Abstract
Stereotactic radiosurgery (SRS) has gained a major role in the treatment of brain tumors. This is based on its ability to precisely and accurately deliver a high dose of radiations to a target, thus effectively ablating all viable tumors while minimizing dose and preventing damage in surrounding normal tissue. Although an increasing number of cancer patients have been treated with hypofractionated stereotactic radiotherapy and radiosurgery in recent years, the biological mechanisms of these new modalities have not been fully elucidated. Furthermore, it appears that different biological mechanisms are involved in radiotherapy treatments using different fractionation schemes. The role of 4Rs and the LQ model appears, therefore, limited in stereotactic body radiation therapy (SBRT) and SRS. A simple calculation based on the radiobiological principles for the conventional multi-fractionated radiotherapy clearly suggests that tumor cell death caused by DNA damages by direct effect of radiation alone cannot account for the high efficacy of SBRT and SRS. Evidence now indicates that SBRT and SRS with doses higher than about 10 Gy per fraction induce severe vascular damages in tumors, which then cause secondary and additional tumor cell death. The ensuing degradation of tumor cells would then release massive tumor-specific antigens, thereby elevating antitumor immune response leading to suppression of recurrence of tumors and metastasis.
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Pontoriero, A. (2020). Radiobiology of Radiosurgery and Hypofractionated Treatments. In: Conti, A., Romanelli, P., Pantelis, E., Soltys, S., Cho, Y., Lim, M. (eds) CyberKnife NeuroRadiosurgery . Springer, Cham. https://doi.org/10.1007/978-3-030-50668-1_12
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