Impact of Antibiotic Use in the Primary Treatment of Nasopharyngeal Carcinoma

Background: Antibiotics are commonly prescribed to patients with nasopharyngeal carcinoma (NPC) during chemoradiotherapy; however, peri-treatment antibiotic use may adversely affect patients’ outcomes. Methods: A retrospective cohort study was conducted. The association between antibiotic use and patients’ survival time was analyzed using Kaplan–Meier and Cox proportional hazards regression models. Results: Among 455 NPC patients, 42.0% received antibiotics around primary treatment. Patients who had an advanced tumor stage (p = 0.019) or had received neoadjuvant chemotherapy (p = 0.008) or concurrent chemoradiotherapy (p = 0.002) were more likely to be prescribed antibiotics. Univariate analysis showed that antibiotic use around primary treatment was associated with worse disease-specific survival (DSS) at both 5 years (p = 0.043) and 10 years (p = 0.019). Subgroup analysis showed that 5-year and 10-year DSS were significantly shortened in patients receiving RT only and Abx within 2 w or 1 w around RT (5-year: 2 w p = 0.001, 1 w p < 0.001; 10-year 2 w p < 0.001, 1 w p = 0.005). Conclusions: In NPC, antibiotic use around primary treatment was associated with poorer disease-specific survival. Further prospective studies are warranted to clarify the causality and underlying mechanisms.