A Phase 1 Study Of Talazoparib, PARP Inhibitor, In Japanese Patients With Advanced Solid Tumors

Neoplasms Clinical Trial

Official title:

A PHASE 1 STUDY OF THE SAFETY, PHARMACOKINETICS AND ANTI-TUMOR ACTIVITY OF TALAZOPARIB, POLY (ADP-RIBOSE) POLYMERASE (PARP) INHIBITOR, IN JAPANESE PATIENTS WITH ADVANCED SOLID TUMORS

Clinical Trial Details — Status: Active, not recruiting

Administrative data

• NCT number: NCT03343054
• Other study ID #: C3441030
• Status: Active, not recruiting
• Phase: Phase 1
• Start date: November 30, 2017
• Est. completion date: August 31, 2024

Study information

• Verified date: September 2023
• Source: Pfizer
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

This is a Phase 1 study which consists of 2 parts; Dose Escalation part and Expansion part. The dose escalation part is open-label, and evaluates safety, preliminary efficacy and PK of single-agent talazoparib in sequential cohorts of adult patients with advanced solid tumors who are resistant to standard therapy or for whom no standard therapy is available. In the dose escalation part, up to 18 (minimum 3) patients are expected to be enrolled depending on the observed DLTs. The expansion part is designed to assess the efficacy, safety and PK of single-agent talazoparib at RP2D determined in the dose escalation part in adult patients with locally advanced or metastatic breast cancer who have deleterious or suspected deleterious germline BRCA1 or BRCA2 mutations. In the expansion part, a minimum of 17 patients will be enrolled evaluable for the primary endpoint.

Recruitment information / eligibility

• Status: Active, not recruiting
• Enrollment: 28
• Est. completion date: August 31, 2024
• Est. primary completion date: January 11, 2021
• Accepts healthy volunteers: No
• Gender: All
• Age group: 20 Years and older

Eligibility

[Dose Escalation Part]

Inclusion Criteria:

• Histological or cytological diagnosis of locally advanced or metastatic solid tumor that is resistant to standard therapy or for which no standard therapy is available.
• ECOG Performance Status 0 or 1.
• Adequate Bone Marrow, Renal and Liver Function.

Exclusion Criteria:

• Patients with known symptomatic brain metastases requiring steroids.
• Current use of a strong P-gp inhibitor, strong P-gp inducer, or strong inhibitor of BCRP within 1 week or 5 half lives which ever is longer prior to the first dose of study treatment.
• Fertile male patients and female patients of childbearing potential who are unwilling or unable to use 2 highly effective methods of contraception. [Dose Expansion Part]

Inclusion Criteria:

• Histologically or cytologically confirmed carcinoma of the breast.
• Locally advanced breast cancer that is not amenable to curative radiation or surgery and/or metastatic disease.
• Documentation of a deleterious, suspected deleterious, or pathogenic germline BRCA1 or BRCA2 mutation by Myriad Genetics' BRACAnalysis CDx test.
• No more than 3 prior chemotherapy-inclusive regimens for locally advanced or metastatic disease.
• Have measurable lesion by the RECIST v.1.1.
• ECOG Performance Status 0-2.
• Adequate Bone Marrow, Renal and Liver Function.

Exclusion Criteria:

• First-line locally advanced or metastatic breast cancer with no prior neoadjuvant and adjuvant chemotherapy.
• Prior treatment with a PARP inhibitor.
• Objective disease progression while receiving platinum chemotherapy administered for locally advanced or metastatic disease.
• HER2 positive breast cancer.
• Active inflammatory breast cancer.
• Central nervous system (CNS) metastases.
• Current or anticipated use within 7 days prior to the first dose of study treatment, or anticipated use during the study of strong P-gp inhibitors.
• Fertile male patients and female patients of childbearing potential who are unwilling or unable to use 2 highly effective methods of contraception.

Related Conditions & MeSH terms

• Breast Neoplasms
• Neoplasms

Intervention

Drug:
• talazoparib
Talazoparib will be administered orally on a continuous basis. Talazoparib may be taken with or without food. Each cycle will consist of 28 days.

