Clinical Outcome and Toxicity Data in Patients With Advanced Breast Cancer Treated With CDK Inhibitors Combined With Endocrine Therapy

Study Overview
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Brief Summary
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The present study will assess real-world clinical outcomes and adverse events from treatment with endocrine therapy combined with CDKi in patients with HR-positive, HER2-negative advanced breast cancer.

Detailed Description
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Patients This will be a retrospective analysis of patients with histologically confirmed HR-positive, HER2-negative advanced (recurrent or metastatic) breast cancer. The investigators will use data from patients treated at Hellenic Cooperative Oncology Group (HeCOG)-affiliated departments of oncology. Eligible patients will be of 18 years or older, women of any menopausal status with HR-positive/HER2-negative advanced breast cancer who have received treatment with CDKi in combination with endocrine therapy for their advanced breast cancer. Treatment combinations of CDKi with any endocrine therapy will be accepted. Patients will be included in the analysis if they heve received at least two months of treatment with a CDKi. Patient clinical data will be obtained from their medical records. Toxicity data will be recorded from the clinicians' documentations during scheduled patient clinical visits. Statistical analysis The primary endpoint of the study will be progression-free survival (PFS), defined as the time from treatment initiation to either the first documented disease progression or death from any cause. Secondary endpoint will be overall survival (OS), defined as the time from treatment initiation to patient death or last contact. Patients alive will be censored at the date of last contact. Adverse events will be graded based on Common Terminology Criteria for Adverse Events (CTCAE, version 4.0). Survival curves will be estimated using the Kaplan-Meier method and compared across groups with the log-rank test. The associations between the clinicopathological factors to be examined and the mortality rate will be evaluated with hazard ratios estimated with Cox proportional hazards model. The statistical analyses will be completed using the SAS software (SAS for Windows, version 9.3, SAS Institute Inc., Cary, NC).

Official Title
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Registry Study of Patients With Advanced Breast Cancer Treated With Cyclin-dependent Kinase 4/6 (CDK4/6) Inhibitors Combined With Endocrine Therapy: the Experience of the Hellenic Cooperative Oncology Group

Conditions
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Breast Cancer Stage IV

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: 18 years or older Αny menopausal status is allowed HR-positive/HER2-negative advanced breast cancer Patients treated with CDKi in combination with endocrine therapy for their advanced breast cancer Combinations of CDKi with any endocrine therapy are allowed More than two months of treatment with a CDKi is mandatory Exclusion criteria: • Treatment with CDKi as (neo)adjuvant treatment

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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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Patients with advanced HR-positive breast cancer<br>patients with histologically confirmed HR-positive, HER2-negative advanced (recurrent or metastatic) breast cancer. Patients had been treated in Hellenic Cooperative Oncology Group (HeCOG)-affiliated departments of oncology | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Toxicity rates | Rates of adverse events from the combination of CDKi and endocrine therapy | Time Frame: through the completion of the study, up to 2 years | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Overall Survival | Overall survival was defined as the time from diagnosis until death from any cause or last follow-up | Time Frame: from the date of treatment start until death from any cause or date of last contact whichever occurred first, assessed up to 60 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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CDK, Breast cancer, toxicity, outcome