Abstract
Background
Skeletal-related events (SREs) are significant contributors to the morbidity and mortality in patients with bone metastasis from breast cancer. Thus, bone-modifying agents (BMAs) are recommended in this population. However, the baseline risk factors of SREs in patients with bone metastasis from breast cancer receiving BMAs are not well understood.
Methods
We analyzed the patient-level data from a controlled arm of a clinical trial comparing denosumab with zoledronate in patients with bone metastases from breast cancer (ClinicalTrial.gov ID: NCT00321464) available at Project Data Sphere, a broad-access research platform that collects and curates patient-level data from completed, phase III cancer trials. The primary endpoint was the first SRE after the inclusion to the trial. The time to the first on study SRE was analyzed using Cox proportional hazards model based on patients’ baseline characteristics including age, race, ECOG performance status (PS), histology and immunohistochemistry of breast cancer, and urine and serum laboratory data.
Results
Among 756 patients in the zoledronate arm of the trial, we excluded 64 patients with a documented history of osteopenia or osteoporosis. The median age of the patients was 56 years old, the median follow-up was 553 days, and 249 patients (36%) had SREs. The univariate analysis showed that black or African American heritage, ECOG PS > 0, human epidermal growth factor receptor 2 (HER2) positivity, high urine N-telopeptide cross-links / creatinine ratio (NTx/Cre), and elevated serum alkaline phosphatase (ALP) are significant baseline risk factors for SREs. Patients with the characteristics of ECOG PS > 0, HER2 positivity, and elevated ALP also showed a significantly higher hazard ratio of SREs in multivariate analysis.
Conclusions
We determined risk factors for SREs in patients with bone metastasis from breast cancer.
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Abbreviations
- ALP:
-
Alkaline phosphatase
- BALP:
-
Bone specific alkaline phosphatase
- BMA:
-
Bone-modifying agent
- BMD:
-
Bone mineral density
- CI:
-
Confidence interval
- HR:
-
Hazard ratio
- NTx/Cre:
-
N-telopeptide cross-links / creatinine ratio
- PF:
-
Pathologic fracture
- PS:
-
Performance status
- RTB:
-
Radiation therapy to bone
- SCC:
-
Spinal cord compression
- SRE:
-
Skeletal-related event
- STB:
-
Surgical therapy to bone
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This publication is based on research using information obtained from www.projectdatasphere.org, which is maintained by Project Data Sphere. Neither Project Data Sphere nor the owner(s) of any information from the web site has contributed to, approved or is in any way responsible for the contents of this publication.
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Hirotaka Miyashita declares that he has no conflict of interest. Christina Cruz declares that she has no conflict of interest. Stephen Malamud declares that he has no conflict of interest.
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Miyashita, H., Cruz, C. & Malamud, S. Risk factors for skeletal-related events in patients with bone metastasis from breast cancer undergoing treatment with zoledronate. Breast Cancer Res Treat 182, 381–388 (2020). https://doi.org/10.1007/s10549-020-05712-4
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DOI: https://doi.org/10.1007/s10549-020-05712-4