion of disease progression, provided the patient is deriving clinical benefit, which will be determined at the discretion of the principal investigator.

Intervention Type: DRUG

Eligibility Criteria

Inclusion Criteria

• Age ≥18 years at the time of signing the informed consent form.
• Willing and able to adhere to the study visit schedule and other protocol requirements.
• 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
• Results of bone marrow biopsy within 1 month of study entry (screening bone marrow biopsy) must not indicate hematologic disease.
• IDH2 gene mutation (R140 or R172), performed locally, at a frequency >2%.
• ECOG performance status of 0-2.
• Adequate organ function, defined as:

• Serum aspartate aminotransferase/serum glutamic oxaloacetic transaminase (AST/SGOT) and alanine aminotransferase (ALT/SGPT) ≤3x upper limit of normal (ULN), unless the subject has Gilbert's syndrome.
• Serum total bilirubin <1.5x ULN. Higher levels are acceptable if these can be attributed to ineffective erythropoiesis. In these cases, approval from the study Principal Investigator is required.
• Creatinine clearance greater than 50 mL/min based on the Cockroft-Gault glomerular filtration rate estimation.
• Patients being enrolled on study on the basis of anemia, will only be eligible if folate, B12, serum iron, serum ferritin, total iron binding capacity, haptoglobin and peripheral smear within normal limits
• Women of childbearing potential may participate provided they have a negative serum pregnancy test at screening and a negative serum or urine pregnancy test within 72 h of starting treatment.
• Women of childbearing potential (WOCBP) and males with partners who are WOCBP must agree to abstain from sexual intercourse or to use 1 highly effective form of contraception during the study and for at least 4 months following the last dose of enasidenib. Males with partners who are WOCBP must agree to use a barrier method.

Exclusion Criteria

• Active malignancy defined as >1-cm disease on most recent CT scan in the past 6 months or recent history of cancer (i.e. within the past 5 years) with >50% chance of cancer recurrence in the next 5 years.
• Current or prior history of hematologic malignancy.
• Therapy (including maintenance therapy) for solid-tumor malignancy within the last 6 months.
• Known dysphagia, short-gut syndrome, gastroparesis, or other conditions that limit the ingestion or gastrointestinal absorption of drugs administered orally.
• Active uncontrolled systemic fungal, bacterial, or viral infection (defined as ongoing signs/symptoms related to the infection without improvement despite appropriate antibiotics, antiviral therapy, and/or other treatment).
• Positive direct Coombs test
• Evidence of hypersplenism on physical exam
• Pregnant or lactating (women).

• Minimum Eligible Age: 18 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Memorial Sloan Kettering Cancer Center

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Eytan Stein, MD

Role: PRINCIPAL_INVESTIGATOR

Memorial Sloan Kettering Cancer Center

Locations

Mayo Clinic (Data Collection Only)

Rochester, Minnesota, United States

Washington University (Data Collection and Specimen Analysis)

St Louis, Missouri, United States

Memorial Sloan Kettering at Basking Ridge (All Protocol Activities)

Basking Ridge, New Jersey, United States

Memorial Sloan Kettering Monmouth (All protocol activities)

Middletown, New Jersey, United States

Memorial Sloan Kettering Bergen (Limited protocol activities)

Montvale, New Jersey, United States

Memorial Sloan Kettering Suffolk-Commack (Limited protocol activities)

Commack, New York, United States

Memorial Sloan Kettering Westchester (All Protocol Activities)

Harrison, New York, United States

Memorial Sloan Kettering Cancer Center (All Protocol Activities)

New York, New York, United States

Memorial Sloan Kettering Nassau (Limited protocol activities)

Rockville Centre, New York, United States

Cleveland Clinic (Data Collection Only)

Cleveland, Ohio, United States

Ohio State University (Data Collection Only)

Columbus, Ohio, United States

Oregon Health & Science University (Data Collection Only)

Portland, Oregon, United States

Countries

United States

Related Links

http://www.mskcc.org

Memorial Sloan Kettering Cancer Center

Other Identifiers

21-268

Identifier Type: -

Identifier Source: org_study_id