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Capivasertib

Phase 3

Locally Advanced (Inoperable) or Metastatic Breast Cancer | Small molecule | Oncology |AstraZeneca PLC|Last Updated: Jul 6, 2026

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Trial Design
RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials2
Total Enrollment1,713
FDA Designations
No designations recorded
Clinical trial landscape

Capivasertib · 19 trials · 20 indications

Phase 3 7Phase 2 3Phase 1 9
NCT06764186A Phase IIIB Study to Evaluate the Use of Capivasertib in Combination With Fulvestrant in Patients With Advanced Breast Cancer Who Have Relapsed/Progressed on ET and CDK4/6 Inhibitor Reflecting Real World Clinical Practice in SpainLocally Advanced or Metastatic Breast Cancer
ACTIVE NOT_RECRUITING101 Analytics
NCT06635447Capivasertib+Fulvestrant asTreatment for Locally Advanced(Inoperable) or Metastatic HR+/HER2- Breast Cancer in Chinese PatientsBreast Cancer
ACTIVE NOT_RECRUITING258 Analytics
NCT05348577Study of Capivasertib + Docetaxel vs Placebo + Docetaxel as Treatment for Metastatic Castration Resistant Prostate Cancer (mCRPC)Prostate Cancer
ACTIVE NOT_RECRUITING1,035 Analytics
NCT04862663Capivasertib + CDK4/6i + Fulvestrant for Advanced/Metastatic HR+/HER2- Breast Cancer (CAPItello-292)Locally Advanced (Inoperable) or Metastatic Breast Cancer
RECRUITING895 Analytics
NCT04493853Capivasertib+Abiraterone as Treatment for Patients With Metastatic Hormone-sensitive Prostate Cancer and PTEN DeficiencyHormone-Sensitive Prostate Cancer
ACTIVE NOT_RECRUITING1,012 Analytics
NCT04305496Capivasertib+Fulvestrant vs Placebo+Fulvestrant as Treatment for Locally Advanced (Inoperable) or Metastatic HR+/HER2- Breast CancerLocally Advanced (Inoperable) or Metastatic Breast Cancer
ACTIVE NOT_RECRUITING818 Analytics
NCT03997123Capivasertib+Paclitaxel as First Line Treatment for Patients With Locally Advanced or Metastatic TNBCTriple Negative Breast Neoplasms
ACTIVE NOT_RECRUITING923 Analytics
PHASE3ACTIVE NOT_RECRUITING
A Phase IIIB Study to Evaluate the Use of Capivasertib in Combination With Fulvestrant in Patients With Advanced Breast Cancer Who Have Relapsed/Progressed on ET and CDK4/6 Inhibitor Reflecting Real World Clinical Practice in Spain
Locally Advanced or Metastatic Breast CancerUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
Capivasertib+Fulvestrant asTreatment for Locally Advanced(Inoperable) or Metastatic HR+/HER2- Breast Cancer in Chinese Patients
Breast CancerUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
Study of Capivasertib + Docetaxel vs Placebo + Docetaxel as Treatment for Metastatic Castration Resistant Prostate Cancer (mCRPC)
Prostate CancerUnlock trial analytics
PHASE3RECRUITING
Capivasertib + CDK4/6i + Fulvestrant for Advanced/Metastatic HR+/HER2- Breast Cancer (CAPItello-292)
Locally Advanced (Inoperable) or Metastatic Breast CancerUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
Capivasertib+Abiraterone as Treatment for Patients With Metastatic Hormone-sensitive Prostate Cancer and PTEN Deficiency
Hormone-Sensitive Prostate CancerUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
Capivasertib+Fulvestrant vs Placebo+Fulvestrant as Treatment for Locally Advanced (Inoperable) or Metastatic HR+/HER2- Breast Cancer
Locally Advanced (Inoperable) or Metastatic Breast CancerUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
Capivasertib+Paclitaxel as First Line Treatment for Patients With Locally Advanced or Metastatic TNBC
Triple Negative Breast NeoplasmsUnlock trial analytics
Study Endpoints
Primary Endpoints
Time to next treatment (TTNT)
From start of date of first dose of capivasertib+fulvestrant treatment to date of the first subsequent anti-cancer therapy or death or up to within approximately 12 months after Last Subject Inclusion

Time to next treatment (TTNT1 is defined as the time from the date of first dose of capivasertib+fulvestrant until the first subsequent anti-cancer therapy after discontinuation of study treatment or death due to any cause).

