A Study of Pertuzumab in Combination With Trastuzumab (Herceptin) and a Taxane in First-Line Treatment in Participants With Human Epidermal Growth Factor 2 (HER2)-Positive Advanced Breast Cancer

Study Overview
=================
Brief Summary
-----------------
This multicenter, open-label, single-arm, Phase IIIb study will evaluate the safety and tolerability of pertuzumab in combination with trastuzumab (Herceptin) and a taxane (docetaxel, paclitaxel or nab-paclitaxel) in first-line treatment in participants with metastatic or locally recurrent HER2-positive breast cancer. Participants will receive pertuzumab intravenously (IV) and trastuzumab (Herceptin) IV plus a taxane in cycles of 3 weeks each until predefined study end, unacceptable toxicity, withdrawal of consent, disease progression, or death, whichever occurs first.

Official Title
-----------------
A Multicenter, Open-Label, Single-Arm Study of Pertuzumab in Combination With Trastuzumab and a Taxane in First Line Treatment of Patients With HER2-Positive Advanced (Metastatic or Locally Recurrent) Breast Cancer

Conditions
-----------------
Breast Neoplasms

Intervention / Treatment
-----------------
* Drug: Docetaxel
* Drug: Nab-paclitaxel
* Drug: Paclitaxel
* Drug: Pertuzumab
* Drug: Trastuzumab


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: Histologically or cytologically confirmed adenocarcinoma of the breast with metastatic or locally recurrent disease not amenable to curative resection HER2-positive breast cancer Eastern cooperative Oncology Group (ECOG) performance status 0, 1 or 2 LVEF of at least 50 percent (%) Exclusion Criteria: Previous systemic non-hormonal anti-cancer therapy for metastatic or locally recurrent disease Disease-free interval from completion of adjuvant or neoadjuvant systemic non-hormonal treatment to recurrence less than or equal to (</=) 6 months Previous approved or investigative anti-HER2 agents in any breast cancer treatment setting, except for trastuzumab and/or lapatinib in the adjuvant or neoadjuvant setting Disease progression while receiving trastuzumab and/or lapatinib in the adjuvant or neoadjuvant setting History of persistent Grade 2 or higher (National Cancer Institute Common Toxicity Criteria [NCI-CTC], Version 4.0) hematological toxicity resulting from previous adjuvant or neoadjuvant therapy Central nervous system (CNS) metastases Current peripheral neuropathy of Grade 3 or greater (NCI-CTC, version 4.0) History of other malignancy within the last 5 years prior to first study drug administration, except for carcinoma in situ of the cervix or basal cell carcinoma Inadequate bone marrow, liver or renal function Uncontrolled hypertension Hepatitis B, hepatitis C or Human Immunodeficiency Virus (HIV) infection

Ages Eligible for Study
-----------------
Minimum Age: 18 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
No

Study Plan
=================
How is the study designed?
-----------------

Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Pertuzumab + Trastuzumab + Taxane<br>Participants will receive pertuzumab and trastuzumab (Herceptin) IV plus a taxane in cycles of 3 weeks each until predefined study end, unacceptable toxicity, withdrawal of consent, disease progression, or death, whichever occurs first. Taxane chemotherapy can be either docetaxel, paclitaxel or nab-paclitaxel as per investigator's choice. | Drug: Docetaxel<br>* Participants may receive 'docetaxel' taxane chemotherapy as per investigator's choice, administered in line with the respective product information and/or recognized clinical practice guidelines.<br>Drug: Nab-paclitaxel<br>* Participants may receive 'nab-paclitaxel' taxane chemotherapy as per investigator's choice, administered in line with the respective product information and/or recognized clinical practice guidelines.<br>Drug: Paclitaxel<br>* Participants may receive 'paclitaxel' taxane chemotherapy as per investigator's choice, administered in line with the respective product information and/or recognized clinical practice guidelines.<br>Drug: Pertuzumab<br>* Participants will receive pertuzumab 840 milligrams (mg) IV on Day 1 or Day 2 of Cycle 1, followed by 420 mg IV on Day 1 or Day 2 of each subsequent 3-week cycle.<br>* Other names: RO 43-68451;Drug: Trastuzumab<br>* Participants will receive trastuzumab (Herceptin) 8 milligrams per kilogram (mg/kg) IV on Day 1 or Day 2 of Cycle 1, followed by 6 mg/kg IV on Day 1 or Day 2 of each subsequent 3-week cycle, administered in line with the respective product Information and/or recognized clinical practice guidelines.<br>* Other names: Herceptin;|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Overview of the Number of Participants With at Least One Treatment-Emergent Adverse Event, Severity Determined According to National Cancer Institute Common Terminology Criteria for Adverse Events, Version 4.0 (NCI-CTCAE v4.0) | Treatment-emergent adverse events (TEAEs) were adverse events (AEs) that started or worsened in severity on or after the first administration of study drug, up to and including 28 days after the last dose. The investigator graded all AEs for severity per NCI-CTCAE v4.0; if not listed, the AE was assessed as follows: Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening/disabling; Grade 5 = death. The investigator determined whether an AE was related to study drug and independently assessed severity and seriousness of each AE. TEAEs to monitor included anaphylaxis and hypersensitivity, cardiac dysfunction, diarrhoea Grade ≥3, pregnancy-related AEs, interstitial lung disease, infusion-/administration-related reactions, mucositis, (febrile) neutropenia, rash/skin reactions, and suspected transmission of infectious agent. TEAEs of special interest included LVEF decreased, liver enzymes increased, and suspected transmission of infectious agent by the study drug. | From Baseline until 28 days after, or 7 months after (only for serious AEs related to study drug), the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Number of Participants Who Died Over the Course of the Study by Reported Cause of Death (Adverse Events Leading to Death by System Organ Class and Preferred Term) | All adverse events leading to death, regardless of whether they were classified as treatment emergent, are listed by system organ class (SOC) and preferred term (PT) according to the Medical Dictionary for Regulatory Activities, version 22.1 (MedDRA version 22.1); PTs that are part of a given SOC are listed in the rows directly below each SOC within the results table. Admin. = administration; Mediast. = mediastinal | The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Number of Participants Who Died Within 6 Months of Starting Study Treatment by Reported Cause of Death (Adverse Events Leading to Death by System Organ Class and Preferred Term) | All adverse events leading to death, regardless of whether they were classified as treatment emergent, are listed by system organ class (SOC) and preferred term (PT) according to the Medical Dictionary for Regulatory Activities, version 22.1 (MedDRA version 22.1); PTs that are part of a given SOC are listed in the rows directly below each SOC within the results table. Admin. = administration; Mediast. = mediastinal | The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Number of Participants With Grade ≥3 Treatment-Emergent Adverse Events, Occurring in ≥1% of Participants by System Organ Class and Preferred Term | Treatment-emergent adverse events (TEAEs) were adverse events (AEs) that started or worsened in severity on or after the first administration of study drug, up to and including 28 days after the last dose. The investigator graded all AEs for severity per NCI-CTCAE v4.0; if not listed, the AE was assessed as follows: Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening/disabling; Grade 5 = death. The investigator determined whether an AE was related to study drug and independently assessed severity and seriousness of each AE. MedDRA version 22.1 was used to code AEs by system organ class (SOC) and preferred term (PT); PTs that are part of a given SOC are listed in the rows directly below each SOC within the