Journal of Korean Neurosurgical Society

  • 제64권6호
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  • Pages.983-994
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  • 2021
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  • 2005-3711(pISSN)
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  • 1598-7876(eISSN)
대한신경외과학회 (The Korean Neurosurgical Society)
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The Tumor Control According to Radiation Dose of Gamma Knife Radiosurgery for Small and Medium-Sized Brain Metastases from Non-Small Cell Lung Cancer

  • Park, Sue Jee (Department of Neurosurgery, Chonnam National University Hwasun Hospital, Chonnam National University Medical School) ;
  • Lim, Sa-Hoe (Department of Neurosurgery, Chonnam National University Hwasun Hospital, Chonnam National University Medical School) ;
  • Kim, Young-Jin (Department of Neurosurgery, Chonnam National University Hwasun Hospital, Chonnam National University Medical School) ;
  • Moon, Kyung-Sub (Department of Neurosurgery, Chonnam National University Hwasun Hospital, Chonnam National University Medical School) ;
  • Kim, In-Young (Department of Neurosurgery, Chonnam National University Hwasun Hospital, Chonnam National University Medical School) ;
  • Jung, Shin (Department of Neurosurgery, Chonnam National University Hwasun Hospital, Chonnam National University Medical School) ;
  • Kim, Seul-Kee (Department of Radiology, Chonnam National University Hwasun Hospital, Chonnam National University Medical School) ;
  • Oh, In-Jae (Department of Internal Medicine, Chonnam National University Hwasun Hospital, Chonnam National University Medical School) ;
  • Hong, Jong-Hwan (Department of Neurosurgery, Chonnam National University Hwasun Hospital, Chonnam National University Medical School) ;
  • Jung, Tae-Young (Department of Neurosurgery, Chonnam National University Hwasun Hospital, Chonnam National University Medical School)
  • 투고 : 2021.07.05
  • 심사 : 2021.09.07
  • 발행 : 2021.11.01
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초록

Objective : The effectiveness of gamma knife radiosurgery (GKR) in the treatment of brain metastases is well established. The aim of this study was to evaluate the efficacy and safety of maximizing the radiation dose in GKR and the factors influencing tumor control in cases of small and medium-sized brain metastases from non-small cell lung cancer (NSCLC). Methods : We analyzed 230 metastatic brain tumors less than 5 mL in volume in 146 patients with NSCLC who underwent GKR. The patients had no previous radiation therapy for brain metastases. The pathologies of the tumors were adenocarcinoma (n=207), squamous cell carcinoma (n=18), and others (n=5). The radiation doses were classified as 18, 20, 22, and 24 Gy, and based on the tumor volume, the tumors were categorized as follows : small-sized (less than 1 mL) and medium-sized (1-3 and 3-5 mL). The progression-free survival (PFS) of the individual 230 tumors and 146 brain metastases was evaluated after GKR depending on the pathology, Eastern Cooperative Oncology Group (ECOG) performance score (PS), tumor volume, radiation dose, and anti-cancer regimens. The radiotoxicity after GKR was also evaluated. Results : After GKR, the restricted mean PFS of individual 230 tumors at 24 months was 15.6 months (14.0-17.1). In small-sized tumors, as the dose of radiation increased, the tumor control rates tended to increase (p=0.072). In medium-sized tumors, there was no statistically difference in PFS with an increase of radiation dose (p=0.783). On univariate analyses, a statistically significant increase in PFS was associated with adenocarcinomas (p=0.001), tumors with ECOG PS 0 (p=0.005), small-sized tumors (p=0.003), radiation dose of 24 Gy (p=0.014), synchronous lesions (p=0.002), and targeted therapy (p=0.004). On multivariate analyses, an improved PFS was seen with targeted therapy (hazard ratio, 0.356; 95% confidence interval, 0.150-0.842; p=0.019). After GKR, the restricted mean PFS of brain at 24 months was 9.8 months (8.5-11.1) in 146 patients, and the pattern of recurrence was mostly distant within the brain (66.4%). The small and medium-sized tumors treated with GKR showed radiotoxicitiy in five out of 230 tumors (2.2%), which were controlled with medical treatment. Conclusion : The small-sized tumors were effectively controlled without symptomatic radiation necrosis as the radiation dose was increased up to 24 Gy. The medium-sized tumors showed potential for symptomatic radiation necrosis without signifcant tumor control rate, when greater than 18 Gy. GKR combined targeted therapy improved the tumor control of GKR-treated tumors.

키워드

과제정보

This study was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Science, ICT, & Future Planning (2020R1I1A3073338).

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