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Adjusted hazard ratios (HRs) for overall survival stratified by risk group and locoregional radiotherapy (LRRT) (A) or metastasis radiotherapy (MRT) (B) in patients with bone-only metastatic nasopharyngeal carcinoma. The low-risk group not combined with LRRT/MRT was the reference group (HR, 1). The adjusted variables were age, sex, T category, N category, and pre-treatment Epstein-Barr virus DNA.
