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REVIEW

Stereotactic body radiotherapy in ultracentrally located lung tumors

Melek Yakar1*
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1 Department of Radiation Oncology, Faculty of Medicine, Eskişehir Osmangazi University, Eskişehir, Eskişehir Province, Turkey
CP 2024, 6(3), 3683
Submitted: 16 May 2024 | Accepted: 25 June 2024 | Published: 30 August 2024
© 2024 by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )
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Abstract

Stereotactic body radiotherapy (SBRT) is a highly conformal radiotherapy technique that delivers high doses of radiation per fraction, typically in 1 – 5 fractions. It is a standard treatment option for patients with early-stage non-small cell lung cancer that is peripherally located, for those who are medically inoperable, or for patients who do not opt for surgery. Similarly, SBRT is considered an effective treatment option for oligometastatic lung tumors. However, in the case of ultracentrally located lung tumors—tumors situated close to the central airway and mediastinal region—there is an increased risk of severe toxicities (grade 4 – 5) due to the dose tolerances of the surrounding organs at risk. The definition of ultracentrally located lung tumors remains unclear. Some studies define an ultracentral lung tumor as one in which the gross tumor volume directly involves the proximal bronchial tree or trachea, while others define it as the planning target volume (PTV) that includes the trachea or main bronchial system. In addition, some studies consider tumors whose PTV touches or overlaps with the central bronchial tree, esophagus, pulmonary vein, or pulmonary artery as ultracentral. In addition, the optimal SBRT regime and organ-at-risk dose limitations for ultracentral tumors have yet to be clearly established. The aim of this review is to explore and discuss the role of SBRT in the treatment of ultracentrally located lung tumors.

Keywords
Ultracentral lung tumors
Stereotactic body radiotherapy
Oncological results
Toxicity
Funding
None.
Conflict of interest
The author declares no competing interests in this article.
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Cancer Plus, Electronic ISSN: 2661-3840 Print ISSN: 2661-3832, Published by AccScience Publishing
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