DRD4 and neoplasm: We identified five candidate genes with higher gene expression associated with amplification in tumor tissues versus normal tissues: Rab GTPase activating protein 1‐like (RABGAP1L), myosin heavy chain 9 (MYH9), dopamine receptor D4 (DRD4), ArfGAP with RhoGAP domain ankyrin repeat and PH domain 2 (ARAP2), and CWF19‐like protein 2 (CWF19L2).