results table. If a participant experienced the same AE at more than one severity grade, only the most severe grade was presented. | From Baseline until 28 days after, or 7 months after (only for serious AEs related to study drug), the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Number of Participants With Treatment-Emergent Adverse Events of Any Grade That Were Related to Study Treatment (Pertuzumab, Trastuzumab, or Taxane), Occurring in ≥10% of Participants by System Organ Class | Treatment-emergent adverse events (TEAEs) were adverse events (AEs) that started or worsened in severity on or after the first administration of study drug, up to and including 28 days after the last dose. The investigator graded all AEs for severity per NCI-CTCAE v4.0; if not listed, the AE was assessed as follows: Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening/disabling; Grade 5 = death. The investigator determined whether an AE was related to study drug and independently assessed severity and seriousness of each AE. MedDRA version 22.1 was used to code AEs and the system organ classes are presented in descending order according to the total frequency of occurrence. If a participant experienced more than one event in a category, they were counted only once in that category. | From Baseline until 28 days after, or 7 months after (only for serious AEs related to study drug), the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Number of Participants With Grade ≥3 Treatment-Emergent Adverse Events That Were Related to Study Treatment (Pertuzumab, Trastuzumab, or Taxane), Occurring in ≥0.5% of Participants by Preferred Term | Treatment-emergent adverse events (TEAEs) were adverse events (AEs) that started or worsened in severity on or after the first administration of study drug, up to and including 28 days after the last dose. The investigator graded all AEs for severity per NCI-CTCAE v4.0; if not listed, the AE was assessed as follows: Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening/disabling; Grade 5 = death. The investigator determined whether an AE was related to study drug and independently assessed severity and seriousness of each AE. MedDRA version 22.1 was used to code AEs and the preferred terms are presented in descending order according to the total frequency of occurrence. If a participant experienced more than one event in a category, they were counted only once in that category. | From Baseline until 28 days after, or 7 months after (only for serious AEs related to study drug), the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Number of Participants With Treatment-Emergent Adverse Events Leading to Discontinuation of Study Treatment (Pertuzumab, Trastuzumab, or Taxane), Occurring in ≥0.2% of Participants by Preferred Term | Treatment-emergent adverse events (TEAEs) were adverse events (AEs) that started or worsened in severity on or after the first administration of study drug, up to and including 28 days after the last dose. The investigator graded all AEs for severity per NCI-CTCAE v4.0; if not listed, the AE was assessed as follows: Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening/disabling; Grade 5 = death. The investigator determined whether an AE was related to study drug and independently assessed severity and seriousness of each AE. MedDRA version 22.1 was used to code AEs and the preferred terms are presented in descending order according to the total frequency of occurrence. If a participant experienced more than one event in a category, they were counted only once in that category. Discont. = discontinuation; Ptz = pertuzumab; Tax = taxane; Trz = trastuzumab | From Baseline until 28 days after, or 7 months after (only for serious AEs related to study drug), the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Number of Participants With Treatment-Emergent Adverse Events Leading to Dose Interruption of Study Treatment (Pertuzumab, Trastuzumab, or Taxane), Occurring in ≥0.5% of Participants by Preferred Term | Treatment-emergent adverse events (TEAEs) were adverse events (AEs) that started or worsened in severity on or after the first administration of study drug, up to and including 28 days after the last dose. The investigator graded all AEs for severity per NCI-CTCAE v4.0; if not listed, the AE was assessed as follows: Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening/disabling; Grade 5 = death. The investigator determined whether an AE was related to study drug and independently assessed severity and seriousness of each AE. MedDRA version 22.1 was used to code AEs and the preferred terms are presented in descending order according to the total frequency of occurrence. If a participant experienced more than one event in a category, they were counted only once in that category. Interrupt. = interruption; Ptz = pertuzumab; Tax = taxane; Trz = trastuzumab | From Baseline until 28 days after, or 7 months after (only for serious AEs related to study drug), the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Number of Participants With Treatment-Emergent Adverse Events to Monitor of Any Grade, Occurring in ≥5% of Participants by Category | Treatment-emergent adverse events (TEAEs) were adverse events (AEs) that started or worsened in severity on or after the first dose of study drug, up to and including 28 days after the last dose. The investigator graded all AEs for severity per NCI-CTCAE v4.0; if not listed, it was assessed as follows: Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening/disabling; Grade 5 = death. If a participant had more than one event in a category, they were counted only once in that category. TEAEs to monitor included anaphylaxis and hypersensitivity, cardiac dysfunction, diarrhoea Grade ≥3, pregnancy-related AEs, interstitial lung disease, infusion-/administration-related reactions, mucositis, (febrile) neutropenia, rash/skin reactions, and suspected transmission of infectious agent. MedDRA version 22.1 was used to code AEs; AEs may fall within multiple categories. | From Baseline until 28 days after, or 7 months after (only for serious AEs related to study drug), the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Number of Participants With Grade ≥3 Treatment-Emergent Adverse Events to Monitor, Occurring in ≥0.5% of Participants by Category and Preferred Term | Treatment-emergent adverse events (TEAEs) were adverse events (AEs) that started or worsened in severity on or after the first dose of study drug, up to and including 28 days after the last dose. The investigator graded all AEs for severity per NCI-CTCAE v4.0; if not listed, it was assessed as follows: Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening/disabling; Grade 5 = death. If a participant had more than one event in a category, they were counted only once in that category. TEAEs to monitor included anaphylaxis and hypersensitivity, cardiac dysfunction, diarrhoea Grade ≥3, pregnancy-related AEs, interstitial lung disease, infusion-/administration-related reactions, mucositis, (febrile) neutropenia, rash/skin reactions, and suspected transmission of infectious agent. MedDRA version 22.1 was used to code AEs; preferred terms (PT) that are part of a given category are listed in the rows directly below each category within the results table. | From Baseline until 28 days after, or 7 months after (only for serious AEs related to study drug), the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Number of Participants With Treatment-Emergent Adverse Events of Special Interest by Category and Preferred Term | Treatment-emergent adverse events (TEAEs) were adverse events (AEs) that started or worsened in severity on or after the first administration of study drug, up to and including 28 days after the last dose. The investigator graded all AEs for severity per NCI-CTCAE v4.0; if not listed, the AE was assessed as follows: Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening/disabling; Grade 5 = death. The investigator determined whether an AE was related to study drug and independently assessed severity and seriousness of each AE. TEAEs of special interest included LVEF decreased, liver enzymes (ALT or