Time to first subsequent treatment (TFST) of PIK3CA/AKT1/PTEN-altered population in Cohort 1
From the first dose of study intervention to the earlier of start date of the first subsequent therapy after discontinuation of study intervention, or death in PIK3CA/AKT1/PTEN-altered population in Cohort 1, up to approximately 2 years

To assess the efficacy of capi+ful by assessment of TFST (Time to first subsequent treatment) of PIK3CA/AKT1/PTEN-altered subgroup in cohort1

Overall Survival (OS) in the overall population
up to approximately 46 months

Overall survival is defined as time from randomisation until the date of death due to any cause.

Radiographic Progression-free Survival (rPFS) in the overall population
up to approximately 37 months

Radiographic Progression-free Survival (rPFS) is defined as time from randomization to radiographic progression as assessed by the investigator per Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST 1.1) for soft tissue and/or Prostate Cancer Working Group 3 (PCWG3) for bone or death due to any cause

Phase Ib: 1. The number of participants with dose-limiting toxicity, as defined in the protocol.
Within the first 28 day cycle.

Dose-limiting toxicity as described in the protocol that is not related to disease progression, intercurrent illness or concomitant medications and that, despite optimal therapeutic intervention, meets protocol-defined criteria.

Phase Ib: 2. The number of participants with treatment-related adverse events.
From baseline up to approximately 36 months.

Data will include clinical observations, ECG parameters, clinical chemistry and haematology and vital signs assessed as the number of participants with treatment-related adverse events.

Phase Ib: 3. The number of participants with treatment-related serious adverse events.
From baseline up to approximately 36 months.

Data will include clinical observations, ECG parameters, clinical chemistry and haematology and vital signs assessed as the number of participants with treatment-related adverse events.

Phase III: 1. Progression Free Survival (PFS).
Up to approximately 47 months.

Progression Free Survival (PFS) is defined as time from randomization until progression per RECIST v1.1. as assessed by BICR or death due to any cause in the overall population, the altered population, and the confirmed non-altered population. RECIST related endpoints such as PFS, ORR, DoR, CBR will be collected.

Radiographic Progression-free Survival (rPFS)
Up to approximately 55 months

rPFS is defined as the time from randomisation to radiographic progression, as assessed by the investigator per Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST) for soft tissue and/or Prostate Cancer Working Group 3 (PCWG3) for bone, or death due to any cause for each study arm.

Progression Free Survival: Overall Population (Months) in the Global Cohort
Assessed every 8 weeks for the first 18 months and every 12 weeks thereafter, from randomization to radiological progression.

Progression free survival (PFS), defined as the time from randomization until progression per RECIST v1.1, as assessed by the investigator at the local site, or death due to any cause, in the global cohort. Participants who discontinue treatment prior to progression should continue to be scanned until progression. Progression is defined using Response Evaluation Criteria In Solid Tumors Criteria (RECIST v1.1) as at least a 20% increase in the sum of the longest diameter of target lesions (short axis diameter used for lymph nodes), or clinically significant increase in a non-target lesion, or the appearance of a new lesion(s).

Progression Free Survival: Overall Population (Percentage) in the Global Cohort
Assessed every 8 weeks for the first 18 months and every 12 weeks thereafter, from randomization to radiological progression.

Progression free survival (PFS), defined as the time from randomization until progression per RECIST v1.1, as assessed by the investigator at the local site, or death due to any cause. Progression is defined using Response Evaluation Criteria In Solid Tumors Criteria (RECIST v1.1) as at least a 20% increase in the sum of the longest diameter of target lesions (short axis diameter used for lymph nodes), or clinically significant increase in a non-target lesion, or the appearance of a new lesion(s). Participants who discontinue treatment prior to progression should continue to be scanned until progression. Kaplan-Meier estimate was used.

Progression Free Survival: Altered Population (Months) in the Global Cohort
Assessed every 8 weeks for the first 2 years following objective disease progression or treatment discontinuation and then every 12 weeks.

Progression free survival (PFS), defined as the time from randomization until progression per RECIST v1.1, as assessed by the investigator at the local site, or death due to any cause.

Progression Free Survival: Altered Population (Percentage) in the Global Cohort
Assessed every 8 weeks for the first 2 years following objective disease progression or treatment discontinuation and then every 12 weeks.

Progression free survival (PFS), defined as the time from randomization until progression per RECIST v1.1, as assessed by the investigator at the local site, or death due to any cause. Kaplan-Meier estimate was used.

