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P. Van De Vaart



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    ORAL 20 - Chemoradiotherapy (ID 124)

    • Event: WCLC 2015
    • Type: Oral Session
    • Track: Treatment of Locoregional Disease – NSCLC
    • Presentations: 1
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      ORAL20.03 - Radiation Dose Escalation in Patients with Locally Advanced Non-Small Cell Lung Cancer; 60 Month Follow-Up of a Randomized Phase II Trial (ID 1190)

      11:07 - 11:18  |  Author(s): P. Van De Vaart

      • Abstract
      • Presentation
      • Slides

      Background:
      Concurrent chemoradiotherapy imposes beneficial effects on overall survival (OS) in patients with locally advanced non-small cell lung cancer (NSCLC). Nonetheless, the optimal radiation scheme still needs to be identified. The RTOG 0617 trial showed that patients receiving a high dose radiation scheme (37 x 2 Gy) had a significant shorter median OS (22.9 months) as compared to patients receiving a conventional 30 x 2 Gy radiation scheme (28.7 months). Dose escalation using hypo-fractionation however seems promising and might contribute to a better OS. We investigated long term OS in locally advanced NSCLC patients treated with concurrent chemoradiotherapy, using a hypo-fractionation scheme of 24 x 2.75 Gy +/- Cetuximab.

      Methods:
      A 2-armed phase II, multi-center study (NTR2230) was performed with the initial aim to assess the effect of the addition of Cetuximab to concurrent chemoradiotherapy in locally advanced NSCLC patients. Arm A received high dose radiotherapy (24 x 2.75 Gy) and concurrent daily low-dose cisplatin (6 mg/m[2]). Arm B received an identical treatment regimen with the addition of weekly Cetuximab (400 mg/m[2] loading dose one week prior to radiotherapy followed by weekly 250 mg/m[2]). Mortality follow-up information was completed until January 2015. Overall survival (OS) rates were calculated as time from randomization until death from any cause. Kaplan-Meier survival curves were plotted and 1-, 2- and 5-year OS proportions were calculated.

      Results:
      Between February 2009 and May 2011, 102 patients were randomly allocated in two arms; 51 patients (50%) in arm A and 51 patients (50%) in arm B. Follow-up information was available for 101 patients (99%). Median OS was 33.0 months (interquartile (IQ) range 20.0 to 46.0) and did not significantly differ between the two arms; 33.0 months (IQ-range 13.8 to 52.2) in Arm A and 30.0 months (IQ-range 15.3 to 44.7) in Arm B (Figure 1). 1-,2- and 5-year OS was 75.5%, 59.8% and 36.6%, respectively. Figure 1



      Conclusion:
      In this 2-armed phase II trial in NSCLC patients receiving concurrent chemoradiotherapy, the addition of Cetuximab to concurrent chemoradiotherapy did not improve 60-month OS in unselected patients with locally advanced NSCLC, in line with the RTOG 0617. However, the median OS was remarkably high when compared to the RTOG 0617: 30 and 33 months versus 23 and 29 months, respectively. Furthermore, 5-year OS was still 36.6%. Dose escalation using hypo-fractionation of 2.75 Gy per fraction might be one of the factors contributing to extended OS in patients with locally advanced NSCLC.

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