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Y. Matsumoto



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    ORAL 19 - Radiation for Localized Lung Cancer (ID 126)

    • Event: WCLC 2015
    • Type: Oral Session
    • Track: Treatment of Localized Disease - NSCLC
    • Presentations: 1
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      ORAL19.05 - Japanese Multicenter Study of Stereotactic Body Radiotherapy for 661 Medically Operable Patients with Stage I Non-Small Cell Lung Cancer (ID 2835)

      11:28 - 11:39  |  Author(s): Y. Matsumoto

      • Abstract
      • Presentation
      • Slides

      Background:
      In Japan, stereotactic body radiotherapy (SBRT) has been actively used as a curative treatment option for patients with early stage primary lung cancer. We organized a multi-institutional SBRT study group in Japanese Radiological Society (JRS-SBRTSG) and conducted retrospective study of SBRT for stage I non-small cell lung cancer (NSCLC).. The purpose of this study was to evaluate the treatment outcomes of SBRT for medically operable patients with stage I NSCLC of JRS-SBRTSG.

      Methods:
      This is a retrospective analysis to review 661 patients (median age, 75 years; male 424, female 237) with stage I (IA 506, IB 155) NSCLC treated in 20 institutions of JRS-SBRTSG. Histology was proven in 486 patients (adenocarcinoma 328, squamous cell carcinoma 117, others 41). A total dose of 32 -70 Gy mainly at the isocenter was prescribed in 4-15fractions. The median calculated biological effective dose (BED) was 107 Gy (range, 64-150 Gy) based on alpha/beta = 10Gy)

      Results:
      The median follow-up period for all patients was 35 months. Pulmonary complications of NCI-CTC criteria grade > 3 and grade 5 were noted in 1.9% and 0.4% of total patients, respectively. Overall survival rate (OS) at three year (OS-3y) and disease-specific survival rate at three year of total patients was 79% and 89%, respectively. Locally progression free rate at three year was better for T1 (89%) than T2 (80%) but OS-3y was not different in the two subgroups. OS-3y of female patients was much better (93%) than for male patients (72%) (P<0.01). OS-3y was better for BED ³100 Gy subgroup (80%) than BED<100 Gy subgroup (70%). OS-3y of patients accompanying pulmonary interstitial change (n=54) was much worse (42%) than the others. According to multivariate analysis, only of male and presence of pulmonary interstitial change were worse survival factor.

      Conclusion:
      The outcomes of SBRT for medically operable patients with stage I NSCLC in Japanese multi-institutional large database were retrospectively analyzed. The local progression-free rate and OS were similar to those of JCOG (Japan Clinical Oncology Group) 0403; a prospective phase II study of SBRT (48 Gy in 4 fractions) for stage IA NSCLC, and the OS was almost comparable to that of surgery for high-aged patients. The subgroup of male and presence of pulmonary interstitial change were worse survival factors. SBRT might be promising as an alternative to surgery for operable stage I NSCLC

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