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Risk of Second Primary Malignancies After External Beam Radiotherapy for Thyroid Cancer. Anticancer research Jin, M. C., Qian, Z. J., Megwalu, U. C. 2022; 42 (3): 1359-1365

Abstract

AIM: To investigate the association between external beam radiotherapy (EBRT) and the incidence of second primary tumors in patients with thyroid cancer.MATERIALS AND METHODS: Data were extracted from the Surveillance, Epidemiology, and End Results 9 database. The study cohort included patients diagnosed with thyroid cancer between 1973 and 2017. Risk factors for second primary malignancies were identified with Cox proportional hazards models. Propensity score-matched analyses were used to assess the association between EBRT and second primary malignancies.RESULTS: Out of 72,392 patients with thyroid cancer, 7,684 (10.6%) developed a subsequent primary malignancy. Propensity score-matched analysis demonstrated patients receiving EBRT were more likely to develop second primary malignancies [30-year cumulative incidence=35.3% (95% confidence interval (CI)=30.4-39.8% vs. 28.1% (95% CI=27.0-29.2%); hazard ratio=1.17 (95% CI=1.03-1.33)].CONCLUSION: In patients with thyroid cancer, EBRT is associated with an increased incidence of second primary malignancies.

View details for DOI 10.21873/anticanres.15605

View details for PubMedID 35220228