Prevalence and risk of skeletal complications and use of radiation therapy in elderly women diagnosed with metastatic breast cancer
Real-world data regarding patient factors associated with the occurrence of spinal cord compression (SCC) or pathological fracture (PF), or need for bone surgery (BS), or use of radiation therapy (RAD) (i.e. skeletal complications and radiation therapy; SCRT) are limited for women with metastatic br...
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| Vydáno v: | PloS one Ročník 13; číslo 3; s. e0193661 |
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01.03.2018
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| Abstract | Real-world data regarding patient factors associated with the occurrence of spinal cord compression (SCC) or pathological fracture (PF), or need for bone surgery (BS), or use of radiation therapy (RAD) (i.e. skeletal complications and radiation therapy; SCRT) are limited for women with metastatic breast cancer (BCa). Given the substantial clinical and economic burden of these events in advanced BCa, we conducted the present study to understand the prevalence and identify the risk factors associated with these events among elderly women presenting with de novo metastatic BCa.
Using linked Surveillance, Epidemiology, and End Results and Medicare data, we identified women with incident metastatic BCa diagnosed during 2005-2009. Associations between patient demographics and select clinically relevant factors, and SCRT were examined using the Cox proportional hazards model, accounting for death as a competing risk.
Of 3,731 Medicare beneficiaries with incident metastatic BCa, 1,808 (48.5%) experienced at least one SCRT event during a median follow-up of 13.2 months; a majority (69%) experienced a subsequent SCRT event. The proportions of women who had RAD, PF, BS, and SCC were: 32%, 28%, 8%, and 4%. Older women (80+ years), or those with more comorbid conditions (CCI≥2) had a statistically significant lower risk of SCRT (HR 0.78 [CI: 0.67-0.92, p<0.01]; HR 0.77 [CI: 0.67-0.89, p<0.01], respectively), primarily due to lower frequency of radiotherapy (p<0.01). Compared to Caucasians, African Americans had lower risk of SCRT (HR 0.70 [CI: 0.60-0.82, p<0.01]), as well as all SCRT subtypes defining this group except for SCC, which was the same for both race groups.
This study highlights that certain patient characteristics and clinical factors are associated with the risk of spinal cord compression or pathologic fractures, or need for bone surgery or radiation among women with metastatic BCa. In future studies, it will also be important to consider the clinical and economic burden based on these components of skeletal complications and radiation therapy use in order to guide and improve the management of women with advanced BCa. |
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| AbstractList | Real-world data regarding patient factors associated with the occurrence of spinal cord compression (SCC) or pathological fracture (PF), or need for bone surgery (BS), or use of radiation therapy (RAD) (i.e. skeletal complications and radiation therapy; SCRT) are limited for women with metastatic breast cancer (BCa). Given the substantial clinical and economic burden of these events in advanced BCa, we conducted the present study to understand the prevalence and identify the risk factors associated with these events among elderly women presenting with de novo metastatic BCa. Using linked Surveillance, Epidemiology, and End Results and Medicare data, we identified women with incident metastatic BCa diagnosed during 2005-2009. Associations between patient demographics and select clinically relevant factors, and SCRT were examined using the Cox proportional hazards model, accounting for death as a competing risk. Of 3,731 Medicare beneficiaries with incident metastatic BCa, 1,808 (48.5%) experienced at least one SCRT event during a median follow-up of 13.2 months; a majority (69%) experienced a subsequent SCRT event. The proportions of women who had RAD, PF, BS, and SCC were: 32%, 28%, 8%, and 4%. Older women (80+ years), or those with more comorbid conditions (CCI[greater than or equal to]2) had a statistically significant lower risk of SCRT (HR 0.78 [CI: 0.67-0.92, p<0.01]; HR 0.77 [CI: 0.67-0.89, p<0.01], respectively), primarily due to lower frequency of radiotherapy (p<0.01). Compared to Caucasians, African Americans had lower risk of SCRT (HR 0.70 [CI: 0.60-0.82, p<0.01]), as well as all SCRT subtypes defining this group except for SCC, which was the same for both race groups. This study highlights that certain patient characteristics and clinical factors are associated with the risk of spinal cord compression or pathologic fractures, or need for bone surgery