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• W753296469 abstract "Background: Large randomized controlled trials have shown that hypofractionated whole breast irradiation (HF-WBI) is not inferior to or more toxic than conventionally fractionated whole breast irradiation (CF-WBI) for the treatment of early-stage breast cancer. Royal Marsden data were published in 2006 (10-yr), the Ontario trial was reported in 2002 (5-yr) and 2010 (10-yr), and the UK START trials were published in 2006 (5-yr) and 2013 (10-yr). We utilized the National Cancer Data Base (NCDB) to evaluate patterns of radiotherapy fractionation for early-stage, node-negative breast cancer in the U.S. We hypothesized that HF-WBI use would increase over time in response to emerging data supporting its use in this population. Methods: We conducted a retrospective, population-based cohort study of women >18 years diagnosed with T1-2N0 invasive breast carcinoma and treated with breast-conserving surgery between 2004 and 2011. Radiotherapy was categorized as accelerated partial breast irradiation (APBI; 38-40 Gy/1-10 fractions), HF-WBI (40-56 Gy/15-24 fractions) or CF-WBI (50-66 Gy/25-40 fractions). Patients treated with alternate fractionation were excluded. Patterns of breast radiotherapy fractionation were compared using the chi-square test. Multivariable logistic regression was performed for patients diagnosed in 2011, the year with the highest levels of HF-WBI utilization. Results: 217,789 patients in the NCDB met inclusion criteria. HF-WBI use increased over time, rising from 2.1% among eligible patients in 2004 to 15.1% in 2011, while APBI use remained low at 30 years. Table 1 shows frequency of HF-WBI use over time by center type. On multivariate analysis of patients diagnosed in 2011, the following factors were associated with higher use of HF-WBI: treatment at an academic center, older patient age, hormone receptor positivity, pT1 tumor size, and rural residence (Table 2). Conclusions: Utilization of HF-WBI in the US is rising, but remains low overall despite level I evidence showing its non-inferiority to CF-WBI. Given the advantages of HF-WBI in terms of patient convenience and potential healthcare system costs, further research is indicated to explore disparities in HF-WBI utilization in the US and to guide education of breast cancer providers. Citation Format: Yvonne M Mowery, Rachel A Greenup, Kevin Houck, Manisha Palta, Janet K Horton, Eun-Sil S Hwang, Julie A Sosa, Rachel C Blitzblau. Low utilization of hypofractionated radiotherapy for the treatment of early-stage breast cancer in the US [abstract]. In: Proceedings of the Thirty-Seventh Annual CTRC-AACR San Antonio Breast Cancer Symposium: 2014 Dec 9-13; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2015;75(9 Suppl):Abstract nr P1-15-10." @default.
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• W753296469 date "2015-04-30" @default.
• W753296469 modified "2023-09-27" @default.
• W753296469 title "Abstract P1-15-10: Low utilization of hypofractionated radiotherapy for the treatment of early-stage breast cancer in the US" @default.
• W753296469 doi "https://doi.org/10.1158/1538-7445.sabcs14-p1-15-10" @default.
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