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. 2021 Feb 25;26(1):86-92.
doi: 10.5603/RPOR.a2021.0015. eCollection 2021.

A radiobiological comparison of hypo-fractionation versus conventional fractionation for breast cancer 3D-conformal radiation therapy

Arezoo Kazemzadeh  1 , Iraj Abedi  2 , Alireza Amouheidari  3 , Atefeh Shirvany  4
Affiliations

A radiobiological comparison of hypo-fractionation versus conventional fractionation for breast cancer 3D-conformal radiation therapy

Arezoo Kazemzadeh et al. Rep Pract Oncol Radiother. .

Abstract

Background: The present research was aimed to compare the toxicity and effectiveness of conventional fractionated radiotherapy versus hypo-fractionated radiotherapy in breast cancer utilizing a radiobiological model.

Materials and methods: Thirty-five left-sided breast cancer patients without involvement of the supraclavicular and axillary lymph nodes (with the nodal stage of N0) that had been treated with conventional or hypo-fractionated were incorporated in this study. A radiobiological model was performed to foretell normal tissue complication probability (NTCP) and tumor control probability (TCP).

Results: The data represented that TCP values for conventional and hypo-fractionated regimens were 99.16 ± 0.09 and 95.96 ± 0.48, respectively (p = 0.00). Moreover, the NTCP values of the lung for conventional and hypo-fractionated treatment were 0.024 versus 0.13 (p = 0.035), respectively. Also, NTCP values of the heart were equal to zero for both regimens.

Conclusion: In summary, hypo-fractionated regimens had comparable efficacy to conventional fraction radiation therapy in the case of dosimetry parameters for patients who had left breast cancer. But, utilizing the radiobiological model, conventional fractionated regimens presented better results compared to hypo-fractionated regimens.

Keywords: 3D-conformal radiation therapy; breast cancer; conventional fractionation; hypo-fractionation; radiobiological model.

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Conflict of interest statement

Conflict of interest The authors of this article have no conflicts of interest to report.

Figures

Figure 1
Figure 1
Dose-volume histograms for: A. Hypo-fraction and, B. Conventional fraction in left breast cancer radiotherapy
See this image and copyright information in PMC

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