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AZD5305

Phase 1

Advanced Solid Malignancies | Small molecule | Oncology |AstraZeneca PLC|Last Updated: Aug 26, 2026

Target and mechanism

ModalitySmall molecule

Also known as [14C]-AZD5305 (therapeutic dose)

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials1
Total Enrollment16

FDA Designations

No designations recorded

Clinical trial landscape

AZD5305 · 3 trials · 15 indications

Phase 1 3
NCT05573724Drug-drug Interaction Study With AZD5305 and Itraconazole in Patients With Advanced Solid MalignanciesAdvanced Solid Malignancies
COMPLETED16 Analytics
NCT05367440Study of AZD5305 When Given in Combination With New Hormonal Agents in Patients With Metastatic Prostate CancerMetastatic Prostate Cancer
ACTIVE NOT_RECRUITING174 Analytics
NCT04644068Study of AZD5305 as Monotherapy and in Combination With Anti-cancer Agents in Patients With Advanced Solid MalignanciesOvarian Cancer
ACTIVE NOT_RECRUITING702 Analytics
PHASE1COMPLETED
Drug-drug Interaction Study With AZD5305 and Itraconazole in Patients With Advanced Solid Malignancies
Advanced Solid MalignanciesUnlock trial analytics
PHASE1ACTIVE NOT_RECRUITING
Study of AZD5305 When Given in Combination With New Hormonal Agents in Patients With Metastatic Prostate Cancer
Metastatic Prostate CancerUnlock trial analytics
PHASE1ACTIVE NOT_RECRUITING
Study of AZD5305 as Monotherapy and in Combination With Anti-cancer Agents in Patients With Advanced Solid Malignancies
Ovarian CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Part A: Area under the concentration-time curve from time zero to infinity (AUCinf)
Day 1-4, Day 7-13

The effect of Itraconazole on the AUCinf of AZD5305 will be assessed. The ratios of geometric means of test intervention (AZD5305 + Itraconazole; parent and metabolite\[s\], if applicable) relative to reference intervention (AZD5305 alone) of AUCinf will be presented.

Part A: AUC from time zero to time of last measurable concentration (AUClast)
Day 1-4, Day 7-13

The effect of Itraconazole on the AUClast of AZD5305 will be assessed. The ratios of geometric means of test intervention (AZD5305 + Itraconazole; parent and metabolite\[s\], if applicable) relative to reference intervention (AZD5305 alone) of AUClast will be presented.

Part A: Maximum plasma drug concentration (Cmax)
Day 1-4, Day 7-13

The effect of Itraconazole on the Cmax of AZD5305 will be assessed. The ratios of geometric means of test intervention (AZD5305 + Itraconazole; parent and metabolite\[s\], if applicable) relative to reference intervention (AZD5305 alone) of Cmax will be presented.

Part A: Apparent total body clearance of drug from plasma (CL/F)
Day 1-4, Day 7-13

The effect of Itraconazole on the PK of AZD5305 will be assessed.

Part A: Terminal elimination half-life (t½λz)
Day 1-4, Day 7-13

The effect of Itraconazole on the PK of AZD5305 will be assessed.

Part A: Time to maximum observed concentration (Tmax)
Day 1-4, Day 7-13

The effect of Itraconazole on the PK of AZD5305 will be assessed.

Part A: Apparent volume of distribution based on the terminal phase (Vz/F)
Day 1-4, Day 7-13

The effect of Itraconazole on the PK of AZD5305 will be assessed.

Number of patients with Adverse Events and Serious Adverse Events
Up to post treatment follow-up (28 days after last dose) [assessed up to 2.3 years]

Number of patients with adverse events and with serious adverse events including abnormal clinical observations, abnormal ECG parameters, abnormal laboratory assessments and abnormal vital signs that changed from baseline will be assessed.

