Kaplan–Meier analysis revealed that major pathology response, pathological tumor, node, and metastasis stage post‐NCT (ypTNM), high post‐chemotherapy TIL, high post‐chemotherapy CD8+TIL, low naïve CD4+TIL, low naïve CD4+/CD8+TIL ratio, and increased CD4+TIL levels post‐chemotherapy were favorable prognostic factors in patients with NCT‐NSCLC. Here, CD4 is linked to neoplasm.