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Reduced late urinary toxicity with high-dose intensity-modulated radiotherapy using intra-prostate fiducial markers for localized prostate cancer

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Abstract

Background/purpose

To evaluate the impact of intensity-modulated radiotherapy (IMRT) with intra-prostate fiducial markers image-guided radiotherapy (IGRT) on the incidence of late urinary toxicity compared to 3D conformal radiotherapy (3DCRT) for patients with prostate cancer (PC).

Methods and materials

We selected 733 consecutive patients with localized PC treated with dose-escalation radiotherapy between 2001 and 2014. Eligibility criteria were radiation dose >72.0 Gy, no pelvic RT and minimum follow-up 24 months. 438 patients were treated with 3DCRT and 295 with IMRT. Acute and late urinary complications were assessed using the EORTC/RTOG and CTCAEs v3.0 definition. The Cox regression model was used to compare grade ≥2 urinary toxicity between both techniques. The median follow-up was 75 months (range 24–204).

Results

The median isocenter radiation dose was 78.7 Gy for 3DCRT and 80.7 Gy for IMRT/IGRT (p < 0.001). The 5-year incidence of late grade ≥2 urinary toxicity was 6.4% for IMRT and 10.8% for 3DCRT [hazard ratio (HR) 0.575, p = 0.056]. The corresponding 5-year estimates of late grade ≥2 hematuria were 2% for IMRT and 5.3% for 3DCRT (HR 0.296, p = 0.024). On multivariate analysis, the antecedent of prior transurethral resection of the prostate was also a strong predictor of a higher risk of urinary complications (HR 2.464, p = 0.002) and of hematuria (HR 5.196, p < 0.001).

Conclusion

Compared with 3DCRT, high-dose IMRT/IGRT is associated with a lower rate of late urinary complications in spite of higher radiation dose.

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Authors and Affiliations

  1. Department of Radiation Oncology, Hospital Universitario de La Princesa, Health Research Institute IIS-IP, Diego de León 62, 28006, Madrid, Spain

    A. Zapatero, M. Roch, D. Büchser, P. Castro, L. Fernández-Banda, G. Pozo, O. Liñán, C. Martin de Vidales, A. Cruz-Conde & F. García-Vicente

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  1. A. Zapatero
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  2. M. Roch
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  3. D. Büchser
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  4. P. Castro
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  5. L. Fernández-Banda
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  6. G. Pozo
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  7. O. Liñán
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  8. C. Martin de Vidales
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  9. A. Cruz-Conde
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  10. F. García-Vicente
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All the authors have contributed sufficiently to the scientific work and therefore share collective responsibility and accountability for the results. All the authors have read, approved and consented to submit the manuscript. The manuscript is not under consideration for publication elsewhere.

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Correspondence to A. Zapatero.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Zapatero, A., Roch, M., Büchser, D. et al. Reduced late urinary toxicity with high-dose intensity-modulated radiotherapy using intra-prostate fiducial markers for localized prostate cancer. Clin Transl Oncol 19, 1161–1167 (2017). https://doi.org/10.1007/s12094-017-1655-9

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  • DOI: https://doi.org/10.1007/s12094-017-1655-9

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