A Study of Nonsteroidal Aromatase Inhibitors Plus Abemaciclib (LY2835219) in Postmenopausal Women With Breast Cancer

Study Overview
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Brief Summary
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The main purpose of this study is to evaluate how effective nonsteroidal aromatase inhibitors (NSAI) plus abemaciclib are in postmenopausal women with breast cancer. Participants will be randomized to abemaciclib or placebo in a 2:1 ratio.

Official Title
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A Randomized, Double-Blind, Placebo-Controlled, Phase 3 Study of Nonsteroidal Aromatase Inhibitors (Anastrozole or Letrozole) Plus LY2835219, a CDK4/6 Inhibitor, or Placebo in Postmenopausal Women With Hormone Receptor-Positive, HER2-Negative Locoregionally Recurrent or Metastatic Breast Cancer With No Prior Systemic Therapy in This Disease Setting

Conditions
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Breast Cancer

Intervention / Treatment
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* Drug: Abemaciclib
* Drug: Anastrozole
* Drug: Letrozole
* Drug: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Have a diagnosis of hormone receptor-positive (HR+), human epidermal growth factor receptor 2-negative (HER2-) breast cancer Have locoregionally recurrent disease not amenable to resection or radiation therapy with curative intent or metastatic disease Have postmenopausal status Have either measurable disease or nonmeasurable bone-only disease Have a performance status ≤1 on the Eastern Cooperative Oncology Group (ECOG) scale Have adequate organ function Have discontinued previous localized radiotherapy for palliative purposes or for lytic lesions at risk of fracture prior to randomization and recovered from the acute effects of therapy Are able to swallow capsules Exclusion Criteria: Have visceral crisis, lymphangitic spread, or leptomeningeal carcinomatosis Have inflammatory breast cancer Have clinical evidence or a history of central nervous system (CNS) metastasis Are currently receiving or have previously received endocrine therapy for locoregionally recurrent or metastatic breast cancer Have received prior (neo)adjuvant endocrine therapy with a disease-free interval ≤12 months from completion of treatment Are currently receiving or have previously received chemotherapy for locoregionally recurrent or metastatic breast cancer Have received prior treatment with everolimus Have received prior treatment with any cyclin-dependent kinase (CDK) 4/6 inhibitor (or participated in any CDK4/6 inhibitor clinical trial for which treatment assignment is still blinded) Have initiated bisphosphonates or approved receptor activator of nuclear factor kappa-B ligand (RANK-L) targeted agents <7 days prior to randomization Are currently receiving an investigational drug in a clinical trial or participating in any other type of medical research judged not to be scientifically or medically compatible with this study Have received treatment with a drug that has not received regulatory approval for any indication within 14 or 21 days of randomization for a nonmyelosuppressive or myelosuppressive agent, respectively Have had major surgery within 14 days prior to randomization

