A Phase I/II Study of ASTX660 in Patients With Relapsed or Refractory T-cell Lymphoma

February 17, 2026 updated by: Otsuka Pharmaceutical Co., Ltd.

A Phase I/II, Multicenter, Open-Label, Nonrandomized Study to Evaluate the Tolerability and Safety of ASTX660 and the Efficacy at the Recommended Dose of ASTX660 in Patients With Relapsed or Refractory T-Cell Lymphoma

Phase 1 (dose-escalation part): Investigate the tolerability and safety of ASTX660 in patients with r/r PTCL and r/r CTCL and determine the recommended dose (RD) for the Phase 2.

Phase 1 (ATLL expansion part): Evaluate the safety of ASTX660 at RD in patients with r/r ATLL.

Phase 2 : Evaluate the efficacy of ASTX660 at RD in patients with r/r PTCL.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Terminated

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
8

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 2
  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Japan
      • Yamagata, Japan
        • Yamagata University Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

20 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Patients with T-cell lymphoma with histological diagnosis based on WHO classification (2017)
  2. Patients with evaluable lesions.
  3. Patients with ECOG PS score of 0 or 1.

  4. Patients with adequate organ functions as shown below.

    • AST and ALT ≤ 2.0 × ULN (≤ 3.0 × ULN if liver infiltration is present)
    • Total bilirubin ≤ 1.5 × ULN
    • ANC ≥ 1,000/mm3 (≥ 750/mm3 if bone marrow infiltration is present)
    • Platelet count 50,000/mm3 (25,000/mm3 if bone marrow infiltration is present)
    • Serum creatinine ≤ 1.5 × ULN or creatinine clearance ≥ 50 mL/min
    • Amylase and lipase ≤ 1.0 × ULN

Exclusion Criteria:

  1. Patients with active infection requiring treatment with antibiotics, antifungals, or antivirals

  2. Patients with heart disease that meets the followings:

    1. LVEF of < 50% by echocardiography or MUGA scan
    2. Congestive heart failure (NYHA classification III or IV)
    3. Uncontrolled heart disease including unstable angina pectoris or hypertension considered to require hospitalization within last 3 months (90 days)
    4. Complete left bundle branch block, III degree (complete) atrioventricular block, use of pacemaker, history or complication of poorly controlled arrhythmia requiring treatment
    5. History or complication of long QT syndrome
    6. History or complication of ventricular arrhythmia requiring active treatment
    7. Corrected QT interval of ≥ 470 msec based on 12-lead ECG performed at the screening
    8. Concern on increased cardiac risk by participating in the study based on medical judgment

  3. Patients receiving the following treatment for the primary disease prior to the initial dose of study drug

    1. Chemotherapy or radiotherapy within last 3 weeks
    2. Skin directed therapy including local treatment or phototherapy within last 3 weeks
    3. Treatment with monoclonal antibody within last 4 weeks
    4. Treatment with other study drugs or study treatment within last 3 weeks or 5 half-lives, whichever is longer
  4. Patients with prior allogeneic stem cell transplantation, or autologous stem cell transplantation within 14 weeks prior to the day of initial dose of study drug
  5. Patients who have received corticosteroids at a dose exceeding a prednisone equivalent dose of 10 mg/day within 3 weeks prior to the initial dose of study drug.
  6. Patients with Inadequately controlled diabetes mellitus

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Phase 1 dose-escalation part
Subjects with r/r PTCL and r/r CTCL will receive ASTX660 once a day for 7 consecutive days every other week of each 28-day cycle (ie, [7 days on/ 7 days off] ×2; daily dosing on Days 1-7 and 15-21). The starting dose will be escalated stepwise in successive cohorts of 3 to 6 evaluable subjects each (standard 3+3 study design), until the RD is determined.
Drug: ASTX660
Treatment of ASTX660 for r/r PTCL and r/r CTCL
Drug: ASTX660
Treatment of ASTX660 for r/r ATLL
Drug: ASTX660
Treatment of ASTX660 for r/r PTCL
Experimental: Phase 1 ATLL expansion part
Subjects with r/r ATLL will receive ASTX660 at RD obtained from the Phase 1 part (dose-escalation part) once a day for 7 consecutive days every other week of each 28-day cycle.
Drug: ASTX660
Treatment of ASTX660 for r/r PTCL and r/r CTCL
Drug: ASTX660
Treatment of ASTX660 for r/r ATLL
Drug: ASTX660
Treatment of ASTX660 for r/r PTCL
Experimental: Phase 2
Subjects with r/r PTCL will receive ASTX660 at RD obtained from the Phase 1 part (dose-escalation part) once a day for 7 consecutive days every other week of each 28-day cycle.
Drug: ASTX660
Treatment of ASTX660 for r/r PTCL and r/r CTCL
Drug: ASTX660
Treatment of ASTX660 for r/r ATLL
Drug: ASTX660
Treatment of ASTX660 for r/r PTCL

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Safety (Phase 1 Dose-escalation Part) - Number of Subjects With Dose-limiting Toxicities (DLTs), AEs, Abnormal Clinical Laboratory Values or Physical Exam Results
Time Frame: 28 days (Day1 to Day29)

Dose-limiting toxicities were defined as AEs occurring during this period that meet any of the following criteria, were not related to the primary disease, complication(s), or concomitant medication(s), and has a reasonable relationship with ASTX660. The Common Terminology Criteria for Adverse Events Version 4.03 (CTCAE v4.03) was used to determine severity.

