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Off-study utilization of experimental therapies: Analysis of GOG249-eligible cohorts using real world data. | LitMetric
Objective : Adjuvant management of women with high-intermediate- and high-risk early-stage endometrial cancer remains controversial. Recently published results of GOG 249 revealed that vaginal brachytherapy plus chemotherapy (VBT + CT) was not superior to whole pelvic radiation therapy (WPRT) and was associated with more toxicities and higher nodal recurrences. This study examined off-study utilization of VBT + CT among women who met criteria for GOG 249 in the period prior to study publication.Methods : Women diagnosed with FIGO IA-IIB endometrioid, serous, or clear cell uterine cancer between 2004-2015 and treated with hysterectomy and radiotherapy (RT) were identified in the National Cancer Database. Cochrane-Armitrage trend test was used to assess trends over time. Univariate and multivariate Cox analyses were performed to calculate odds ratio (OR) of VBT + CT receipt and hazard ratio (HR) of OS. Propensity-score matched analysis was conducted to account for baseline differences.Results : 9956 women met inclusion criteria. 7548 women (75.8%) received WPRT while 2408 (24.2%) received VBT + CT in the study period. From 2004-2015, there was a significant increase in VBT + CT use (p < 0.001) with the largest overall increase occurring in 2009 to 22%. Factors significantly associated with VBT + CT receipt included higher socioeconomic status (p < 0.001), higher grade endometrioid cancer (p < 0.001), and aggressive histology (p < 0.001). After propensity-score matching, VBT + CT was associated with improved OS (HR 0.74, 95% CI 0.58-0.93); however, when stratified by FIGO stage, VBT + CT was only associated with improved OS for FIGO stage 1B (HR 0.62, 95% CI 0.44-0.87).Conclusions : There was significant use of experimental arm off-study treatment in the United States prior to report of GOG 249 results. Providers should be cautious when offering off-study treatment utilizing an experimental regimen given uncertainty about efficacy and toxicity.
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