Barely Significant

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Importantly, patients who underwent surgery after CROSS showed a trend toward improved OS compared with those who did not (44.1 vs. 19.6 months), reaffirming the critical role of surgery in achieving durable outcomes in this complex disease setting.
We further stratified patients who received LRT and found that the survival advantage associated with grade 2 irLI was present in patients with and without LRT ( Supplementary Figure S5A,C ), and the difference was statistically significant in PFS for those with LRT ( Supplementary Figure S5B ) and marginally significant for those without LRT ( Supplementary Figure S5D ).
As reported in the updated MACH-NC meta-analysis, age and Eastern Cooperative Oncology Group (ECOG) Performance Status (PS) appeared as the only significant factors influencing CRT efficacy; in fact elderly patients showed a significant shorter Overall Survival (OS) ( p = 0.03) and a negative trend, although non-significant, in Event-Free Survival (EFS) ( p = 0.06) [ 14 ] if compared with younger patients (<65 years old).