SCLC	Small-cell lung cancer
ES-SCLC	Extensive-stage small-cell lung cancer
PCI	Prophylactic cerebral irradiation
BM	Brain metastases
APHM	Assistance Publique des Hôpitaux de Marseille
OS	Overall survival
BMFS	Brain metastasis-free survival
PS	Performans status
MLR	Monocyte lymphocyte ratio
HR	Hazard ratio
RPA	Recursive partitioning analysis
MRI	Magnetic resonance imaging
NSCLC	Non-small-cell lung cancer
WBRT	Whole-brain radiotherapy
ECMFS	Extra cerebral metastasis-free survival