Locations

Country	Name	City	State
Japan	National Cancer Center Hospital	Chuo-Ku	Tokyo
Japan	Hakuaikai Medical Corporation Sagara Hospital	Kagoshima
Japan	National Cancer Center Hospital East	Kashiwa	Chiba
Japan	Saitama Cancer Center	Kitaadachi-gun	Saitama
Japan	Aichi Cancer Center Hospital	Nagoya	Aichi
Japan	National Hospital Organization Osaka National Hospital	Osaka
Japan	National Hospital Organization Hokkaido Cancer Center	Sapporo	Hokkaido
Japan	Kanagawa Cancer Center	Yokohama	Kanagawa

Sponsors (1)

Lead Sponsor	Collaborator
Pfizer

Country where clinical trial is conducted

Japan, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Dose Escalation: Number of Participants With Dose-Limiting Toxicities (DLT)	DLT was defined as any of the following adverse events occurred in 1st treatment cycle and attributable to talazoparib: hematologic- grade(G) 4 neutropenia greater than (>)7days; Febrile neutropenia >1 hour; G greater than or equal to (>=)3 neutropenic infection, thrombocytopenia associated with G2 hemorrhage; G4 thrombocytopenia, anemia; G3 anemia required transfusion; daily dosing interrupted for >=7 total days in first cycle for G3 neutropenia/thrombocytopenia. Non-hematologic: any G>=3AE except non-clinically significant laboratory abnormalities, Non-hematologic AE deemed not clinically significant, nausea, vomiting, diarrhea responded to medical intervention within 72 hours, fatigue improved to G>=2 within 7 days. Alanine/aspartate aminotransferase (ALT/AST)>5*upper limit of normal(ULN) and 2*increases above baseline values; ALT/AST>=3*ULN concurrent with total bilirubin (TB)>2*ULN; TB>5*ULN; failure to deliver 75percent(%) of doses due to toxicities attributable to talazoparib.	Cycle 1 (28 days)
Primary	Dose Expansion: Percentage of Participants With Confirmed Objective Response (OR) Per Response Evaluation Criteria in Solid Tumors (RECIST) Version (v) 1.1 by Investigator Assessment	Confirmed OR in participants was defined as the percentage of participants with complete response (CR) or partial response (PR) as best response determined by investigator as per RECIST v 1.1 and confirmed by a second image at least 4 weeks from the initial imaging showing response. As per RECIST v 1.1, CR was defined as disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to less than (<)10 millimeters (mm). PR was defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters.	From start of the treatment until disease progression or death (due to any cause) whichever occurred first (maximum duration: up to 502 days)
Secondary	Number of Participants With Treatment Emergent Adverse Events (TEAE) Based on National Cancer Institute Common Toxicity Criteria for Adverse Events (NCI CTCAE) Version 4.03	Adverse event (AE) was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. Serious adverse event was the AE resulting in any of following outcomes/deemed significant for any other reason: death; initial /prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly. TEAEs were the events between first dose of study drug and up to 30 days after last dose or before start of new anticancer therapy, whichever occurred first. TEAE graded by CTCAE v 4.03 as Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening; Grade 5 = death.	From start of the treatment up to 30 days after last dose or start of new anticancer therapy, whichever occurred first (Dose escalation: maximum duration- up to 286 days; Dose expansion: maximum duration- up to 502 days)
Secondary	Number of Participants With Treatment Related Adverse Events Based on National Cancer Institute Common Toxicity Criteria for Adverse Events (NCI CTCAE) Version 4.03	A treatment-related AE was any untoward medical occurrence attributed to the study drug in a participant who received study drug. Serious adverse event was the AE resulting in any of following outcomes/deemed significant for any other reason: death; initial /prolonged inpatient hospitalization; life-threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly. TEAEs were the events between first dose of study drug and up to 30 days after last dose or before start of new anticancer therapy, whichever occurred first. AE graded by CTCAE v 4.03 as Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening; Grade 5 = death. Relatedness to study drug was assessed by the investigator.	From start of the treatment up to 30 days after last dose or start of new anticancer therapy, whichever occurred first (Dose escalation: maximum duration- up to 286 days; Dose expansion: maximum duration- up to 502 days)
