A Study of Trastuzumab Emtansine (Trastuzumab-MCC-DM1, T-DM1) in Combination With Pertuzumab Administered to Patients With Human Epidermal Growth Factor Receptor-2 (HER2)-Positive Locally Advanced or Metastatic Breast Cancer Who Have Previously Received Trastuzumab

Hoffmann-La Roche67 enrolled

Overview

This was a multi-institutional, multinational, open-label, single-arm Phase Ib/II study designed to evaluate the safety, tolerability, pharmacokinetics, and efficacy of trastuzumab emtansine (trastuzumab-MCC-DM1) administered by intravenous (IV) infusion in combination with pertuzumab in patients with human epidermal growth factor receptor-2 (HER2)-positive locally advanced or metastatic breast cancer who had previously received trastuzumab.

There were 2 phases in the study, a Dose Escalation phase (Phase 1b) and a Dose Expansion phase (Phase 2a). In the Dose Escalation phase, 3 patients were enrolled at the first dose level (3.0 mg/kg trastuzumab emtansine) and and 6 patients were enrolled at the second dose level (3.6 mg/kg trastuzumab emtansine). An additional 58 patients were enrolled at the 3.6 mg/kg trastuzumab emtansine dose level in the Dose Expansion phase (Phase 2a) of the study.

Study Type

INTERVENTIONAL

Allocation

NON_RANDOMIZED

Purpose

TREATMENT

Masking

NONE

Enrollment

Conditions

Metastatic Breast Cancer

Interventions

Eligibility

Sex: ALLMin age: 18 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Histologically documented human epidermal growth factor receptor 2 (HER2)-positive locally advanced or metastatic breast cancer. * Tumor tissue blocks or 15-20 unstained tissue slides for confirmatory central laboratory HER2 status testing and other exploratory assessments. * Prior trastuzumab in any line of therapy. * No prior trastuzumab emtansine (T-DM1) or pertuzumab therapy. * Measurable disease. * For women of childbearing potential, agreement to use an effective form of contraception and to continue its use for the duration of the study. * Life expectancy ≥ 90 days. Exclusion Criteria: * Less than 21 days since the last anti-tumor therapy, including chemotherapy, biologic, experimental, immune, hormonal, or radiotherapy for the treatment of breast cancer, with the following exceptions: Hormone-replacement therapy or oral contraceptives; palliative radiation therapy involving ≤ 25% of marrow-bearing bone if administered ≥ 14 days prior to first study treatment. * History of intolerance or hypersensitivity to trastuzumab and/or adverse events related to trastuzumab that resulted in trastuzumab being permanently discontinued. * Peripheral neuropathy of Grade ≥ 2. * History of clinically significant cardiac dysfunction. * Current severe, uncontrolled systemic disease, eg, clinically significant cardiovascular, pulmonary, or metabolic disease. * Brain metastases that are untreated, progressive, or have required any type of therapy to control symptoms from brain metastases within 60 days of the first study treatment. * History of other malignancy within the last 5 years, except for appropriately treated carcinoma in situ of the cervix, non-melanoma skin carcinoma, or other malignancy with a similar expected curative outcome.

Locations (20)

Unnamed facility

Boca Raton, Florida, United States

Unnamed facility

Deerfield Beach, Florida, United States

Unnamed facility

Maywood, Illinois, United States

Unnamed facility

Indianapolis, Indiana, United States

Unnamed facility

Wichita, Kansas, United States

Unnamed facility

Rockville, Maryland, United States

Unnamed facility

Chapel Hill, North Carolina, United States

Unnamed facility

Philadelphia, Pennsylvania, United States

Unnamed facility

Philadelphia, Pennsylvania, United States

Unnamed facility

Nashville, Tennessee, United States

...and 10 more locations

Outcomes

Primary Outcomes

Objective Response Assessed by the Investigator Using Response Evaluation Criteria in Solid Tumors (RECIST)

A patient had an objective response if they had a complete response or a partial response on 2 consecutive occasions ≥ 4 weeks apart. For target lesions, a complete response was defined as the disappearance of all target lesions; a partial response was defined as at least a 30% decrease in the sum of the longest diameter of target lesions, taking as reference the baseline sum longest diameter. For non-target lesions, a complete response was defined as the disappearance of all non-target lesions; a partial response was defined as the persistence of 1 or more non-target lesions.

Time frame: Baseline through the end of the study (up to 2 years 3 months)

Secondary Outcomes

Duration of Objective Response Assessed by the Investigator Using Response Evaluation Criteria in Solid Tumors (RECIST)

Duration of objective response was defined as the time from initial response to disease progression (PD) or death from any cause. For target lesions, PD was defined as at least a 20% increase in the sum of the longest diameter of target lesions, taking as reference the smallest sum of the longest diameter recorded since treatment started or the appearance of 1 or more new lesions. For non-target lesions, PD was defined as the appearance of 1 or more new lesions and/or unequivocal progression of existing non-target lesions. Target lesions should be selected on the basis of their size (those with the longest diameter) and their suitability for accurate repeated measurements by imaging techniques or clinically. All measurable lesions up to a maximum of 5 lesions per organ and 10 lesions in total, representative of all involved organs, should be identified as target lesions.

Time frame: Baseline through the end of the study (up to 2 years 3 months)

Progression-free Survival Assessed by the Investigator Using Response Evaluation Criteria in Solid Tumors (RECIST)

Progression-free survival was defined as the time from randomization to first documented disease progression (PD) or death due to any cause within 30 days of the last treatment, whichever occurred first. For target lesions, PD was defined as at least a 20% increase in the sum of the longest diameter of target lesions, taking as reference the smallest sum of the longest diameter recorded since treatment started or the appearance of 1 or more new lesions. For non-target lesions, PD was defined as the appearance of 1 or more new lesions and/or unequivocal progression of existing non-target lesions. Target lesions should be selected on the basis of their size (those with the longest diameter) and their suitability for accurate repeated measurements by imaging techniques or clinically. All measurable lesions up to a maximum of 5 lesions per organ and 10 lesions in total, representative of all involved organs, should be identified as target lesions.

Time frame: Baseline through the end of the study (up to 2 years 3 months)