  1. Grade 4 thrombocytopenia, Grade 3 or higher clinically significant bleeding, or anemia requiring a new erythrocyte transfusion
  2. Febrile neutropenia that does not resolve within 3 days or Grade 4 neutropenia that lasts for more than 7 days under appropriate treatment
  3. Liver-associated abnormalities
  4. Excepting the above AEs, any other Grade 3 or higher nonhematologic or Grade 4 hematologic toxicity except Grade 3 nausea, vomiting, or diarrhea lasting less than 48 hours
28 days (Day1 to Day29)

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Pharmacokinetic Outcome of Concentration-time Curve (AUC)
Time Frame: Day1: pre-dose, 0.5, 1, 2, 3, 5, 6, 8, 24hours post-dose, Day7: pre-dose, 0.5, 1, 2, 3, 5, 6, 8, 24, 48, 72 hours post-dose
Assessment of pharmacokinetic parameter area under the concentration-time curve (AUC).
Day1: pre-dose, 0.5, 1, 2, 3, 5, 6, 8, 24hours post-dose, Day7: pre-dose, 0.5, 1, 2, 3, 5, 6, 8, 24, 48, 72 hours post-dose
Pharmacokinetic Outcome of Maximum Concentration (Cmax)
Time Frame: Day1: pre-dose, 0.5, 1, 2, 3, 5, 6, 8, 24hours post-dose, Day7: pre-dose, 0.5, 1, 2, 3, 5, 6, 8, 24, 48, 72 hours post-dose
Assessment of pharmacokinetic parameter maximum concentration (Cmax).
Day1: pre-dose, 0.5, 1, 2, 3, 5, 6, 8, 24hours post-dose, Day7: pre-dose, 0.5, 1, 2, 3, 5, 6, 8, 24, 48, 72 hours post-dose
Pharmacokinetic Outcome of Time to Maximum Concentration (Tmax)
Time Frame: Day1: pre-dose, 0.5, 1, 2, 3, 5, 6, 8, 24hours post-dose, Day7: pre-dose, 0.5, 1, 2, 3, 5, 6, 8, 24, 48, 72 hours post-dose
Assessment of pharmacokinetic parameter time to maximum concentration (Tmax).
Day1: pre-dose, 0.5, 1, 2, 3, 5, 6, 8, 24hours post-dose, Day7: pre-dose, 0.5, 1, 2, 3, 5, 6, 8, 24, 48, 72 hours post-dose
Pharmacokinetic Outcome of Elimination Half Life (t½)
Time Frame: Day1: pre-dose, 0.5, 1, 2, 3, 5, 6, 8, 24hours post-dose, Day7: pre-dose, 0.5, 1, 2, 3, 5, 6, 8, 24, 48, 72 hours post-dose
Assessment of pharmacokinetic parameter elimination half life (t½).
Day1: pre-dose, 0.5, 1, 2, 3, 5, 6, 8, 24hours post-dose, Day7: pre-dose, 0.5, 1, 2, 3, 5, 6, 8, 24, 48, 72 hours post-dose
Pharmacokinetic Outcome of Clearance of Drug From Plasma
Time Frame: Day1: pre-dose, 0.5, 1, 2, 3, 5, 6, 8, 24hours post-dose, Day7: pre-dose, 0.5, 1, 2, 3, 5, 6, 8, 24, 48, 72 hours post-dose
Assessment of pharmacokinetic parameter clearance of drug from plasma.
Day1: pre-dose, 0.5, 1, 2, 3, 5, 6, 8, 24hours post-dose, Day7: pre-dose, 0.5, 1, 2, 3, 5, 6, 8, 24, 48, 72 hours post-dose

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Otsuka Pharmaceutical Co., Ltd.

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Director: Nobuhito Sanada, Otsuka Pharmaceutical Co., Ltd.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
July 14, 2020

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
November 30, 2024

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
November 30, 2024

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
April 17, 2020

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
April 23, 2020

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
April 24, 2020

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
February 25, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
February 17, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
February 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 401-102-00001
  • JapicCTI-205258 (Other Grant/Funding Number: Japic)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

The focus of this study is a rare disease.

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

Clinical Trials on Relapsed or Refractory Peripheral T-cell Lymphoma(PTCL),Cutaneous T-cell Lymphoma(CTCL),Adult T-cell Leukemia/Lymphoma(ATLL)

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Sponsors and Collaborators

Medical Conditions

Drug Interventions

Conditions

Rare Diseases

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