Secondary	Number of Participants With Grade 3 or Higher Treatment-Emergent Adverse Events (AEs) Based on National Cancer Institute Common Toxicity Criteria for Adverse Events (NCI CTCAE) Version 4.03	AE was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. TEAEs were the events between first dose of study drug and up to 30 days after last dose or before start of new anticancer therapy, whichever occurred first. TEAE graded by CTCAE v 4.03 as Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening; Grade 5 = death. In this outcome measure, number of participants with grade 3 or higher AEs were reported.	From start of the treatment up to 30 days after last dose or start of new anticancer therapy, whichever occurred first (Dose escalation: maximum duration- up to 286 days; Dose expansion: maximum duration- up to 502 days)
Secondary	Number of Participants With Laboratory Abnormalities Based on National Cancer Institute Common Toxicity Criteria for Adverse Events (NCI CTCAE) Version 4.03: Chemistry	Parameters: Alanine aminotransferase increased, alkaline phosphatase increased, aspartate aminotransferase increased, blood bilirubin increased, creatinine increased, hypercalcemia, hyperglycemia, hyperkalemia, hypermagnesemia, hypernatremia, hypoalbuminemia, hypocalcemia, hypoglycemia, hypokalemia, hypomagnesemia, hyponatremia, hypophosphatemia. As per CTCAE v 4.03: Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening. Only those categories in which at least one participant had data were reported in this outcome measure.	Dose escalation: Baseline up to 286 days; Dose expansion: Baseline up to 502 days
Secondary	Number of Participants With Laboratory Abnormalities Based on National Cancer Institute Common Toxicity Criteria for Adverse Events (NCI CTCAE) Version 4.03: Hematology	Hematological parameters included: Anemia, Hemoglobin increased, Lymphocyte count decreased, Lymphocyte count increased, Neutrophil count decreased, Platelet count decreased, White blood cell decreased. As per CTCAE v 4.03: Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening. Only those categories in which at least one participant had data were reported in this outcome measure.	Dose escalation: Baseline up to 286 days; Dose expansion: Baseline up to 502 days
Secondary	Dose Escalation: Number of Participants With Abnormalities in Vital Signs	Vital sign abnormalities: a) Sitting systolic blood pressure: <90 millimeter of mercury (mmHg), decrease from baseline >=30 mmHg, increase from baseline >=30 mmHg; b) Sitting diastolic blood pressure: minimum <50 mmHg, decrease from baseline >=20 mmHg, increase from baseline >=20 mmHg; c) Sitting pulse rate: minimum <40 beats per minute (bpm), maximum >120 bpm. Only those categories in which at least one participant had data were reported in this outcome measure.	Baseline up to 286 days
Secondary	Dose Escalation- Single Dose: Maximum Observed Plasma Concentration (Cmax) for Talazoparib	Cmax was defined as the maximum observed plasma concentration of talazoparib.	Pre dose, 0.50, 0.75, 1, 2, 3, 4, 6, 8, 10, 24, 48, 72 and 96 hours post dose on Day -7 of Cycle 1
Secondary	Dose Escalation- Single Dose: Time to Reach Maximum Observed Plasma Concentration (Tmax) for Talazoparib	Tmax was defined as the time to reach maximum observed plasma concentration of talazoparib.	Pre dose, 0.50, 0.75, 1, 2, 3, 4, 6, 8, 10, 24, 48, 72 and 96 hours post dose on Day -7 of Cycle 1
Secondary	Dose Escalation- Single Dose: Area Under the Curve From Time Zero to Last Quantifiable Concentration (AUClast) for Talazoparib	Area under the plasma concentration time-curve from time zero to the time of last measured concentration (AUClast).	Pre dose, 0.50, 0.75, 1, 2, 3, 4, 6, 8, 10, 24, 48, 72 and 96 hours post dose on Day -7 of Cycle 1
Secondary	Dose Escalation- Single Dose: Area Under the Curve From Time Zero to Time Tau (AUCtau) for Talazoparib	Area under the plasma concentration curve from time 0 to end of dosing interval (AUCtau), where dosing interval was 24 hours.	Pre dose, 0.50, 0.75, 1, 2, 3, 4, 6, 8, 10 and 24 hours post dose on Day -7 of Cycle 1
