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Tulmimetostat DL1

Phase 1

Progressive Metastatic Castrate Resistant Prostate Cancer | Small molecule | Oncology |Novartis AG|Last Updated: Aug 21, 2026

Target and mechanism

Target class-Stat (Enzyme)
ModalitySmall molecule

Also known as Tulmimetostat DL1 QD

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLED
Total Trials1
Total Enrollment188

FDA Designations

No designations recorded

Clinical trial landscape

Tulmimetostat DL1 · 1 trial · 1 indication

Phase 1 1
NCT07206056An Open-label Dose Escalation and Expansion, Followed by a Phase II Study of Tulmimetostat (DZR123) and JSB462 (Luxdegalutamide) in Patients With Progressive Metastatic Castrate Resistant Prostate Cancer (mCRPC) (TulmiSTAR-01)Progressive Metastatic Castrate Resistant Prostate Cancer
RECRUITING188 Analytics
PHASE1RECRUITING
An Open-label Dose Escalation and Expansion, Followed by a Phase II Study of Tulmimetostat (DZR123) and JSB462 (Luxdegalutamide) in Patients With Progressive Metastatic Castrate Resistant Prostate Cancer (mCRPC) (TulmiSTAR-01)
Progressive Metastatic Castrate Resistant Prostate CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Part 1a: Dose-limiting toxicities (DLTs)
Up to 28 days

A dose-limiting toxicity (DLT) is defined as an adverse event or abnormal laboratory value assessed as unrelated to disease, disease progression, inter-current illness/injury, or concomitant medications that occurs within the first 28 days of treatment with tulmimetostat and JSB462 and meets any of the criteria specified in the protocol. The National Cancer Institute Common Terminology Criteria for Adverse events (NCI CTCAE) version 5.0 will be used for all grading. For the purpose of dose-escalation decisions, DLTs will be considered and included in the Bayesian Logistic Regression Model (BLRM).

Part 1a and Part 1b: Incidence rate of Adverse Events (AEs) and Serious Adverse Events (SAEs)
From date of randomization till 30 days safety fup, assessed up to approximately 14 months

The analysis of adverse events will include categorization by type, frequency, and severity, as graded by the NCI CTCAE version 5.0.

Part 1a and Part 1b: Number of Participants with dose adjustments
From date of randomization till 30 days safety fup, assessed up to approximately 14 months

The number of participants with dose adjustments (reductions, interruption, or permanent discontinuation) will be summarized by treatment arm.

Part 1a and Part 1b: Dose Intensity
From date of randomization till 30 days safety fup, assessed up to approximately 14 months

Dose intensity (computed as the ratio of actual cumulative dose received and actual duration of exposure) and the relative dose intensity (computed as the ratio of dose intensity and planned dose intensity) will be summarized by means of descriptive statistics

Part 1a and Part 1b: Duration of exposure to each study drug
From date of randomization till 30 days safety fup, assessed up to approximately 14 months

The duration of exposure (in months) to Tulmimetostat and JSB462 (Part 1a and Part 1b) will be summarized by means of descriptive statistics

Part 1b and Part 2: prostate-specific antigen 50 (PSA50) at Month 6
Month 6

PSA50 is defined as a PSA reduction of at least 50% from baseline at 6 months confirmed by a second PSA measurement ≥ 3 weeks later.

Secondary Endpoints

Part 1a and Part 1b: Plasma concentrations of tulmimetostat and JSB462
Cycle 1-2: Day 1 (predose/0 hour, 1 hour, 2 hours, 4 hours, 6 hours and 8 hours; Tulmimetostat only: 30 minutes and 3 hours). Cycle 1: Day 2 (24 hours), Days 8 and 15 (predose/0 hour and 2 hours). Cycles 3-5: Day 1 (predose/0 hour). 1 cycle = 28 days.
Part 2: Plasma concentrations of tulmimetostat and JSB462
Cycle 1 and 2: Day 1 (predose/0 hour and 2 hours). Cycles 3-5: Day 1 (predose/0 hour). 1 cycle = 28 days.
Part 1a and Part 1b: AUC of tulmimetostat and JSB462
Cycle 1-2: Day 1 (predose/0 hour, 1 hour, 2 hours, 4 hours, 6 hours and 8 hours; Tulmimetostat only: 30 minutes and 3 hours). Cycle 1: Day 2 (24 hours), Days 8 and 15 (predose/0 hour and 2 hours). Cycles 3-5: Day 1 (predose/0 hour). 1 cycle = 28 days.
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Part 1a: Cohort DL1AEXPERIMENTALTulmimetostat DL1 QD + JSB462 Dose 1 QD
Part 1a: Cohort DL1BEXPERIMENTALTulmimetostat DL1 QD + JSB462 Dose 2 QD
Part 1a: Cohort DL2AEXPERIMENTALTulmimetostat DL2 QD + JSB462 Dose 1 QD
Part 1a: Cohort DL2BEXPERIMENTALTulmimetostat DL2 QD + JSB462 Dose 2 QD
Part 1a: Cohort DL3AEXPERIMENTALTulmimetostat DL3 QD + JSB462 Dose 1 QD
Part 1a: Cohort DL3BEXPERIMENTALTulmimetostat DL3 QD + JSB462 Dose 2 QD
Part 1b : Arm AEXPERIMENTALTulmimetostat Dose 1 QD + JSB462 QD
Part 1b: Arm BEXPERIMENTALTulmimetostat Dose 2 QD + JSB462 QD
Part 2: Arm 1EXPERIMENTALTulmimetostat RP2D QD + JSB462 QD
Part 2: Arm 2ACTIVE_COMPARATORStandard of Care at the discretion of the investigator