AST) increased, and suspected transmission of infectious agent by the study drug. MedDRA version 22.1 was used to code AEs; preferred terms (PT) that are part of a given category are listed in the rows directly below each category within the results table. If a participant experienced more than one event in a category, they were counted only once in that category. | From Baseline until 28 days after, or 7 months after (only for serious AEs related to study drug), the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Subgroup Analysis by Region of Enrollment: Overview of the Number of Participants With Serious Treatment-Emergent Adverse Events (TEAEs), Grade ≥3 TEAEs, and Grade ≥3 TEAEs Related to Pertuzumab | Treatment-emergent adverse events (TEAEs) were adverse events (AEs) that started or worsened in severity on or after the first administration of study drug, up to and including 28 days after the last dose. The investigator graded all AEs for severity per NCI-CTCAE v4.0; if not listed, the AE was assessed as follows: Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening/disabling; Grade 5 = death. The investigator determined whether an AE was related to study drug and independently assessed severity and seriousness of each AE. | From Baseline until 28 days after, or 7 months after (only for serious AEs related to study drug), the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Subgroup Analysis by Age (≤65 vs. >65 Years): Overview of the Number of Participants With Serious Treatment-Emergent Adverse Events (TEAEs), TEAEs Leading to Death, Grade ≥3 TEAEs, Any-Grade and Grade ≥3 TEAEs Related to Pertuzumab, and TEAEs to Monitor | Treatment-emergent adverse events (TEAEs) were adverse events (AEs) that started or worsened in severity on or after the first administration of study drug, up to and including 28 days after the last dose. The investigator graded all AEs for severity per NCI-CTCAE v4.0; if not listed, the AE was assessed as follows: Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening/disabling; Grade 5 = death. The investigator determined whether an AE was related to study drug and independently assessed severity and seriousness of each AE. TEAEs to monitor included anaphylaxis and hypersensitivity, cardiac dysfunction, diarrhoea Grade ≥3, pregnancy-related AEs, interstitial lung disease, infusion-/administration-related reactions, mucositis, (febrile) neutropenia, rash/skin reactions, and suspected transmission of infectious agent. | From Baseline until 28 days after, or 7 months after (only for serious AEs related to study drug), the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Subgroup Analysis by Taxane Chemotherapy: Overview of the Number of Participants With Serious Treatment-Emergent Adverse Events (TEAEs), TEAEs Leading to Death, Grade ≥3 TEAEs, Any-Grade and Grade ≥3 TEAEs Related to Pertuzumab, and TEAEs to Monitor | Treatment-emergent adverse events (TEAEs) were adverse events (AEs) that started or worsened in severity on or after the first administration of study drug, up to and including 28 days after the last dose. The investigator graded all AEs for severity per NCI-CTCAE v4.0; if not listed, the AE was assessed as follows: Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening/disabling; Grade 5 = death. The investigator determined whether an AE was related to study drug and independently assessed severity and seriousness of each AE. TEAEs to monitor included anaphylaxis and hypersensitivity, cardiac dysfunction, diarrhoea Grade ≥3, pregnancy-related AEs, interstitial lung disease, infusion-/administration-related reactions, mucositis, (febrile) neutropenia, rash/skin reactions, and suspected transmission of infectious agent. | From Baseline until 28 days after, or 7 months after (only for serious AEs related to study drug), the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Subgroup Analysis by ECOG Performance Status at Baseline: Overview of the Number of Participants With Serious Treatment-Emergent Adverse Events (TEAEs), Grade ≥3 TEAEs, and Grade ≥3 TEAEs Related to Pertuzumab | Treatment-emergent adverse events (TEAEs) were adverse events (AEs) that started or worsened in severity on or after the first administration of study drug, up to and including 28 days after the last dose. The investigator graded all AEs for severity per NCI-CTCAE v4.0; if not listed, the AE was assessed as follows: Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening/disabling; Grade 5 = death. The investigator determined whether an AE was related to study drug and independently assessed severity and seriousness of each AE. | From Baseline until 28 days after, or 7 months after (only for serious AEs related to study drug), the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Subgroup Analysis by Visceral Disease at Baseline: Overview of the Number of Participants With Serious Treatment-Emergent Adverse Events (TEAEs), Grade ≥3 TEAEs, and Grade ≥3 TEAEs Related to Pertuzumab | Treatment-emergent adverse events (TEAEs) were adverse events (AEs) that started or worsened in severity on or after the first administration of study drug, up to and including 28 days after the last dose. The investigator graded all AEs for severity per NCI-CTCAE v4.0; if not listed, the AE was assessed as follows: Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening/disabling; Grade 5 = death. The investigator determined whether an AE was related to study drug and independently assessed severity and seriousness of each AE. | From Baseline until 28 days after, or 7 months after (only for serious AEs related to study drug), the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Subgroup Analysis by Prior (Neo)Adjuvant Chemotherapy: Overview of the Number of Participants With Serious Treatment-Emergent Adverse Events (TEAEs), Grade ≥3 TEAEs, and Grade ≥3 TEAEs Related to Pertuzumab | Treatment-emergent adverse events (TEAEs) were adverse events (AEs) that started or worsened in severity on or after the first administration of study drug, up to and including 28 days after the last dose. The investigator graded all AEs for severity per NCI-CTCAE v4.0; if not listed, the AE was assessed as follows: Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening/disabling; Grade 5 = death. The investigator determined whether an AE was related to study drug and independently assessed severity and seriousness of each AE. | From Baseline until 28 days after, or 7 months after (only for serious AEs related to study drug), the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Subgroup Analysis by Hormone Receptor Status at Baseline: Overview of the Number of Participants With Serious Treatment-Emergent Adverse Events (TEAEs), Grade ≥3 TEAEs, and Grade ≥3 TEAEs Related to Pertuzumab | Treatment-emergent adverse events (TEAEs) were adverse events (AEs) that started or worsened in severity on or after the first administration of study drug, up to and including 28 days after the last dose. The investigator graded all AEs for severity per NCI-CTCAE v4.0; if not listed, the AE was assessed as follows: Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening/disabling; Grade 5 = death. The investigator determined whether an AE was related to study drug and independently assessed severity and seriousness of each AE. | From Baseline until 28 days after, or 7 months after (only for serious AEs related to study drug), the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Subgroup Analysis by Previous Trastuzumab Therapy: Overview of the Number of Participants With Serious Treatment-Emergent Adverse Events (TEAEs), Grade ≥3 TEAEs, and Grade ≥3 TEAEs Related to Pertuzumab | Treatment-emergent adverse events (TEAEs) were adverse events (AEs) that started or worsened in severity on or after the first administration of study drug, up to and including 28 days after the last dose. The investigator graded all AEs for severity per NCI-CTCAE v4.0; if not listed, the AE was assessed as follows: Grade 1 = mild; Grade 2 = moderate; Grade 3 = severe; Grade 4 = life-threatening/disabling; Grade 5 = death. The investigator determined whether an AE was related to study drug and