or radiation among women with metastatic BCa. In future studies, it will also be important to consider the clinical and economic burden based on these components of skeletal complications and radiation therapy use in order to guide and improve the management of women with advanced BCa. Real-world data regarding patient factors associated with the occurrence of spinal cord compression (SCC) or pathological fracture (PF), or need for bone surgery (BS), or use of radiation therapy (RAD) (i.e. skeletal complications and radiation therapy; SCRT) are limited for women with metastatic breast cancer (BCa). Given the substantial clinical and economic burden of these events in advanced BCa, we conducted the present study to understand the prevalence and identify the risk factors associated with these events among elderly women presenting with de novo metastatic BCa.OBJECTIVEReal-world data regarding patient factors associated with the occurrence of spinal cord compression (SCC) or pathological fracture (PF), or need for bone surgery (BS), or use of radiation therapy (RAD) (i.e. skeletal complications and radiation therapy; SCRT) are limited for women with metastatic breast cancer (BCa). Given the substantial clinical and economic burden of these events in advanced BCa, we conducted the present study to understand the prevalence and identify the risk factors associated with these events among elderly women presenting with de novo metastatic BCa.Using linked Surveillance, Epidemiology, and End Results and Medicare data, we identified women with incident metastatic BCa diagnosed during 2005-2009. Associations between patient demographics and select clinically relevant factors, and SCRT were examined using the Cox proportional hazards model, accounting for death as a competing risk.METHODSUsing linked Surveillance, Epidemiology, and End Results and Medicare data, we identified women with incident metastatic BCa diagnosed during 2005-2009. Associations between patient demographics and select clinically relevant factors, and SCRT were examined using the Cox proportional hazards model, accounting for death as a competing risk.Of 3,731 Medicare beneficiaries with incident metastatic BCa, 1,808 (48.5%) experienced at least one SCRT event during a median follow-up of 13.2 months; a majority (69%) experienced a subsequent SCRT event. The proportions of women who had RAD, PF, BS, and SCC were: 32%, 28%, 8%, and 4%. Older women (80+ years), or those with more comorbid conditions (CCI≥2) had a statistically significant lower risk of SCRT (HR 0.78 [CI: 0.67-0.92, p<0.01]; HR 0.77 [CI: 0.67-0.89, p<0.01], respectively), primarily due to lower frequency of radiotherapy (p<0.01). Compared to Caucasians, African Americans had lower risk of SCRT (HR 0.70 [CI: 0.60-0.82, p<0.01]), as well as all SCRT subtypes defining this group except for SCC, which was the same for both race groups.RESULTSOf 3,731 Medicare beneficiaries with incident metastatic BCa, 1,808 (48.5%) experienced at least one SCRT event during a median follow-up of 13.2 months; a majority (69%) experienced a subsequent SCRT event. The proportions of women who had RAD, PF, BS, and SCC were: 32%, 28%, 8%, and 4%. Older women (80+ years), or those with more comorbid conditions (CCI≥2) had a statistically significant lower risk of SCRT (HR 0.78 [CI: 0.67-0.92, p<0.01]; HR 0.77 [CI: 0.67-0.89, p<0.01], respectively), primarily due to lower frequency of radiotherapy (p<0.01). Compared to Caucasians, African Americans had lower risk of SCRT (HR 0.70 [CI: 0.60-0.82, p<0.01]), as well as all SCRT subtypes defining this group except for SCC, which was the same for both race groups.This study highlights that certain patient characteristics and clinical factors are associated with the risk of spinal cord compression or pathologic fractures, or need for bone surgery or radiation among women with metastatic BCa. In future studies, it will also be important to consider the clinical and economic burden based on these components of skeletal complications and radiation therapy use in order to guide and improve the management of women with advanced BCa.CONCLUSIONThis study highlights that certain patient characteristics and clinical factors are associated with the risk of spinal cord compression or pathologic fractures, or need for bone surgery or radiation among women with metastatic BCa. In future studies, it will also be important to consider the clinical and economic burden based on these components of skeletal complications and radiation therapy use in order to guide and improve the management of women with advanced BCa. Real-world data regarding patient factors associated with the occurrence of spinal cord compression (SCC) or pathological fracture (PF), or need for bone surgery (BS), or