http://pubs.jamanetwork.com/ en-us Wed, 25 Jan 2006 00:00:00 GMT Tue, 01 Jan 2013 00:46:30 GMT Silverchair editor@pubs.jamanetwork.com webmaster@pubs.jamanetwork.com http://pubs.jamanetwork.com/article.aspx?articleID=202254 Wed, 25 Jan 2006 00:00:00 GMT Lee CM, Szabo A, Shrieve DC, et al. <span class="paragraphSection">ContextThe benefit of adjuvant radiation therapy (RT) in stage I endometrial adenocarcinoma remains controversial despite several phase 3 trials.ObjectiveTo evaluate the frequency and effect of adjuvant RT on overall and relative survival within a large US population database.Design, Setting, and PopulationA retrospective analysis that used data from the Surveillance, Epidemiology, and End Results program of the US National Cancer Institute from January 1, 1988, to December 31, 2001. A total of 21 249 patients with American Joint Committee on Cancer stage IA-C node-negative endometrial adenocarcinoma comprised the study population.Main Outcome MeasuresOverall survival curves were constructed using Kaplan-Meier method and compared via stratified log-rank test within T stage/grade combinations, adjusted for age. Relative survival was performed to assess the effects of age, race, stage, grade, whether nodes were examined, and whether adjuvant RT was administered.ResultsOf 21 249 women, 4080 received adjuvant RT (19.2%) and 17 169 did not receive adjuvant RT (80.8%). The mean age at diagnosis was 63.2 years (range, 14-99 years). Adjuvant RT significantly improved overall survival for patients with stage IC/grade 1 (P<.001) and stage IC/grades 3 and 4 (P<.001). Cox proportional hazards regression analysis revealed a statistically detectable association of adjuvant RT with improved relative survival in patients with stage IC/grade 1 and stage IC/grades 3 and 4 (hazard ratio [HR], 0.44; 95% confidence interval [CI], 0.31-0.63; P<.001; and HR, 0.72; 95% CI, 0.57-0.92; P = .009; respectively). A separate analysis of those patients with a surgical lymph node examination at the time of total abdominal hysterectomy and bilateral salpingo-oophorectomy revealed similar estimates (HR, 0.59; 95% CI, 0.39-0.90; P = .01; and HR, 0.73; 95% CI, 0.55-0.96; P = .02; respectively).ConclusionsAs the largest reported population analysis to date of adjuvant RT in early stage endometrial adenocarcinoma, our study reveals a statistically significant association between improved overall and relative survival and adjuvant RT in stage IC disease (grades 1 and 3-4). Future work is needed to continue to delineate clinical and biological factors, which can guide treatment decisions and account for disparities in outcome between varied subsets of patients.</span> 295 4 389 397 10.1001/jama.295.4.389 http://pubs.jamanetwork.com/article.aspx?articleID=202254