independently assessed severity and seriousness of each AE. | From Baseline until 28 days after, or 7 months after (only for serious AEs related to study drug), the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Number of Participants With a Congestive Heart Failure Event | Congestive heart failure was defined as the Standardised MedDRA Query (SMQ) 'Cardiac failure (wide)' from the Medical Dictionary for Regulatory Activities, version 22.1 (MedDRA version 22.1). | From Baseline until 28 days after the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Time to Onset of the First Episode of Congestive Heart Failure | Congestive heart failure was defined as SMQ 'Cardiac failure (wide)' from the MedDRA version 22.1. Time to onset of the first episode of congestive heart failure was analyzed using a Kaplan-Meier approach. Participants who did not experience any congestive heart failure at the time of data-cut were censored at the date of the last attended visit whilst on-treatment (including visits up to and including 28 days after last dose of study treatment). Only treatment emergent congestive heart failure events are included. | From Baseline until 28 days after the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Change From Baseline in Left Ventricular Ejection Fraction (LVEF) Values Over the Course of the Study | All participants must have had a baseline LVEF ≥50% to enroll in the study; patients with significant cardiac disease or baseline LVEF below 50% were not eligible for this study. The change from baseline LVEF values were reported at every 3 cycles over the course of the study and at the final treatment, worst treatment, and maximum decrease values. The final treatment value was defined as the last LVEF value observed before all study treatment discontinuation. The worst treatment value was defined as the lowest LVEF value observed before all study treatment discontinuation. The maximum decrease value was defined as the largest decrease of LVEF value from baseline, or minimum increase if a participant's post-baseline LVEF measures were all larger than the baseline value. | Baseline, predose on Day 1 of every 3 cycles (1 cycle is 3 weeks) during treatment period, and 28 days post-treatment safety follow-up. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Number of Participants by Change From Baseline in Left Ventricular Ejection Fraction (LVEF) Categories Over the Course of the Study | All participants must have had a baseline LVEF greater than or equal to (≥)50% to enroll in the study; patients with significant cardiac disease or baseline LVEF below 50% were not eligible for this study. The number of participants are reported according to four change from baseline in LVEF value categories over the course of the study: 1) an increase or decrease from baseline LVEF less than (<)10% points or no change in LVEF; 2) an absolute LVEF value <45% points and a decrease from baseline LVEF ≥10% points to <15% points; 3) an absolute LVEF value <45% points and a decrease from baseline LVEF ≥15% points; or 4) an absolute LVEF value ≥45% points and a decrease from baseline LVEF ≥10% points. BL = baseline; Decr. = decrease; Incr. = increase | Baseline, predose on Day 1 of every 3 cycles (1 cycle is 3 weeks) during treatment period, and 28 days post-treatment safety follow-up. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Number of Participants With Laboratory Abnormalities in Hematology and Coagulation Parameters: Shift From Baseline to the Worst Post-Baseline Grade According to NCI-CTC v4.0 | Clinical laboratory tests for hematology and coagulation parameters were performed at local laboratories. Laboratory toxicities were defined based on NCI-CTC v4.0 from Grades 1 (least severe) to 4 (most severe). Some laboratory parameters are bi-dimensional (i.e. can be graded in both the low and high direction). These parameters were split and presented in both directions. Baseline was defined as the last non-missing measurement taken prior to the first dose of study treatment (including unscheduled assessments). Values from all visits, including unscheduled visits, were included in the derivation of the worst post-baseline grade. Not every abnormal laboratory value qualified as an adverse event, only if it met any of the following criteria: was clinically significant (per investigator); was accompanied by clinical symptoms; resulted in a change in study treatment; or resulted in a medical intervention or a change in concomitant therapy. | Predose at each treatment cycle (1 cycle is 3 weeks) from Baseline until 28 days after the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Number of Participants With Laboratory Abnormalities in Hematology and Coagulation Parameters: Shift From Baseline to the Worst Post-Baseline Grade According to Normal Range Criteria | Clinical laboratory tests for hematology and coagulation parameters were performed at local laboratories. Laboratory toxicities were defined based on local laboratory normal ranges (for parameters with NCI-CTC grade not defined). Some laboratory parameters are bi-dimensional (i.e. can be graded in both the low and high direction). These parameters were split and presented in both directions. Baseline was defined as the last non-missing measurement taken prior to the first dose of study treatment (including unscheduled assessments). Values from all visits, including unscheduled visits, were included in the derivation of the worst post-baseline grade. Not every abnormal laboratory value qualified as an adverse event, only if it met any of the following criteria: was clinically significant (per investigator); was accompanied by clinical symptoms; resulted in a change in study treatment; or resulted in a medical intervention or a change in concomitant therapy. | Predose at each treatment cycle (1 cycle is 3 weeks) from Baseline until 28 days after the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Number of Participants With Laboratory Abnormalities in Biochemistry Parameters: Shift From Baseline to the Worst Post-Baseline Grade According to NCI-CTC v4.0 | Clinical laboratory tests for biochemistry parameters were performed at local laboratories. Laboratory toxicities were defined based on NCI-CTC v4.0 from Grades 1 (least severe) to 4 (most severe). Some laboratory parameters are bi-dimensional (i.e. can be graded in both the low and high direction). These parameters were split and presented in both directions. Baseline was defined as the last non-missing measurement taken prior to the first dose of study treatment (including unscheduled assessments). Values from all visits, including unscheduled visits, were included in the derivation of the worst post-baseline grade. Not every abnormal laboratory value qualified as an adverse event, only if it met any of the following criteria: was clinically significant (per investigator); was accompanied by clinical symptoms; resulted in a change in study treatment; or resulted in a medical intervention or a change in concomitant therapy. | Predose at each treatment cycle (1 cycle is 3 weeks) from Baseline until 28 days after the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Number of Participants With Laboratory Abnormalities in Biochemistry Parameters: Shift From Baseline to the Worst Post-Baseline Grade According to Normal Range Criteria | Clinical laboratory tests for biochemistry parameters were performed at local laboratories. Laboratory toxicities were defined based on local laboratory normal ranges (for parameters with NCI-CTC grade not defined). Some laboratory parameters are bi-dimensional (i.e. can be graded in both the low and high direction). These parameters were split and presented in both directions. Baseline was defined as the last non-missing measurement taken prior to the first dose of study treatment (including unscheduled assessments). Values from all visits, including unscheduled visits, were included in the derivation of the worst post-baseline grade. Not every abnormal laboratory value qualified as an adverse event, only if it met any of the following criteria: was clinically significant (per investigator); was accompanied by clinical symptoms; resulted in a change in study treatment; or resulted in a medical intervention or a change in concomitant therapy. | Predose at each treatment cycle (1 cycle is 3 weeks) from Baseline until 28 days after the last dose of study treatment. