Participant-Assessed Satisfaction with Pertuzumab and Trastuzumab FDC SC, Based on Responses to Question 1 of the Therapy Administration Satisfaction Questionnaire - Subcutaneous (TASQ-SC) [ Time Frame: Cycle 3 Day 1, Cycle 6 Day 1 (each cycle is 21 days) ]
Participant-Assessed Satisfaction with Pertuzumab and Trastuzumab IV, Based on Responses to Question 1 of the Therapy Administration Satisfaction Questionnaire - Intravenous (TASQ-IV) [ Time Frame: Cycle 3 Day 1, Cycle 6 Day 1 (each cycle is 21 days) ]
Percentage of Participants Who Select Pertuzumab and Trastuzumab FDC SC for the Study Treatment Continuation Period [ Time Frame: Cycle 7 Day 1 (each cycle is 21 days) ]
Healthcare Professional (HCP) Perception of Time/Resource Use and Convenience of Each Study Regimen, Based on HCP Responses to the Healthcare Professional Questionnaire (HCPQ) - Treatment Room, by Individual Question [ Time Frame: Day 1 of Cycles 1-6 (each cycle is 21 days) ]
Healthcare Professional (HCP) Perception of Time/Resource Use and Convenience of Each Study Regimen, Based on HCP Responses to the HCPQ - Drug Preparation Room, by Individual Question [ Time Frame: Day 1 of Cycles 1-6 (each cycle is 21 days) ]
Change From Baseline Over Time in Health-Related Quality of Life (HRQoL) as Assessed by the Global Health Status/QoL Scale Score of the EORTC QLQ-C30 [ Time Frame: Baseline; Day 1 of Cycles 1, 3, 6, and 15 (or last treatment cycle; each cycle is 21 days); 1.5, 2, and 3 years (up to 3 years) ]
Change From Baseline Over Time in the Physical Functioning Scale Score of the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire 30 (EORTC QLQ-C30) [ Time Frame: Baseline; Day 1 of Cycles 1, 3, 6, and 15 (or last treatment cycle; each cycle is 21 days); 1.5, 2, and 3 years (up to 3 years) ]
Change From Baseline Over Time in the Role Functioning Scale Score of the EORTC QLQ-C30 [ Time Frame: Baseline; Day 1 of Cycles 1, 3, 6, and 15 (or last treatment cycle; each cycle is 21 days); 1.5, 2, and 3 years (up to 3 years) ]
Change From Baseline Over Time in the Emotional Functioning Scale Score of the EORTC QLQ-C30 [ Time Frame: Baseline; Day 1 of Cycles 1, 3, 6, and 15 (or last treatment cycle; each cycle is 21 days); 1.5, 2, and 3 years (up to 3 years) ]
Change From Baseline Over Time in the Cognitive Functioning Scale Score of the EORTC QLQ-C30 [ Time Frame: Baseline; Day 1 of Cycles 1, 3, 6, and 15 (or last treatment cycle; each cycle is 21 days); 1.5, 2, and 3 years (up to 3 years) ]
Change From Baseline Over Time in the Social Functioning Scale Score of the EORTC QLQ-C30 [ Time Frame: Baseline; Day 1 of Cycles 1, 3, 6, and 15 (or last treatment cycle; each cycle is 21 days); 1.5, 2, and 3 years (up to 3 years) ]
Change From Baseline Over Time in the Fatigue Scale Score of the EORTC QLQ-C30 [ Time Frame: Baseline; Day 1 of Cycles 1, 3, 6, and 15 (or last treatment cycle; each cycle is 21 days); 1.5, 2, and 3 years (up to 3 years) ]
Change From Baseline Over Time in the Nausea and Vomiting Scale Score of the EORTC QLQ-C30 [ Time Frame: Baseline; Day 1 of Cycles 1, 3, 6, and 15 (or last treatment cycle; each cycle is 21 days); 1.5, 2, and 3 years (up to 3 years) ]
Change From Baseline Over Time in the Pain Scale Score of the EORTC QLQ-C30 [ Time Frame: Baseline; Day 1 of Cycles 1, 3, 6, and 15 (or last treatment cycle; each cycle is 21 days); 1.5, 2, and 3 years (up to 3 years) ]