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Abemaciclib + NSAI<br>150 milligrams (mg) Abemaciclib orally every 12 hours plus either 1 mg anastrozole or 2.5 mg letrozole orally once daily for 28 days (28 day cycles). | Drug: Abemaciclib<br>* Administered orally<br>* Other names: LY2835219;Drug: Anastrozole<br>* Administered orally<br>Drug: Letrozole<br>* Administered orally<br>|
| Placebo Comparator: Placebo + NSAI<br>Placebo orally every 12 hours plus either 1 mg anastrozole or 2.5 mg letrozole orally once daily for 28 days (28 day cycles). | Drug: Anastrozole<br>* Administered orally<br>Drug: Letrozole<br>* Administered orally<br>Drug: Placebo<br>* Administered orally<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Progression Free Survival (PFS) | PFS defined as the time from the first day of therapy to the first evidence of disease progression as defined by RECIST v1.1 or death from any cause. Progressive Disease (PD) was at least a 20% increase in the sum of the diameters of target lesions, with reference being the smallest sum on study and an absolute increase of at least 5 mm, or unequivocal progression of non-target lesions, or 1 or more new lesions. If a participant does not have a complete baseline disease assessment, then the PFS time was censored at the date of randomization, regardless of whether or not objectively determined disease progression or death has been observed for the participant. If a participant was not known to have died or have objective progression as of the data inclusion cutoff date for the analysis, the PFS time was censored at the last adequate tumor assessment date. | Randomization to Progressive Disease or Death Due to Any Cause (Up to 32 Months) | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Overall Survival (OS) | OS defined as the time from first dose date to the date of death due to any cause. For each participant who is not known to have died as of the data-inclusion cutoff date for overall survival analysis, OS time was censored on the last date the participant is known to be alive. | Randomization to Progressive Disease or Death Due to Any Cause (Estimated Up to 82 Months) | 
| Percentage of Participants With Complete Response (CR) or Partial Response (PR) (Objective Response Rate [ORR]) | ORR was the percentage of participants achieving a best overall response (BOR) of complete response (CR) or partial response (PR) as per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1. CR defined as the disappearance of all target and non-target lesions and no appearance of new lesions. PR defined as at least a 30% decrease in the sum of the longest diameters (LD) of target lesions (taking as reference the baseline sum LD), no progression of non-target lesions, and no appearance of new lesions. | Randomization to Progressive Disease or Death Due to Any Cause (Up to 32 Months) | 
| Duration of Response (DoR) | DOR was the time from the date of first evidence of complete response or partial response to the date of objective progression or the date of death due to any cause, whichever is earlier. CR and PR were defined using the RECIST v1.1. CR defined as the disappearance of all target and non-target lesions and no appearance of new lesions. PR defined as at least a 30% decrease in the sum of the LD of target lesions (taking as reference the baseline sum LD), no progression of non-target lesions, and no appearance of new lesions. If a responder was not known to have died or have objective progression as of the data inclusion cutoff date, duration of response was censored at the last adequate tumor assessment date. | CR or PR to Disease Progression or Death Due to Any Cause (Up to 32 Months) | 
| Percentage of Participants With CR, PR or Stable Disease (SD) (Disease Control Rate [DCR]) | DCR was the percentage of participants with a best overall response of CR, PR, or SD as per response using RECIST v1.1 criteria. CR defined as the disappearance of all target and non-target lesions and no appearance of new lesions. PR defined as at least a 30% decrease in the sum of the LD of target lesions (taking as reference the baseline sum LD), no progression of non-target lesions, and no appearance of new lesions. SD was neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for PD for target lesions, no progression of non-target lesions, and no appearance of new lesions. | Randomization to Progressive Disease or Death Due to Any Cause (Up to 32 Months) | 
| Percentage of Participants With Tumor Response of SD for at Least 6 Months, PR, or CR (Clinical Benefit Rate [CBR]) | CBR defined as percentage of participants with best overall response of CR, PR, or SD with a duration of at least 6 months. CR, PR, or SD were defined using RECIST v1.1 criteria. CR defined as the disappearance of all target and non-target lesions and no appearance of new lesions. PR defined as at least a 30% decrease in the sum of the LD of target lesions (taking as reference the baseline sum LD), no progression of non-target lesions, and no appearance of new lesions. SD was neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for PD for target lesions, no progression of non-target lesions, and no appearance of new lesions. Percentage of participants = (participants with CR+PR+SD with a duration of at least 6 months / number of participants enrolled) * 100. | Randomization to Progressive Disease or Death Due to Any Cause (Up to 32 Months) | 