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Progression-Free Survival, as Assessed by the Investigator Using Response Evaluation Criteria in Solid Tumors, Version 1.1 (RECIST v1.1) | Progression-free survival (PFS) was defined as the time between the date of enrollment and the date of first radiographically documented progressive disease assessment (by the investigator using RECIST v1.1) or death, whichever occurred first. PFS was analyzed using a Kaplan-Meier approach. Participants who had neither progressed nor died at the time of clinical cut-off or who were lost to follow-up were censored at the date of the last evaluable tumor assessment (response assessment with the latest end date); if no post-baseline assessments were available, such participants were censored at Day 1. If a participant missed 2 or more consecutive visits, then they were censored at the last evaluable visit prior to the missed visits. Tumor assessments were performed every 3 cycles (1 cycle is 3 weeks) for up to 36 months and at least every 12 cycles thereafter during treatment, and at least every 36 weeks post-treatment (if progression-free after 36 months), until disease progression. | From date of enrollment until date of disease progression or death, whichever occurred first. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Subgroup Analysis by Region of Enrollment: Progression-Free Survival, as Assessed by the Investigator Using RECIST v1.1 | Progression-free survival (PFS) was defined as the time between the date of enrollment and the date of first radiographically documented progressive disease assessment (by the investigator using RECIST v1.1) or death, whichever occurred first. PFS was analyzed using a Kaplan-Meier approach. Participants who had neither progressed nor died at the time of clinical cut-off or who were lost to follow-up were censored at the date of the last evaluable tumor assessment (response assessment with the latest end date); if no post-baseline assessments were available, such participants were censored at Day 1. If a participant missed 2 or more consecutive visits, then they were censored at the last evaluable visit prior to the missed visits. Tumor assessments were performed every 3 cycles (1 cycle is 3 weeks) for up to 36 months and at least every 12 cycles thereafter during treatment, and at least every 36 weeks post-treatment (if progression-free after 36 months), until disease progression. | From date of enrollment until date of disease progression or death, whichever occurred first. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Subgroup Analysis by Age (≤65 vs. >65 Years): Progression-Free Survival, as Assessed by the Investigator Using RECIST v1.1 | Progression-free survival (PFS) was defined as the time between the date of enrollment and the date of first radiographically documented progressive disease assessment (by the investigator using RECIST v1.1) or death, whichever occurred first. PFS was analyzed using a Kaplan-Meier approach. Participants who had neither progressed nor died at the time of clinical cut-off or who were lost to follow-up were censored at the date of the last evaluable tumor assessment (response assessment with the latest end date); if no post-baseline assessments were available, such participants were censored at Day 1. If a participant missed 2 or more consecutive visits, then they were censored at the last evaluable visit prior to the missed visits. Tumor assessments were performed every 3 cycles (1 cycle is 3 weeks) for up to 36 months and at least every 12 cycles thereafter during treatment, and at least every 36 weeks post-treatment (if progression-free after 36 months), until disease progression. | From date of enrollment until date of disease progression or death, whichever occurred first. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Subgroup Analysis by ECOG Performance Status at Baseline: Progression-Free Survival, as Assessed by the Investigator Using RECIST v1.1 | Progression-free survival (PFS) was defined as the time between the date of enrollment and the date of first radiographically documented progressive disease assessment (by the investigator using RECIST v1.1) or death, whichever occurred first. PFS was analyzed using a Kaplan-Meier approach. Participants who had neither progressed nor died at the time of clinical cut-off or who were lost to follow-up were censored at the date of the last evaluable tumor assessment (response assessment with the latest end date); if no post-baseline assessments were available, such participants were censored at Day 1. If a participant missed 2 or more consecutive visits, then they were censored at the last evaluable visit prior to the missed visits. Tumor assessments were performed every 3 cycles (1 cycle is 3 weeks) for up to 36 months and at least every 12 cycles thereafter during treatment, and at least every 36 weeks post-treatment (if progression-free after 36 months), until disease progression. | From date of enrollment until date of disease progression or death, whichever occurred first. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Subgroup Analysis by Taxane Chemotherapy: Progression-Free Survival, as Assessed by the Investigator Using RECIST v1.1 | Progression-free survival (PFS) was defined as the time between the date of enrollment and the date of first radiographically documented progressive disease assessment (by the investigator using RECIST v1.1) or death, whichever occurred first. PFS was analyzed using a Kaplan-Meier approach. Participants who had neither progressed nor died at the time of clinical cut-off or who were lost to follow-up were censored at the date of the last evaluable tumor assessment (response assessment with the latest end date); if no post-baseline assessments were available, such participants were censored at Day 1. If a participant missed 2 or more consecutive visits, then they were censored at the last evaluable visit prior to the missed visits. Tumor assessments were performed every 3 cycles (1 cycle is 3 weeks) for up to 36 months and at least every 12 cycles thereafter during treatment, and at least every 36 weeks post-treatment (if progression-free after 36 months), until disease progression. | From date of enrollment until date of disease progression or death, whichever occurred first. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Subgroup Analysis by Visceral Disease at Baseline: Progression-Free Survival, as Assessed by the Investigator Using RECIST v1.1 | Progression-free survival (PFS) was defined as the time between the date of enrollment and the date of first radiographically documented progressive disease assessment (by the investigator using RECIST v1.1) or death, whichever occurred first. PFS was analyzed using a Kaplan-Meier approach. Participants who had neither progressed nor died at the time of clinical cut-off or who were lost to follow-up were censored at the date of the last evaluable tumor assessment (response assessment with the latest end date); if no post-baseline assessments were available, such participants were censored at Day 1. If a participant missed 2 or more consecutive visits, then they were censored at the last evaluable visit prior to the missed visits. Tumor assessments were performed every 3 cycles (1 cycle is 3 weeks) for up to 36 months and at least every 12 cycles thereafter during treatment, and at least every 36 weeks post-treatment (if progression-free after 36 months), until disease progression. | From date of enrollment until date of disease progression or death, whichever occurred first. