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M. Orringer



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    MO25 - NSCLC - Combined Modality Therapy II (ID 112)

    • Event: WCLC 2013
    • Type: Mini Oral Abstract Session
    • Track: Mesothelioma
    • Presentations: 1
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      MO25.10 - A Phase II trial of mid-treatment FDG-PET adaptive, individualized radiation therapy plus concurrent chemotherapy in patients with inoperable non-small cell lung cancer (NSCLC) (ID 3461)

      11:25 - 11:30  |  Author(s): M. Orringer

      • Abstract
      • Presentation
      • Slides

      Background
      We hypothesized that individualized radiation treatment targeting to the FDG-avid tumor identified mid-treatment would improve local tumor control.

      Methods
      This is a phase II trial for patients with inoperable/unresectable NSCLC. Conformal radiotherapy (RT) was given in 30 daily fractions. RT dose was individualized to a fixed rate of grade >2 lung toxicity and adaptively escalated to the residual tumor on mid-tx FDG-PET upto a total dose of 86 Gy. Patients were given concurrent weekly followed by consolidation carboplatin/paclitaxel. The primary endpoint was local-regional tumor control (LRTC) and local-regional progression free survival (LRPFS) at 2 years.

      Results
      42 patients were enrolled: median age 63 years (range 45-83); 28 (67%) male; 39 (93%) smokers; 38 (92%) stage III; and 45% squamous cell. Median physical dose reached was 83 Gy (range 63-86 Gy), equivalent to 90 Gy in 2 Gy fractions (biological effective dose 107 Gy). Minimum and median follow-up were 9 and 27 months, respectively. The 2-year rates of in-field LRTC, overall LRTC, and LR-PFS were 84% (62-94%), 61% (39-77%), and 37% (22-52%), respectively. 15 patients progressed: 2 (13%) at primary tumor alone; 4 (27%) first at distant sites alone; 2 (13%) at nodal regions alone; 5 (33%) at both distant sites and nodal regions; 1 (7%) at both distant site and primary tumor; 1 (7%) at both nodal region and primary tumor. Median overall survival was 22 months (10-33 months) and 2-year overall survival rate was 49% (32-63%). These results compared favorably to stage-matched patients treated with standard-dose RT in our center 2-year overall survival 23% (8-41%) during the same time period.

      Conclusion
      Adapting RT by targeting high dose radiation to the FDG avid region detected mid-treatment provides outstanding 2-year local-regional tumor control. RTOG 1106 is currently testing this regimen in a randomized fashion.

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