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C.B. Simone

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    MO09 - Mesothelioma I (ID 120)

    • Event: WCLC 2013
    • Type: Mini Oral Abstract Session
    • Track:
    • Presentations: 1
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      MO09.13 - Comparison of Three Radiographic Tumor Volume Estimation Techniques for Malignant Pleural Mesothelioma: Their Correlation with Each Other, Actual Measured Intraoperative Tumor Volumes, and Survival (ID 1689)

      16:15 - 17:45  |  Author(s): C.B. Simone

      • Abstract
      • Presentation
      • Slides

      Studies have assessed correlation between radiographically estimated tumor volume (TV) and outcomes for malignant pleural mesothelioma, no standard radiographic model exists for estimating TV. Although radical pleurectomy yields a surgical specimen essentially all cancer, thereby allowing accurate determination of TV, empirically-derived intraoperative TVs have never been reported. We compare multiple radiographic estimates of TV with TVs determined at resection to determine which radiographic approach most accurately predicts intraoperative TV, and we correlate TV with survival.

      Actual TVs were measured for 41 consecutive radical pleurectomy specimens by volume displacement. Radiographic TV estimates were performed by radiologists/radiation oncologists blinded to intraoperative TVs. Radiographic estimates were obtained with: Live Wire algorithm (automated tumor delineation after manual algorithm training), radiology TeraRecon (tumor automatically circumscribed with subsequent manual tracing corrections), and radiation oncology Eclipse (non-automated tumor delineation).

      Median age was 63yrs, with 80% male and 83% having epithelial histology. Stage distribution was: 3-Stage I (7%), 4-Stage II (10%), 29-Stage III (71%), and 5-Stage IV (12%). Median (interquartile range) intraoperative TV was 600(400,800)cm[3]. Median TV of 800(575,1100)cm[3] among nonepithelial compared to 500(350,838)cm[3] for epithelial was not significantly difference (p=0.099). TVs were largest for stage III (p=0.01). Median TVs for Live Wire, TerraRecon, and Eclipse were 260(147-452), 293(161-465), and 447(247-559)cm[3], respectively. Pearson correlation coefficients were 0.60, 0.75, and 0.78, with all models underestimating intraoperative TVs (Figure 1A). Among 34 epithelial patients (mean/median follow-up 9.8/8.0mo), median survival was not reached (only 9 recurrences). Epithelial patients with large (>500cm[3]) intraoperative TVs had numerically worse progression-free (p=0.148) and overall (p=0.161) survival than patients with TVs ≤500cm[3](Figure 1B), but limited events precluded statistical significance. Larger radiologic TVs similarly correlated with shorter survivals. Figure 1

      This is the first study to compare radiographic estimates of TV to actual TV determined by volume displacement of radical pleurectomy specimens, arguably the TV measurement gold standard. This study is also the first to compare estimated TVs using multiple established and previously reported radiographic techniques. Our results demonstrate a clear trend toward greater overall and progression-free survival for actual TVs <500cm[3]. All radiographic techniques underestimated actual TV, with estimates progressively closer to the actual volume with each technique as they became less automated and more manual. Further analysis is ongoing to determine if any radiographic method can serve as an accurate surrogate for actual TV and if models correlate as closely with outcomes as actual TVs.

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