use of radiation therapy (RAD) (i.e. skeletal complications and radiation therapy; SCRT) are limited for women with metastatic breast cancer (BCa). Given the substantial clinical and economic burden of these events in advanced BCa, we conducted the present study to understand the prevalence and identify the risk factors associated with these events among elderly women presenting with de novo metastatic BCa.Using linked Surveillance, Epidemiology, and End Results and Medicare data, we identified women with incident metastatic BCa diagnosed during 2005-2009. Associations between patient demographics and select clinically relevant factors, and SCRT were examined using the Cox proportional hazards model, accounting for death as a competing risk.Of 3,731 Medicare beneficiaries with incident metastatic BCa, 1,808 (48.5%) experienced at least one SCRT event during a median follow-up of 13.2 months; a majority (69%) experienced a subsequent SCRT event. The proportions of women who had RAD, PF, BS, and SCC were: 32%, 28%, 8%, and 4%. Older women (80+ years), or those with more comorbid conditions (CCI≥2) had a statistically significant lower risk of SCRT (HR 0.78 [CI: 0.67-0.92, p<0.01]; HR 0.77 [CI: 0.67-0.89, p<0.01], respectively), primarily due to lower frequency of radiotherapy (p<0.01). Compared to Caucasians, African Americans had lower risk of SCRT (HR 0.70 [CI: 0.60-0.82, p<0.01]), as well as all SCRT subtypes defining this group except for SCC, which was the same for both race groups.This study highlights that certain patient characteristics and clinical factors are associated with the risk of spinal cord compression or pathologic fractures, or need for bone surgery or radiation among women with metastatic BCa. In future studies, it will also be important to consider the clinical and economic burden based on these components of skeletal complications and radiation therapy use in order to guide and improve the management of women with advanced BCa. Real-world data regarding patient factors associated with the occurrence of spinal cord compression (SCC) or pathological fracture (PF), or need for bone surgery (BS), or use of radiation therapy (RAD) (i.e. skeletal complications and radiation therapy; SCRT) are limited for women with metastatic breast cancer (BCa). Given the substantial clinical and economic burden of these events in advanced BCa, we conducted the present study to understand the prevalence and identify the risk factors associated with these events among elderly women presenting with de novo metastatic BCa. Using linked Surveillance, Epidemiology, and End Results and Medicare data, we identified women with incident metastatic BCa diagnosed during 2005-2009. Associations between patient demographics and select clinically relevant factors, and SCRT were examined using the Cox proportional hazards model, accounting for death as a competing risk. Of 3,731 Medicare beneficiaries with incident metastatic BCa, 1,808 (48.5%) experienced at least one SCRT event during a median follow-up of 13.2 months; a majority (69%) experienced a subsequent SCRT event. The proportions of women who had RAD, PF, BS, and SCC were: 32%, 28%, 8%, and 4%. Older women (80+ years), or those with more comorbid conditions (CCI≥2) had a statistically significant lower risk of SCRT (HR 0.78 [CI: 0.67-0.92, p<0.01]; HR 0.77 [CI: 0.67-0.89, p<0.01], respectively), primarily due to lower frequency of radiotherapy (p<0.01). Compared to Caucasians, African Americans had lower risk of SCRT (HR 0.70 [CI: 0.60-0.82, p<0.01]), as well as all SCRT subtypes defining this group except for SCC, which was the same for both race groups. This study highlights that certain patient characteristics and clinical factors are associated with the risk of spinal cord compression or pathologic fractures, or need for bone surgery or radiation among women with metastatic BCa. In future studies, it will also be important to consider the clinical and economic burden based on these components of skeletal complications and radiation therapy use in order to guide and improve the management of women with advanced BCa. Objective Real-world data regarding patient factors associated with the occurrence of spinal cord compression (SCC) or pathological fracture (PF), or need for bone surgery (BS), or use of radiation therapy (RAD) (i.e. skeletal complications and radiation therapy; SCRT) are limited for women with metastatic breast cancer (BCa). Given the substantial clinical and economic burden of these events in advanced BCa, we conducted the present study to understand the prevalence and identify the risk factors associated with these events among elderly women presenting with de novo metastatic BCa. Methods Using linked Surveillance, Epidemiology, and End Results