(b) p-value, probability-value; Omnibus Chi-square p-value < 0.001; Hosmer-Lemeshow goodness-of-fit p-value = 0.68; 83.3% overall correct classification rate; (c) PD-1, programmed cell death-1; (d) COPD, chronic obstructive pulmonary disease; (e) ECOG, Eastern Cooperative Oncology Group. The gene discussed is PDCD1; the disease is chronic obstructive pulmonary disease.