Analyses of the local control of pulmonary Oligometastases after stereotactic body radiotherapy and the impact of local control on survival

Takaya Yamamoto, Yuzuru Niibe, Masahiko Aoki, Takashi Shintani, Kazunari Yamada, Mitsuru Kobayashi, Hideomi Yamashita, Masatoki Ozaki, Yoshihiko Manabe, Hiroshi Onishi, Katsuya Yahara, Atsushi Nishikawa, Kuniaki Katsui, Ryoong Jin Oh, Atsuro Terahara, Keiichi Jingu

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Successful local therapy for oligometastases may lead to longer survival. The purpose of this multicentre retrospective study was to investigate factors affecting the local control (LC) of pulmonary oligometastases treated by stereotactic body radiotherapy (SBRT) and to investigate the impact of LC on survival. Methods: The inclusion criteria included 1 to 5 metastases, the primary lesion and other extrathoracic metastases were controlled before SBRT, and the biological effective dose (BED10) of the SBRT was 75 Gy or more. The Cox proportional hazards model was used for analyses. Results: Data of 1378 patients with 1547 tumours from 68 institutions were analysed. The median follow-up period was 24.2 months. The one-year, 3-year and 5-year LC rates were 92.1, 81.3 and 78.6%, respectively, and the 1-year, 3-year and 5-year overall survival rates were 90.1, 60.3 and 45.5%, respectively. Multivariate analysis for LC showed that increased maximum tumour diameter (p = 0.011), type A dose calculation algorithm (p = 0.005), shorter overall treatment time of SBRT (p = 0.035) and colorectal primary origin (p < 0.001 excluding oesophagus origin) were significantly associated with a lower LC rate. In the survival analysis, local failure (p < 0.001), worse performance status (1 vs. 0, p = 0.013; 2–3 vs. 0, p < 0.001), oesophageal primary origin (vs. colorectal origin, p = 0.038), squamous cell carcinoma (vs. adenocarcinoma, p = 0.006) and increased maximum tumour diameter (p < 0.001) showed significant relationships with shorter survival. Conclusions: Several factors of oligometastases and SBRT affected LC. LC of pulmonary oligometastases by SBRT showed a significant survival benefit compared to patients with local failure.

Original languageEnglish
Article number997
JournalBMC cancer
Volume20
Issue number1
DOIs
Publication statusPublished - Dec 1 2020

Keywords

  • Local control
  • Metastasis-directed therapy
  • Oligo-recurrence
  • Pulmonary oligometastases
  • Stereotactic body radiotherapy
  • Sync-oligometastases

ASJC Scopus subject areas

  • Genetics
  • Oncology
  • Cancer Research

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