Supplement Table 1 contains the clinical characteristics. The PD1 gene expression level of patients with advanced lung squamous cell carcinoma is lower than those of early stage patients (Table 4). According to the correlation analysis between PD1/PDL1 gene expression and clinical prognosis (Table 5) and survival analysis (Figure 4), the higher PD1/PDL1 gene expression in patients with early stage lung squamous cell carcinoma had a better prognosis. The gene discussed is PDCD1; the disease is squamous cell lung carcinoma.