and Medicare data, we identified women with incident metastatic BCa diagnosed during 2005-2009. Associations between patient demographics and select clinically relevant factors, and SCRT were examined using the Cox proportional hazards model, accounting for death as a competing risk. Results Of 3,731 Medicare beneficiaries with incident metastatic BCa, 1,808 (48.5%) experienced at least one SCRT event during a median follow-up of 13.2 months; a majority (69%) experienced a subsequent SCRT event. The proportions of women who had RAD, PF, BS, and SCC were: 32%, 28%, 8%, and 4%. Older women (80+ years), or those with more comorbid conditions (CCI[greater than or equal to]2) had a statistically significant lower risk of SCRT (HR 0.78 [CI: 0.67-0.92, p<0.01]; HR 0.77 [CI: 0.67-0.89, p<0.01], respectively), primarily due to lower frequency of radiotherapy (p<0.01). Compared to Caucasians, African Americans had lower risk of SCRT (HR 0.70 [CI: 0.60-0.82, p<0.01]), as well as all SCRT subtypes defining this group except for SCC, which was the same for both race groups. Conclusion This study highlights that certain patient characteristics and clinical factors are associated with the risk of spinal cord compression or pathologic fractures, or need for bone surgery or radiation among women with metastatic BCa. In future studies, it will also be important to consider the clinical and economic burden based on these components of skeletal complications and radiation therapy use in order to guide and improve the management of women with advanced BCa. |
| Audience | Academic |
| Author | Onukwugha, Eberechukwu Arellano, Jorge Tkaczuk, Katherine H. R. Yong, Candice Hussain, Arif Mullins, C. Daniel Qian, Yi |
| AuthorAffiliation | University of South Alabama Mitchell Cancer Institute, UNITED STATES 3 University of Maryland School of Pharmacy, Baltimore, MD, United States of America 1 Department of Medicine, University of Maryland Medical Center, Baltimore, MD, United States of America 4 Amgen Inc., Thousand Oaks, CA, United States of America 2 Veterans Affairs Medical Center, Baltimore, MD, United States of America |
| AuthorAffiliation_xml | – name: 2 Veterans Affairs Medical Center, Baltimore, MD, United States of America – name: University of South Alabama Mitchell Cancer Institute, UNITED STATES – name: 1 Department of Medicine, University of Maryland Medical Center, Baltimore, MD, United States of America – name: 3 University of Maryland School of Pharmacy, Baltimore, MD, United States of America – name: 4 Amgen Inc., Thousand Oaks, CA, United States of America |
| Author_xml | – sequence: 1 givenname: Arif surname: Hussain fullname: Hussain, Arif – sequence: 2 givenname: Candice surname: Yong fullname: Yong, Candice – sequence: 3 givenname: Katherine H. R. surname: Tkaczuk fullname: Tkaczuk, Katherine H. R. – sequence: 4 givenname: Yi surname: Qian fullname: Qian, Yi – sequence: 5 givenname: Jorge surname: Arellano fullname: Arellano, Jorge – sequence: 6 givenname: C. Daniel surname: Mullins fullname: Mullins, C. Daniel – sequence: 7 givenname: Eberechukwu surname: Onukwugha fullname: Onukwugha, Eberechukwu |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/29494653$$D View this record in MEDLINE/PubMed |
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| Notes | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Current address: AstraZeneca, Gaithersburg, MD, United States of America Competing Interests: AH: Research funding – Amgen; Department of Veterans Affairs Merit Review Award. CY: Employment - AstraZeneca. KHRT: None. YQ: Employment – Amgen. Stock – Amgen. JA: Employment – Amgen. Stock – Amgen. CDM: Consulting/Advisory Role - Amgen; Bayer; Lexicon; Mundipharma; Novartis; Regeneron/Sanofi; Pfizer. Research funding – Amgen; Bayer; Pfizer. EO: Consultant/Advisory Role – AstraZeneca. Research Funding - Amgen; Bayer; Takeda. This does not alter our adherence to PLOS ONE policies on sharing data and materials. |
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| SubjectTerms | Aged Aged, 80 and over Biology and Life Sciences Bone transplantation Breast Neoplasms - epidemiology Breast Neoplasms - radiotherapy Care and treatment Female Fractures, Spontaneous - epidemiology Fractures, Spontaneous - etiology Fractures, Spontaneous - surgery Humans Medicare Medicine and Health Sciences Neoplasm Metastasis Prevalence Radiotherapy Risk Factors SEER Program Spinal cord compression Spinal Cord Compression - epidemiology Spinal Cord Compression - etiology Spinal Cord Compression - surgery United States - epidemiology |
| Title | Prevalence and risk of skeletal complications and use of radiation therapy in elderly women diagnosed with metastatic breast cancer |
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