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Feiying Gu



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    OA01 - Improving Outcomes in Locoregional NSCLC I (ID 892)

    • Event: WCLC 2018
    • Type: Oral Abstract Session
    • Track: Treatment of Locoregional Disease - NSCLC
    • Presentations: 1
    • Moderators:
    • Coordinates: 9/24/2018, 10:30 - 12:00, Room 107
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      OA01.02 - The Estimate of Shrinking Field and SIB Radiotherapy Guided by 18F-FDG PET/CT in Locally Advanced NSCLC Patients: A Phase 2 Randomized Clinical (ID 14474)

      10:40 - 10:50  |  Author(s): Feiying Gu

      • Abstract
      • Presentation
      • Slides

      Background

      Tumor control remains suboptimal in locally advanced lung cancer. Radiation dose acceleration has a positive effect to local tumor control, but is limited by radiation-induced lung injury (RILI). The aim of this study was to evaluate the safety and efficacy of adaptive radiation therapy guided by functional imaging 18F-FDG PET/CT in patients with locally advanced non-small lung cancer.

      a9ded1e5ce5d75814730bb4caaf49419 Method

      A total number of 72 patients with locally advanced NSCLC were enrolled between November 2012 and June 2017. After signing the inform consent form, 36 patients were randomized into the shrinking field and simultaneous integrated boost radiotherapy group, others were in the conventional radiotherapy group. The Objective Response rate (ORR), progression-free survival (PFS) and overall survival (OS) were compared, as well as the safety of shrinking field and simultaneous integrated boost radiotherapy (radiological dosimetry parameters and the incidence of grade 2 or higher radiotherapy-related toxicity). T-test was utilized to compare the differences between the quantitative data of two groups, while chi-square test or Fisher exact test were utilized to compare the differences between the count data of two groups. Kaplan-Meier curve was utilized to show PFS and OS, and the log-rank test analysis was utilized to compare the survival difference between two groups. P value less than 0.05 was considered statistical difference.

      4c3880bb027f159e801041b1021e88e8 Result

      All the patients in both two groups had completed their treatment according to the study protocol. The shrinking field and simultaneous integrated boost radiotherapy group was significantly greater than the conventional radiotherapy group in ORR (77.8% vs. 52.8%, P=0.026). The median OS and PFS in shrinking field and simultaneous integrated boost radiotherapy group was 22.0 months (95%CI:18.1~25.9) and 12.4 months (95%CI:10.4~14.3), which is significantly longer than 18.1 months (95%CI:12.4~23.8) and 8.2 months (95%CI:5.2~11.2) in the conventional radiotherapy group (P=0.045 and P=0.013). There was no significant difference between the two groups in radiological metrological parameters and organ at risk (OAR). The incidence of grade 2 or higher RILI, radiation-induced esophagitis, radiation-related myocardial damage and myelosuppression between two groups has no statistically significant difference.

      8eea62084ca7e541d918e823422bd82e Conclusion

      Shrinking field and simultaneous integrated boost radiotherapy guided by function imaging 18F-FDG PET/CT is a safe and operable technique in practice. It can improve ORR, OS and PFS without increasing the risk of radiotherapy-related toxicity in patients with locally advanced NSCLC.

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