| Primary | Progression-Free Survival (PFS) | PFS was defined as the time from randomization to the first occurrence of disease progression or death from any cause, whichever occurred first, on the basis of investigator assessments. Progression was defined according to Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 as at least a 20% increase in the sum of diameters of target lesions with an absolute increase of at least 5 millimeter (mm) or the appearance of one or more new lesions. | The intent-to-treat (ITT) population included all randomized participants grouped according to the treatment assigned at randomization. | Posted | | Median | 95% Confidence Interval | months | | At time of clinical data cut-off (up to 20 months) | | | | ID | Title | Description |
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| OG000 | Arm A: Trastuzumab Emtansine | Participants were administered trastuzumab emtansine once every three weeks (Q3W). Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab Emtansine: Trastuzumab emtansine 3.6 milligrams/kilogram (mg/kg) was administered intravenously (IV) over 30-90 minutes Q3W. | | OG001 | Arm B: Trastuzumab + Docetaxel | Participants were administered trastuzumab plus docetaxel Q3W. Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab: For the first three-week cycle, trastuzumab was administered IV at 8 mg/kg. For subsequent cycles, trastuzumab was administered IV at 6 mg/kg Q3W. Docetaxel: Docetaxel was administered IV at either 75 milligrams/square meter (mg/m^2) or 100 mg/m^2 Q3W. |
| | | Title | Denominators | Categories |
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| | | Title | Measurements |
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| - OG00010.3(4.2 to NA)Not Available (NA) = parameter not estimable due to small number of participants included in analysis
- OG0018.2(6.0 to 13.8)
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| Primary | Safety: Percentage of Participants With Adverse Events (AEs) | An adverse event is any untoward medical occurrence in a participant administered a pharmaceutical product and which does not necessarily have to have a causal relationship with the treatment. An adverse event can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding, for example), symptom, or disease temporally associated with the use of a pharmaceutical product, whether or not considered related to the pharmaceutical product. Preexisting conditions which worsen during a study are also considered as adverse events. | The safety analysis population consisted of all participants who received at least one dose of study drug. Safety analyses were based on the treatment that participants actually received. | Posted | | Number | | percentage of participants | | At time of clinical data cut-off (up to 20 months) | | | | ID | Title | Description |
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| OG000 | Arm A: Trastuzumab Emtansine | Participants were administered trastuzumab emtansine once every three weeks (Q3W). Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab Emtansine: Trastuzumab emtansine 3.6 milligrams/kilogram (mg/kg) was administered intravenously (IV) over 30-90 minutes Q3W. | | OG001 | Arm B: Trastuzumab + Docetaxel | Participants were administered trastuzumab plus docetaxel Q3W. Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab: For the first three-week cycle, trastuzumab was administered IV at 8 mg/kg. For subsequent cycles, trastuzumab was administered IV at 6 mg/kg Q3W. Docetaxel: Docetaxel was administered IV at either 75 milligrams/square meter (mg/m^2) or 100 mg/m^2 Q3W. |
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| Primary | Safety: Percentage of Participants With Grade 3 and 4 AEs | Grade 3 and 4 AEs were evaluated according to National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) v4.0. Grade 3 was defined as severe or medically significant but not immediately life-threatening; hospitalization or prolongation of hospitalization indicated; disabling; limiting self care activities of daily living, including bathing, dressing and undressing, feeding self, using the toilet, taking medications, and not bedridden. Grade 4 was defined as life-threatening consequences; urgent intervention indicated. | The safety analysis population consisted of all participants who received at least one dose of study drug. Safety analyses were based on the treatment that participants actually received. | Posted | | Number | | percentage of participants | | At time of clinical data cut-off (up to 20 months) | | | | ID | Title | Description |