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Subgroup Analysis by Prior (Neo)Adjuvant Chemotherapy: Progression-Free Survival, as Assessed by the Investigator Using RECIST v1.1 | Progression-free survival (PFS) was defined as the time between the date of enrollment and the date of first radiographically documented progressive disease assessment (by the investigator using RECIST v1.1) or death, whichever occurred first. PFS was analyzed using a Kaplan-Meier approach. Participants who had neither progressed nor died at the time of clinical cut-off or who were lost to follow-up were censored at the date of the last evaluable tumor assessment (response assessment with the latest end date); if no post-baseline assessments were available, such participants were censored at Day 1. If a participant missed 2 or more consecutive visits, then they were censored at the last evaluable visit prior to the missed visits. Tumor assessments were performed every 3 cycles (1 cycle is 3 weeks) for up to 36 months and at least every 12 cycles thereafter during treatment, and at least every 36 weeks post-treatment (if progression-free after 36 months), until disease progression. | From date of enrollment until date of disease progression or death, whichever occurred first. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Subgroup Analysis by Hormone Receptor Status at Baseline: Progression-Free Survival, as Assessed by the Investigator Using RECIST v1.1 | Progression-free survival (PFS) was defined as the time between the date of enrollment and the date of first radiographically documented progressive disease assessment (by the investigator using RECIST v1.1) or death, whichever occurred first. PFS was analyzed using a Kaplan-Meier approach. Participants who had neither progressed nor died at the time of clinical cut-off or who were lost to follow-up were censored at the date of the last evaluable tumor assessment (response assessment with the latest end date); if no post-baseline assessments were available, such participants were censored at Day 1. If a participant missed 2 or more consecutive visits, then they were censored at the last evaluable visit prior to the missed visits. Tumor assessments were performed every 3 cycles (1 cycle is 3 weeks) for up to 36 months and at least every 12 cycles thereafter during treatment, and at least every 36 weeks post-treatment (if progression-free after 36 months), until disease progression. | From date of enrollment until date of disease progression or death, whichever occurred first. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Subgroup Analysis by Previous Trastuzumab Therapy: Progression-Free Survival, as Assessed by the Investigator Using RECIST v1.1 | Progression-free survival (PFS) was defined as the time between the date of enrollment and the date of first radiographically documented progressive disease assessment (by the investigator using RECIST v1.1) or death, whichever occurred first. PFS was analyzed using a Kaplan-Meier approach. Participants who had neither progressed nor died at the time of clinical cut-off or who were lost to follow-up were censored at the date of the last evaluable tumor assessment (response assessment with the latest end date); if no post-baseline assessments were available, such participants were censored at Day 1. If a participant missed 2 or more consecutive visits, then they were censored at the last evaluable visit prior to the missed visits. Tumor assessments were performed every 3 cycles (1 cycle is 3 weeks) for up to 36 months and at least every 12 cycles thereafter during treatment, and at least every 36 weeks post-treatment (if progression-free after 36 months), until disease progression. | From date of enrollment until date of disease progression or death, whichever occurred first. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Overall Survival | Overall survival was defined as time from the date of enrollment until the date of death due to any cause. Overall survival was analyzed using a Kaplan-Meier approach. Participants who had not died were censored at the last date they were known to be alive. When it was not possible to confirm the full death date, partial death dates were imputed to: 01 June of that year if only the year was known, 15th of that month if only the month and year were known. If the imputed date was before the last known alive date, the last known alive date was used as the imputation. | From date of enrollment until death due to any cause. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Subgroup Analysis by Region of Enrollment: Overall Survival | Overall survival was defined as time from the date of enrollment until the date of death due to any cause. Overall survival was analyzed using a Kaplan-Meier approach. Participants who had not died were censored at the last date they were known to be alive. When it was not possible to confirm the full death date, partial death dates were imputed to: 01 June of that year if only the year was known, 15th of that month if only the month and year were known. If the imputed date was before the last known alive date, the last known alive date was used as the imputation. | From date of enrollment until death due to any cause. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Subgroup Analysis by Age (≤65 vs. >65 Years): Overall Survival | Overall survival was defined as time from the date of enrollment until the date of death due to any cause. Overall survival was analyzed using a Kaplan-Meier approach. Participants who had not died were censored at the last date they were known to be alive. When it was not possible to confirm the full death date, partial death dates were imputed to: 01 June of that year if only the year was known, 15th of that month if only the month and year were known. If the imputed date was before the last known alive date, the last known alive date was used as the imputation. | From date of enrollment until death due to any cause. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Subgroup Analysis by ECOG Performance Status at Baseline: Overall Survival | Overall survival was defined as time from the date of enrollment until the date of death due to any cause. Overall survival was analyzed using a Kaplan-Meier approach. Participants who had not died were censored at the last date they were known to be alive. When it was not possible to confirm the full death date, partial death dates were imputed to: 01 June of that year if only the year was known, 15th of that month if only the month and year were known. If the imputed date was before the last known alive date, the last known alive date was used as the imputation. | From date of enrollment until death due to any cause. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Subgroup Analysis by Taxane Chemotherapy: Overall Survival | Overall survival was defined as time from the date of enrollment until the date of death due to any cause. Overall survival was analyzed using a Kaplan-Meier approach. Participants who had not died were censored at the last date they were known to be alive. When it was not possible to confirm the full death date, partial death dates were imputed to: 01 June of that year if only the year was known, 15th of that month if only the month and year were known. If the imputed date was before the last known alive date, the last known alive date was used as the imputation. | From date of enrollment until death due to any cause. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Subgroup Analysis by Visceral Disease at Baseline: Overall Survival | Overall survival was defined as time from the date of enrollment until the date of death due to any cause. Overall survival was analyzed using a Kaplan-Meier approach. Participants who had not died were censored at the last date they were known to be alive. When it was not possible to confirm the full death date, partial death dates were imputed to: 01 June of that year if only the year was known, 15th of that month if only the month and year were known. If the imputed date was before the last known alive date, the last known alive date was used as the imputation. | From date of enrollment until death due to any cause. