Impact of chemotherapy relative dose intensity on cause-specific and overall survival for stage I–III breast cancer: ER+/PR+, HER2- vs. triple-negative
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Abstract
Purpose
To investigate the impact of chemotherapy relative dose intensity (RDI) on cause-specific and overall survival for stage I–III breast cancer: estrogen receptor or progesterone receptor positive, human epidermal-growth factor receptor negative (ER+/PR+ and HER2-) vs. triple-negative (TNBC) and to identify the optimal RDI cut-off points in these two patient populations.
Methods
Data were collected by the Louisiana Tumor Registry for two CDC-funded projects. Women diagnosed with stage I–III ER+/PR+, HER2- breast cancer, or TNBC in 2011 with complete information on RDI were included. Five RDI cut-off points (95, 90, 85, 80, and 75%) were evaluated on cause-specific and overall survival, adjusting for multiple demographic variables, tumor characteristics, comorbidity, use of granulocyte-growth factor/cytokines, chemotherapy delay, chemotherapy regimens, and use of hormone therapy. Cox proportional hazards models and Kaplan–Meier survival curves were estimated and adjusted by stabilized inverse probability treatment weighting (IPTW) of propensity score.
Results
Of 494 ER+/PR+, HER2- patients and 180 TNBC patients, RDI < 85% accounted for 30.4 and 27.8%, respectively. Among ER+/PR+, HER2- patients, 85% was the only cut-off point at which the low RDI was significantly associated with worse overall survival (HR = 1.93; 95% CI 1.09–3.40). Among TNBC patients, 75% was the cut-off point at which the high RDI was associated with better cause-specific (HR = 2.64; 95% CI 1.09, 6.38) and overall survival (HR = 2.39; 95% CI 1.04–5.51).
Conclusions
Higher RDI of chemotherapy is associated with better survival for ER+/PR+, HER2- patients and TNBC patients. To optimize survival benefits, RDI should be maintained ≥ 85% in ER+/PR+, HER2- patients, and ≥ 75% in TNBC patients.
Keywords
Breast cancer Hormone receptor positive, Triple-negative Chemotherapy Relative dose intensityAbbreviations
- RDI
Relative dose intensity
- RCT
Randomized controlled trial
- ESBC
Early stage breast cancer
- CMF
Cyclophosphamide, methotrexate, and fluorouracil
- ER
Estrogen receptor
- PR
Progesterone receptor
- HER2
Human epidermal-growth factor receptor 2
- TNBC
Triple-negative breast cancer
- pCR
Pathologic complete response
- LTR
Louisiana Tumor Registry
- CER
Enhancing Cancer Registry Data for Comparative Effectiveness Research
- PCOR
Patient Centered Outcomes Research
- CDC
Centers for Disease Control and Prevention
- AJCC
American Joint Committee on Cancer
- BSA
body surface area
- NCCN
National Comprehensive Cancer Network
- AC-T
Doxorubicin/cyclophosphamide followed by paclitaxel or docetaxel
- TC
Docetaxel/cyclophosphamide
- TAC
Docetaxel/doxorubicin/cyclophosphamide
- AC
Doxorubicin/cyclophosphamide
- SEER
Surveillance, Epidemiology, and End Results program
- CCI
Charlson comorbidity index
- G-CSF
Granulocyte-growth factors/cytokines
- IPTW
Inverse probability of treatment weighting
- HR
Hazard ratio
- CI
Confidence interval
Notes
Acknowledgements
We acknowledge the Centers for Disease Control and Prevention (CDC) for funding Enhancing Cancer Registry Data for Comparative Effectiveness Research (CER) Project (Grant Number: 1eEDSK0106) and Patient Centered Outcomes Research (PCOR) project (Grant Number: 5NU58DP003915), and the Louisiana Tumor Registry for data and administrative support. We acknowledge Dr. Gary H. Lyman and Dr. Marek S. Poniewierski for clarifying variables used in the calculation of chemotherapy relative dose intensity.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
Ethical approval
For this type of study, formal consent is not required.
Supplementary material
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