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MINI 19 - Surgical Topics in Localized NSCLC (ID 138)
- Event: WCLC 2015
- Type: Mini Oral
- Track: Treatment of Localized Disease - NSCLC
- Presentations: 1
MINI19.01 - Benefits of Surgical Treatment and Complementary Utility of Metabolic Tumor Volume in Selecting Therapy for Stage III NSCLC (ID 3143)
16:45 - 18:15 | Author(s): H. Macmahon
Stage III NSCLC has large variations in primary and nodal metastatic tumor burden and its treatment is controversial.We determined the benefit to overall survival (OS) of these patients from surgery, and potentially complementary role of FDG-PET/CT-based metabolic tumor volume of primary tumor (MTV~T~), nodal metastasis (MTV~N~), and whole-body (MTV~WB~) in selecting patients for surgery.
With IRB approval, we retrospectively reviewed 239 stage III NSCLC cases with pre-therapy FDG-PET/CT scans treated 2004 – 2013 (141 IIIA and 98 IIIB, 115 men and 124 women, median age 67.2 years), and measured MTV~T~,MTV~N~, and MTV~WB~. Kaplan-Meier curves and log-rank test were used for determining survival differences between surgically and non-surgically treated patients. Multivariate Cox regression analyses were conducted. Logistic regression analysis was used to evaluate whether each covariate was associated with receiving surgery(including surgery alone and surgery in combination with chemo or radiation). Wilcoxon rank-sum tests were performed for determining differences of primary, nodal, and whole-body MTV between the groups.
30% (42/141) of IIIA patients and 10% (10/98) of IIIB patients had surgical treatment (p<0.001, Chi-square test). OS was different between surgically and non-surgically treated patients (p<0.001) at 1 year(86% vs. 54%), 2 years(64% vs. 32%), 3 years(52% vs. 21%), and 5 years(39% vs. 14%), with median survival of 37.3 months vs.13.6 months, respectively. Covariates associated with OS were: surgery (0.43 ≤ HR ≤ 0.46, p≤0.001), log~10~MTV~T~ (HR=1.54, p<0.001), log~10~MTV~N~ (HR=1.63, p<0.001), and log~10~MTV~WB~ (HR=2.06, p<0.001) (Figure 1). Log~10~MTV~T~, Log~10~MTV~N~, and Log~10~MTV~WB ~were inversely associated with receiving surgery, with odds ratio of 0.53(p=0.01), 0.55(p=0.036), and 0.38 (p=0.002), respectively. MTV~T~, MTV~N~, and MTV~WB~ were smaller in surgically treated patients, with median of surgically vs. non-surgically treated patients of 17.8 vs. 55.0, 5.3 vs. 15.1, and 27.8 vs. 92.0 cc, respectively (p≤0.004). Additionally, those with stage IIIB disease were significantly less likely to receive surgery after controlling for age, gender, and MTV. No statistically significant interactions were found between surgery and stage or between surgery and log~10~MTV~T~, log~10~ MTV~N~, or log~10~MTV~WB~.Figure 1
Surgery and smaller MTV are associated with better OS of stage-III NSCLC patients. Smaller MTV and stage IIIA (vs. IIIB) are associated with receiving surgery. FDG PET/CT-based metabolic tumor volume can potentially inform surgical treatment decisions to further improve survival outcome.
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