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Saruparib

Phase 3

Advanced Breast Cancer | Small molecule | Oncology |AstraZeneca PLC|Last Updated: Sep 2, 2026

Target and mechanism

Target class-Parib (Parp)
ModalitySmall molecule

Also known as Saruparib (AZD5305)

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLEDDMC
Total Trials1
Total Enrollment788

FDA Designations

No designations recorded

Clinical trial landscape

Saruparib · 7 trials · 6 indications

Phase 3 4Phase 1 3
NCT07711002Saruparib in Combination With Physician's Choice of ARPI in Patients With mHSPC Previously Treated With Docetaxel or 177Lu-PSMA Therapy Without Disease Progression and PSA ≥ 0.2 ng/mL (EvoPAR-PR05)Metastatic Hormone-Sensitive Prostate Cancer (mHSPC)
NOT YET_RECRUITING1,330 Analytics
NCT06952803A Study of Metastases Free Survival With Saruparib vs Placebo Added to a Standard RT/ADT in Men With High-risk Prostate Cancer With a BRCA MutationProstate Cancer
RECRUITING700 Analytics
NCT06380751Saruparib (AZD5305) Plus Camizestrant or Plus Endocrine Therapy, Compared With CDK4/6 Inhibitor Plus Endocrine Therapy or Plus Camizestrant in HR-Positive, HER2-Negative (IHC 0, 1+, 2+/ ISH Non-amplified), BRCA1, BRCA2, or PALB2m Advanced Breast CancerAdvanced Breast Cancer
RECRUITING788 Analytics
NCT06120491Saruparib (AZD5305) vs Placebo in Men With Metastatic Castration-Sensitive Prostate Cancer Receiving Physician's Choice New Hormonal AgentsMetastatic Castration-Sensitive Prostate Cancer
ACTIVE NOT_RECRUITING1,898 Analytics
PHASE3NOT YET_RECRUITING
Saruparib in Combination With Physician's Choice of ARPI in Patients With mHSPC Previously Treated With Docetaxel or 177Lu-PSMA Therapy Without Disease Progression and PSA ≥ 0.2 ng/mL (EvoPAR-PR05)
Metastatic Hormone-Sensitive Prostate Cancer (mHSPC)Unlock trial analytics
PHASE3RECRUITING
A Study of Metastases Free Survival With Saruparib vs Placebo Added to a Standard RT/ADT in Men With High-risk Prostate Cancer With a BRCA Mutation
Prostate CancerUnlock trial analytics
PHASE3RECRUITING
Saruparib (AZD5305) Plus Camizestrant or Plus Endocrine Therapy, Compared With CDK4/6 Inhibitor Plus Endocrine Therapy or Plus Camizestrant in HR-Positive, HER2-Negative (IHC 0, 1+, 2+/ ISH Non-amplified), BRCA1, BRCA2, or PALB2m Advanced Breast Cancer
Advanced Breast CancerUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
Saruparib (AZD5305) vs Placebo in Men With Metastatic Castration-Sensitive Prostate Cancer Receiving Physician's Choice New Hormonal Agents
Metastatic Castration-Sensitive Prostate CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Radiographic progression-free survival (rPFS)
Up to approximately 56 months

Radiographic PFS (rPFS) is the primary endpoint of this study, defined as the time from randomization to radiographic progression, as assessed by the investigator per RECIST 1.1 (soft tissue) and/or PCWG3 criteria (bone), or death due to any cause.

Metastasis-free survival (MFS)
Up to approximately 93 months

MFS is defined as the time from randomisation until the date of first appearance of distant metastases, confirmed by standard clinical imaging \[computed tomography (CT)/ magnetic resonance imaging (MRI) and bone scan, or prostate-specific membrane antigen-positron emission tomography (PSMA-PET)\], as assessed by blinded independent central review (BICR) or death due to any cause.

Progression-Free Survival (Arm 1 vs arm 2)
Up to approximately 64 months

PFS is defined as time from randomisation until progression per RECIST v1.1 as assessed by BICR, or death due to any cause.