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| OG000 | Arm A: Trastuzumab Emtansine | Participants were administered trastuzumab emtansine once every three weeks (Q3W). Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab Emtansine: Trastuzumab emtansine 3.6 milligrams/kilogram (mg/kg) was administered intravenously (IV) over 30-90 minutes Q3W. | | OG001 | Arm B: Trastuzumab + Docetaxel | Participants were administered trastuzumab plus docetaxel Q3W. Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab: For the first three-week cycle, trastuzumab was administered IV at 8 mg/kg. For subsequent cycles, trastuzumab was administered IV at 6 mg/kg Q3W. Docetaxel: Docetaxel was administered IV at either 75 milligrams/square meter (mg/m^2) or 100 mg/m^2 Q3W. |
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| Primary | Percentage of Participants With Adverse Events Leading to Treatment Discontinuation | | The safety analysis population consisted of all participants who received at least one dose of study drug. Safety analyses were based on the treatment that participants actually received. | Posted | | Number | | percentage of participants | | At time of clinical data cut-off (up to 20 months) | | | | ID | Title | Description |
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| OG000 | Arm A: Trastuzumab Emtansine | Participants were administered trastuzumab emtansine once every three weeks (Q3W). Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab Emtansine: Trastuzumab emtansine 3.6 milligrams/kilogram (mg/kg) was administered intravenously (IV) over 30-90 minutes Q3W. | | OG001 | Arm B: Trastuzumab + Docetaxel | Participants were administered trastuzumab plus docetaxel Q3W. Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab: For the first three-week cycle, trastuzumab was administered IV at 8 mg/kg. For subsequent cycles, trastuzumab was administered IV at 6 mg/kg Q3W. Docetaxel: Docetaxel was administered IV at either 75 milligrams/square meter (mg/m^2) or 100 mg/m^2 Q3W. |
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| Primary | Safety: Percentage of Participants With Adverse Events Leading to Treatment Interruption | | The safety analysis population consisted of all participants who received at least one dose of study drug. Safety analyses were based on the treatment that participants actually received. | Posted | | Number | | percentage of participants | | At time of clinical data cut-off (up to 20 months) | | | | ID | Title | Description |
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| OG000 | Arm A: Trastuzumab Emtansine | Participants were administered trastuzumab emtansine once every three weeks (Q3W). Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab Emtansine: Trastuzumab emtansine 3.6 milligrams/kilogram (mg/kg) was administered intravenously (IV) over 30-90 minutes Q3W. | | OG001 | Arm B: Trastuzumab + Docetaxel | Participants were administered trastuzumab plus docetaxel Q3W. Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab: For the first three-week cycle, trastuzumab was administered IV at 8 mg/kg. For subsequent cycles, trastuzumab was administered IV at 6 mg/kg Q3W. Docetaxel: Docetaxel was administered IV at either 75 milligrams/square meter (mg/m^2) or 100 mg/m^2 Q3W. |
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| Primary | Safety: Percentage of Participants With Adverse Events Leading to Dose Reduction | | The safety analysis population consisted of all participants who received at least one dose of study drug. Safety analyses were based on the treatment that participants actually received. | Posted | | Number | | percentage of participants | | At time of clinical data cut-off (up to 20 months) | | | | ID | Title | Description |
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| OG000 | Arm A: Trastuzumab Emtansine | Participants were administered trastuzumab emtansine once every three weeks (Q3W). Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab Emtansine: Trastuzumab emtansine 3.6 milligrams/kilogram (mg/kg) was administered intravenously (IV) over 30-90 minutes Q3W. | | OG001 | Arm B: Trastuzumab + Docetaxel | Participants were administered trastuzumab plus docetaxel Q3W. Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab: For the first three-week cycle, trastuzumab was administered IV at 8 mg/kg. For subsequent cycles, trastuzumab was administered IV at 6 mg/kg Q3W. Docetaxel: Docetaxel was administered IV at either 75 milligrams/square meter (mg/m^2) or 100 mg/m^2 Q3W. |