Progression Free Survival: Overall Population (Months) in the China Cohort
Assessed every 8 weeks for the first 18 months and every 12 weeks thereafter, from randomization to radiological progression.

Progression free survival (PFS), defined as the time from randomization until progression per RECIST v1.1, as assessed by the investigator at the local site, or death due to any cause, in the global cohort. Progression is defined using Response Evaluation Criteria In Solid Tumors Criteria (RECIST v1.1) as at least a 20% increase in the sum of the longest diameter of target lesions (short axis diameter used for lymph nodes), or clinically significant increase in a non-target lesion, or the appearance of a new lesion(s). Participants who discontinue treatment prior to progression should continue to be scanned until progression.

Progression Free Survival: Overall Population (Percentage) in the China Cohort
Assessed every 8 weeks for the first 18 months and every 12 weeks thereafter, from randomization to radiological progression.

Progression free survival (PFS), defined as the time from randomization until progression per RECIST v1.1, as assessed by the investigator at the local site, or death due to any cause. Progression is defined using Response Evaluation Criteria In Solid Tumors Criteria (RECIST v1.1) as at least a 20% increase in the sum of the longest diameter of target lesions (short axis diameter used for lymph nodes), or clinically significant increase in a non-target lesion, or the appearance of a new lesion(s). Participants who discontinue treatment prior to progression should continue to be scanned until progression. Kaplan-Meier estimate was used.

Progression Free Survival: Altered Population (Months) in the China Cohort
Assessed every 8 weeks for the first 2 years following objective disease progression or treatment discontinuation and then every 12 weeks.

Progression free survival (PFS), defined as the time from randomization until progression per RECIST v1.1, as assessed by the investigator at the local site, or death due to any cause.

Progression Free Survival: Altered Population (Percentage) in the China Cohort
Assessed every 8 weeks for the first 2 years following objective disease progression or treatment discontinuation and then every 12 weeks.

Progression free survival (PFS), defined as the time from randomization until progression per RECIST v1.1, as assessed by the investigator at the local site, or death due to any cause Kaplan-Meier estimate was used.

Overall Survival (OS)
The time from date of randomisation to the date of death due to any cause up to approximately 42 months
Number of patients who experience grade 2 or greater diarrhea as assessed by Common Terminology Criteria for Adverse Events (CTCAE) v4.0
At the eight-week mark from the commencement of the capivasertib treatment in the study

The study aims to evaluate the effectiveness of prophylactic strategies to mitigate diarrhea in patients receiving capivasertib in combination with fulvestrant for hormone receptor-positive (HR+), HER2-negative advanced breast cancer. Toxicities will be graded on the following scale: grade 1 mild, grade 2 moderate, grade 3 severe, grade 4 life threatening/disabling and grade 5 death related to AE.

Number of patients who experience grade 2 or greater rash as assessed by Common Terminology Criteria for Adverse Events (CTCAE) v4.0
At the eight-week mark from the commencement of the capivasertib treatment in the study

The study aims to evaluate the effectiveness of prophylactic strategies to mitigate rash in patients receiving capivasertib in combination with fulvestrant for hormone receptor-positive (HR+), HER2-negative advanced breast cancer. Toxicities will be graded on the following scale: grade 1 mild, grade 2 moderate, grade 3 severe, grade 4 life threatening/disabling and grade 5 death related to AE

To assess complete cell cycle arrest (CCCA).
Up to 14 weeks

The primary endpoint CCCA is defined as Ki67 drop to \<2.7% after approximately 10 weeks (will be assessed centrally on the breast tissue submitted to central pathology)

Objective Response Rate
First dose until progression of disease [PD] or last evaluable assessment in the absence of progression or data cut-off date (21.6 Months)

Objective response rate is defined as the proportion of patients achieving either complete response (CR) or partial response (PR) according to the Lugano 2014 Classification for non-Hodgkin lymphoma (NHL) as assessed by blinded independent central review (BICR).

Phase I: Maximum tolerated dose (MTD) / Recommended phase 2 dose (RP2D).
2 years

Defined as the highest dose level tested at which 0/6 or 1/6 patients experiences dose limiting toxicities (DLT) during course 1 with at least 2 patients experiencing DLT at the next higher dose.

