For example, one of those studies merged four GEO datasets (GSE60052, GSE43346, GSE15240, and GSE6044) and identified 20 SCLC-related genes (S1PR1, MAD2L1, CDKN2A, STIL, NDC80, NCAPG, PAD51AP1, TTK, PRM2, EZH2, PRC1, UBE2C, RFC4, CENPF, TCP2A, HMGB3, TYMS, SOX4, MCM2, and SMC4) [10]. Here, MCM2 is linked to small cell lung carcinoma.