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Predicted probabilities of brain injury after carbon ion radiotherapy for head and neck and skull base tumors in long-term survivors. | LitMetric

AI Article Synopsis

Article Abstract

Background And Purpose: We aimed to determine the risk factors for radiation-induced brain injury (RIBI) after carbon ion radiotherapy (CIRT) to predict their probabilities in long-term survivors.

Materials And Methods: We evaluated 104 patients with head, neck, and skull base tumors who underwent CIRT in a regimen of 32 fractions and were followed up for at least 24 months. RIBI was assessed using the Common Terminology Criteria for Adverse Events.

Results: The median follow-up period was 45.5 months; 19 (18.3 %) patients developed grade ≥2 RIBI. The maximal absolute dose covering 5 mL of the brain (D5ml) was the only significant risk factor for grade ≥2 RIBI in the multivariate logistic regression analysis (p = 0.001). The tolerance doses of D5ml for the 5% and 50% probabilities of developing grade ≥2 RIBI were estimated to be 55.4 Gy (relative biological effectiveness [RBE]) and 68.4 Gy (RBE) by a logistic model, respectively.

Conclusion: D5ml was most significantly associated with grade ≥2 RIBI and may enable the prediction of its probability.

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Source
http://dx.doi.org/10.1016/j.radonc.2021.10.017DOI Listing

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