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HDM201

Phase 1

Advanced Solid and Hematological TP53wt Tumors | Small molecule | Oncology |Novartis AG|Trials Updated: May 7, 2026

HDM201 development status

Highest phase Phase 1
Registered trials 10 across 2 sponsors since May 2014

HDM201 target and mechanism

Molecular targetMDM2
ModalitySmall molecule

Also known as Siremadlin

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials4
Total Enrollment334

FDA Designations

No designations recorded

HDM201 clinical trials

HDM201 · 4 trials · 4 indications

Phase 1 4
NCT05599932Pharmacokinetics and Safety Study of Siremadlin (HDM201) in Participants With Mild, Moderate and Severe Hepatic ImpairmentHepatic Impairment
COMPLETED38 Analytics
NCT05155709A Study of Siremadlin in Combination With Venetoclax Plus Azacitidine in Adult Participants With Acute Myeloid Leukemia (AML) Who Are Ineligible for Chemotherapy.Acute Myeloid Leukemia
COMPLETED14 Analytics
NCT02343172Study of Safety and Efficacy of HDM201 in Combination With LEE011 in Patients With LiposarcomaLiposarcoma
COMPLETED74 Analytics
NCT02143635Study to Determine and Evaluate a Safe and Tolerated Dose of HDM201 in Patients With Selected Advanced Tumors That Are TP53wtAdvanced Solid and Hematological TP53wt Tumors
COMPLETED208 Analytics
PHASE1COMPLETED
Pharmacokinetics and Safety Study of Siremadlin (HDM201) in Participants With Mild, Moderate and Severe Hepatic Impairment
Hepatic ImpairmentUnlock trial analytics
PHASE1COMPLETED
A Study of Siremadlin in Combination With Venetoclax Plus Azacitidine in Adult Participants With Acute Myeloid Leukemia (AML) Who Are Ineligible for Chemotherapy.
Acute Myeloid LeukemiaUnlock trial analytics
PHASE1COMPLETED
Study of Safety and Efficacy of HDM201 in Combination With LEE011 in Patients With Liposarcoma
LiposarcomaUnlock trial analytics
PHASE1COMPLETED
Study to Determine and Evaluate a Safe and Tolerated Dose of HDM201 in Patients With Selected Advanced Tumors That Are TP53wt
Advanced Solid and Hematological TP53wt TumorsUnlock trial analytics

Study Endpoints

Primary Endpoints

Pharmacokinetics (PK): Cmax
pre-dose, 0.5 hours, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 8 hours, 10 hours, 12 hours, 24 hours, 36 hours, 48 hours, 72 hours, 96 hours, 120 hours, and 144 hours

Maximum Observed Blood Concentrations (Cmax) for siremadlin. Blood samples will be collected to measure Cmax at indicated timepoints. Pharmacokinetic (PK) parameters will be calculated based on siremadlin blood concentrations.

Pharmacokinetics (PK): AUClast
pre-dose, 0.5 hours, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 8 hours, 10 hours, 12 hours, 24 hours, 36 hours, 48 hours, 72 hours, 96 hours, 120 hours, and 144 hours

Area Under Plasma Concentration-time Curve from time zero to the last measurable concentration sampling time (AUClast) for siremadlin. Blood samples will be collected to measure AUClast at indicated timepoints. Pharmacokinetic (PK) parameters will be calculated based on siremadlin blood concentrations.

Pharmacokinetics (PK): AUC0-t
pre-dose, 0.5 hours, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 8 hours, 10 hours, 12 hours, 24 hours, 36 hours, 48 hours, 72 hours, 96 hours, 120 hours, and 144 hours

Area Under Plasma Concentration from time zero to time "t" (AUC0-t). The definition of "t" may be data driven post-hoc to mitigate bias in the exposure comparision due to between-group differences in Tlast for siremadlin. Blood samples will be collected to measure AUC0-t at indicated timepoints. Pharmacokinetic (PK) parameters will be calculated based on siremadlin blood concentrations.

Pharmacokinetics (PK): AUC0-24h
pre-dose, 0.5 hours, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 8 hours, 10 hours, 12 hours, 24 hours, 36 hours, 48 hours, 72 hours, 96 hours, 120 hours, and 144 hours

Area Under Plasma Concentration from time zero to 24-hour post-dose sampling time (AUC0-24h) for siremadlin. Blood samples will be collected to measure AUC0-24h at indicated timepoints. Pharmacokinetic (PK) parameters will be calculated based on siremadlin blood concentrations.