Secondary	Dose Escalation- Single Dose: Apparent Oral Clearance of Talazoparib (CL/F)	Clearance is a measure of the rate at which a drug was metabolized or eliminated by normal biological processes.	Pre dose, 0.50, 0.75, 1, 2, 3, 4, 6, 8, 10, 24, 48, 72 and 96 hours post dose on Day -7 of Cycle 1
Secondary	Dose Escalation- Single Dose: Apparent Volume of Distribution (Vz/F) for Talazoparib	Volume of distribution is defined as the theoretical volume in which the total amount of drug would need to be uniformly distributed to produce the desired plasma concentration of a drug.	Pre dose, 0.50, 0.75, 1, 2, 3, 4, 6, 8, 10, 24, 48, 72 and 96 hours post dose on Day -7 of Cycle 1
Secondary	Dose Escalation- Single Dose: Terminal Half-Life (t1/2) for Talazoparib	Terminal half-life (t1/2) is the time measured for the plasma concentration of a drug to decrease by half of its initial concentration.	Pre dose, 0.50, 0.75, 1, 2, 3, 4, 6, 8, 10, 24, 48, 72 and 96 hours post dose on Day -7 of Cycle 1
Secondary	Dose Escalation- Single Dose: Area Under the Curve From Time Zero to Extrapolated Infinite Time (AUCinf) for Talazoparib	AUCinf = Area under the plasma concentration versus time curve (AUC) from time zero (pre dose) to extrapolated infinite time (0-inf).	Pre dose, 0.50, 0.75, 1, 2, 3, 4, 6, 8, 10, 24, 48, 72 and 96 hours post dose on Day -7 of Cycle 1
Secondary	Dose Escalation- Multiple Dose: Maximum Observed Plasma Concentration at Steady State (Css,Max) for Talazoparib	Css,max is maximum observed plasma concentration at steady state (post multiple dose) of Talazoparib.	Pre dose, 0.50, 0.75, 1, 2, 3, 4, 6, 8, 10 and 24 hours post dose on Day 22 of Cycle 1
Secondary	Dose Escalation- Multiple Dose: Predose Concentration (Cmin) for Talazoparib	Pre dose plasma concentration of talazoparib.	Pre dose on Day 22 of Cycle 1
Secondary	Dose Escalation- Multiple Dose: Time for Maximum Observed Plasma Concentration at Steady State (Tss,Max) for Talazoparib	Tss,max = Time to reach Cmax for talazoparib at steady state (post multiple dose).	Pre dose, 0.50, 0.75, 1, 2, 3, 4, 6, 8, 10 and 24 hours post dose on Day 22 of Cycle 1
Secondary	Dose Escalation- Multiple Dose: Area Under the Curve From Time Zero to Time Tau at Steady State (AUCss,Tau) for Talazoparib	Area under the plasma concentration curve from time 0 to end of dosing interval (AUCtau) at steady state (post multiple dose), where dosing interval was 24 hours.	Pre dose, 0.50, 0.75, 1, 2, 3, 4, 6, 8, 10 and 24 hours post dose on Day 22 of Cycle 1
Secondary	Dose Escalation- Multiple Dose: Apparent Oral Clearance of Talazoparib at Steady State (CL/Fss)	Clearance is a measure of the rate at which a drug was metabolized or eliminated by normal biological processes.	Pre dose, 0.50, 0.75, 1, 2, 3, 4, 6, 8, 10 and 24 hours post dose on Day 22 of Cycle 1
Secondary	Dose Escalation- Multiple Dose: Accumulation Ratio (Rac) of AUCtau for Talazoparib	Accumulation ratio for AUC was calculated as AUCtau for Day 22 divided by AUCtau for Day -7, where AUCtau was defined as area under the plasma concentration curve from time 0 to end of dosing interval, where dosing interval was 24 hours.	Pre dose, 0.5, 0.75, 1, 2, 4, 6, 8, 10 and 24 hours post dose on Day -7 and Day 22 of Cycle 1
Secondary	Dose Escalation- Multiple Dose: Linearity Ratio (Rss) of AUC for Talazoparib	Rss was calculated by dividing AUCtau at steady state (post multiple dosing on Day 22) by single dose AUCinf (on Day -7). AUCtau was defined as area under the plasma concentration curve from time 0 to end of dosing interval, where dosing interval was 24 hours. AUCinf was defined as area under the plasma concentration versus time curve (AUC) from time zero (pre-dose) to extrapolated infinite time (0-inf).	Pre dose, 0.50, 0.75, 1, 2, 3, 4, 6, 8, 10, 24, 48, 72 and 96 hours post dose on Day -7 of Cycle 1; Pre dose, 0.5, 0.75, 1, 2, 4, 6, 8, 10 and 24 hours post dose on Day 22 of Cycle 1
Secondary	Dose Escalation: Percentage of Participants With Objective Response (OR) Per Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.1	OR in participants was defined as the percentage of participants with CR or PR as best response determined by investigator as per RECIST v 1.1. As per RECIST v 1.1, CR was defined as disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to <10 mm. PR was defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters.	From start of the treatment until disease progression or death (due to any cause) whichever occurred first (maximum duration: up to 286 days)
