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O29 - Cancer Control & Epidemiology IV (ID 132)
- Event: WCLC 2013
- Type: Oral Abstract Session
- Track: Prevention & Epidemiology
- Presentations: 1
O29.06 - Prognostic Value of FDG-PET/CT Volumetric Prognostic Staging System in Non-small Cell Lung Caner (ID 2278)
10:30 - 12:00 | Author(s): C. Kao
Whole-body metabolic tumor volume (MTV~WB~) is a prognostic index independent of TNM staging, age, gender, performance status and treatment in non-small cell lung cancer (NSCLC). The current TNM staging system is also a prognostic index. However, it lacks advanced quantitative volumetric measurement in the 7[th] edition NSCLC TNM staging system. Integrating quantitative MTV~WB~ measurement into the current NSCLC staging system may make the staging system more quantitative and probably more prognostic. This study’s aim was to determine the utility of a FDG-PET volumetric prognostic (PVP) staging system based on univariate Cox regression models as a new prognostic index in NSCLC.
328 consecutive patients (156 males,172 females) with histologically proven NSCLC and median age of 68.3 years were identified for this retrospective analysis. The PET metabolic tumor volume in the whole body (MTV~WB~) was measured using a semi-automated 3D contouring program on baseline FDG PET/CT scans. The prognostic power for survival status of the PVP staging system was evaluated using the Kaplan–Meier method, Cox regression models, and compared with those of TNM staging system and ln(MTV~WB~) using C-statistic index (Gönen and Heller’s K concordance statistic).
There were 46 cases with stage IA, 43 stage IB, 19 stage IIA, 18 stage IIB, 52 stage IIIA, 39 stage IIIB and 111 stage IV NSCLC. At the end of this investigation, 249 patients had died (88.4%). Median follow-up of 79 lost follow-up and known surviving patients was 58 months. On univariate survival analysis the HR of ln(MTV~WB~) was 1.56, and the HRs of TNM stages 2.25, 1.96, 2.89, 4.24, 4.93 and 7.63 for TNM stages IB, IIA, IIB, IIIA, IIIB and IV in reference to stage IA, respectively. These HRs were used for computing the PVP stage of each patient using following equation; PVP stage = [Hazard ratio of ln(MTV~WB~) × ln(MTV~WB~)] × [Hazard ratios of TNM stage]. There was a statistically significant association of better overall survival with lower PVP stage on both univariate [HR of 1.033 (95%CI =1.027 to1.039)] and multivariate [HR of 1.03 (95%CI =1.02 to1.04)] survival analyses. The range of the PVP stage were 0.06 to 87.57. For comparison with 7[th] edition of TNM stage and ln(MTV~WB~), the PVP stage and ln(MTV~WB~) were divided into 7 groups with similar numbers of patients. The C-statistic value of PVP staging system (mean±SE = 0.70±0.014) was statistically significantly higher than those of TNM stage (0.67 ±0.015, p=0.002) and ln(MTV~WB~) (0.67±0.015, p=0.02) on univariate survival analysis. In multivariate Cox regression models adjusted by patient’s age, gender, treatment types, tumor histology and tumor SUV~max~, the C-statistic value of PVP staging system (mean±SE=0.73±0.013) was also statistically significantly higher than that of TNM stage (0.71 ±0.015, p=0.036).
The PVP staging system from FDG-PET/CT has better prognostic ability and may prove to be a useful prognostic index in NSCLC. It can be treated as a complement to the TNM staging system.
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