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Subgroup Analysis by Prior (Neo)Adjuvant Chemotherapy: Overall Survival | Overall survival was defined as time from the date of enrollment until the date of death due to any cause. Overall survival was analyzed using a Kaplan-Meier approach. Participants who had not died were censored at the last date they were known to be alive. When it was not possible to confirm the full death date, partial death dates were imputed to: 01 June of that year if only the year was known, 15th of that month if only the month and year were known. If the imputed date was before the last known alive date, the last known alive date was used as the imputation. | From date of enrollment until death due to any cause. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Subgroup Analysis by Hormone Receptor Status at Baseline: Overall Survival | Overall survival was defined as time from the date of enrollment until the date of death due to any cause. Overall survival was analyzed using a Kaplan-Meier approach. Participants who had not died were censored at the last date they were known to be alive. When it was not possible to confirm the full death date, partial death dates were imputed to: 01 June of that year if only the year was known, 15th of that month if only the month and year were known. If the imputed date was before the last known alive date, the last known alive date was used as the imputation. | From date of enrollment until death due to any cause. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Subgroup Analysis by Previous Trastuzumab Therapy: Overall Survival | Overall survival was defined as time from the date of enrollment until the date of death due to any cause. Overall survival was analyzed using a Kaplan-Meier approach. Participants who had not died were censored at the last date they were known to be alive. When it was not possible to confirm the full death date, partial death dates were imputed to: 01 June of that year if only the year was known, 15th of that month if only the month and year were known. If the imputed date was before the last known alive date, the last known alive date was used as the imputation. | From date of enrollment until death due to any cause. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Overall Response Rate (Complete Response or Partial Response) Based on Best Overall Response (Confirmed) as Assessed by the Investigator Using RECIST v1.1 | The overall response rate was defined as the percentage of participants with complete response (CR) or partial response (PR) as their best confirmed response (≥4 weeks later), as assessed by the investigator using RECIST v1.1 from the start of study treatment until disease progression/recurrence or death. Responses according to RECIST v1.1 are defined as follows: CR = Disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to <10 millimetres (mm).; PR = At least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters. Participants without post-baseline tumor assessments were considered non-responders. | Assessed every 3 cycles (1 cycle is 3 weeks) up to 36 months, and at least every 12 cycles thereafter, until disease progression or death. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Percentage of Participants by Best Overall Response as Assessed by the Investigator Using RECIST v1.1 | Best overall response (BOR) was defined as the best response recorded from the first dose of study treatment until disease progression/recurrence or death in the absence of disease progression. The hierarchy used to determine BOR: Complete Response (CR)>Partial Response (PR)>Stable Disease (SD)>Progressive Disease (PD)>Not Evaluable. Note that CR or PR was confirmed ≥4 weeks later. RECIST v1.1 responses are defined as follows: CR = Disappearance of all target lesions. Any pathological lymph nodes (target or non-target) must have reduction in short axis to <10 millimetres (mm).; PR = At least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum.; PD = At least 20% increase in sum of diameters of target lesions, taking as reference the smallest sum on study, and absolute increase of ≥5 mm.; SD = Neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for PD, taking as reference the smallest sum diameters while on study. | Assessed every 3 cycles (1 cycle is 3 weeks) up to 36 months, and at least every 12 cycles thereafter, until disease progression or death. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Subgroup Analysis by Age (≤65 vs. >65 Years): Overall Response Rate (Complete Response or Partial Response) Based on Best Overall Response (Confirmed) as Assessed by the Investigator Using RECIST v1.1 | The overall response rate was defined as the percentage of participants with complete response (CR) or partial response (PR) as their best confirmed response (≥4 weeks later), as assessed by the investigator using RECIST v1.1 from the start of study treatment until disease progression/recurrence or death. Responses according to RECIST v1.1 are defined as follows: CR = Disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to <10 millimetres (mm).; PR = At least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters. Participants without post-baseline tumor assessments were considered non-responders. | Assessed every 3 cycles (1 cycle is 3 weeks) up to 36 months, and at least every 12 cycles thereafter, until disease progression or death. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Subgroup Analysis by Taxane Chemotherapy: Overall Response Rate (Complete Response or Partial Response) Based on Best Overall Response (Confirmed) as Assessed by the Investigator Using RECIST v1.1 | The overall response rate was defined as the percentage of participants with complete response (CR) or partial response (PR) as their best confirmed response (≥4 weeks later), as assessed by the investigator using RECIST v1.1 from the start of study treatment until disease progression/recurrence or death. Responses according to RECIST v1.1 are defined as follows: CR = Disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to <10 millimetres (mm).; PR = At least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters. Participants without post-baseline tumor assessments were considered non-responders. | Assessed every 3 cycles (1 cycle is 3 weeks) up to 36 months, and at least every 12 cycles thereafter, until disease progression or death. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Clinical Benefit Rate (CR or PR, or SD for at Least 6 Months) Based on Best Overall Response as Assessed by the Investigator Using RECIST v.1.1 | The clinical benefit rate was defined as the percentage of participants whose best confirmed response (≥4 weeks later) was a complete response (CR) or partial response (PR), or stable disease (SD) that lasted at least 6 months, as assessed by the investigator using RECIST v1.1 from the start of study treatment until disease progression/recurrence or death. Clinical benefit responses according to RECIST v1.1 are defined as follows: CR = Disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to <10 millimetres (mm).; PR = At least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters.; SD = Neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for progressive disease (PD; at least 20% increase in sum of diameters of target lesions and absolute increase of ≥5 mm), taking as reference the smallest sum diameters while on study. | Assessed every 3 cycles (1 cycle is 3 weeks) up to 36 months, and at least every 12 cycles thereafter, until disease progression. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Duration of Response as Assessed by the Investigator Using RECIST v1.1 | Duration of response (DOR) was defined as the time from when a confirmed best overall response of complete response (CR) or partial response (PR) was first documented to first documented disease progression or death from any cause (whichever occurred first). DOR was analyzed using a Kaplan-Meier approach. Participants who had not progressed or died after having had a confirmed response were censored at the date of their last tumor measurement. Response was assessed every 3 cycles (1 cycle is 3 weeks) up to 36 months, and at least every 12 cycles thereafter until event occurrence or end of study. Responses according to RECIST v1.1 are defined as follows: CR = Disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to <10 millimetres (mm).; PR = At least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters. | From date of first confirmed response (CR or PR) to first documented disease progression or death from any cause, whichever occurred first. The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Time to Response for Participants With Best Overall Response of Complete Response or Partial Response, as Assessed by the Investigator Using RECIST v1.1 | Time to response (TTR) was defined as the time from the first study treatment administration to the date of first confirmed response (CR or PR). TTR was analyzed using a Kaplan-Meier approach. Participants who did not have CR or PR were censored at the date of their last evaluable tumor assessment. Participants for whom no post-baseline tumor assessments were available were censored at Day 1. Responses according to RECIST v1.1 are defined as follows: CR = Disappearance of all target lesions. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to <10 millimetres (mm).; PR = At least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters. | From date of first study treatment until date of first confirmed response (CR or PR). The median (full range) duration of follow-up was 68.73 (0.03-87.29) months. | 
