Online supplemental figure S7A, B summarized the relationship between all immune cell proportions in two SCLC groups, while the correlation with each other was fairly modest. Then, we explored the significant differences of activated memory CD4 T cells between high-risk and low-risk group when the expression level of three prognostic biomarkers were all taken into account (p=0.048, online supplemental figure S7C). The gene discussed is CD4; the disease is small cell lung carcinoma.