Secondary	Dose Escalation: Progression Free Survival (PFS)	PFS was defined as the time from the date of first dose of study drug to the earliest date of disease progression per RECIST v 1.1, or death due to any cause, whichever occurs first. PD = at least a 20% increase in the sum of diameters of measured lesions taking as references the smallest sum of diameters recorded on study (including baseline) and an absolute increase of >=5 mm or appearance of at least 1 new lesion.	From day of first dose until disease progression or death (due to any cause) whichever occur first (maximum duration: up to 286 days)
Secondary	Dose Escalation: Duration of Response (DOR)	DOR was defined as the time between the date of the first documented objective response (PR or CR) and the date of the first documented progression or death (due to any cause) whichever occurs first. As per RECIST v 1.1: CR was defined as the disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to <10 mm. PR was defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters. Progressive disease was defined as at least a 20% increase in the sum of diameters of target lesions.	From date of first documented response to date of first documented PD or death (due to any cause) whichever occurred first (maximum duration: up to 286 days)
Secondary	Dose Expansion: Percentage of Participants With Confirmed Objective Response (OR) as Per Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.1 by Blinded Independent Central Review (BICR)	Confirmed OR in participants was defined as the percentage of participants with CR or PR as best response determined by BICR as per RECIST v 1.1 and confirmed by a second image at least 4 weeks from the initial imaging showing response. As per RECIST v 1.1, CR was defined as disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to <10 mm. PR was defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters.	From start of the treatment until disease progression or death (due to any cause) whichever occurred first (maximum duration: up to 502 days)
Secondary	Dose Expansion: Percentage of Participants With Confirmed Disease Control as Per Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.1 by Investigator Assessment	Disease Control (DC) was defined as participants with a confirmed CR, confirmed PR and SD at 16 and 24 weeks as assessed by investigator as per RECIST v 1.1. As per RECIST v 1.1, CR was defined as disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to <10 mm. PR was defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters. SD was defined as neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for progressive disease (at least a 20% increase in the sum of diameters of target lesions) taking as reference the smallest sum diameters while on study.	Baseline up to Week 16, Baseline up to Week 24
Secondary	Dose Expansion: Percentage of Participants With Confirmed Disease Control as Per Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.1 by Blinded Independent Central Review (BICR)	Disease Control (DC) was defined as participants with a confirmed CR, confirmed PR and SD at 16 and 24 weeks as assessed by BICR as per RECIST v 1.1. As per RECIST v 1.1, CR was defined as disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to <10 mm. PR was defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters. SD was defined as neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for progressive disease (at least a 20% increase in the sum of diameters of target lesions) taking as reference the smallest sum diameters while on study.	Baseline up to Week 16, Baseline up to Week 24
Secondary	Dose Expansion: Time-to-Tumor Response (TTR) as Per Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.1 by Investigator Assessment	TTR was defined as the time (in months) from the date of first dose of study drug to the first documentation of objective response (CR or PR) as assessed by investigator according to RECIST v 1.1. As per RECIST v 1.1, CR was defined as disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to <10 mm. PR was defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters.	From first dose of study drug until first documentation of CR or PR (maximum duration: up to 502 days)
