Abstract
The objectives of this study were to characterize patterns of care and to identify predictors for adjuvant therapy in elderly patients with glioblastoma in the modern era. The National Cancer Data Base was queried for patients aged 70 years and older with glioblastoma diagnosed from January 1, 2004 through December 31, 2012. Multinomial logistic regression was used to identify predictors for receiving adjuvant therapy. Survival outcomes were estimated using the Kaplan-Meier method and were analyzed using Cox regression models and the log-rank test. In total, 14,886 patients were identified. Of these, 8214 patients (55.2%) received combined-modality therapy with chemotherapy and radiation (CRT), 3955 (26.6%) received no adjuvant therapy, 2065 (13.9%) received radiation therapy (RT) alone, and 652 (4.4%) received chemotherapy (CT) alone after undergoing resection. The receipt of CRT increased in frequency over the study interval, from 40.3% in 2004 to 59.8% in 2012. Younger patients (ages 70-75 years) were more likely to receive CRT than no adjuvant therapy (P < .0001 for all other age groups) or adjuvant RT alone (P < .0001 for all other age groups). Combined-modality therapy with adjuvant CRT produced improved survival outcomes, and the highest median overall survival was 9.2 months. In this analysis of elderly patients who had glioblastoma diagnosed from 2004 through 2012, a significant increase in the receipt of combined-modality therapy was observed. Combined-modality treatment produces improved survival outcomes and should be considered as adjuvant treatment for carefully selected elderly patients. Cancer 2017;123:3277-84. © 2017 American Cancer Society.
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