Absolute bioavailability (F) of Saruparib
Day 4
Total radioactivity recovery in urine and faeces
Day 8
Pharmacokinetics of Saruparib(Part B)
Day 8

AUCinf

PK parameters characterized by AUCinf
Day 4

AUCinf

Ratio of AUCinf of plasma Saruparib relative to AUCinf of metabolite
Day 4
Mass balance parameters as characterized by amount excreted and cumulative amount excreted in urine, faeces and total (urine and faeces combined)
Day 8

Cumulative amount excreted in urine, faeces and total (urine and faeces combined)

Amount excreted and cumulative amount excreted in urine, faeces and total (urine and faeces combined) expressed as a percentage of the administered dose
Day 8

Amount excreted and cumulative amount excreted in urine, faeces and total (urine and faeces combined) expressed as a percentage of the administered dose.

PK parameters characterized by AUClast
Day 4

AUClast

PK parameters characterized by Cmax
Day 4

Cmax

PK parameters characterized by tmax
Day 4

tmax

PK parameters characterized by t1/2(lambda)z
Day 4

t1/2(lambda)z

Module 1: Area under plasma concentration-time curve from zero extrapolated to infinity (AUCinf) of digoxin, furosemide, metformin and rosuvastatin when dosed alone and in combination with saruparib
Period 1: Days 1 to 5. Period 2: Days 5 to 9

To evaluate the effects of saruparib on the PK of substrates of human drug transporters digoxin, furosemide, metformin hydrochloride, and rosuvastatin in participants with advanced solid malignancies.

Module 1: Area under the plasma concentration curve from zero to the last quantifiable concentration (AUClast) of digoxin, furosemide, metformin and rosuvastatin when dosed alone and in combination with saruparib
Period 1: Days 1 to 5. Period 2: Days 5 to 9

To evaluate the effects of saruparib on the PK of substrates of human drug transporters digoxin, furosemide, metformin hydrochloride, and rosuvastatin in participants with advanced solid malignancies.

Module 1: Maximum observed plasma (peak) drug concentration (Cmax) of digoxin, furosemide, metformin and rosuvastatin when dosed alone and in combination with saruparib
Period 1: Days 1 to 5. Period 2: Days 5 to 9

To evaluate the effects of saruparib on the PK of substrates of human drug transporters digoxin, furosemide, metformin hydrochloride, and rosuvastatin in participants with advanced solid malignancies.

Module 2: AUClast between DC and RC tablets of saruparib
Period 1: Days 1 to 3. Period 2: Days 1 to 3

To assess the relative bioavailability of saruparib tablets manufactured using a DC process versus RC process under fasted conditions.

Module 2: AUCinf between DC and RC tablets of saruparib
Period 1: Days 1 to 3. Period 2: Days 1 to 3

To assess the relative bioavailability of saruparib tablets manufactured using a DC process versus RC process under fasted conditions.

Module 2: Cmax between DC and RC tablets of saruparib
Period 1: Days 1 to 3. Period 2: Days 1 to 3

To assess the relative bioavailability of saruparib tablets manufactured using a DC process versus RC process under fasted conditions.

Module 2: AUClast of DC saruparib tablets in the presence and absence of rabeprazole relative to the RC tablet
Period 3: Days 4 to 6

To evaluate the effect of rabeprazole on saruparib PK profile following the administration of saruparib DC tablets.

Module 2: AUCinf of DC saruparib tablets in the presence and absence of rabeprazole relative to the RC tablet
Period 3: Days 4 to 6

To evaluate the effect of rabeprazole on saruparib PK profile following the administration of saruparib DC tablets.

Module 2: Cmax of DC saruparib tablets in the presence and absence of rabeprazole relative to the RC tablet
Period 3: Days 4 to 6

To evaluate the effect of rabeprazole on saruparib PK profile following the administration of saruparib DC tablets.