Interventions

NameTypeDescription
Tulmimetostat DL1 QDDRUGPart 1a (dose escalation): Doses of tulmimetostat beyond DL1 once a day (QD) will be opened depending on outcome of Dose Escalation Meetings (DEM(s))
Tulmimetostat DL2 QDDRUGPart 1a (dose escalation): Doses of tulmimetostat beyond DL1 once a day (QD) will be opened depending on outcome of Dose Escalation Meetings (DEM(s))
Tulmimetostat DL3 QDDRUGPart 1a (dose escalation): Doses of tulmimetostat beyond DL1 once a day (QD) will be opened depending on outcome of Dose Escalation Meetings (DEM(s))
Tulmimetostat Doses 1 or 2 QDDRUGPart 1b (dose expansion and optimization): tulmimetostat doses 1 or 2 QD
Tulmimetostat RP2D QDDRUGPart 2: tulmimetostat Recommended Phase 2 Dose (RP2D) QD
JSB462 Dose 1 QDDRUGJSB462 Dose 1 QD
JSB462 Dose 2 QDDRUGJSB462 Dose 2 QD
JSB462 QDDRUGThe dose of JSB462 QD will be determined based on the totality of data from Part 1a
Standard of Care (SoC)DRUGAndrogen Receptor Pathway Inhibitors (ARPI), chemotherapy or Pluvicto (AAA617) at the discretion of the investigator
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Eligibility Criteria

Age Range18 Years to N/A
SexMALE
Healthy VolunteersNo
Study Sites35

Key Inclusion Criteria: * Participant is an adult man ≥ 18 years of age. * Participant must have histologically and/or cytologically confirmed adenocarcinoma of the prostate without neuroendocrine or small cell features (current or prior biopsy of the prostate and/or metastatic site). * Participant...

Countries:United StatesAustraliaCanadaChinaDenmarkFranceGermanyItalyMalaysiaMexicoPolandSingaporeSpainUnited Kingdom
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Recent Changes (Last 90 Days)

LOWAug 21, 2026NCT07206056lastUpdatePostDate: changed
LOWAug 21, 2026NCT07206056lastUpdatePostDate: changed
LOWAug 19, 2026NCT07206056lastUpdatePostDate: changed
LOWAug 19, 2026NCT07206056lastUpdatePostDate: changed
LOWAug 19, 2026NCT07206056lastUpdatePostDate: changed
LOWJun 23, 2026NCT07206056lastUpdatePostDate: changed
LOWJun 23, 2026NCT07206056lastUpdatePostDate: changed

Frequently asked questions about Tulmimetostat DL1

What is Tulmimetostat DL1 used for?

Tulmimetostat DL1 is an investigational small molecule being studied for the treatment of progressive metastatic castrate resistant prostate cancer (mCRPC). It is currently in Phase 1 clinical development and is not yet approved by regulatory authorities.

Who makes Tulmimetostat DL1?

Tulmimetostat DL1 is being developed by Novartis AG, a global pharmaceutical company traded on the New York Stock Exchange under the ticker symbol NVS. The drug is currently in Phase 1 clinical trials for progressive metastatic castrate resistant prostate cancer.

What phase is Tulmimetostat DL1 in?

Tulmimetostat DL1 is in Phase 1 clinical development. It is being evaluated in an open-label, active-controlled study for patients with progressive metastatic castrate resistant prostate cancer. The drug is investigational and has not received regulatory approval.

What clinical trials is Tulmimetostat DL1 in?

Tulmimetostat DL1 is being studied in the TulmiSTAR-01 trial (NCT07206056), an open-label, active-controlled Phase 1 dose escalation and expansion study. The trial is recruiting 188 male patients aged 18 years and older with progressive metastatic castrate resistant prostate cancer across multiple countries.

Is Tulmimetostat DL1 the same as Tulmimetostat DL1 QD?

Yes, Tulmimetostat DL1 is also known as Tulmimetostat DL1 QD. Both names refer to the same investigational drug being developed by Novartis AG for progressive metastatic castrate resistant prostate cancer.

How does Tulmimetostat DL1 work?

Tulmimetostat DL1 is a small molecule that belongs to the -stat class of enzyme inhibitors. It is being studied in combination with JSB462 (Luxdegalutamide) in the TulmiSTAR-01 trial for progressive metastatic castrate resistant prostate cancer.