B2M and small cell lung carcinoma: Kim et al. (2023) identified several markers overexpressed in the heterogenous non-NE SCLC subtype, including IFITM3 (interferon-induced transmembrane protein 3), B2M (beta-2-microglobulin), ANXA4 (annexin A4), VIM (vimentin), CD74, S100A11 (S100 calcium binding protein A11), and YAP1 [18].