Phase II: Best Overall Response Rate (ORR).
4 years

For patients with leukemia: CR and MRD response after 1 cycle of treatment. This includes determination of CR, CRp, CRi and minimal residual disease (MRD) negativity rate in patients suffering from overt morphological relapse of T-ALL at time of enrolment (morphological disease (M2/M3)), and the MRD negativity rate in those that entered with high-MRD levels but in morphological CR. These results will together be presented as a composite endpoint Overall Response rate (ORR). MRD negativity will be defined as ≤1x10-4 as generated by multi-parameter flow cytometry. For patients with lymphoma: Response in LBL patients is defined as CR, PR, minor response (MR) as defined in International pediatric NHL response criteria. In case of bone-marrow involvement MRD will be taken into account. For patients with lymphoma: Response in LBL patients is defined as CR, PR, minor response (MR) as defined in International pediatric NHL response criteria.

Area under concentration time curve from time 0 to infinity (AUCinf) of dextromethorphan
Period 1: Day 1 to Day 3, Period 2: Day 6 to Day 8

To evaluate the PK (AUCinf) of dextromethorphan when administered orally alone and following oral dosing of capivasertib

Area under concentration curve from time 0 to the last quantifiable concentration (AUClast) of dextromethorphan
Period 1: Day 1 to Day 3, Period 2: Day 6 to Day 8

To evaluate the PK (AUClast) of dextromethorphan when administered orally alone and following oral dosing of capivasertib

Maximum observed drug concentration (Cmax) of dextromethorphan
Period 1: Day 1 to Day 3, Period 2: Day 6 to Day 8

To evaluate the PK (Cmax) of dextromethorphan when administered orally alone and following oral dosing of capivasertib

Area under concentration time curve from zero to infinity (AUCinf)
From Day 1 to Day 4

To compare the PK (AUCinf) of a single oral dose of capivasertib in participants with moderate hepatic impairment to participants with normal hepatic function.

Area under concentration-curve from time 0 to the last quantifiable concentration (AUClast)
From Day 1 to Day 4

To compare the PK (AUClast) of a single oral dose of capivasertib in participants with moderate hepatic impairment to participants with normal hepatic function.

Maximum plasma drug concentration (Cmax)
From Day 1 to Day 4

To compare the PK (Cmax) of a single oral dose of capivasertib in participants with moderate hepatic impairment to participants with normal hepatic function.

Area under concentration-time curve from time 0 to infinity (AUCinf) of rosuvastatin
Period 1: Day 1 to Day 3 and Period 2: Day 1 to Day 3

To evaluate the PK (AUCinf) of rosuvastatin when administered orally alone and in combination with capivasertib.

Area under concentration-curve from time 0 to the last quantifiable concentration (AUClast) of rosuvastatin
Period 1: Day 1 to Day 3 and Period 2: Day 1 to Day 3

To evaluate the PK (AUClast) of rosuvastatin when administered orally alone and in combination with capivasertib.

Maximum observed drug concentration (Cmax) of rosuvastatin
Period 1: Day 1 to Day 3 and Period 2: Day 1 to Day 3

To evaluate the PK (Cmax) of rosuvastatin when administered orally alone and in combination with capivasertib.

Midazolam AUCinf
Cycle 1 Day 1, Cycle 1 Day 2, Cycle 1 Day 8, Cycle 1 Day 9, Cycle 1 Day 12 and Cycle 1 Day 13 (Cycle 1 is 29 days)

Area under the plasma concentration-time curve from zero to infinity

Midazolam Cmax
Cycle 1 Day 1, Cycle 1 Day 2, Cycle 1 Day 8, Cycle 1 Day 9, Cycle 1 Day 12 and Cycle 1 Day 13 (Cycle 1 is 29 days)

Maximum observed plasma (peak) drug concentration

Cmax of Capivasertib
Part 1 and Part 2: From Day 1 to Day 3

Maximum observed plasma (peak) drug concentration (Cmax) of capivasertib when administered alone under fed and fasted conditions, and in combination with acid reducing agent(s) rabeprazole and famotidine (if required).

AUCinf of Capivasertib
Part 1 and Part 2: From Day 1 to Day 3

Area under plasma concentration time curve from zero to infinity (AUCinf) of capivasertib when administered alone under fed and fasted conditions, and in combination with acid reducing agent(s) rabeprazole and famotidine (if required).

AUClast of Capivasertib
Part 1 and Part 2: From Day 1 to Day 3

Area under the plasma concentration curve from zero to the last quantifiable concentration (AUClast) of capivasertib when administered alone under fed and fasted conditions, and in combination with acid reducing agent(s) rabeprazole and famotidine (if required).

Area under the plasma concentration-time curve from time zero to 12 hours post-dose (AUC 0-12) of Capivasertib
first dose up to approximately 6 months

AUC0-12 is defined as area under the curve from 0 to 12 hours.