| Change From Baseline to End of Study in Symptom Burden on the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire-Core 30 (EORTC QLQ-C30) Functional Scale Scores | EORTC QLQ-C30 v3.0 is a self-administered questionnaire with multidimensional scales that measures 5 functional domains(physical,role,cognitive,emotional, and social),global health status, and symptom scales of fatigue, pain, nausea and vomiting,dyspnea,loss of appetite,insomnia,constipation and diarrhea, and financial difficulties.Functional scale options are defined on a 7-point scale ranging from 1, Very poor to 7, Excellent. A linear transformation is applied to standardize the raw scores to range between 0 and 100 with higher score indicating better functioning. For functional domains and global health status, higher scores represent a better level of functioning. Least Square(LS) Mean was calculated using Mixed Model Repeated Measures (MMRM) model with treatment, Visit, Treatment*Visit and Baseline. | Baseline, End of Study (Up to 32 Months) | 
| Change From Baseline to End of Study in Symptom Burden on the EORTC QLQ-C30 Symptom Scale Scores | EORTC QLQ-C30 v3.0 is a self-administered questionnaire with multidimensional scales that measures 5 functional domains (physical, role, cognitive, emotional, and social), global health status, and symptom scales of fatigue, pain, nausea and vomiting, dyspnea, loss of appetite, insomnia, constipation and diarrhea, and financial difficulties. Symptom scale ranges from: 1, Not at all; 2, A little; 3, Quite a bit; to 4, Very much. A linear transformation is applied to standardize the raw scores to range between 0 and 100 per developer guidelines. For symptoms scales, higher scores indicated greater symptom burden. Least Square(LS) Mean was calculated using Mixed Model Repeated Measures (MMRM) model with treatment, Visit, Treatment*Visit and Baseline. Small changes are generally defined as at least a 3, 4 or 5 point change from baseline. | Baseline, End of Study (Up to 32 Months) | 
| Change From Baseline to End of Study in Symptom Burden on the EORTC QLQ-Breast23 Questionnaire | The EORTC-QLQ-BR23 is a 23-item breast cancer-specific companion module to the EORTC-QLQ-C30 and consists of four functional scales (body image, sexual functioning, sexual enjoyment, future perspective) and four symptom scales (systemic side effects, breast symptoms, arm symptoms, upset by hair loss). QLQ-BR23 questionnaire employs 4-point scales with responses from: 1, Not at all; 2, A little; 3, Quite a bit; to 4, Very much. All scores are converted to a 0 to 100 scale. A higher score representing a higher (better) level of functioning (BR23: body image, sexual functioning, future perspective), or a higher (worse) level of symptoms. Least Square (LS) Mean was calculated using Mixed Model Repeated Measures (MMRM) model with treatment, Visit, Treatment*Visit and Baseline. | Baseline, End of Study (Up to 32 Months) | 
| Change From Baseline to End of Study in Health Status on the EuroQuol 5-Dimension 5 Level (EuroQol-5D 5L) Index Value | The EuroQol-5D (version 5L) is a brief self-administered, validated instrument consisting of 2 parts.The first part consists of 5 descriptors of current health state (mobility, self care, usual activities, pain/discomfort, and anxiety/ depression); a participant is asked to rate each state on a five level scale (no problem, slight problem, moderate problem, severe problem and extreme problem) with higher levels indicating greater severity/ impairment. Published weights are available that allow for the creation of a single summary score called the EQ-5D index that ranges from 0 to 1, with low scores representing a higher level of dysfunction and 1 as perfect health. Minimally important differences in the EQ-5D index score are 0.06 or greater in cancer patients. Least Square(LS) Mean was calculated using Mixed Model Repeated Measures (MMRM) model with treatment, Visit, Treatment*Visit and Baseline. | Baseline, End of Study (Up to 32 Months) | 
| Change From Baseline to End of Study in Health Status on the EuroQol-5D 5L Visual Analog Scale (VAS) Scores Scale | The EuroQol-5D (version 5L) is a brief self-administered, validated instrument consisting of 2 parts. The second part consists of the EQ-5D general health status as measured by a visual analog scale (EQ-5D VAS). EQ-5D VAS measures the participant's self-rated health status on a scale from 0 (worst imaginable health state) to 100 (best imaginable health state). Minimally important differences in the EQ-5D VAS score are 7 or greater in cancer patients. Least Square(LS) Mean was calculated using Mixed Model Repeated Measures (MMRM) model with treatment, Visit, Treatment*Visit and Baseline. | Baseline, End of Study (Up to 32 Months) | 
| Pharmacokinetics (PK): Area Under the Plasma Concentration-Time Curve From Time 0 Hour to Infinity [AUC(0-∞)] of Abemaciclib and Its Metabolites M2 and M20 | Pharmacokinetics (PK): Area Under the Plasma Concentration-Time Curve From Time 0 Hour to Infinity [AUC(0-∞)] of Abemaciclib and Its Metabolites M2 and M20 | Cycle 1 Day 1; 2 to 4 hours (h) post dose, Cycle 2 Day 1; 3 h post dose; 7 h post dose, Cycle 3 Day 1; pre dose, 3 h post dose | 
| PK: Hepatic Clearance of Abemaciclib, and Apparent Hepatic Clearance of Its Metabolites M2 and M20 | PK: Hepatic Clearance of Abemaciclib, and apparent hepatic clearance of its Metabolites M2 and M20 | Cycle 1 Day 1; 2 to 4 hours (h) post dose, Cycle 2 Day 1; 3 h post dose; 7 h post dose, Cycle 3 Day 1; pre dose, 3 h post dose | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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MONARCH 3