Fold change in % γH2AX positive cells from baseline value in tumour samples
Tumour biopsy taken at diagnosis within approx 2 months of Day 1 planned start of study treatment; post treatment tumour biopsy taken following 21 days (+ up to 7 days) of study treatment

To assess the effects of study treatment on γH2AX change in participants with localised prostate cancer

Secondary Endpoints

Overall Survival (OS)
Up to approximately 80 months
Radiographic progression-free survival (rPFS)
Up to approximately 56 months
Time to Second Progression or Death (PFS2)
Up to approximately 56 months
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Saruparib (AZD5305) + Physician's Choice ARPI - enzalutamide, darolutamide, or abirateroneEXPERIMENTALSaruparib 60 mg + ARPI (enzalutamide, darolutamide, or abiraterone) : Participants will receive saruparib 60 mg orally once daily in combination with physician's choice of ARPI in cycles of 28 days
Placebo + Physician's Choice ARPI - enzalutamide, darolutamide, or abirateronePLACEBO_COMPARATORPlacebo + ARPI (enzalutamide, darolutamide, or abiraterone): Participants will receive placebo orally once daily in combination with physician's choice of ARPI in cycles of 28 days
Cohort A: Saruparib (AZD5305) + Physician's Choice ADTEXPERIMENTALParticipants will receive saruparib along with ADT.
Cohort A: Placebo + Physician's Choice ADTPLACEBO_COMPARATORParticipants will receive matching placebo to saruparib along with ADT.
Cohort B: Saruparib (AZD5305) + Physician's Choice ADT + Abiraterone (and prednisone/prednisolone)EXPERIMENTALParticipants will receive saruparib, abiraterone and prednisolone/prednisone along with ADT.
Cohort B: Placebo + Physician's Choice ADT + Abiraterone (and prednisone/prednisolone)PLACEBO_COMPARATORParticipants will receive matching placebo to saruparib, abiraterone and prednisolone/prednisone along with ADT.
Arm 1: saruparib (AZD5305) plus camizestrantEXPERIMENTALparticipants will receive saruparib (AZD5305) orally and camizestrant orally
Arm 2: Physician's choice CDK4/6i plus physician's choice ETACTIVE_COMPARATORagents are indicated below and should follow local guidelines: * Physician's Choice CDK4/6i: * abemaciclib orally, or * ribociclib orally, or * palbociclib orally. * Physician's Choice ET: * fulvestrant intramuscularly, or * One of the following AIs: * letrozole orally, or * anastrozole orally, or * exemestane orally
Arm 3: Physician's choice CDK4/6i plus camizestrantEXPERIMENTALparticipants will receive camizestrant orally. Agents for CDK4/6i treatment are indicated above and should follow local guidelines
Arm 4: Saruparib (AZD5305) plus physician's choice ETEXPERIMENTALparticipants will receive Saruparib (AZD5305) plus -Physician's Choice ET: * fulvestrant intramuscularly, or * One of the following AIs: * letrozole orally, or * anastrozole orally, or * exemestane orally
Arm 1: Saruparib (AZD5305) + Physician's Choice NHAEXPERIMENTALSaruparib (AZD5305) + physician's choice NHA (Abiraterone, Darolutamide, or Enzalutamide)
Arm 2: Placebo + Physician's Choice NHAPLACEBO_COMPARATORPlacebo + physician's choice NHA (Abiraterone, Darolutamide, or Enzalutamide)
Primary Treatment Arm - AZD5305EXPERIMENTALPart A will assess absolute bioavailability via oral administration of Saruparib (AZD5305) and IV \[14C\]-saruparib microtracer. Part B will assess ADME via IV \[14C\]-saruparib administration
Treatment Cohort (Module 1)ACTIVE_COMPARATORPeriod 1: participants will receive a single oral dose of cocktail substrate (digoxin, furosemide, metformin hydrochloride, and rosuvastatin) on Day 1. Period 2: participants will receive a single dose saruparib from Day 1 to 9, and a single dose of cocktail substrate on Day 5 in combination with saruparib. Period 3: participants will receive a single oral dose of saruparib daily.
Saruparib RC Cohort (Module 2)ACTIVE_COMPARATORPeriod 1: participants will receive a single dose of RC saruparib. Period 2: participants will receive a single dose of DC saruparib. Period 3: participants will receive rabeprazole twice daily from Day 1 to 3, and a single dose of rabeprazole prior to DC saruparib on Day 4. Period 4: participants will receive RC saruparib daily for up to 3 cycles.
Saruparib DC Cohort (Module 2)ACTIVE_COMPARATORPeriod 1: participants will receive a single dose of DC saruparib. Period 2: participants will receive a single dose of RC saruparib. Period 3: participants will receive rabeprazole twice daily from Day 1 to 3, and a single dose of rabeprazole prior to DC saruparib on Day 4. Period 4: participants will receive RC saruparib daily for up to 3 cycles.
Saruparib (AZD5305) onlyOTHERParticipant will receive Saruparib (AZD5305) once daily for 21 days (+ up to 7 days) unless unacceptable toxicity or withdrawal of consent. Following the 21 days of study treatment, participants should undergo radical prostatectomy on Day 22 (+ up to 7 days)
Saruparib (AZD5305) + DarolutamideOTHERParticipant will receive Saruparib (AZD5305) once daily + darolutamide twice daily for 21 days (+ up to 7 days) unless unacceptable toxicity or withdrawal of consent. Following the 21 days of study treatment, participants should undergo radical prostatectomy on Day 22 (+ up to 7 days).
No TreatmentOTHERNo study treatment is to be taken by the participants in this arm. Radical prostatectomy should be performed as per local practice
Darolutamide OnlyOTHERParticipant will receive darolutamide twice daily for 21 days (+ up to 7 days) unless unacceptable toxicity or withdrawal of consent. Following the 21 days of study treatment, participants should undergo radical prostatectomy on Day 22 (+ up to 7 days).

