Breast Neoplasms
Conditions
Interventions
Intervention
Drug: Abemaciclib
Administered orally.
Other Name: LY2835219
Drug: Standard Adjuvant ET
Administered according to label instructions.
Drug: Placebo
Administered orally.
Study Arms
-Exper
Sponsors
Masaki Takeshi
Eligibility
Sex/Gender
All
Inclusion criteria
Inclusion criteria: - Have confirmed HR+, HER2+ early invasive breast cancer without evidence of disease recurrence or distant metastases - Have undergone definitive surgery of the primary breast tumor(s) - Have tumor tissue from breast (preferred) or lymph node - Have received a minimum of four cycles of chemotherapy in either the neoadjuvant or adjuvant setting per standard of care - Have completed approximately nine to 20 months of standard HER2-targeted therapy (neoadjuvant/adjuvant combined duration) - Have received one of the following eligible HER2-targeted adjuvant regimens AND be randomized within 12 weeks of completing the regimen: - For participants treated with neoadjuvant therapy (chemotherapy administered with HER2-targeted therapy: Single agent adjuvant ado-trastuzumab emtansine or - For participants not treated with neoadjuvant therapy: Adjuvant pertuzumab with trastuzumab - Have high risk disease, defined by one of the following: - For participants treated with neoadjuvant therapy (as defined above): Pathologically detected axillary nodal disease in the surgical specimen - residual disease in at least one axillary lymph node, or - a residual tumor >= 5 cm, or - a residual tumor of any size that has direct extension to the chest wall and/or skin (ulceration or skin nodules). - Those who had definitive surgery prior to systemic therapy and completed adjuvant chemotherapy along with HER2-targeted therapies (trastuzumab and pertuzumab) must have - tumor involvement in >=4 ipsilateral axillary lymph nodes, or - tumor involvement in 1 to 3 ipsilateral axillary lymph node(s) and histological Grade 3, or - primary invasive tumor size of >= 5 cm on pathological evaluation.
Exclusion criteria
Exclusion criteria: -Have breast cancer with any of the following features: -Disease recurrence or distant metastatic disease (including contralateral axillary lymph nodes) -Pathological complete response from any prior early breast cancer treatments. Participants are required to have residual primary tumor and/or lymph node disease at the time of definitive surgery as indicated in inclusion criteria -Inflammatory breast cancer -Have other medical conditions including: -Previous breast cancer (Exceptions: Ipsilateral ductal carcinoma in situ [DCIS] treated by locoregional therapy alone >=5 years ago; contralateral DCIS treated by locoregional therapy at any time) -Other cancer being treated and/or not in complete remission within the last 5 years (Exceptions: Appropriately treated non-melanomatous skin cancer or carcinoma in situ of cervix, bladder, or colon) -Females who are pregnant or lactating -History of venous thromboembolism -Other serious medical conditions -Have previously received treatment with: -Any cyclin-dependent kinase (CDK)4 and CDK6 inhibitor -Prior adjuvant treatment with immunotherapy, tucatinib, neratinib, any investigational HER2 directed therapy, or T-DXd (DS8201) for treatment of breast cancer -Endocrine therapy (ET) (i.e., tamoxifen, raloxifene or aromatase inhibitor) for breast cancer prevention (without diagnosis of breast cancer) -Additional chemotherapy, anti-cancer ET, or HER2-targeted therapy beyond standard of care at study enrollment
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Invasive Disease Free Survival (IDFS) [ Time Frame: Randomization to Recurrence or Death from Any Cause (up to 10 Years) ] IDFS as defined by the STEEP System | — |
Countries
Argentina, Australia, Austria, Belgium, Brazil, China, Finland, France, Germany, Greece, Hungary, Israel, Italy, Japan, Korea, Mexico, Puerto Rico, Romania, Russian Federation, Spain, Switzerland, Taiwan, United Kingdom, United States
Contacts
Public ContactTrial Guide Call Center
Eli Lilly Japan K.K.
Outcome results
None listed