Part A: Number of patients with Dose Limiting Toxicities (DLTs)
For Arm 1: 35 days, For Arm 2 and 3: 28 days

To assess the safety and tolerability of AZD5305 when given in combination with NHA.

The number of subjects with adverse events/serious adverse events
From time of Informed Consent to 28 + 7 days post last dose ( modules 1,2,3,5 and 6). 40+7 days post last dose for Module 4.

Number of patients with adverse events and with serious adverse events including abnormal clinical observations, abnormal ECG parameters, abnormal laboratory assessments and abnormal vital signs that changed from baseline

The number of subjects with dose-limiting toxicity (DLT), as defined in the protocol.
From first dose of study treatment until the end of Cycle 1.

A DLT is defined as any toxicity that occurs from the first dose of study treatment (either AZD5305 or combination anti-cancer agent) up to and including the planned end of Cycle 1 (the DLT assessment period) that is assessed as unrelated to the disease or disease-related processes under investigation. DLTs occurring outside the DLT window (ie, late onset toxicities) may be defined as a DLT after consultation with the sponsor and investigators, based on the emerging safety profile.

Secondary Endpoints

Part A and Part B: Number of participants with Adverse Events (AEs) and Serious Adverse events (SAEs)
Part A: From screening until post-treatment follow-up (28 days after last dose) (approximately 13 days if continuing into Part B); Part B: From Cycle 1 day 1 until Post treatment follow up (28 days after last dose) (approximately 12 months)
Part A and Part B: Number of Participants with Laboratory Value Abnormalities and/or AEs
Part A: From screening until post-treatment follow-up (28 days after last dose) (approximately 13 days if continuing into Part B); Part B: From Cycle 1 Day 1 until Post treatment follow-up (28 days after last dose) (approximately 12 months)
Part A and Part B: Number of Participants with Vital Sign Abnormalities and/or AEs
Part A: From screening until post-treatment follow-up (28 days after last dose) (approximately 13 days if continuing into Part B); Part B: From Cycle 1 Day 1 until Post treatment follow-up (28 days after last dose) (approximately 12 months)
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Treatment ArmEXPERIMENTALPart A: The participants will receive a single oral dose of AZD5305 on Day 1, followed by a 2-day washout. Then Itraconazole will be dosed for 3 days \[BD\] on Day 4 and \[OD\] on Days 5 and 6, then a single oral dose of AZD5305 administered concurrently with Itraconazole on Day 7 and only Itraconazole on Days 8 to 12. Part B: Patients proceeding to Part B after completing Part A of the study will receive AZD5305 OD as monotherapy.
Arm 1 (AZD5305 in combination with enzalutamide)EXPERIMENTALPatients will receive an oral dose of AZD5305 and Enzalutamide once daily until disease progression, initiation of alternative anticancer therapy, unacceptable toxicity, withdrawal of consent, or other reasons to discontinue study treatment occur.
Arm 2 (AZD5305 in combination with abiraterone acetate)EXPERIMENTALPatients will receive an oral dose of AZD5305 and Abiraterone Acetate once daily until disease progression, initiation of alternative anticancer therapy, unacceptable toxicity, withdrawal of consent, or other reasons to discontinue study treatment occur.
Arm 3 (AZD5305 in combination with darolutamide)EXPERIMENTALPatients will receive an oral dose of AZD5305 once daily and Darolutamide twice daily until disease progression, initiation of alternative anticancer therapy, unacceptable toxicity, withdrawal of consent, or other reasons to discontinue study treatment occur.
Arm 4 (AZD5305 in combination with apalutamide)EXPERIMENTALPatients will receive an oral dose of AZD5305 and Apalutamide once daily until disease progression, initiation of alternative anticancer therapy, unacceptable toxicity, withdrawal of consent, or other reasons to discontinue study treatment occur.
Module 1: AZD5305 MonotherapyEXPERIMENTALAZD5305 Monotherapy
Module 2: AZD5305 + PaclitaxelEXPERIMENTALAZD5305 + Paclitaxel
Module 3: AZD5305 + Carboplatin with or without PaclitaxelEXPERIMENTALAZD5305 + Carboplatin with or without Paclitaxel
Module 4: AZD5305 + Trastuzumab DeruxtecanEXPERIMENTALAZD5305 + T- DXd
Module 5 AZD5305 + Datopotamab DeruxtecanEXPERIMENTALAZD5305 + Dato-DXd
Module 6 AZD5305 + CamizestrantEXPERIMENTALAZD5305 + Camizestrant