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| Primary | Safety: Percentage of Participants With Significant Decline in Left Ventricular Ejection Fraction (LVEF) | Significant decline in LVEF was defined as LVEF below 50% and decrease from baseline of 15% points or more. Echocardiogram or multiple-gated acquisition (MUGA) scan was used to assess LVEF. | The safety analysis population consisted of all participants who received at least one dose of study drug. Safety analyses were based on the treatment that participants actually received. | Posted | | Number | | percentage of participants | | At time of clinical data cut-off (up to 20 months) | | | | ID | Title | Description |
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| OG000 | Arm A: Trastuzumab Emtansine | Participants were administered trastuzumab emtansine once every three weeks (Q3W). Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab Emtansine: Trastuzumab emtansine 3.6 milligrams/kilogram (mg/kg) was administered intravenously (IV) over 30-90 minutes Q3W. | | OG001 | Arm B: Trastuzumab + Docetaxel | Participants were administered trastuzumab plus docetaxel Q3W. Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab: For the first three-week cycle, trastuzumab was administered IV at 8 mg/kg. For subsequent cycles, trastuzumab was administered IV at 6 mg/kg Q3W. Docetaxel: Docetaxel was administered IV at either 75 milligrams/square meter (mg/m^2) or 100 mg/m^2 Q3W. |
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| Secondary | Overall Survival (OS) | OS was defined as the time from the date of randomization to the date of death from any cause. | The ITT population included all randomized participants grouped according to the treatment assigned at randomization. | Posted | | Median | 95% Confidence Interval | months | | At time of clinical data cut-off (up to 20 months) | | | | ID | Title | Description |
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| OG000 | Arm A: Trastuzumab Emtansine | Participants were administered trastuzumab emtansine once every three weeks (Q3W). Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab Emtansine: Trastuzumab emtansine 3.6 milligrams/kilogram (mg/kg) was administered intravenously (IV) over 30-90 minutes Q3W. | | OG001 | Arm B: Trastuzumab + Docetaxel | Participants were administered trastuzumab plus docetaxel Q3W. Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab: For the first three-week cycle, trastuzumab was administered IV at 8 mg/kg. For subsequent cycles, trastuzumab was administered IV at 6 mg/kg Q3W. Docetaxel: Docetaxel was administered IV at either 75 milligrams/square meter (mg/m^2) or 100 mg/m^2 Q3W. |
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| Secondary | One-Year Survival Rate | One-year survival rate as determined by Kaplan-Meier estimates. | The ITT population included all randomized participants grouped according to the treatment assigned at randomization. Participants, for whom data were collected, are included in the analysis for this outcome measure. | Posted | | Median | 95% Confidence Interval | percentage of participants | | At 12 months | | | | ID | Title | Description |
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| OG000 | Arm A: Trastuzumab Emtansine | Participants were administered trastuzumab emtansine once every three weeks (Q3W). Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab Emtansine: Trastuzumab emtansine 3.6 milligrams/kilogram (mg/kg) was administered intravenously (IV) over 30-90 minutes Q3W. | | OG001 | Arm B: Trastuzumab + Docetaxel | Participants were administered trastuzumab plus docetaxel Q3W. Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab: For the first three-week cycle, trastuzumab was administered IV at 8 mg/kg. For subsequent cycles, trastuzumab was administered IV at 6 mg/kg Q3W. Docetaxel: Docetaxel was administered IV at either 75 milligrams/square meter (mg/m^2) or 100 mg/m^2 Q3W. |
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| Secondary | OS Truncated at 2 Years | OS truncated at 2 years was defined as the time from the date of randomization to the date of death from any cause, with deaths occurring beyond 2 years after the participant's randomization date censored at 2 years. | Data for this outcome measure were not collected and are therefore not reported. The study was terminated before the time point for data collection of this outcome measure. | Posted | | | | | | At 24 months | | | | ID | Title | Description |
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| OG000 | Arm A: Trastuzumab Emtansine | Participants were administered trastuzumab emtansine once every three weeks (Q3W). Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab Emtansine: Trastuzumab emtansine 3.6 milligrams/kilogram (mg/kg) was administered intravenously (IV) over 30-90 minutes Q3W. | | OG001 | Arm B: Trastuzumab + Docetaxel | Participants were administered trastuzumab plus docetaxel Q3W. Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab: For the first three-week cycle, trastuzumab was administered IV at 8 mg/kg. For subsequent cycles, trastuzumab was administered IV at 6 mg/kg Q3W. Docetaxel: Docetaxel was administered IV at either 75 milligrams/square meter (mg/m^2) or 100 mg/m^2 Q3W. |
