A Phase 3 interventional study of Veliparib Placebo and Veliparib in Metastatic Breast Cancer, sponsored by AbbVie. Completed at 219 sites in 37 countries. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2025-02-19.
Sponsored by AbbVie · Phase 3, Interventional, and Treatment
The primary objective of the study is to assess the progression-free survival (PFS) of veliparib in combination with carboplatin and paclitaxel (C/P) compared to placebo plus C/P in participants with a Breast Cancer Gene 1 or 2 (BRCA1; BRCA2) mutation in Human Epidermal Growth Factor Receptor 2 (HER2)-negative metastatic or locally advanced unresectable breast cancer. The secondary objectives of the study are to assess overall survival (OS), clinical benefit rate (CBR) through the end of Week 24, objective response rate (ORR) and PFS on subsequent therapy (PFS2) in participants treated with veliparib in combination with C/P versus placebo in combination with C/P.
This is a Phase 3, randomized, double-blind, multinational, multicenter study to evaluate the efficacy and tolerability of veliparib in combination with C/P compared to placebo in combination with C/P in participants with a BRCA1 or BRCA2 mutation, as documented by the Sponsor core laboratory, with HER2-negative metastatic or locally advanced unresectable breast cancer who received no more than 2 prior lines of cytotoxic therapy for metastatic disease. For the purposes of eligibility, HER2-negative status was based on the most recent tumor biopsy. Participants were randomized in a 2:1 ratio, with a total of approximately 500 participants planned to be randomized. Veliparib 120 mg/placebo twice a day (BID) was dosed Days -2 through 5 with carboplatin target area under the concentration-time curve (AUC) 6 administered on Day 1 and paclitaxel 80 mg/m2 administered weekly on Days 1, 8, and 15 of each 21-day cycle.
Safety and efficacy data through the prespecified primary analysis cutoff date of 05 April 2019 are included in the interim analysis.
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Exclusion Criteria:
More than two prior lines of cytotoxic chemotherapy (e.g., gemcitabine, doxorubicin, capecitabine) for metastatic disease.
Prior taxane therapy administered for the treatment of metastatic breast cancer with the below exceptions.
Placebo capsules for veliparib (120 mg) administered by mouth twice daily (BID) on Days -2 through 5 of a 21-day cycle. Carboplatin administered intravenously over approximately 15 to 30 minutes at AUC 6 mg/ml/min immediately following paclitaxel infusion on Day 1 of every cycle. Paclitaxel administered intravenously over approximately 1 hour at a dose of 80 mg/m² on Days 1, 8, and 15 of every cycle.
Drug: Veliparib Placebo · Drug: Carboplatin · Drug: Paclitaxel
Veliparib capsules (120 mg) administered by mouth twice daily (BID) on Days -2 through 5 of a 21-day cycle. Carboplatin administered intravenously over approximately 15 to 30 minutes at AUC 6 mg/ml/min immediately following paclitaxel infusion on Day 1 of every cycle. Paclitaxel administered intravenously over approximately 1 hour at a dose of 80 mg/m² on Days 1, 8, and 15 of every cycle.
Drug: Veliparib · Drug: Carboplatin · Drug: Paclitaxel
Supplied as 40 mg, 50 mg, or 100 mg capsules for oral administration twice daily (BID) on Days -2 through 5 of a 21-day cycle.
Supplied as 40 mg, 50 mg, or 100 mg capsules for oral administration twice daily (BID) on Days -2 through 5 of a 21-day cycle.
Also known as: ABT-888
Administered intravenously over approximately 15 to 30 minutes at an area under the curve (AUC) of 6 mg/mL/min immediately following paclitaxel infusion on Day 1 of every cycle. The duration of carboplatin infusion may be lengthened according to institutional guidelines.
Administered by intravenous infusion over approximately 1 hour at a dose of 80 mg/m² of body-surface area (BSA) on Days 1, 8, and 15 of each 21-day cycle. Paclitaxel is to be infused prior to carboplatin on Day 1. Dosing of veliparib/placebo is to be completed before the carboplatin or paclitaxel infusions.
Progression-Free Survival (PFS)
Time to PFS is defined as the number of days from the date the participant was randomized to the date the participant experiences radiographic disease progression (as determined by the investigators), or to the date of death (all causes of mortality) if disease progression is not reached. All events of disease progression occurring on or before the Primary Analysis Cutoff date of 05 April 2019 were to be included, regardless of whether the event occurred while the participant was still taking study drug or had previously discontinued study drug. PFS was estimated for each treatment group using Kaplan-Meier methodology.
Time frame: From randomization until the primary analysis data cut-off date of 05 April 2019; the median duration of follow-up was 35.5 months
Overall Survival (OS)
Time to death (overall survival) is defined as the number of days from the date the participant was randomized to the date of the participant's death. All events of death which occur up to the analysis cutoff date are to be included, regardless of whether the event occurred while the participant was still taking study drug or after the participant discontinued study drug. If a participant has not died, the data for the participant is to be censored at the date last known to be alive or at the analysis cutoff date if that is earlier. The final analysis of OS will occur when the pre-specified number of events has occurred in the ITT population.