Maximum plasma concentration (Cmax) of Capivasertib
first dose up to approximately 6 months

Cmax is defined as maximum plasma concentration

terminal half-life (t1/2) of Capivasertib
first dose up to approximately 6 months

t1/2 is defined as terminal half-life

Accumulation ratio (Rac) of Capivasertib
first dose up to approximately 6 months

Rac is defined as accumulation ratio

Area under plasma concentration-time curve from zero to infinity (AUCinf) of capivasertib
Pre-dose and 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 5, 6, 8, 10, 12, 24, 36, and 48 hours after capivasertib dose on Day 1 and Day 6

Assessment of AUCinf of capivasertib.

Maximum observed plasma (peak) drug concentration (Cmax) of capivasertib
Pre-dose and 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 5, 6, 8, 10, 12, 24, 36, and 48 hours after capivasertib dose on Day 1 and Day 6

Assessment of Cmax of capivasertib.

Number of patients with dose limiting toxicity (DLT) for Part A1
Day 1 to day 56 for Part A1

A DLT is defined as an AE that occurs from the first dose of study treatment up to and including the last day of the DLT period (day 1 to day 56 for Part A1) that is assessed as unrelated to the disease, intercurrent illness, or concomitant medications and that, despite optimal therapeutic interventions, meets any of the criteria defined in the protocol.

Number of patients with DLT for Part A2
Day 1 to day 28 for Part A2

A DLT is defined as an AE that occurs from the first dose of study treatment up to and including the last day of the DLT period (day 1 to day 28 for Part A2) that is assessed as unrelated to the disease, intercurrent illness, or concomitant medications and that, despite optimal therapeutic interventions, meets any of the criteria defined in the protocol.

Number of patients with adverse events
For each treatment combination, from screening (Day -28 to -1) either for up to 1.5 years or up to 30 days follow-up period after discontinuation

To investigate the safety and tolerability of capivasertib when given in combination with novel agents (enzalutamide and abiraterone) to patients with metastatic CRPC.

