PDCD1 and small cell lung carcinoma: We used forest plots to show the ROR values and 95% confidence intervals for the occurrence of SCLC-irAEs under different ICIs + Chemo regimens (Figure 4A), such as PD1_Chemo, PDL1_Chemo, CTLA4_Chemo, PD1-CTLA4_Chemo and PDL1-CTLA4_Chemo.