Interventions

NameTypeDescription
SaruparibDRUGArm 1: Saruparib (AZD5305) + Physician's Choice ARPI (enzalutamide, darolutamide, or abiraterone)
PlaceboOTHERArm 2: Placebo + Physician's Choice ARPI (enzalutamide, darolutamide, or abiraterone)
EnzalutamideDRUGArm 1: Saruparib (AZD5305) + Physician's Choice ARPI (enzalutamide, darolutamide, or abiraterone) Arm 2: Placebo + Physician's Choice ARPI
DarolutamideDRUGArm 1: Saruparib (AZD5305) + Physician's Choice ARPI (enzalutamide, darolutamide, or abiraterone) Arm 2: Placebo + Physician's Choice ARPI
AbirateroneDRUGArm 1: Saruparib (AZD5305) + Physician's Choice ARPI (enzalutamide, darolutamide, or abiraterone) Arm 2: Placebo + Physician's Choice ARPI
Abiraterone + Prednisolone/PrednisoneDRUGAbiraterone will be administered orally in combination with prednisone/prednisolone.
Androgen Deprivation Therapy (ADT)DRUGStandard of care ADT will be administered.
Saruparib (AZD5305)DRUGSaruparib (AZD5305) is a potent and selective inhibitor of PARP1, with minimal effect on PARP2.
CamizestrantDRUGCamizestrant (AZD9833) is an orally bioavailable, next generation SERD with non-clinical and clinical activity in both ESR1 mutant and wild type settings .
AbemaciclibDRUGCDK4/6 Inhibitor
RibociclibDRUGCDK4/6 Inhibitor
PalbociclibDRUGCDK 4/6 Inhibitor
FulvestrantDRUGEndocrine Therapy
LetrozoleDRUGEndorcine Therapy
AnastrozoleDRUGEndocrine Therapy
ExemestaneDRUGEndocrine Therapy
Abiraterone AcetateDRUGOral
[14C]-AZD5305 microtracerDRUGIV radiolabeled microtracer
[14C]-AZD5305 (therapeutic dose)DRUGIV radiolabeled PARP inhibitor
DigoxinDRUGPeriod 1: participants will receive a single oral dose of a cocktail of substrates (digoxin, furosemide, metformin hydrochloride, and rosuvastatin) on Day 1. Period 2: participants will receive a single oral dose of the cocktail of substrates in combination with saruparib on Day 5.
FurosemideDRUGPeriod 1: participants will receive a single oral dose of a cocktail of substrates (digoxin, furosemide, metformin hydrochloride, and rosuvastatin) on Day 1. Period 2: participants will receive a single oral dose of the cocktail of substrates in combination with saruparib on Day 5.
Metformin HydrochlorideDRUGPeriod 1: participants will receive a single oral dose of a cocktail of substrates (digoxin, furosemide, metformin hydrochloride, and rosuvastatin) on Day 1. Period 2: participants will receive a single oral dose of the cocktail of substrates in combination with saruparib on Day 5.
RosuvastatinDRUGPeriod 1: participants will receive a single oral dose of a cocktail of substrates (digoxin, furosemide, metformin hydrochloride, and rosuvastatin) on Day 1. Period 2: participants will receive a single oral dose of the cocktail of substrates in combination with saruparib on Day 5.
RabeprazoleDRUGPeriod 3: Participants will receive two doses of rabeprazole per day from Day 1 to 3. On Day 4, participants will receive a dose of rabeprazole followed by DC saruparib.
No TreatmentOTHERNo study treatment is to be taken by the participants in this arm. Radical prostatectomy should be performed as per local practice
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Eligibility Criteria

