SCLC	Small-cell lung cancer
ES-SCLC	Extensive-stage small-cell lung cancer
LS-SCLC	Limited-stage small-cell lung cancer
NSCLC	Non-small cell lung cancer
NCDB	National Cancer Database
PFS	Progression-free survival
OS	Overall survival
CRT	Chemoradiotherapy
Chemo	Chemotherapy
IO	Immunotherapy
ICIs	Immune checkpoint inhibitors
PD-1	Programmed cell death protein 1
PD-L1	Programmed death-ligand 1
ICD	Immunogenic cell death
EP	Etoposide-platinum
PS	Propensity scores
IPTW	Inverse probability of treatment weighting
OW	Overlap weights
ASMD	Absolute standardized mean differences
PH	Proportional hazards
HR	Hazard ratio
CIs	Confidence intervals
KM	Kaplan-Meier
RMST	Restricted mean survival time
SD	Standard deviation