Stereotactic body radiotherapy in patients with lung tumors composed of mainly ground-glass opacity.

Journal of radiation research 2020 May 22

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We retrospectively reviewed the effect of stereotactic body radiation therapy (SBRT) in patients with stage I lung cancer whose lung tumor showed a nodular appearance of ground glass opacity, so-called ground glass nodule (GGN). A total of 84 patients (42 men, 42 women; mean age, 75 years) with stage I lung cancer with GGN accompanying a solid component <50% in diameter of the tumor and no metastases were studied. Concerning histology, 32 tumors were adenocarcinoma, 1 was squamous cell carcinoma, 2 were unclassified carcinoma and 49 cases were histology-unproven but increased in size or had a positive finding in 18F-FDG positron emission tomography (PET) examination. The median tumor size was 20 mm (range, 10-41 mm). All of the patients were treated with SBRT, and the total prescribed dose at the isocenter ranged between 48 Gy in four fractions and 84 Gy in ten fractions. Median follow-up duration was 33 months. No patient had local failure nor regional lymph node failure. The 3-year rate of distant failure was 2.6%. Two patients who experienced distant metastases had a past surgical history of initial lung cancer before SBRT. The rates of cause-specific and overall survival at 3 years were 98.2 and 94.6%, respectively. Treatment-related adverse events of ≥grade 4 were not reported. Although more cases and longer follow-ups are mandatory, SBRT may be one of the radical treatment options for patients with GGN. © The Author(s) 2020. Published by Oxford University Press on behalf of The Japanese Radiation Research Society and Japanese Society for Radiation Oncology. All rights reserved. For Permissions, please email: journals.permissions@oup.com.

Citation

Hiroshi Onishi, Yoshiyuki Shioyama, Yasuo Matsumoto, Yuta Shibamoto, Akifumi Miyakawa, Gen Suzuki, Yasumasa Nishimura, Ryohei Sasaki, Daisuke Miyawaki, Kengo Kuriyama, Takafumi Komiyama, Kan Marino, Shinichi Aoki, Ryo Saito, Masayuki Araya, Yoshiyasu Maehata, Hotaka Nonaka, Licht Tominaga, Masahide Saito, Naoki Sano, Shogo Yamada. Stereotactic body radiotherapy in patients with lung tumors composed of mainly ground-glass opacity. Journal of radiation research. 2020 May 22;61(3):426-430