Interventions

NameTypeDescription
AZD5305DRUGIn Part A, the participants will receive a single dose of AZD5305 on Day 1 and Day 7. In Part B, the participants will receive AZD5305 once daily.
ItraconazoleDRUGIn Part A, the participants will receive Itraconazole twice daily on Day 4 and once daily on Days 5-12
EnzalutamideDRUGPatients will receive an oral dose of Enzalutamide once daily
Abiraterone AcetateDRUGPatients will receive an oral dose of Abiraterone Acetate once daily
DarolutamideDRUGPatients will receive an oral dose of Darolutamide twice daily
ApalutamideDRUGPatients will receive an oral dose of Apalutamide once daily
PaclitaxelDRUGIV Anti-microtubule agent
CarboplatinDRUGIV Platinum chemotherapeutic
T- DxdDRUGIV Antibody-drug conjugate
Dato-DXdDRUGIV Antibody-drug conjugate
CamizestrantDRUGOral SERD Molecule
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Eligibility Criteria

Age Range18 Years to 130 Years
SexALL
Healthy VolunteersNo
Study Sites2

Inclusion Criteria: * Provision of signed and dated, written informed consent prior to any study specific procedures, sampling and analyses. * Males and females aged ≥ 18 years at the time of screening. * Patients with documented evidence of locally advanced unresectable or metastatic solid tumours...

Countries:MoldovaRomaniaUnited StatesAustraliaItalyUnited KingdomCanadaChinaCzechiaHungaryJapanPolandRussiaSouth KoreaSpainUkraine
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Recent Changes (Last 90 Days)

LOWAug 26, 2026NCT05367440lastUpdatePostDate: changed
LOWAug 26, 2026NCT05367440lastUpdatePostDate: changed
LOWAug 20, 2026NCT04644068lastUpdatePostDate: changed
LOWAug 20, 2026NCT04644068lastUpdatePostDate: changed
LOWAug 20, 2026NCT04644068lastUpdatePostDate: changed
LOWAug 20, 2026NCT04644068lastUpdatePostDate: changed

Frequently asked questions about AZD5305

What is AZD5305 used for?

AZD5305 is an investigational small molecule being studied for the treatment of advanced solid malignancies, ovarian cancer, and metastatic prostate cancer. It is being evaluated in clinical trials for these oncology indications.

Who makes AZD5305?

AZD5305 is being developed by AstraZeneca PLC, which trades under the ticker AZN. The company is conducting clinical trials to evaluate the drug's safety and efficacy in patients with various advanced cancers.

What phase is AZD5305 in?

AZD5305 is in Phase 1 clinical development. It is an investigational drug and has not been approved by regulatory authorities. The ongoing trials are designed to assess its safety, tolerability, and preliminary efficacy in patients with advanced solid tumors.

What clinical trials is AZD5305 in?

AZD5305 is being studied in three Phase 1 trials: NCT04644068, a monotherapy and combination study in advanced solid malignancies with 702 participants; NCT05367440, a combination study with new hormonal agents in metastatic prostate cancer with 174 participants; and NCT05573724, a drug-drug interaction study with itraconazole in advanced solid malignancies, which has been completed.

Is AZD5305 the same as [14C]-AZD5305?

AZD5305 is also known as [14C]-AZD5305 when administered at a therapeutic dose. The radiolabeled form is used in clinical studies to track the drug's absorption, distribution, metabolism, and excretion in the body.