RB1 and leukoencephalopathy with calcifications and cysts: Although the genomic landscape demonstrated robust consistency in SCLC components and LCC components of cSCLC-LCC, both exhibiting neuroendocrine properties, LCC components of SCLC-LCC subtypes displayed two genomic subgroups with specific transcriptional patterns, defined as TP53 and RB1 co-mutation group and TP53 and KEAP1 group.