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MINI 06 - Quality/Prognosis/Survival (ID 111)
- Event: WCLC 2015
- Type: Mini Oral
- Track: Treatment of Localized Disease - NSCLC
- Presentations: 1
MINI06.03 - Improved Survival in Patients with Stage I-II NSCLC Treated with Surgery or Radiotherapy in the Department of Veterans Affairs (ID 1276)
16:45 - 18:15 | Author(s): D. Moghanaki
Recent advancements in surgical and radiotherapy techniques for early stage NSCLC have demonstrated improved outcomes in clinical trials and case series. However, their impact on large populations remains poorly studied. We therefore analyzed Department of Veterans Affairs (VA) data to evaluate temporal trends in survival within a large integrated healthcare system during the decade these techniques were introduced.
Using VA Central Cancer Registry and vital status data, patients diagnosed with stage I-II NSCLC between 1/1/2001-12/31/2010 were identified. Patient characteristics assessed included age, race, stage, histology, Charlson comorbidity index, specific comorbid conditions, and smoking status. Descriptive and chi-square statistics were used to compare patient characteristics and outcomes.
18,442 patients were identified with stage I-II NSCLC. The primary modality of treatment was surgery in 10,754 (58%), radiotherapy in 3,708 (20%), and another or no therapy in 3,980 (22%). Patients treated with surgery were younger (median age 66 vs 72%, p<0.0001), were more likely to have a comorbidity index of 0 (28% vs 18%, p<0.0001), and were less likely to have COPD (41% vs 58%, p<0.0001), diabetes (22% vs 25%, p=0.0026), peripheral vascular disease (16% vs 20%,P<0.0001), and coronary vascular disease (9 vs 12%,p<0.0001). Surgery patients were more likely to be current (52% vs 45%, p<0.0001) and less likely to be former (39% vs 45%,p<0.0001) smokers. Equal percentages of surgery and radiation patients were black (14% vs 15%) and white (86% vs 85%). Compared to radiotherapy, surgery patients were more likely to have earlier stage disease (stage I: 79% vs 70%, p<0.0001), and adenocarcinoma (45% vs 22%, p<0.0001). The number of stage I-II NSCLC patients treated with radiotherapy or surgery increased by 50% (667 to 1,001) and 35% (1,845 to 2,496), respectively. The percentage treated each year with surgery increased from 56% in 2001 to a peak of 61% in 2004-2005, decreasing back to 56% in 2010. Inversely, the percentage treated each year with radiation decreased from 21% in 2001, to 17% in 2005 and increased to 24% in 2010. The use of other/no therapy remained unchanged. The Southern region comprised almost half of all treated lung cancer diagnoses (46%), followed by the Midwest (21%), the West (17%), and the Northeastern Region (14%). Between 2001-2010, the number of patients receiving therapy (radiation or surgery) increased each year (p=0.0017). The 4-year survival rate was 54% for surgery patients and 19% for radiotherapy patients (p<0.0001), which varied based on stage (stage I: 58% vs 22%; stage II: 41% vs 13%, respectively). Between 2001-2010, patients treated with either surgery or radiotherapy had a 12% absolute improvement in 4 year OS, representing a 100% survival improvement with radiotherapy (12% to 24%) and a 24% improvement with surgery (49% to 61%).
The Department of Veterans Affairs is treating increasing numbers of patients with stage I-II NSCLC. Following a decade when advanced technologies were introduced for surgery and radiotherapy, survival rates have improved significantly for both treatment modalities. The largest gains were observed among patients treated with radiotherapy with a doubling of 4-year survival.
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