nominally significantp = 0.039
Subgroup analysis showed that patients with cN2‐3 had a significant survival benefit with NAC‐DCF (HR 0.51; 95% CI, 0.34–0.76) in the IPW analysis, whereas no clear association was observed in those with cN0–1 (HR 0.93; 95% CI, 0.62–1.34), with a nominally significant interaction by clinical N stage ( p = 0.039).