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Interfractional change of tumor volume during fractionated stereotactic radiotherapy using gamma knife for brain metastases

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Abstract

Purpose

Fractionated stereotactic radiotherapy (FSRT) using gamma knife is useful for brain metastases. However, several uncertainties derived from fractionation pose issues for maintaining high-level accuracy. This study analyzed interfractional tumor change by performing radiological reassessment at the midterm of FSRT with ≥ 10 fractions, and the significance of replanning was evaluated.

Methods

Data of FSRT using gamma knife with ≥ 10 fractions were retrospectively collected. Interfractional volume changes in MRI at the midterm of the irradiation period were analyzed. Radiological changes after FSRT and final outcomes were also investigated.

Results

Overall, 114 lesions in 74 treatments from 66 patients were included, with previously irradiated lesions accounting for 46%. The median interval between planning and the interfractional MRI was 7 days. The interfractional change rates of tumor volume ranged from − 48 to + 72%. Significant interfractional enlargement was observed in 16 lesions (14%); evident regression was confirmed in 17 lesions (15%). Predictive factors for interfractional enlargement were small tumor and cystic lesion; high biologically effective dose was associated with regression. After FSRT, most lesions regressed within 6 months despite interfractional change type. The incidences of tumor control and radiation necrosis indicated no differences between interfractionally-regressed lesions and others.

Conclusion

This is the first study to evaluate interfractional tumor change in FSRT using gamma knife with ≥ 10 fractions, indicating significant volume changes in 29% of the lesions. These preliminary results suggest that interfractional reassessment of a treatment plan in FSRT with irradiation periods exceeding a week is necessary for more adaptive treatment.

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Data availability

Research data are stored in an institutional repository and will be shared upon request to the corresponding author.

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Funding

The authors declare that no funds, grants, or other support was received during the preparation of this manuscript.

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Authors and Affiliations

Authors

Contributions

MK and AA contributed to the study conception and design. Material preparation, data collection, and analysis were performed by MK, RN, and AA. The first draft of the manuscript was written by MK, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Mariko Kawashima.

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Conflict of interest

The authors have no relevant financial or non-financial interests to disclose.

Ethical approval

This study was conducted in accordance with the tenets of the Declaration of Helsinki. Approval was given by the relevant IRB (IRB number 21-24).

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Written informed consent was obtained from all patients included in this study.

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Informed consent was obtained from all patients whose images were included in publication.

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Kawashima, M., Akabane, A., Noda, R. et al. Interfractional change of tumor volume during fractionated stereotactic radiotherapy using gamma knife for brain metastases. J Neurooncol 159, 409–416 (2022). https://doi.org/10.1007/s11060-022-04075-8

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  • DOI: https://doi.org/10.1007/s11060-022-04075-8

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