Secondary Endpoints
Number of patients with AEs.
From enrollment up to at least 30 days (+7 days) after last dose of capivasertib + fulvestrant treatment
Time to first Subsequent Chemotherapy (TFSC)
From start of capivasertib+fulvestrant treatment to the first Subsequent Chemotherapy, death, withdrawal of consent or the end of study (approximately 24 months)
Progression-free survival (PFS)
From date of first dose of Capivasertib + fulvestrant until date of disease progression, death, withdrawal of consent or the end of study (approximately 24 months)
Unlock Study Endpoints
Study Design & Arms
AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Capivasertib + fulvestrantEXPERIMENTALFulvestrant: 2 intramuscular injections of 500 mg given on Day 1 of Weeks 1 and 3 of cycle 1, and then on Day 1, Week 1 of each cycle thereafter. Capivasertib: 400 mg (2 oral tablets) BD given on an intermittent weekly dosing schedule. Dosed on Days 1 to 4 in each week of a 28-day treatment cycle.
Cohort 1EXPERIMENTALCapivasertib+Fulvestrant
Cohort 2EXPERIMENTALCapivasertib+Fulvestrant
capivasertib + docetaxelEXPERIMENTALParticipants receive capivasertib in combination with docetaxel and steroids on a background of ADT.
placebo + docetaxelPLACEBO_COMPARATORParticipants receive placebo in combination with docetaxel and steroids on a background of ADT.
Capivasertib Plus Palbociclib and FulvestrantEXPERIMENTALCapivasertib Plus Palbociclib and Fulvestrant (Ph 1b)
Capivasertib Plus Ribociclib and FulvestrantEXPERIMENTALCapivasertib Plus Ribociclib and Fulvestrant (Ph 1b)
Capivasertib Plus Abemaciclib and FulvestrantEXPERIMENTALCapivasertib Plus Abemaciclib and Fulvestrant (Ph 1b)
Capivasertib Plus Fulvestrant and Investigator's choice of CDK4/6i (palbociclib or ribociclib)EXPERIMENTALCapivasertib Plus Fulvestrant and Investigator's choice of CDK4/6i (palbociclib or ribociclib) (Ph III)
Fulvestrant and Investigator's choice of CDK4/6i (palbociclib or ribociclib)ACTIVE_COMPARATORFulvestrant and investigator's choice of CDK4/6i (palbociclib or ribociclib) (Ph III)
Capivasertib + AbirateroneEXPERIMENTALParticipants receive capivasertib in combination with abiraterone (prednisone/prednisolone) on a background of ADT.
Placebo + AbirateronePLACEBO_COMPARATORParticipants receive placebo in combination with abiraterone (prednisone/prednisolone) on a background of ADT.
Placebo + fulvestrantPLACEBO_COMPARATORFulvestrant: 2 intramuscular injections of 500 mg given on Day 1 of Weeks 1 and 3 of cycle 1, and then on Day 1, Week 1 of each cycle thereafter. Placebo: 400 mg (2 oral tablets) BD given on an intermittent weekly dosing schedule. Dosed on Days 1 to 4 in each week of a 28-day treatment cycle.
Capivasertib + PaclitaxelEXPERIMENTALPaclitaxel: Intravenous infusion. 3 consecutive weekly infusions of 80 mg/m2 (given on Day 1 of Weeks 1, 2, and 3), followed by 1 week off-treatment within each 28-day treatment cycle. Capivasertib: Oral tablets. 400 mg of Capivasertib (2 tablets) BD given on an intermittent weekly dosing schedule. Dosed on Days 2 to 5 of Weeks 1, 2, and 3 followed by 1 week off-treatment within each 28-day treatment cycle.
Placebo + PaclitaxelPLACEBO_COMPARATORPaclitaxel: Intravenous infusion. 3 consecutive weekly infusions of 80 mg/m2 (given on Day 1 of Weeks 1, 2, and 3), followed by 1 week off-treatment within each 28-day treatment cycle. Placebo: Oral tablets. 400 mg of Placebo (2 tablets) BD given on an intermittent weekly dosing schedule. Dosed on Days 2 to 5 of Weeks 1, 2, and 3 followed by 1 week off-treatment within each 28-day treatment cycle.
Rash and diarrhea prophylaxisEXPERIMENTALAll participants will receive capivasertib + fulvestrant. Capivasertib will be administered at 400 mg orally, twice daily (BID), on 4-days-on/3-days-off schedule. Fulvestrant will be administered at 500 mg intramuscularly (IM) every 14 days for the first three injections, and every 28 days thereafter. Participants in this arm will take cetirizine 10 mg orally once daily, and loperamide 2 mg orally once daily on capivasertib dosing days, starting on Cycle 1 Day 1 and continued for the first eight weeks (each cycle = 28 days).
Rash prophylaxisEXPERIMENTALAll participants will receive capivasertib + fulvestrant. Capivasertib will be administered at 400 mg orally, twice daily (BID), on 4-days-on/3-days-off schedule. Fulvestrant will be administered at 500 mg intramuscularly (IM) every 14 days for the first three injections, and every 28 days thereafter. Participants will take cetirizine 10 mg orally once daily, starting on Cycle 1 Day 1 and continued for the first eight weeks (each cycle = 28 days).
Arm AEXPERIMENTALCapivasertib (400 mg po twice daily d1-4 followed by 3 days off) for 2 weeks followed by capivasertib (400 mg po twice daily d1-4 followed by 3 days off) and fulvestrant (500 mg i.m. q28d, with an additional 500 mg dose given two weeks after the initial dose) for additional 8 weeks (overall 4 administrations of fulvestrant)