Age Range18 Years to N/A
SexMALE
Healthy VolunteersNo
Study Sites2

Inclusion Criteria: * Participant must be ≥ 18 at the time of signing the informed consent. * Histologically documented diagnosis of prostate adenocarcinoma that is de novo or recurrent and hormone-sensitive. * Metastatic disease confirmed prior to initiation of previous treatment with docetaxel or...

Countries:CanadaUnited StatesArgentinaAustraliaAustriaBelgiumBrazilChileChinaFinlandFranceGermanyHungaryIndiaIsraelItalyJapanMalaysiaNetherlandsPeruPolandSouth KoreaSpainSwedenTaiwanThailandTurkey (Türkiye)United KingdomBulgariaCzechiaHong KongPortugalPuerto RicoMoldovaRomania
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Competitive Landscape -Breast Cancer 402 trials (matched to "Advanced Breast Cancer")

Top 20 of 92 competitors

CompanyTickerTrialsLead PhaseDrugs
AstraZeneca PLCAZN47PHASE3Fulvestrant, Capivasertib
Merck & Co., Inc.MRK12PHASE3Pembrolizumab, Paclitaxel, Doxorubicin, Epirubicin, Cyclophosphamide
Eli Lilly and CompanyLLY27PHASE3Abemaciclib, Standard Adjuvant Endocrine Therapy
BioNTech SE Sponsored ADRBNTX7PHASE3DB-1303/BNT323, T-DM1
Gilead Sciences, Inc.GILD13PHASE3Sacituzumab Govitecan-hziy, Eribulin, Capecitabine Product, Gemcitabine, Vinorelbine
Novartis AG Sponsored ADRNVS30PHASE3Ribociclib
Pfizer Inc.PFE34PHASE3ARV-471, Fulvestrant
BeOne Medicines Ltd. Sponsored ADRONC5PHASE3BGB-43395, Letrozole, Abemaciclib, Palbociclib, Ribociclib
Olema Pharmaceuticals, Inc.OLMA5PHASE3Palazestrant, Fulvestrant, Anastrozole, Letrozole, Exemestane
Jazz Pharmaceuticals Public Limited CompanyJAZZ3PHASE3Zanidatamab, Trastuzumab, Eribulin, Vinorelbine, Gemcitabine
Celcuity Inc.CELC3PHASE3Gedatolisib, Palbociclib, Fulvestrant, Alpelisib
Relay Therapeutics, Inc.RLAY2PHASE3Zovegalisib, Capivasertib, Fulvestrant
GSK plc Sponsored ADRGSK2PHASE3Niraparib
Greenwich LifeSciences, Inc.GLSI1PHASE3GLSI-100
Bristol-Myers Squibb CompanyBMY5PHASE2Iza-bren, Nab-paclitaxel, Paclitaxel, Capecitabine, Carboplatin
BriaCell Therapeutics CorpBCTX2PHASE3SV-BR-1-GM, Cyclophosphamide, Interferon infiltration of the inoculation site, Retifanlimab, Treatment of Physician's Choice
Incyte CorporationINCY4PHASE2Ruxolitinib, Capecitabine, Regorafenib
Natera, Inc.NTRA3PHASE2Discontinuation of the anti-HER2 maintenance therapy
Puma Biotechnology, Inc.PBYI3PHASE2Neratinib, Loperamide, Colesevelam
Atossa Therapeutics, Inc.ATOS1PHASE2endoxifen, goserelin
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Recent Changes (Last 90 Days)