Time frame: Up to 84.5 and 81.8 months for Placebo and Veliparib, respectively.
Clinical Benefit Rate (CBR)
The clinical benefit rate (CBR) is defined as the progression-free rate at 24 weeks (168 days), estimated using Kaplan Meier methodology. All events of disease progression in the primary progression free survival analysis database were to be included, regardless of whether the event occurred while the participant was still taking, or had previously discontinued, study drug. If the participant had not yet progressed then their data was to be censored at the date of the last evaluable disease progression assessment. Participants without post-baseline assessments were to be censored at the date of randomization.
Time frame: Through the end of Week 24
Objective Response Rate (ORR)
The objective response rate (ORR) is calculated as the percentage of participants who have a confirmed partial response (PR) or complete response (CR) based on assessment by the investigators per Response Evaluation Criteria In Solid Tumors (RECIST) criteria version 1.1. All participants who had at least one measurable lesion at baseline were to be included in the ORR calculation. The final analysis of ORR will occur when the pre-specified number of Overall Survival events have occurred in the ITT population, per the fixed sequence testing procedure.
Time frame: Approximately 8 years from randomization
Progression-Free Survival on Subsequent Therapy (PFS2)
PFS2 is defined as the number of days from the date of randomization to the time of disease progression on subsequent therapy or death from any cause. The distribution of PFS2 was to be estimated for each treatment group using Kaplan-Meier methodology. The final analysis of PFS2 will occur when the pre-specified number of Overall Survival events have occurred in the ITT population, per the fixed sequence testing procedure.
Time frame: Approximately 8 years from randomization
A total of 513 subjects enrolled in the study (N=174 to the placebo + C/P arm, and N=339 to the veliparib + C/P arm). Two subjects form each arm (N= 4) were determined not to have a suspected deleterious or deleterious mutation in BRCA1/2 and were excluded from the ITT population \[ITT Population (N=509); Placebo + C/P arm (N=172), and Veliparib + C/P arm (N=337)\]. Of the 4 subjects, 3 subjects received treatment and later discontinued due to disease progression.
| Milestone | Placebo + C/P | Veliparib + C/P |
|---|---|---|
| Started | 174 | 339 |
| Itt population | 172 | 337 |
| Completed | 0 | 0 |
| Not completed | 174 | 339 |
| Withdrew: Adverse event- related to progression | 4 | 10 |
| Withdrew: Adverse event- not related to progression | 7 | 22 |
| Withdrew: Withdrew consent | 13 | 28 |
| Withdrew: Lost to follow-up | 2 | 2 |
| Withdrew: Sponsor discontinued study | 3 | 29 |
| Withdrew: Progressive disease per protocol | 125 | 224 |
| Withdrew: Other, not specified | 17 | 22 |
| Withdrew: Randomized but not treated | 1 | 0 |
| Withdrew: Determined not to have a suspected deleterious or deleterious mutation in brca1/2 | 2 | 2 |
Time to PFS is defined as the number of days from the date the participant was randomized to the date the participant experiences radiographic disease progression (as determined by the investigators), or to the date of death (all causes of mortality) if disease progression is not reached. All events of disease progression occurring on or before the Primary Analysis Cutoff date of 05 April 2019 were to be included, regardless of whether the event occurred while the participant was still taking study drug or had previously discontinued study drug. PFS was estimated for each treatment group using Kaplan-Meier methodology.
| months | Placebo + C/P | Veliparib + C/P |
|---|---|---|
| Progression-Free Survival (PFS) | 12.6 (10.6 to 14.4) | 14.6 (12.5 to 17.7) |
Time to death (overall survival) is defined as the number of days from the date the participant was randomized to the date of the participant's death. All events of death which occur up to the analysis cutoff date are to be included, regardless of whether the event occurred while the participant was still taking study drug or after the participant discontinued study drug. If a participant has not died, the data for the participant is to be censored at the date last known to be alive or at the analysis cutoff date if that is earlier. The final analysis of OS will occur when the pre-specified number of events has occurred in the ITT population.
| months | Placebo + C/P | Veliparib + C/P |
|---|---|---|
| Overall Survival (OS) | 28.2 (24.7 to 32.8) | 32.4 (27.4 to 38.1) |
The clinical benefit rate (CBR) is defined as the progression-free rate at 24 weeks (168 days), estimated using Kaplan Meier methodology. All events of disease progression in the primary progression free survival analysis database were to be included, regardless of whether the event occurred while the participant was still taking, or had previously discontinued, study drug. If the participant had not yet progressed then their data was to be censored at the date of the last evaluable disease progression assessment. Participants without post-baseline assessments were to be censored at the date of randomization.
| percentage of participants | Placebo + C/P | Veliparib + C/P |
|---|---|---|
| Clinical Benefit Rate (CBR) | 93.2 (89.5 to 95.7) | 90.7 (87.9 to 92.9) |
The objective response rate (ORR) is calculated as the percentage of participants who have a confirmed partial response (PR) or complete response (CR) based on assessment by the investigators per Response Evaluation Criteria In Solid Tumors (RECIST) criteria version 1.1. All participants who had at least one measurable lesion at baseline were to be included in the ORR calculation. The final analysis of ORR will occur when the pre-specified number of Overall Survival events have occurred in the ITT population, per the fixed sequence testing procedure.
