Preliminary exploration of the optimal timing of chemoimmunotherapy combined with radiotherapy for oligometastatic esophageal squamous cell carcinoma and analysis of prognostic factors: a multicenter retrospective study.

Although a strong trend toward improved survival was also observed for the Concurrent group compared to the RT-first group (aHR = 0.58; 95% CI, 0.37–0.92; P’ = 0.022), this difference did not meet the significance threshold after Bonferroni correction ( Table 3 ).

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