LOWSep 2, 2026NCT06380751lastUpdatePostDate: changed
LOWSep 2, 2026NCT06899061lastUpdatePostDate: changed
LOWSep 2, 2026NCT06380751lastUpdatePostDate: changed
LOWSep 2, 2026NCT06899061lastUpdatePostDate: changed
LOWSep 2, 2026NCT06380751lastUpdatePostDate: changed
LOWSep 2, 2026NCT06899061lastUpdatePostDate: changed
LOWAug 21, 2026NCT06952803lastUpdatePostDate: changed
LOWAug 21, 2026NCT06952803lastUpdatePostDate: changed
MEDIUMJul 31, 2026NCT05938270TRIAL_REMOVED: changed
MEDIUMJul 31, 2026NCT05938270TRIAL_REMOVED: changed
MEDIUMJul 31, 2026NCT05938270TRIAL_REMOVED: changed
MEDIUMJul 30, 2026NCT06380751Enrollment: 500 → 788
MEDIUMJul 30, 2026NCT06899061Completion: 2026-04-30 → 2028-05-19
MEDIUMJul 30, 2026NCT06380751Enrollment: 500 → 788
MEDIUMJul 30, 2026NCT06899061Completion: 2026-04-30 → 2028-05-19
LOWJul 29, 2026NCT06120491Enrollment: 1889 → 1898
LOWJul 29, 2026NCT06120491Enrollment: 1889 → 1898
LOWJul 21, 2026NCT06952803lastUpdatePostDate: changed
LOWJul 17, 2026NCT07711002NEW_TRIAL: changed
LOWJul 17, 2026NCT07711002NEW_TRIAL: changed

Frequently asked questions about Saruparib

What is Saruparib used for?

Saruparib is an investigational small molecule being studied for multiple cancers, including metastatic hormone-sensitive prostate cancer (mHSPC), metastatic castration-sensitive prostate cancer, advanced breast cancer, and advanced solid malignancies. It is currently in Phase 3 clinical trials for prostate and breast cancer indications.

What does Saruparib target?

Saruparib is a PARP inhibitor, as indicated by its '-parib' target class. It is being evaluated in combination with other therapies for cancers with specific genetic mutations, such as BRCA1, BRCA2, or PALB2 in advanced breast cancer.

Who makes Saruparib?

Saruparib is being developed by AstraZeneca PLC, a global biopharmaceutical company listed on the stock exchange under the ticker symbol AZN. AstraZeneca is conducting multiple clinical trials to evaluate the drug's safety and efficacy in various cancer indications.

What phase is Saruparib in?

Saruparib is in Phase 3 clinical development for metastatic hormone-sensitive prostate cancer, metastatic castration-sensitive prostate cancer, and advanced breast cancer. It is also being studied in a Phase 1 trial for advanced solid malignancies. Saruparib is investigational and not yet approved by regulatory authorities.

What clinical trials is Saruparib in?

Saruparib is being studied in several clinical trials, including NCT06120491, a Phase 3 trial in metastatic castration-sensitive prostate cancer; NCT06380751, a Phase 3 trial in advanced breast cancer; NCT06899061, a Phase 1 drug-drug interaction study; and NCT07711002, a Phase 3 trial in mHSPC.

Is Saruparib the same as AZD5305?

Yes, Saruparib is also known as AZD5305. The drug is referred to by both names in clinical trial documentation and scientific literature. Researchers and investors may encounter either name when searching for information about this investigational PARP inhibitor.