CD4+ and CD8+ T cells were abundant in SCLC-I, as were CD4+/FOXP3, CD8+/PD-L1, and CD20 (p < 0.06; S18-26664; Kruskal–Wallis H test, p < 0.004; Figure 3F and Figure S3). Here, CD8A is linked to small cell lung carcinoma.