| Change From Baseline in Functional Assessment of Cancer Therapy - Breast Cancer (FACT-B) Questionnaire Total Score Over the Course of the Study | The FACT-B questionnaire (version 4) was administered only to female participants to assess quality of life in five subscales: physical, social, emotional, and functional well-being, and breast cancer. Participants were given a series of statements in each subscale and were asked to rate how true each statement was for them during the past 7 days on a 5-point scale ranging from 0 (not at all) to 4 (very much). The calculated FACT-B total score, ranging from 0 to 148, was the sum of the scores for each subscale, provided that at least 80% of the items had been answered; a higher score indicated a better quality of life. If any of the 5 subscale scores were missing, the total score was also set to missing. Baseline was defined as the last non-missing measurement taken prior to first dose of study treatment (including unscheduled assessments). Post-baseline values were summarized for planned visits only. | Baseline, every 3 cycles (1 cycle is 3 weeks) during treatment period, and 28 days post-treatment safety follow-up. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Change From Baseline in FACT-B Questionnaire Physical Well-Being Subscale Score Over the Course of the Study | The FACT-B questionnaire (version 4) was administered only to female participants to assess quality of life in five subscales: physical, social, emotional, and functional well-being, and breast cancer. For the physical well-being subscale, participants were given a series of 7 statements and were asked to rate how true each statement was for them during the past 7 days on a 5-point scale ranging from 0 (not at all) to 4 (very much). The calculated FACT-B physical well-being subscale score, ranging from 0 to 28, was the sum of the scores for each statement only if at least 50% of items had been answered; the higher the score, the better the quality of life. Baseline was defined as the last non-missing measurement taken prior to first dose of study treatment (including unscheduled assessments). Post-baseline values were summarized for planned visits only. | Baseline, every 3 cycles (1 cycle is 3 weeks) during treatment period, and 28 days post-treatment safety follow-up. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Change From Baseline in FACT-B Questionnaire Social Well-Being Subscale Score Over the Course of the Study | The FACT-B questionnaire (version 4) was administered only to female participants to assess quality of life in five subscales: physical, social, emotional, and functional well-being, and breast cancer. For the social well-being subscale, participants were given a series of 7 statements and were asked to rate how true each statement was for them during the past 7 days on a 5-point scale ranging from 0 (not at all) to 4 (very much). The calculated FACT-B social well-being subscale score, ranging from 0 to 28, was the sum of the scores for each statement only if at least 50% of items had been answered; the higher the score, the better the quality of life. Baseline was defined as the last non-missing measurement taken prior to first dose of study treatment (including unscheduled assessments). Post-baseline values were summarized for planned visits only. | Baseline, every 3 cycles (1 cycle is 3 weeks) during treatment period, and 28 days post-treatment safety follow-up. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Change From Baseline in FACT-B Questionnaire Emotional Well-Being Subscale Score Over the Course of the Study | The FACT-B questionnaire (version 4) was administered only to female participants to assess quality of life in five subscales: physical, social, emotional, and functional well-being, and breast cancer. For the emotional well-being subscale, participants were given a series of 6 statements and were asked to rate how true each statement was for them during the past 7 days on a 5-point scale ranging from 0 (not at all) to 4 (very much). The calculated FACT-B emotional well-being subscale score, ranging from 0 to 24, was the sum of the scores for each statement only if at least 50% of items had been answered; the higher the score, the better the quality of life. Baseline was defined as the last non-missing measurement taken prior to first dose of study treatment (including unscheduled assessments). Post-baseline values were summarized for planned visits only. | Baseline, every 3 cycles (1 cycle is 3 weeks) during treatment period, and 28 days post-treatment safety follow-up. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Change From Baseline in FACT-B Questionnaire Functional Well-Being Subscale Score Over the Course of the Study | The FACT-B questionnaire (version 4) was administered only to female participants to assess quality of life in five subscales: physical, social, emotional, and functional well-being, and breast cancer. For the functional well-being subscale, participants were given a series of 7 statements and were asked to rate how true each statement was for them during the past 7 days on a 5-point scale ranging from 0 (not at all) to 4 (very much). The calculated FACT-B functional well-being subscale score, ranging from 0 to 28, was the sum of the scores for each statement only if at least 50% of items had been answered; the higher the score, the better the quality of life. Baseline was defined as the last non-missing measurement taken prior to first dose of study treatment (including unscheduled assessments). Post-baseline values were summarized for planned visits only. | Baseline, every 3 cycles (1 cycle is 3 weeks) during treatment period, and 28 days post-treatment safety follow-up. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. | 
| Change From Baseline in FACT-B Questionnaire Breast Cancer Subscale Score Over the Course of the Study | The FACT-B questionnaire (version 4) was administered only to female participants to assess quality of life in five subscales: physical, social, emotional, and functional well-being, and breast cancer. For the breast cancer subscale, participants were given a series of 10 statements and were asked to rate how true each statement was for them during the past 7 days on a 5-point scale ranging from 0 (not at all) to 4 (very much). The calculated FACT-B breast cancer subscale score, ranging from 0 to 40, was the sum of the scores for each statement only if at least 50% of items had been answered; the higher the score, the better the quality of life. Baseline was defined as the last non-missing measurement taken prior to first dose of study treatment (including unscheduled assessments). Post-baseline values were summarized for planned visits only. | Baseline, every 3 cycles (1 cycle is 3 weeks) during treatment period, and 28 days post-treatment safety follow-up. The median (full range) duration of exposure to any study treatment was 16.2 (0.0-86.4) months. |