Arm BACTIVE_COMPARATORFulvestrant (500mg i.m. q28d, with an additional 500 mg dose given two weeks after the core biopsy and the initial dose) for 10 weeks (overall 4 administrations)
Capivasertib monotherapyEXPERIMENTALParticipants with R/R FL, R/R MZL, and R/R MCL will receive capivasertib orally until progression of disease (PD) or unacceptable toxicity.
Capivasertib + Venetoclax + DexamethasoneEXPERIMENTALSub-study E: Each cycle lasts 28 days. Cycle 1: All patients in cycle 1 will receive 4 blocks of of capivasertib (days D4-7, 11-14, 18-21, 25-28), 28 days of venetoclax (days 1-28), and one block of seven days of dexamethasone (days 1-7). A 1-day venetoclax ramp-up is proposed in this study. Cycle 2 and subsequent cycles: similar to cycle 1. Patients in dose level -1, receive a lower dose of venetoclax. Patients in dose level 2 receive a higher dose of capivasertib. All patients receive age adapted intrathecal chemotherapy.
Dextromethorphan/ Dextromethorphan + CapivasertibEXPERIMENTALParticipants will receive a single dose of dextromethorphan in Period 1. After a minimum washout period of 4 days from the first dose of dextromethorphan, participants will receive the first dose of capivasertib, followed by a second dose of capivasertib after 12 hours, administered concomitantly with a single dose of dextromethorphan in Period 2.
Test: Capivasertib in Moderate hepatic impairmentEXPERIMENTALParticipants with moderate hepatic impairment will receive a single dose of capivasertib.
Control: Capivasertib in Normal hepatic functionEXPERIMENTALParticipants with normal hepatic function will receive a single dose of capivasertib.
Rosuvastatin/Capivasertib+RosuvastatinEXPERIMENTALParticipants will receive a single dose of rosuvastatin in Period 1. After a minimum washout period of 7 days from the first dose of rosuvastatin, participants will receive the first dose of capivasertib, administered concomitantly with a single dose of rosuvastatin in Period 2, followed by a second dose of capivasertib after 12 hours.
Treatment (Midazolam + Capivasertib)EXPERIMENTALMidazolam will be administered on Cycle 1 Day 1 and Cycle 1 Day 8. Capivasertib will be administrated from Cycle 1 Day 2 as an intermittent schedule (4 days on/3 days off) until discontinuation. On Cycle 1 Day 12, Midazolam will be administrated with Capivasertib.
Treatment ABCEXPERIMENTALParticipants will be randomized to receive oral doses of Treatment A, Treatment B and Treatment C.
Treatment ACBEXPERIMENTALParticipants will be randomized to receive oral doses of Treatment A, Treatment C and Treatment B.
Treatment BACEXPERIMENTALParticipants will be randomized to receive oral doses of Treatment B, Treatment A and Treatment C.
Treatment BCAEXPERIMENTALParticipants will be randomized to receive oral doses of Treatment B, Treatment C and Treatment A.
Treatment CABEXPERIMENTALParticipants will be randomized to receive oral doses of Treatment C, Treatment A and Treatment B.
Treatment CBAEXPERIMENTALParticipants will be randomized to receive oral doses of Treatment C, Treatment B and Treatment A.
Treatment DEFEXPERIMENTALParticipants will be randomized to receive oral doses of Treatment D, Treatment E and Treatment F.
Treatment DFEEXPERIMENTALParticipants will be randomized to receive oral doses of Treatment D, Treatment F and Treatment E.
Treatment EDFEXPERIMENTALParticipants will be randomized to receive oral doses of Treatment E, Treatment D and Treatment F.
Treatment EFDEXPERIMENTALParticipants will be randomized to receive oral doses of Treatment E, Treatment F and Treatment D.
Treatment FDEEXPERIMENTALParticipants will be randomized to receive oral doses of Treatment F, Treatment D and Treatment E.
Treatment FEDEXPERIMENTALParticipants will be randomized to receive oral doses of Treatment F, Treatment E and Treatment D.
capivasertibEXPERIMENTALsingle-dose and multiple-dose capivasertib as monotherapy (Part A) and then in combination with paclitaxel (Part B)
Capivasertib + ItraconazoleEXPERIMENTALSubjects will receive a single oral dose of capivasertib on Day 1 during treatment period 1, itraconazole on Days 3, 4, and 5 during treatment period 2, and single oral dose of capivasertib plus a dose of itraconazole on Day 6, followed by itraconazole alone on Day 7 during treatment period 3.
Part A1: Capivasertib + enzalutamideEXPERIMENTALFrom day 1 to day 28 of this study treatment, patients will continuously enroll on a starting dose of capivasertib in combination with 160 mg enzalutamide.
Part A1: Capivasertib dose level 1 + enzalutamideEXPERIMENTALOn day 29 of the treatment, patients will escalate the capivasertib dose to dose level+1 along with 160 mg enzalutamide.