Pharmacokinetics (PK): Tlast
pre-dose, 0.5 hours, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 8 hours, 10 hours, 12 hours, 24 hours, 36 hours, 48 hours, 72 hours, 96 hours, 120 hours, and 144 hours

Last measurable plasma concentration (Tlast) for siremadlin. Blood samples will be collected to measure Tlast at indicated timepoints. Pharmacokinetic (PK) parameters will be calculated based on siremadlin blood concentrations.

Pharmacokinetics (PK): Tmax
pre-dose, 0.5 hours, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 8 hours, 10 hours, 12 hours, 24 hours, 36 hours, 48 hours, 72 hours, 96 hours, 120 hours, and 144 hours

Time to Reach Maximum Blood Concentrations (Tmax) for siremadlin. Blood samples will be collected to measure Tmax at indicated timepoints. Pharmacokinetic (PK) parameters will be calculated based on siremadlin blood concentrations.

Pharmacokinetics (PK): CL/F
pre-dose, 0.5 hours, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 8 hours, 10 hours, 12 hours, 24 hours, 36 hours, 48 hours, 72 hours, 96 hours, 120 hours, and 144 hours

Apparent total body clearance of siremadlin from plasma (CL/F). Blood samples will be collected to measure CL/F at indicated timepoints. Pharmacokinetic (PK) parameters will be calculated based on siremadlin blood concentrations.

Pharmacokinetics (PK): Vz/F
pre-dose, 0.5 hours, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 8 hours, 10 hours, 12 hours, 24 hours, 36 hours, 48 hours, 72 hours, 96 hours, 120 hours, and 144 hours

Apparent volume of distribution during terminal elimination phase (Vz/F) of siremadlin. Blood samples will be collected to estimate Vz/F at indicated timepoints. Pharmacokinetic (PK) parameters will be calculated based on siremadlin blood concentrations.

Pharmacokinetics (PK): T1/2
pre-dose, 0.5 hours, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 8 hours, 10 hours, 12 hours, 24 hours, 36 hours, 48 hours, 72 hours, 96 hours, 120 hours, and 144 hours

Terminal Elimination Half-life (T1/2) for siremadlin. Blood samples will be collected to measure T1/2 at indicated timepoints. Pharmacokinetic (PK) parameters will be calculated based on siremadlin blood concentrations.

Pharmacokinetics (PK): AUCinf
pre-dose, 0.5 hours, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 8 hours, 10 hours, 12 hours, 24 hours, 36 hours, 48 hours, 72 hours, 96 hours, 120 hours, and 144 hours

Area Under Plasma Concentration from time zero to infinity (AUCinf). Blood samples will be collected to measure AUCinf at indicated timepoints. Pharmacokinetic (PK) parameters will be calculated based on siremadlin blood concentrations.

Percentage of participants with Dose Limiting Toxicities (DLTs) as per investigator assessment reported during the first cycle (separately in Arm 1 & Arm 2)
From Cycle 1 Day 1 to Cycle 1 Day 28 (28 days)

A dose-limiting toxicity (DLT) is defined as an adverse event (AE) or abnormal laboratory value considered by the Investigator to be at least possibly related to siremadlin as a single contributor or in combination with other component(s) of study treatment that occurs beginning the first day of siremadlin dosing in the study until end of cycle 1.

Percentage of participants achieving a complete remission (CR) rate at recommended dose for expansion (RDE) as per investigator assessment (Arm 1 only)
At least 7 cycles (196 days)

Assessed by CR rate. CR rate is defined as the percentage of participants with best overall response of complete remission (CR) as per investigator assessment.

Phase Ib: Incidence of Dose Limiting Toxicities (DLTs) during the first cycle of treatment.
5 years

DLTs in the first cycle of treatment.

Phase Ib: Exposure to HDM201 and LEE011 as measured by AUC 0-24h
5 years

as measured by AUC0-24h

Phase II: Progression free survival (PFS)
5 years

To assess the preliminary anti-tumor activity of HDM201 in combination with LEE011 in liposarcoma

Incidence of dose limiting toxicities (DLTs)
up to 28 days

DLTs in the first cycle of treatment.