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| Secondary | Objective Response Rate (ORR) | ORR was defined as percentage of participants with partial response (PR) or complete response (CR) determined on the basis of investigator assessments with the use of RECIST v1.1. Tumor assessments were performed with computed tomography (CT) or magnetic resonance imaging (MRI) scans of the chest, abdomen, and pelvis. CR: disappearance of all target lesions; PR: >=30% decrease in the sum of the longest diameter of target lesions; Objective Response Rate (OR) = CR + PR. | The ITT population included all randomized participants grouped according to the treatment assigned at randomization. Participants, for whom data were collected, are included in the analysis for this outcome measure. | Posted | | Number | 95% Confidence Interval | percentage of participants | | At time of clinical data cut-off (up to 20 months) | | | | ID | Title | Description |
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| OG000 | Arm A: Trastuzumab Emtansine | Participants were administered trastuzumab emtansine once every three weeks (Q3W). Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab Emtansine: Trastuzumab emtansine 3.6 milligrams/kilogram (mg/kg) was administered intravenously (IV) over 30-90 minutes Q3W. | | OG001 | Arm B: Trastuzumab + Docetaxel | Participants were administered trastuzumab plus docetaxel Q3W. Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab: For the first three-week cycle, trastuzumab was administered IV at 8 mg/kg. For subsequent cycles, trastuzumab was administered IV at 6 mg/kg Q3W. Docetaxel: Docetaxel was administered IV at either 75 milligrams/square meter (mg/m^2) or 100 mg/m^2 Q3W. |
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| Secondary | Duration of Response (DOR) | DOR was defined as the time from the date of initial confirmed PR or CR to the date of disease progression or death within the study. CR: disappearance of all target lesions; PR: >=30% decrease in the sum of the longest diameter of target lesions. Disease progression was defined according to RECIST, v1.1 as at least a 20% increase in the sum of diameters of target lesions with an absolute increase of at least 5 mm or the appearance of one or more new lesions. | The ITT population included all randomized participants grouped according to the treatment assigned at randomization. Participants, for whom data were collected, are included in the analysis for this outcome measure. | Posted | | Median | 95% Confidence Interval | months | | At time of clinical data cut-off (up to 20 months) | | | | ID | Title | Description |
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| OG000 | Arm A: Trastuzumab Emtansine | Participants were administered trastuzumab emtansine once every three weeks (Q3W). Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab Emtansine: Trastuzumab emtansine 3.6 milligrams/kilogram (mg/kg) was administered intravenously (IV) over 30-90 minutes Q3W. | | OG001 | Arm B: Trastuzumab + Docetaxel | Participants were administered trastuzumab plus docetaxel Q3W. Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab: For the first three-week cycle, trastuzumab was administered IV at 8 mg/kg. For subsequent cycles, trastuzumab was administered IV at 6 mg/kg Q3W. Docetaxel: Docetaxel was administered IV at either 75 milligrams/square meter (mg/m^2) or 100 mg/m^2 Q3W. |
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| Secondary | Pharmacokinetics: Serum Concentrations of Study Medications | Pharmacokinetic (PK) parameters were to be determined in a subset of participants. PK samples from the first 100 Chinese participants were planned to be collected. | No PK analyses were performed as no participants were enrolled from China and no samples were collected. | Posted | | | | | | Day 1, Cycle 1 (Day 1), Day 1, Cycle 2 (Day 22), Day 1, Cycle 4 (Day 64) and at study drug completion or discontinuation visit (up to 20 months) | | | | ID | Title | Description |
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| OG000 | Arm A: Trastuzumab Emtansine | Participants were administered trastuzumab emtansine once every three weeks (Q3W). Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab Emtansine: Trastuzumab emtansine 3.6 milligrams/kilogram (mg/kg) was administered intravenously (IV) over 30-90 minutes Q3W. | | OG001 | Arm B: Trastuzumab + Docetaxel | Participants were administered trastuzumab plus docetaxel Q3W. Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab: For the first three-week cycle, trastuzumab was administered IV at 8 mg/kg. For subsequent cycles, trastuzumab was administered IV at 6 mg/kg Q3W. Docetaxel: Docetaxel was administered IV at either 75 milligrams/square meter (mg/m^2) or 100 mg/m^2 Q3W. |