Part A1: Capivasertib dose level 2 + enzalutamideEXPERIMENTALOn day 29 of the treatment, patients will escalate the capivasertib dose to dose level+2 along with 160 mg enzalutamide.
Part A2: Capivasertib + abirateroneEXPERIMENTALPatients will continuously enroll on a starting dose of capivasertib in combination with 1000 mg abiraterone.
Part B1: Capivasertib + enzalutamideEXPERIMENTALThis optional expansion will treat patients at the recommended dose regimen of capivasertib and enzalutamide.
Part B2: Capivasertib + abirateroneEXPERIMENTALThis optional expansion will treat patients at the recommended dose regimen of capivasertib and abiraterone.
Interventions
NameTypeDescription
FulvestrantDRUG2 intramuscular injections of 500 mg given on Day 1 of Weeks 1 and 3 of cycle 1, and then on Day 1, Week 1 of each cycle thereafter.
CapivasertibDRUG400 mg (2 oral tablets) BD given on an intermittent weekly dosing schedule. Dosed on Days 1 to 4 in each week of a 28-day treatment cycle
docetaxelDRUGPatients will receive docetaxel in intravenous infusion, 75 mg/m2 BSA, on Day 1 of the 21-day cycles for up to 6 to 10 cycles, according to standard of care practices.
placeboOTHERmatched to capivasertib appearance (2 tablets) BD given orally on an intermittent weekly dosing schedule. Patients will be dosed on Days 2 to 5, 9 to 12, and 16 to 19 in each week of a 21-day treatment cycle. Number of Cycles: until disease progression or unacceptable toxicity develops, death, or if the patient requests to stop the study treatment.
PalbociclibDRUGPhase Ib: 100 mg/ 125 mg. Once daily for 21 consecutive days followed by 7 days off treatment to comprise a complete 28-day cycle Phase III: Administered once daily for 21 days of 28-day cycle, at the dose of 125 mg.
RibociclibDRUGPhase Ib: 200 mg/ 400 mg/ 600 mg. Once daily for 21 consecutive days followed by 7 days off treatment to comprise a complete 28-day cycle Phase III: Administered once daily for 21 days of 28-day cycle, at the dose confirmed in the phase 1b portion.
AbemaciclibDRUGPhase Ib: 50 mg/ 100 mg/ 150 mg. Twice daily for 28 consecutive days to comprise a complete 28-day cycle
Abiraterone AcetateDRUGAdministered orally as tablets at a dosage of 1000 mg daily. Administered continuously until criteria for discontinuation are met.
PaclitaxelDRUG80 mg/m2 concentrate for solution for infusion, 3 consecutive weekly infusions of 80 mg/m2 (given on Day 1 of Weeks 1, 2, and 3), followed by 1 week off-treatment within each 28-day treatment cycle. Paclitaxel treatment will be continued for at least 6 cycles unless the patient experiences unacceptable toxicity that is attributed directly to treatment with paclitaxel.
LoperamideDRUG2 mg orally once daily on capivasertib dosing days
CeterizineDRUG10 mg orally once a day, starting on Cycle 1 Day 1 and continued for the first eight weeks (each cycle=28 days)
Fulvestrant injectionDRUGfind arm B description
VenetoclaxDRUGOral
DexamethasoneDEVICEoral/intravenous
Intrathecal chemotherapyDRUGIT: Methotrexate +/- prednisone/hydrocortisone/cytarabine according to the degree of central nervous involvement
DextromethorphanDRUGDextromethorphan will be administered orally once in Period 1 and once in Period 2
RosuvastatinDRUGRosuvastatin will be administered orally once in both Period 1 and Period 2.
MidazolamDRUGSingle doses of midazolam (syrup, 1 mg) will be given on cycle 1 Days 1, 8, and 12.
RabeprazoleDRUGParticipants will receive twice daily oral doses of rabeprazole for 3 days (Days -3 to -1) and a single dose on the morning of Day 1 for Treatment C.
ItraconazoleDRUGSubjects will be administered itraconazole twice daily on Day 3, followed by once daily doses in the morning for 4 days.
EnzalutamideDRUGPatients will receive 160 mg oral dose of enzalutamide.
AbirateroneDRUGPatients will receive 1000 mg oral dose of abiraterone.
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Eligibility Criteria
Age Range18 Years to 130 Years
SexALL
Healthy VolunteersNo
Study Sites17

Key Inclusion Criteria Histologically confirmed HR+/HER2- breast cancer (primary or metastatic): * HR+ defined as ER+ with or without PRg+ * HER2- defined as IHC 0 or 1+, or IHC 2+/ISH- Patient with tumours harbouring at least one PIK3CA/AKT1/PTEN qualifying alteration detected by a validated tes...

Countries:SpainChinaUnited StatesAustraliaBelgiumBrazilCanadaChileCzechiaFranceGreeceHungaryIndiaIsraelJapanMexicoNetherlandsPolandSouth KoreaTaiwanTurkey (Türkiye)United KingdomArgentinaDenmarkGermanyItalyMalaysiaSwedenThailandVietnamAustriaBulgariaHong KongPeruPhilippinesRussiaSlovakiaSouth AfricaColombiaPortugalSaudi Arabia
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Recent Changes (Last 90 Days)
LOWJul 6, 2026NCT06764186lastUpdatePostDate: changed
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