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The Impact of Radiation Oncologists on the Early Adoption of Hypofractionated Radiation Therapy for Early-Stage Breast Cancer. 2017

Isabel J Boero, and Erin F Gillespie, and Jiayi Hou, and Anthony J Paravati, and Ellen Kim, and John P Einck, and Catheryn Yashar, and Loren K Mell, and James D Murphy
Department of Radiation Medicine and Applied Sciences, University of California, San Diego, La Jolla, California.

Despite multiple randomized trials showing the efficacy of hypofractionated radiation therapy in early-stage breast cancer, the United States has been slow to adopt this treatment. The goal of this study was to evaluate the impact of individual radiation oncologists on the early adoption of hypofractionated radiation therapy for early-stage breast cancer. We identified 22,233 Medicare beneficiaries with localized breast cancer that was diagnosed from 2004 to 2011 who underwent breast-conserving surgery with adjuvant radiation. Multilevel, multivariable logistic models clustered by radiation oncologist and geographic practice area were used to determine the impact of the provider and geographic region on the likelihood of receiving hypofractionated compared with standard fractionated radiation therapy while controlling for a patient's clinical and demographic covariates. Odds ratios (OR) describe the impact of demographic or clinical covariates, and the median OR (MOR) describes the relative impact of the individual radiation oncologist and geographic region on the likelihood of undergoing hypofractionated radiation therapy. Among the entire cohort, 2333 women (10.4%) were treated with hypofractionated radiation therapy, with unadjusted rates ranging from 0.0% in the bottom quintile of radiation oncologists to 30.4% in the top quintile. Multivariable analysis found that the individual radiation oncologist (MOR 3.08) had a greater impact on the use of hypofractionation than did geographic region (MOR 2.10) or clinical and demographic variables. The impact of the provider increased from the year 2004 to 2005 (MOR 2.82) to the year 2010 to 2011 (MOR 3.16) despite the publication of long-term randomized trial results in early 2010. Male physician and radiation oncologists treating the highest volume of breast cancer patients were less likely to perform hypofractionation (P<.05). The individual radiation oncologist strongly influenced the likelihood of a patient's receiving hypofractionated radiation therapy, and this trend increased despite the publication of long-term data showing equivalence to standard fractionation. Future research should focus on physician-related factors that influence this decision.

UI MeSH Term Description Entries
D008297 Male Males
D009367 Neoplasm Staging Methods which attempt to express in replicable terms the extent of the neoplasm in the patient. Cancer Staging,Staging, Neoplasm,Tumor Staging,TNM Classification,TNM Staging,TNM Staging System,Classification, TNM,Classifications, TNM,Staging System, TNM,Staging Systems, TNM,Staging, Cancer,Staging, TNM,Staging, Tumor,System, TNM Staging,Systems, TNM Staging,TNM Classifications,TNM Staging Systems
D010818 Practice Patterns, Physicians' Patterns of practice related to diagnosis and treatment as especially influenced by cost of the service requested and provided. Clinical Practice Patterns,Physician's Practice Patterns,Clinical Practice Pattern,Pattern, Clinical Practice,Patterns, Clinical Practice,Practice Pattern, Clinical,Practice Patterns, Clinical,Practice Patterns, Physician's,Prescribing Patterns, Physician,Physician Practice Patterns,Physician Prescribing Pattern,Physician Prescribing Patterns,Physician's Practice Pattern,Physicians' Practice Pattern,Physicians' Practice Patterns,Practice Pattern, Physician's,Practice Pattern, Physicians',Practice Patterns, Physician,Prescribing Pattern, Physician
D011365 Professional Practice Location Geographic area in which a professional person practices; includes primarily physicians and dentists. Location, Professional Practice,Locations, Professional Practice,Practice Location, Professional,Practice Locations, Professional,Professional Practice Locations
D001943 Breast Neoplasms Tumors or cancer of the human BREAST. Breast Cancer,Breast Tumors,Cancer of Breast,Breast Carcinoma,Cancer of the Breast,Human Mammary Carcinoma,Malignant Neoplasm of Breast,Malignant Tumor of Breast,Mammary Cancer,Mammary Carcinoma, Human,Mammary Neoplasm, Human,Mammary Neoplasms, Human,Neoplasms, Breast,Tumors, Breast,Breast Carcinomas,Breast Malignant Neoplasm,Breast Malignant Neoplasms,Breast Malignant Tumor,Breast Malignant Tumors,Breast Neoplasm,Breast Tumor,Cancer, Breast,Cancer, Mammary,Cancers, Mammary,Carcinoma, Breast,Carcinoma, Human Mammary,Carcinomas, Breast,Carcinomas, Human Mammary,Human Mammary Carcinomas,Human Mammary Neoplasm,Human Mammary Neoplasms,Mammary Cancers,Mammary Carcinomas, Human,Neoplasm, Breast,Neoplasm, Human Mammary,Neoplasms, Human Mammary,Tumor, Breast
D003657 Decision Making The process of making a selective intellectual judgment when presented with several complex alternatives consisting of several variables, and usually defining a course of action or an idea. Credit Assignment,Assignment, Credit,Assignments, Credit,Credit Assignments
D005260 Female Females
D006278 Medicare Federal program, created by Public Law 89-97, Title XVIII-Health Insurance for the Aged, a 1965 amendment to the Social Security Act, that provides health insurance benefits to persons over the age of 65 and others eligible for Social Security benefits. It consists of two separate but coordinated programs: hospital insurance (MEDICARE PART A) and supplementary medical insurance (MEDICARE PART B). (Hospital Administration Terminology, AHA, 2d ed and A Discursive Dictionary of Health Care, US House of Representatives, 1976) Health Insurance for Aged and Disabled, Title 18,Insurance, Health, for Aged and Disabled,Health Insurance for Aged, Disabled, Title 18,Health Insurance for Aged, Title 18
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000069473 Radiation Dose Hypofractionation A treatment schedule in which the total dose of radiation is divided into large doses but fewer exposure times. Hypofractionated Dose, Radiation,Radiotherapy Dose Hypofractionation,Radiotherapy Minibeams,Dose Hypofractionation, Radiation,Dose Hypofractionation, Radiotherapy,Hypofractionation, Radiation Dose,Hypofractionation, Radiotherapy Dose,Hypofractionations, Radiotherapy Dose,Minibeam, Radiotherapy,Radiation Hypofractionated Dose,Radiotherapy Minibeam

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