NR4A1 and neoplasm: Through analyzing the transcriptome data in GEPIA2, GEO (GSE7803, GSE7410 and GSE39001), GENT2 and TIMER2.0 databases, we found that NR4A1 mRNA expression was lower in CC tissues than in non-tumor tissues (Fig. 3A; Additional file 1: Fig.S3A–C).