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Stage Presentation, Care Patterns, Treatment Outcomes, and Impact of Radiotherapy on Overall Survival for Adrenocortical Carcinoma.

INTRODUCTION: Adrenocortical carcinoma (ACC) is a rare cancer with few well-powered studies regarding epidemiology or outcomes and even fewer studies to guide an evidence-based management approach. The effect of radiation therapy (RT) is particularly understudied and remains unclear, outside of general oncologic principles. We sought to describe current care patterns in the management of ACC and how these practices affect survival outcomes using the Surveillance, Epidemiology, and End Results (SEER) database.

METHODS: Patients with ACC who could be staged by the American Joint Committee on Cancer (AJCC) system diagnosed between 1988 and 2015 were included. A classification and regression tree analysis identified subgroups of patients who may have benefitted from RT. Multivariable Cox regression analysis was used to compare overall survival (OS). Propensity score adjustment was used to compare OS for a subset of node-negative, nonmetastatic patients who received adjuvant RT following radical surgery.

RESULTS: Among 865 eligible patients included in the analysis, only 10.5% received RT. In stage III node-negative patients, adjuvant RT following radical surgery was associated with a significantly improved OS compared with surgery alone.

CONCLUSION: Medically fit persons with stage III, node-negative ACC should receive adjuvant RT after surgical resection.

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