A competing risk nomogram to predict severe late toxicity after modern re-irradiation for squamous carcinoma of the head and neck Journal Article


Authors: Ward, M. C.; Lee, N. Y.; Caudell, J. J.; Zajichek, A.; Awan, M. J.; Koyfman, S. A.; Dunlap, N. E.; Zakem, S. J.; Hassanzadeh, C.; Marcrom, S.; Boggs, D. H.; Isrow, D.; Vargo, J. A.; Heron, D. E.; Siddiqui, F.; Bonner, J. A.; Beitler, J. J.; Yao, M.; Trotti, A. M.; Riaz, N.; on behalf of the Multi-Institution Re-Irradiation (MIRI) Collaborative
Article Title: A competing risk nomogram to predict severe late toxicity after modern re-irradiation for squamous carcinoma of the head and neck
Abstract: Purpose: Severe late toxicity is common after re-irradiation for recurrent or second primary (RSP) squamous carcinoma of the head and neck. However, many patients experience complications from tumor progression before manifesting late effects. We constructed a nomogram to examine this relationship between late toxicity and competing risks. Methods and materials: Patients with RSP squamous carcinoma originating in a field previously irradiated to ≥40 Gy and treated with IMRT-based re-irradiation to ≥40 Gy were collected. Grade ≥3 late toxicity developing ≥90 days after re-irradiation was collected. A multivariable competing-risk model was fit to the actuarial risk of late toxicity with progression or death as the competing risk. The final bootstrap optimized model was converted into a nomogram. Results: From 9 institutions, 505 patients were included. The 2-year incidence of grade ≥3 late toxicity was 16.7% (95% CI 13.2–20.2%) whereas progression or death was 64.2% (95% CI 59.7–68.8%). The median freedom from late toxicity, progression or death was 10.7, 5.5 and 3.2 months for RPA class I-III patients respectively, whereas the median OS was 44.9, 15.9 and 7.9 months, respectively. The final model included six clinical factors. Notably, dose, volume and fractionation did not significantly impact toxicity. Conclusions: After re-irradiation, the risk of progression or death is approximately four times the risk of radiation-related severe late toxicity. The risk of late toxicity may be more dependent on patient and disease factors than modifiable treatment factors. This model is useful for patient selection, pre-treatment consent and post-treatment survivorship following re-irradiation. © 2019
Keywords: toxicity; salvage; head and neck; recurrent; second primary; reirradiation
Journal Title: Oral Oncology
Volume: 90
ISSN: 1368-8375
Publisher: Elsevier Inc.  
Date Published: 2019-03-01
Start Page: 80
End Page: 86
Language: English
DOI: 10.1016/j.oraloncology.2019.01.022
PROVIDER: scopus
PUBMED: 30846182
DOI/URL:
Notes: Source: Scopus
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  1. Nadeem Riaz
    421 Riaz
  2. Nancy Y. Lee
    884 Lee