| percentage of participants | Placebo + C/P | Veliparib + C/P |
|---|---|---|
| Objective Response Rate (ORR) | 74.1 (66.1 to 81.1) | 75.8 (70.4 to 80.6) |
PFS2 is defined as the number of days from the date of randomization to the time of disease progression on subsequent therapy or death from any cause. The distribution of PFS2 was to be estimated for each treatment group using Kaplan-Meier methodology. The final analysis of PFS2 will occur when the pre-specified number of Overall Survival events have occurred in the ITT population, per the fixed sequence testing procedure.
| months | Placebo + C/P | Veliparib + C/P |
|---|---|---|
| Progression-Free Survival on Subsequent Therapy (PFS2) | 17.4 (16.0 to 20.7) | 21.5 (19.9 to 25.3) |
Collected over All-cause mortality were reported from enrollment to the end of study, median time on follow up was 84.5 and 81.8 months for Placebo + C/P and Veliparib + C/P, respectively. Treatment-emergent adverse events and serious adverse events were collected from first dose of study drug until 30 days after the last dose of study drug; mean duration on study drug was 115.0 and 117.5 days for Placebo + C/P and Veliparib + C/P, respectively.. Non-serious events are listed at a 5% frequency threshold.
| Group | Deaths | Serious | Other |
|---|---|---|---|
| Placebo + C/P | 129/174 (74.1%) | 68/174 (39.1%) | 169/174 (97.1%) |
| Veliparib + C/P | 244/339 (72%) | 135/339 (39.8%) | 332/339 (97.9%) |
| Event | Placebo + C/P | Veliparib + C/P |
|---|---|---|
| MALIGNANT NEOPLASM PROGRESSIONNeoplasms benign, malignant and unspecified (incl cysts and polyps) | 11/174 | 19/339 |
| ANAEMIABlood and lymphatic system disorders | 5/174 | 16/339 |
| THROMBOCYTOPENIABlood and lymphatic system disorders | 5/174 | 14/339 |
| FEBRILE NEUTROPENIABlood and lymphatic system disorders | 3/174 | 11/339 |
| PYREXIAGeneral disorders | 4/174 | 9/339 |
| NEUTROPENIABlood and lymphatic system disorders | 0/174 | 8/339 |
| SEPSISInfections and infestations | 4/174 | 4/339 |
| METASTASES TO CENTRAL NERVOUS SYSTEMNeoplasms benign, malignant and unspecified (incl cysts and polyps) | 4/174 | 1/339 |
| PNEUMONIAInfections and infestations | 2/174 | 7/339 |
| NAUSEAGastrointestinal disorders | 2/174 | 6/339 |
| Event | Placebo + C/P | Veliparib + C/P |
|---|---|---|
| NEUTROPENIABlood and lymphatic system disorders | 156/174 | 292/339 |
| THROMBOCYTOPENIABlood and lymphatic system disorders | 118/174 | 257/339 |
| ANAEMIABlood and lymphatic system disorders | 117/174 | 256/339 |
| NAUSEAGastrointestinal disorders | 118/174 | 240/339 |
| ALOPECIASkin and subcutaneous tissue disorders | 87/174 | 182/339 |
| FATIGUEGeneral disorders | 90/174 | 168/339 |
| PERIPHERAL SENSORY NEUROPATHYNervous system disorders | 89/174 | 158/339 |
| DIARRHOEAGastrointestinal disorders | 69/174 | 151/339 |
| VOMITINGGastrointestinal disorders | 72/174 | 118/339 |
| LEUKOPENIABlood and lymphatic system disorders | 65/174 | 133/339 |
| Age, Continuous(years) | Placebo + C/P | Veliparib + C/P | Total |
|---|---|---|---|
| Mean | 46.8 ± 10.81 | 46.8 ± 10.73 | 46.8 ± 10.75 |
| Sex: Female, Male(Participants) | Placebo + C/P | Veliparib + C/P | Total |
|---|---|---|---|
| Female | 169 | 333 | 502 |
| Male | 3 | 4 | 7 |
| Race/Ethnicity, Customized(Participants) | Placebo + C/P | Veliparib + C/P | Total |
|---|---|---|---|
| White | 153 | 294 | 447 |
| Black or African American | 6 | 14 | 20 |
| Asian | 12 | 24 | 36 |
| American Indian or Alaska Native | 0 | 3 | 3 |
| Native Hawaiian or Pacific Islander | 0 | 0 | 0 |
| Multiple | 1 | 2 | 3 |
Showing the first 100 of 219 sites across 37 countries.
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Plan to share: Yes — AbbVie is committed to responsible data sharing regarding the clinical trials we sponsor. This includes access to anonymized, individual and trial-level data (analysis data sets), as well as other information (e.g., protocols and clinical study reports), as long as the trials are not part of an ongoing or planned regulatory submission. This includes requests for clinical trial data for unlicensed products and indications.
Supporting information: Study protocol, Sap, Csr
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