Secondary	Dose Expansion: Time-to-Tumor Response (TTR) as Per Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.1 by Blinded Independent Central Review (BICR)	TTR was defined as the time (in months) from the date of first dose of study drug to the first documentation of objective response (CR or PR) as assessed by BICR according to RECIST v 1.1. As per RECIST v 1.1, CR was defined as disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to <10 mm. PR was defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters.	From first dose of study drug until first documentation of CR or PR (maximum duration: up to 502 days)
Secondary	Dose Expansion: Duration of Response (DOR) as Per Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.1 by Investigator Assessment	DOR was defined as the time between the date of first documented objective response (PR or CR) and the date of first documented progression or death (due to any cause) whichever occurs first. As per RECIST v 1.1: CR was defined as the disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to <10 mm. PR was defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters. Progressive disease was defined as at least a 20% increase in the sum of diameters of target lesions.	From date of first documented response to date of first documented PD or death (due to any cause) whichever occurred first (maximum duration: up to 502 days)
Secondary	Dose Expansion: Duration of Response (DOR) as Per Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.1 by Blinded Independent Central Review (BICR)	DOR was defined as the time between the date of first documented objective response (PR or CR) and the date of first documented progression or death (due to any cause) whichever occurs first. As per RECIST v 1.1: CR was defined as the disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to <10 mm. PR was defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters. Progressive disease was defined as at least a 20% increase in the sum of diameters of target lesions.	From date of first documented response to date of first documented PD or death (due to any cause) whichever occurred first (maximum duration: up to 502 days)
Secondary	Dose Expansion: Progression Free Survival (PFS) as Per Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.1 by Investigator Assessment	PFS was defined as the time from the date of first dose of study drug to the earliest date of disease progression per RECIST v 1.1, or death due to any cause, whichever occurs first. PD = at least a 20% increase in the sum of diameters of measured lesions taking as references the smallest sum of diameters recorded on study (including baseline) and an absolute increase of >=5 mm or appearance of at least 1 new lesion.	From day of first dose until disease progression or death (due to any cause) whichever occur first (maximum duration: up to 502 days)
Secondary	Dose Expansion: Progression Free Survival (PFS) as Per Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.1 by Blinded Independent Central Review (BICR)	PFS was defined as the time from the date of first dose of study drug to the earliest date of disease progression per RECIST v 1.1, or death due to any cause, whichever occurs first. PD = at least a 20% increase in the sum of diameters of measured lesions taking as references the smallest sum of diameters recorded on study (including baseline) and an absolute increase of >=5 mm or appearance of at least 1 new lesion.	From day of first dose until disease progression or death (due to any cause) whichever occur first (maximum duration: up to 502 days)
Secondary	Dose Expansion: Overall Survival (OS): Probability of Participants Who Were Event-Free at Month 12	OS was defined as the time from the first dose date to date of death due to any cause. Participant was considered as event (overall survival) free if participant was not died and was alive at Month 12. Probability of participants who were event free at Month 12 was estimated by Kaplan-Meier method and reported.	At Month 12
Secondary	Dose Expansion: Trough Concentrations (Ctrough) of Talazoparib	Pre dose plasma drug concentration.	Pre dose at 0 hour on Day 1 of Cycle 2, 3, 4 and unplanned (any time during dose expansion period up to 502 days)

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