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Cancer Research and Treatment > Epub ahead of print
doi: https://doi.org/10.4143/crt.2023.876    [Epub ahead of print]
Radiation Oncologists’ Perspectives on Oligometastatic Disease: A Korean Survey Study
Chai Hong Rim1 , Won Kyung Cho2 , Jong Hoon Lee3, Young Seok Kim4, Yang-Gun Suh5, Kyung Hwan Kim6, Ah Ram Chang7, Eui Kyu Chie8 , Yong Chan Ahn2 , on behalf of the Oligometastasis Working Group, Korean Cancer Association
1Department of Radiation Oncology, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea
2Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
3Department of Radiation Oncology, St. Vincent’s Hospital, College of Medicine, The Catholic University of Korea, Suwon, Korea
4Department of Radiation Oncology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
5Department of Radiation Oncology, Proton Therapy Center, Research Institute and Hospital, National Cancer Center, Goyang, Korea
6Department of Radiation Oncology, Yonsei Cancer Center, Yonsei University College of Medicine, Seoul, Korea
7Department of Radiation Oncology/Cyberknife Center, Soonchunhyang University Seoul Hospital, Soonchunhyang University College of Medicine, Seoul, Korea
8Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Korea
Correspondence  Eui Kyu Chie ,Tel: 82-2-2072-3705, Fax: 82-2-742-2073, Email: ekchie93@snu.ac.kr
Yong Chan Ahn ,Tel: 82-2-3410-2612, Fax: 82-2-6190-5882, Email: ahnyc@skku.edu
Received: July 25, 2023;  Accepted: November 20, 2023.  Published online: November 22, 2023.
*Chai Hong Rim and Won Kyung Cho contributed equally to this work.
Perspectives of radiation oncologists on oligometastatic disease was investigated using multi-layered survey.
Materials and Methods
Online survey on the oligometastatic disease was distributed to the board-certified regular members of the Korean Society for Radiation Oncology. The questionnaire consisted of four domains: five questions on demographics; five on the definition of oligometastatic disease; four on the role of local therapy; and three on the oligometastatic disease classification, respectively.
A total of 135 radiation oncologists participated in the survey. The median length of practice after board certification was 22.5 years (range, 1 to 44 years), and the vast majority (94.1%) answered affirmatively to the clinical experience in oligometastatic disease management. Nearly two-thirds of the respondents considered the number of involved organs as an independent factor in defining oligometastasis. Most frequently perceived upper limit on the numerical definition of oligometastasis was 5 (64.2%), followed by 3 (26.0%), respectively. Peritoneal and brain metastasis were nominated as the sites to be excluded from oligometastastic disease by 56.3% and 12.6% of the participants, respectively. Vast majority (82.1%) agreed on the role of local treatment in the management of oligometastatic disease. Majority (72%) of the participants acknowledged the European Society for Radiotherapy and Oncology (ESTRO)–European Organisation for Research and Treatment of Cancer (EORTC) classification of oligometastatic disease, however, only 43.3% answered that they applied this classification in their clinical practice. Underlying reasons against the clinical use were ‘too complicated’ (66.0%), followed by ‘insufficient supporting evidence’ (30.0%), respectively.
While most radiation oncologists supported the role of local therapy in oligometastatic disease, there were several inconsistencies in defining and categorizing oligometastatic disease. Continued education and training on oligometastatic disease would be also required to build consensus among participating caregivers.
Key words: Oligometastasis, Radiotherapy, Surveys and questionnaires
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