A Study of DS-1001b in Patients With Chemotherapy- and Radiotherapy-Naive IDH1 Mutated WHO Grade II Glioma

March 17, 2026 updated by: Daiichi Sankyo Co., Ltd.

A Phase II Study of DS-1001b in Patients With Chemotherapy- and Radiotherapy-naive IDH1 Mutated WHO Grade II Glioma

This Phase 2 study is conducted to assess the efficacy and safety of DS-1001b in patients with chemotherapy- and radiotherapy-naive IDH1 mutated WHO grade II glioma.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Active, not recruiting

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 (Estimated)

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.
25

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

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
      • Hiroshima, Japan
        • Hiroshima University Hospital
      • Kumamoto, Japan
        • Kumamoto University Hospital
      • Kyoto, Japan
        • Kyoto University Hospital
      • Osaka, Japan
        • National Hospital Organization Osaka National Hospital
      • Tokyo, Japan
        • Kyorin University Hospital
      • Tokyo, Japan
        • National Cancer Center Hospital
      • Tokyo, Japan
        • Tokyo Women's Medical University Hospital
    • Aichi-ken
      • Nagoya, Aichi-ken, Japan
        • Nagoya University Hospital
    • Kanagawa
      • Sagamihara, Kanagawa, Japan
        • Kitasato University Hospital
    • Miyagi
      • Sendai, Miyagi, Japan
        • Tohoku University Hospital
    • Saitama
      • Hidaka, Saitama, Japan
        • Saitama Medical University International Medical Center

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:

  • Has a histopathologically documented IDH1 mutated WHO grade II glioma according to the 2016 WHO classification.
  • Has confirmed IDH1 mutation at the R132 locus by testing at the central laboratory conducted during the screening period.
  • Has no prior anticancer treatment (including chemotherapy and radiotherapy) for glioma except craniotomy or biopsy.
  • Has at least 1 measurable and non-enhancing lesion.
  • Has an interval of at least 90 days from the latest surgery.
  • Has no sign of malignant transformation including the appearance of enhancing lesions and/or rapid growth of non-enhancing lesions.
  • Has an Eastern Cooperative Oncology Group (ECOG) performance status (PS) of 0 to 1.

Exclusion Criteria:

  • Has had a histopathological diagnosis of WHO grade III or IV glioma.
  • Has had a contrast enhancing lesion on brain MRI.
  • Has received a prior treatment with any mutant IDH1 inhibitor.
  • Has received other investigational products within 28 days before the start of the study drug treatment.
  • Has an active infection requiring systemic treatment.
  • Has multiple primary malignancies.
  • Has a history of clinically significant cardiac disease.
  • Is a pregnant or lactating woman.

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: N/A
  • 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: DS-1001b
Drug: DS-1001b
250 mg, twice daily, continuous oral administration

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
Time Frame
Overall response rate (ORR) assessed by Independent Efficacy Review Committee
Time Frame: Up to 24 months
Up to 24 months
Number of participants with treatment-emergent adverse events (TEAEs) during the study
Time Frame: Up to 24 months
Up to 24 months

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
Time Frame
Clinical benefit rate
Time Frame: Through the end of the study (up to approximately 6 years)
Through the end of the study (up to approximately 6 years)
Percentage change in tumor volume
Time Frame: Through the end of the study (up to approximately 6 years)
Through the end of the study (up to approximately 6 years)
Time to response
Time Frame: Through the end of the study (up to approximately 6 years)
Through the end of the study (up to approximately 6 years)
Duration of response
Time Frame: Through the end of the study (up to approximately 6 years)
Through the end of the study (up to approximately 6 years)
Time to treatment failure
Time Frame: Through the end of the study (up to approximately 6 years)
Through the end of the study (up to approximately 6 years)
Progression-free survival
Time Frame: Through the end of the study (up to approximately 6 years)
Through the end of the study (up to approximately 6 years)
Overall survival
Time Frame: Through the end of the study (up to approximately 6 years)
Through the end of the study (up to approximately 6 years)
Area under the concentration curve (AUC) for DS-1001a
Time Frame: Cycle 1 Day 1 to Cycle 13 Day 1 (each cycle is 28 days)
Cycle 1 Day 1 to Cycle 13 Day 1 (each cycle is 28 days)
Maximum plasma concentration (Cmax) for DS-1001a
Time Frame: Cycle 1 Day 1 to Cycle 13 Day 1 (each cycle is 28 days)
Cycle 1 Day 1 to Cycle 13 Day 1 (each cycle is 28 days)
Time to maximum plasma concentration (Tmax) for DS-1001a
Time Frame: Cycle 1 Day 1 to Cycle 13 Day 1 (each cycle is 28 days)
Cycle 1 Day 1 to Cycle 13 Day 1 (each cycle is 28 days)
Change from baseline in 2-hydroxyglutarate (2-HG) concentration in patient specimens after treatment with DS-1001b
Time Frame: Through the end of the study (up to approximately 6 years)
Through the end of the study (up to approximately 6 years)

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.
Daiichi Sankyo 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: Clinical Study Leader, Daiichi Sankyo

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

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 8, 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.
March 10, 2023

Study Completion (Estimated)

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.
August 31, 2026

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).
June 29, 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.
July 2, 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.
July 7, 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.
March 20, 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.
March 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.
March 1, 2026

More Information

Terms related to this study

Keywords

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.
  • DS1001-A-J201
  • 205339 (Other Identifier: JapicCTI)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

De-identified individual participant data (IPD) and applicable supporting clinical trial documents may be available upon request at https://vivli.org/. In cases where clinical trial data and supporting documents are provided pursuant to our company policies and procedures, Daiichi Sankyo will continue to protect the privacy of our clinical trial participants. Details on data sharing criteria and the procedure for requesting access can be found at this web address: https://vivli.org/ourmember/daiichi-sankyo/

IPD Sharing Time Frame

Studies for which the medicine and indication have received European Union (EU) and United States (US), and/or Japan (JP) marketing approval on or after 01 January 2014 or by the US or EU or JP Health Authorities when regulatory submissions in all regions are not planned and after the primary study results have been accepted for publication.

IPD Sharing Access Criteria

Formal request from qualified scientific and medical researchers on IPD and clinical study documents from clinical trials supporting products submitted and licensed in the United States, the European Union and/or Japan from 01 January 2014 and beyond for the purpose of conducting legitimate research. This must be consistent with the principle of safeguarding study participants' privacy and consistent with provision of informed consent.

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP
  • CSR

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.

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