Author of

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  O10 - Stereotactic Ablative Body Radiotherapy (ID 104)

  • Event: WCLC 2013
  • Type: Oral Abstract Session
  • Track: Radiation Oncology + Radiotherapy
  • Presentations: 1
  • Moderators:H. Onishi, J.Y. Chang
  • Coordinates: 10/28/2013, 16:15 - 17:45, Parkside 110 A+B, Level 1

  • 11391

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    O10.02 - Radiation Therapy Oncology Group (RTOG) protocol 0915: A randomized phase II study comparing 2 Stereotactic Body Radiation Therapy (SBRT) schedules for medically inoperable patients (pts) with stage I peripheral Non-Small Cell Lung Cancer. (ID 68)

    16:25 - 16:35  |  Author(s): W. Parker
    • Abstract
    • Presentation
    • Slides

    Background
    To select the most favorable treatment regimen based on the rate of grade 3 or higher protocol-specified adverse events (psAEs) at 1 year.

    Methods
    Pts with documented baseline medical conditions precluding lobectomy and biopsy-proven peripheral (greater than 2 cm from the central bronchial tree) T1/T2, N0 (clinically node negative by PET), M0 tumors were eligible. Patients (pts) were randomized to receive either 34 Gy in one fraction (arm 1) or 48 Gy in 4 consecutive once-daily fractions (arm 2). Rigorous central accreditation and quality assurance assessments were used to assure pts were treated according to protocol guidelines. The study was designed to detect whether psAEs rate>17% at a 10% significance level (1-sided) and 90% power. Secondary endpoints included primary tumor control (PC) rate, 1-year overall survival (OS), progression-free survival (PFS). The regimen selection criteria were based on pre-specified rules of psAEs and PC for each arm. Formal comparisons were not performed.

    Results
    The study opened in September 2009 and closed in March 2011 after accruing a total of 94 pts. Median follow up was 20.6 months. Of 86 evaluable pts, 41 were in arm 1 and 45 in arm 2. Baseline pt and tumor characteristics were balanced between both arms. 4 (9.8%) pts on arm 1 (95% CI: 2.7-23.1%; p=0.151) and 6 (13.3%) pts on arm 2 (95% CI: 5.1-26.8%; p=0.337) experienced psAEs. 39 (95.1%) pts on arm 1 and 45 (100%) pts on arm 2 received planned SBRT treatment. Contouring compliance indicated 100% and 95.6% of targets and 89.5% and 82.2% of normal tissue structures were outlined per protocol/minor deviations, for arms 1 and 2, respectively. OS at 1 year was 85.4% (95% CI: 70.3-93.1%) for arm 1 pts and 91.1% (95% CI: 78.0-96.6%) for arm 2. PFS at 1 year was 78.0% (95% CI: 62.1-87.9%) for arm 1 and 84.4% (95% CI: 70.1-92.3%) for arm 2. The PC rates at 1 year were 97.1% (95% CI: 85.1-99.9%) for arm 1 and 97.6% (95% CI: 87.1-99.9%) for arm 2.

    Conclusion
    At one year, 34 Gy in one fraction met pre-specified criteria with respect to adverse events and primary control, and therefore is selected as the experimental arm for a planned phase III trial. Supported by RTOG U10 CA21661 and CCOP U10 CA37422 grants from NCI.

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