RRM2 and small cell lung carcinoma: We further assessed the expression status of CXCR4, FOXM1, and RRM2 in the SCLC cell line panel (SCLC-NCI, SCLC-UTSW, SCLC CCLE-Broad-MIT, SCLC GDSC-MGH-Sanger, SCLC CTRP-Broad-MIT, and SCLC Global) from the CellMiner-SCLC (https://discover.nci.nih.gov/SclcCellMinerCDB/) and observed a positive correlation in CXCR4, FOXM1, and RRM2 expression (Fig. 5E, supplementary Fig. S11-S13).