PMID- 30836165 OWN - NLM STAT- MEDLINE DCOM- 20210804 LR - 20210804 IS - 1879-355X (Electronic) IS - 0360-3016 (Linking) VI - 110 IP - 1 DP - 2021 May 1 TI - Biological Principles of Stereotactic Body Radiation Therapy (SBRT) and Stereotactic Radiation Surgery (SRS): Indirect Cell Death. PG - 21-34 LID - S0360-3016(19)30291-3 [pii] LID - 10.1016/j.ijrobp.2019.02.047 [doi] AB - PURPOSE: To review the radiobiological mechanisms of stereotactic body radiation therapy stereotactic body radiation therapy (SBRT) and stereotactic radiation surgery (SRS). METHODS AND MATERIALS: We reviewed previous reports and recent observations on the effects of high-dose irradiation on tumor cell survival, tumor vasculature, and antitumor immunity. We then assessed the potential implications of these biological changes associated with SBRT and SRS. RESULTS: Irradiation with doses higher than approximately 10 Gy/fraction causes significant vascular injury in tumors, leading to secondary tumor cell death. Irradiation of tumors with high doses has also been reported to increase the antitumor immunity, and various approaches are being investigated to further elevate antitumor immunity. The mechanism of normal tissue damage by high-dose irradiation needs to be further investigated. CONCLUSIONS: In addition to directly killing tumor cells, high-dose irradiation used in SBRT and SRS induces indirect tumor cell death via vascular damage and antitumor immunity. Further studies are warranted to better understand the biological mechanisms underlying the high efficacy of clinical SBRT and SRS and to further improve the efficacy of SBRT and SRS. CI - Copyright (c) 2019 Elsevier Inc. All rights reserved. FAU - Song, Chang W AU - Song CW AD - Department of Radiation Oncology, University of Minnesota Medical School, Minneapolis, Minnesota. Electronic address: songx001@umn.edu. FAU - Glatstein, Eli AU - Glatstein E AD - Department of Radiation Oncology, University of Pennsylvania, Philadelphia, Pennsylvania. FAU - Marks, Lawrence B AU - Marks LB AD - Department of Radiation Oncology, University of North Carolina, Chapel Hill, North Carolina. FAU - Emami, Bahman AU - Emami B AD - Department of Radiation Oncology, Loyola University Medical Center, Chicago, Illinois. FAU - Grimm, Jimm AU - Grimm J AD - Department of Radiation Oncology and Molecular Radiation Sciences, Johns Hopkins University, Baltimore, Maryland. FAU - Sperduto, Paul W AU - Sperduto PW AD - Minneapolis Radiation Oncology and Gamma Knife Center, University of Minnesota, Minneapolis, Minnesota. FAU - Kim, Mi-Sook AU - Kim MS AD - Department of Radiation Oncology, Korea Institute of Radiological & Medical Sciences, Seoul, Korea. FAU - Hui, Susanta AU - Hui S AD - Department of Radiation Oncology, University of Minnesota Medical School, Minneapolis, Minnesota. FAU - Dusenbery, Kathryn E AU - Dusenbery KE AD - Department of Radiation Oncology, University of Minnesota Medical School, Minneapolis, Minnesota. FAU - Cho, L Chinsoo AU - Cho LC AD - Department of Radiation Oncology, University of Minnesota Medical School, Minneapolis, Minnesota. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review DEP - 20190302 PL - United States TA - Int J Radiat Oncol Biol Phys JT - International journal of radiation oncology, biology, physics JID - 7603616 SB - IM CIN - Int J Radiat Oncol Biol Phys. 2021 May 1;110(1):252-253. PMID: 33243480 CIN - Int J Radiat Oncol Biol Phys. 2021 May 1;110(1):251-252. PMID: 33243481 CIN - Int J Radiat Oncol Biol Phys. 2021 May 1;110(1):253-254. PMID: 33864825 MH - Animals MH - Blood Vessels/pathology/radiation effects MH - Carcinoma 256, Walker/blood supply/pathology/radiotherapy MH - *Cell Death/genetics MH - Cell Survival/radiation effects MH - DNA Damage MH - Dose Fractionation, Radiation MH - Endothelium, Vascular/cytology MH - Humans MH - Immunogenic Cell Death MH - Mice MH - Mice, Nude MH - Neoplasms/blood supply/immunology/*radiotherapy MH - Organs at Risk/blood supply/radiation effects MH - Radiobiology MH - Radiosurgery/*methods MH - Rats MH - Tumor Hypoxia/radiation effects MH - Xenograft Model Antitumor Assays EDAT- 2019/03/06 06:00 MHDA- 2021/08/05 06:00 CRDT- 2019/03/06 06:00 PHST- 2019/02/13 00:00 [received] PHST- 2019/02/13 00:00 [revised] PHST- 2019/02/14 00:00 [accepted] PHST- 2019/03/06 06:00 [pubmed] PHST- 2021/08/05 06:00 [medline] PHST- 2019/03/06 06:00 [entrez] AID - S0360-3016(19)30291-3 [pii] AID - 10.1016/j.ijrobp.2019.02.047 [doi] PST - ppublish SO - Int J Radiat Oncol Biol Phys. 2021 May 1;110(1):21-34. doi: 10.1016/j.ijrobp.2019.02.047. Epub 2019 Mar 2.