Change From Baseline Over Time in the Dyspnoea Scale Score of the EORTC QLQ-C30 [ Time Frame: Baseline; Day 1 of Cycles 1, 3, 6, and 15 (or last treatment cycle; each cycle is 21 days); 1.5, 2, and 3 years (up to 3 years) ]
Change From Baseline Over Time in the Insomnia Scale Score of the EORTC QLQ-C30 [ Time Frame: Baseline; Day 1 of Cycles 1, 3, 6, and 15 (or last treatment cycle; each cycle is 21 days); 1.5, 2, and 3 years (up to 3 years) ]
Change From Baseline Over Time in the Appetite Loss Scale Score of the EORTC QLQ-C30 [ Time Frame: Baseline; Day 1 of Cycles 1, 3, 6, and 15 (or last treatment cycle; each cycle is 21 days); 1.5, 2, and 3 years (up to 3 years) ]
Change From Baseline Over Time in the Constipation Scale Score of the EORTC QLQ-C30 [ Time Frame: Baseline; Day 1 of Cycles 1, 3, 6, and 15 (or last treatment cycle; each cycle is 21 days); 1.5, 2, and 3 years (up to 3 years) ]
Change From Baseline Over Time in the Diarrhoea Scale Score of the EORTC QLQ-C30 [ Time Frame: Baseline; Day 1 of Cycles 1, 3, 6, and 15 (or last treatment cycle; each cycle is 21 days); 1.5, 2, and 3 years (up to 3 years) ]
Change From Baseline Over Time in the Financial Difficulties Scale Score of the EORTC QLQ-C30 [ Time Frame: Baseline; Day 1 of Cycles 1, 3, 6, and 15 (or last treatment cycle; each cycle is 21 days); 1.5, 2, and 3 years (up to 3 years) ]
Percentage of Participants with at Least One Adverse Event [ Time Frame: Up to 3 years ]
Percentage of Participants with at Least One Grade ≥3 Adverse Event, Severity Assessed According to National Cancer Institute Common Terminology Criteria for Adverse Events version 4.0 (NCI CTCAE v4.0) [ Time Frame: Up to 3 years ]
Percentage of Participants with Heart Failure [ Time Frame: Up to 3 years ] Heart failure severity will be assessed by the New York Heart Association (NYHA) Classification System For Heart Failure and the National Cancer Institute Common Terminology Criteria for Adverse Events version 4.0 (NCI CTCAE v4.0).
Percentage of Participants with Left Ventricular Ejection Fraction (LVEF) Decreases of At Least 10 Percentage Points From Baseline and to Below 50% [ Time Frame: Baseline; Day 1 of Cycles 4, 7, and 11 (each cycle is 21 days); End of Treatment and Follow-Up visits (up to 3 years) ]
Percentage of Participants who Withdraw Prematurely from Study Treatment [ Time Frame: Up to 1 year ]
Percentage of Participants with an Adverse Event of Abnormal Targeted Vital Signs [ Time Frame: Up to 3 years ]
Percentage of Participants with an Adverse Event of Abnormal Physical Examination Findings [ Time Frame: Up to 3 years ]
Percentage of Participants with an Adverse Event of Abnormal Targeted Clinical Laboratory Test Results [ Time Frame: Up to 3 years ]
Kaplan-Meier Estimate of the Percentage of Participants in Invasive Disease-Free Survival [ Time Frame: Up to 3 years ]
Kaplan-Meier Estimate of the Percentage of Participants in Invasive Disease-Free Survival Including Second Primary Non-Breast Cancer [ Time Frame: Up to 3 years ]
Kaplan-Meier Estimate of the Percentage of Participants in Distant Disease-Free Survival [ Time Frame: Up to 3 years ]
Kaplan-Meier Estimate of the Percentage of Participants in Overall Survival [ Time Frame: Up to 3 years ]