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| Secondary | Immunogenicity: Percentage of Positive Anti-Therapeutic Antibody (ATA) Response to Trastuzumab Emtansine | | The ITT population included all randomized participants grouped according to the treatment assigned at randomization. Only participants with at least one post-dose sample available for ATA analysis were analyzed for this outcome measure. | Posted | | Number | | percentage of participants | | Day 1, Cycle 1 (Day 1), Day 1, Cycle 4 (Day 64) and at study drug completion or discontinuation visit (up to 20 months) | | | | ID | Title | Description |
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| OG000 | Arm A: Trastuzumab Emtansine | Participants were administered trastuzumab emtansine once every three weeks (Q3W). Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab Emtansine: Trastuzumab emtansine 3.6 milligrams/kilogram (mg/kg) was administered intravenously (IV) over 30-90 minutes Q3W. |
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| Secondary | Patient-Reported Outcomes: Number of Participants Who Completed the Functional Assessment of Cancer Therapy-Breast Cancer (FACT-B) Questionnaire | The FACT-B (version 4) is a self-reported instrument which measures health-related quality of life (HRQOL) of participants with breast cancer.The FACT-B includes the breast cancer sub-scale (BCS) and is comprised of nine items specific to assessing patients' HRQOL in breast cancer. | The ITT population included all randomized participants grouped according to the treatment assigned at randomization. | Posted | | Count of Participants | | Participants | | On the first Day of each 21-day Cycle (Day 1, 22, 43, etc.) and at study drug completion or discontinuation visit (up to 20 months) | | | | ID | Title | Description |
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| OG000 | Arm A: Trastuzumab Emtansine | Participants were administered trastuzumab emtansine once every three weeks (Q3W). Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab Emtansine: Trastuzumab emtansine 3.6 milligrams/kilogram (mg/kg) was administered intravenously (IV) over 30-90 minutes Q3W. | | OG001 | Arm B: Trastuzumab + Docetaxel | Participants were administered trastuzumab plus docetaxel Q3W. Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab: For the first three-week cycle, trastuzumab was administered IV at 8 mg/kg. For subsequent cycles, trastuzumab was administered IV at 6 mg/kg Q3W. Docetaxel: Docetaxel was administered IV at either 75 milligrams/square meter (mg/m^2) or 100 mg/m^2 Q3W. |
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| Secondary | Patient-Reported Outcomes: Number of Participants Who Completed the FACT-Taxane Questionnaire | The FACT - Taxane is a self-reported instrument which measures the HRQOL of participants receiving taxane containing chemotherapy. The FACT-Taxane consists of 16 items and was designed to assess the impact of taxane treatment-related symptoms from the participant's perspective. | The ITT population included all randomized participants grouped according to the treatment assigned at randomization. | Posted | | Count of Participants | | Participants | | Days 1 and 8 of Cycles 1 and 2 and on the first day of each subsequent 21-day cycle thereafter as well as at study drug completion or discontinuation visit (up to 20 months) | | | | ID | Title | Description |
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| OG000 | Arm A: Trastuzumab Emtansine | Participants were administered trastuzumab emtansine once every three weeks (Q3W). Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab Emtansine: Trastuzumab emtansine 3.6 milligrams/kilogram (mg/kg) was administered intravenously (IV) over 30-90 minutes Q3W. | | OG001 | Arm B: Trastuzumab + Docetaxel | Participants were administered trastuzumab plus docetaxel Q3W. Participants could remain on study treatment until investigator assessed disease progression, unacceptable toxicity, or Sponsor study termination occurs, whichever occurs first. Trastuzumab: For the first three-week cycle, trastuzumab was administered IV at 8 mg/kg. For subsequent cycles, trastuzumab was administered IV at 6 mg/kg Q3W. Docetaxel: Docetaxel was administered IV at either 75 milligrams/square meter (mg/m^2) or 100 mg/m^2 Q3W. |
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