Secondary Endpoints

Percentage of participants achieving complete remission (CR) as per Investigator assessment (Arm 2 only)
up to 3 years
Time from date of the first documented CR to the date of the first documented relapse or death due to any cause, whichever occurs first (Arm 1 and Arm 2 separately)
up to 3 years
Percentage of participants achieving CR or complete remission with partial hematological recovery (CRh) (Arm 1 & 2)
up to 3 years
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Group 1: Healthy ControlEXPERIMENTALEach healthy participant will receive a single dose of HDM201
Group 2: Mild; Child-Pugh AEXPERIMENTALEach participant with mild Child-Pugh will receive a single dose of HDM201
Group 3: Moderate; Child-Pugh BEXPERIMENTALEach participant with moderate Child-Pugh will receive a single dose of HDM201
Group 4: Severe; Child-Pugh CEXPERIMENTALEach participant with severe Child-Pugh will receive a single dose of HDM201
Arm 1: Adult participants with unfit AML who responded sub-optimally to standard of careEXPERIMENTALUnfit adult participants with unfit AML who responded sub-optimally to at least 2 and not more than 4 cycles of first-line venetoclax plus azacitidine therapy. Siremadlin was adminstered at a dose of 20 mg QD which could be increased based on toxicities; venetoclax was administered at 400 mg once daily and azacitidine was administered at 75 mg/m\^2.
Arm 2: Adult participants with newly diagnosed unfit AML with high risk clinical featuresEXPERIMENTALAdult participants with unfit AML who were newly diagnosed and presenting with high-risk clinical features (which related to factors conferring to a low likelihood of response to venetoclax plus azacitidine) and with adverse genetic risk stratification (according to ELN 2022) (Except TP53 mutation positive participants). Siremadlin was administered at a dose of 20 mg QD which could be increased based on toxicities; venetoclax was administered at 400 mg once daily and azacitidine was administered at 75 mg/m\^2.
HDM201+LEE011EXPERIMENTAL -
Arm AEXPERIMENTAL -
Arm BEXPERIMENTAL -
Arm CEXPERIMENTAL -
Arm DEXPERIMENTAL -

Interventions

NameTypeDescription
SiremadlinDRUGHDM201 capsule
venetoclaxDRUGVenetoclax is a tablet taken orally once a day (QD) and comes in 10 mg, 50 mg and 100 mg strengths.
azacitidineDRUGAzacitidine is a powder for suspension for injection or powder for solution for infusion taken intravenously or subcutaneously comes in 100 mg but was administered according to standard local clinical practice.
HDM201DRUG -
LEE011DRUG -
ancillary treatmentDRUG -
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Eligibility Criteria

Age Range18 Years to 75 Years
SexALL
Healthy VolunteersYes
Study Sites3

Key Inclusion Criteria: All participants: * Male and non-child-bearing potential females between 18 and 75 years of age, inclusive, at Screening. * Participant must have been a non-smoker or moderate smoker (up to 10 cigarettes or equivalent nicotine containing products per day) at Screening. Part...

Countries:United StatesHong KongHungaryIsraelItalyMalaysiaTurkey (Türkiye)CanadaFranceGermanySingaporeSpainTaiwanJapanNetherlands
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Frequently asked questions about HDM201

What is HDM201 used for?

HDM201 is an investigational small molecule being studied for the treatment of advanced solid and hematological TP53 wild-type tumors and liposarcoma. It is currently in Phase 1 clinical development and is not yet approved by regulatory authorities.

What does HDM201 target?

HDM201 targets MDM2, a protein that regulates the tumor suppressor p53. By inhibiting MDM2, HDM201 is designed to stabilize and activate p53 in TP53 wild-type tumors, potentially leading to cancer cell death.

Who makes HDM201?

HDM201 is being developed by Novartis AG, a multinational pharmaceutical company listed on the New York Stock Exchange under the ticker symbol NVS.

What phase is HDM201 in?

HDM201 is in Phase 1 clinical development. Two Phase 1 trials have been completed, one in liposarcoma and one in advanced TP53 wild-type tumors. The drug remains investigational and has not received FDA approval.

What clinical trials is HDM201 in?

HDM201 has been studied in two completed Phase 1 trials. NCT02343172 evaluated HDM201 in combination with LEE011 in patients with liposarcoma, enrolling 74 participants. NCT02143635 assessed HDM201 as a single agent in advanced TP53 wild-type tumors, enrolling 208 participants across multiple countries.