Author of

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  MA05 - Improving Outcomes in Locoregional NSCLC II (ID 901)

  • Event: WCLC 2018
  • Type: Mini Oral Abstract Session
  • Track: Treatment of Locoregional Disease - NSCLC
  • Presentations: 1
  • Moderators:
  • Coordinates: 9/24/2018, 13:30 - 15:00, Room 105

  • 25796

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    MA05.09 - PFS and Cardiac-Toxicity-Adjusted-PFS As Predictors of OS in Locally Advanced NSCLC Treated with Concurrent Chemoradiation (ID 12391)

    14:30 - 14:35  |  Author(s): James Dignam
    • Abstract
    • Presentation
    • Slides

    Background
    

    Overall survival (OS) is the gold standard for LA-NSCLC with chemoradiation (CCRT), while the complex relationships among RT dosimetry, systemic therapies, cardiopulmonary toxicity, progression (PD) and OS are also of increasing scientific and clinical interest.

    a9ded1e5ce5d75814730bb4caaf49419 Method
    

    NRG Oncology RTOG 0617 (NCT00533949) was a randomized phase 3 trial comparing standard (SD, 60 Gy) versus high-dose (HD, 74 Gy) CCRT +/- cetuximab from 11/07-06/11. This secondary analysis includes 469 patients (pts) given ≥50 Gy. A PFS event was defined as the first occurrence of local, regional, distant PD or death w/o documented PD. A CTA-PFS event was the first occurrence of grade 2+ treatment-related cardiac toxicity event or a PFS event. Landmark analyses at 6mo and 12mo were used to minimize the immortal time bias. Cox model with PD or CT/PD as a time-dependent covariate was used to evaluate their predictive roles. Median f/u time for surviving pts was 5.1 years.

    4c3880bb027f159e801041b1021e88e8 Result
    

    As previously reported, pts treated with HD had significantly lower OS rates (HR=1.28, 95%CI: 1.04-1.58, p=0.018) and CTA-PFS rates (HR=1.24, 95%CI: 1.02-1.51, p=0.035), and marginally lower PFS rates (HR=1.21, 95%CI: 0.99-1.47, p=0.06) than pts treated with SD. Median survival time (MST) among pts having PD within 6mo versus not were 13.4mo (95%CI: 10.0-19.0mo) and 30.7mo (95%CI: 28.0-37.0mo) (p<0.001). MST for pts having PD within 12mo versus not were 20.6mo (95%CI: 18.8-25.0mo) and 60mo (95%CI: 47.6-74.5mo)(p<0.001). Results are similar when using CTA-PFS with 6mo or 12mo cutoff (p<0.001). RT dose was no longer significantly associated with OS (p=0.08 or p=0.15) when PD or CT/PD was included in multivariable analysis (p<0.001), suggesting OS differences in HD/SD may be partially captured by PFS or CTA-PFS.

    8eea62084ca7e541d918e823422bd82e Conclusion
    

    Long-term survival results from RTOG 0617 suggest that PFS (or CTA-PFS) status at 6mo or 12mo predicts long-term OS, and may potentially be considered as a surrogate endpoint of OS in clinical trials. Pts who were progression-free at 12mo had a MST of 5 years. Further validation on external datasets and in the modern era of immunotherapy are needed.

    Funding: This project was supported by grants NCORP (UG1CA189867), NRG Operations (U10CA180868), NRG SDMC (U10CA180822), IROC (U24CA180803), and CTEP from the National Cancer Institute (NCI).

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