Background: The influence of COVID-19 vaccination before chemoradiotherapy on nonmetastatic nasopharyngeal carcinoma (NPC) is not known.
Methods: Propensity score matching was used to minimize potential selection bias between groups. Primary endpoints were treatment-related adverse events (TRAEs). The Kaplan-Meier method and Cox proportional hazards models were performed to conduct survival analysis. The Benjamini-Hochberg false discovery rate control procedure was used to adjust for multiple comparisons.
Results: Eight hundred ninety-three patients with newly diagnosed nonmetastatic NPC were enrolled. On propensity score matching analysis, the vaccinated group exhibited a higher prevalence of neutropenia (p = 0.045) and fatigue (p = 0.010) during induction chemotherapy and a higher prevalence of fatigue (p = 0.015) during radiotherapy after adjustment for multiple comparisons. No significant differences were observed in 2-year OS, PFS, DMFS, and LRRFS in matched groups. Additionally, vaccinated patients exhibited a high and comparable absolute lymphocyte count.
Conclusions: COVID-19 vaccination before chemoradiotherapy increases the prevalence of acute TRAEs, while no significant influence is observed on the oncologic outcomes of patients with nonmetastatic NPC.
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