CXCR4 and neoplasm: Common genes comprised transcripts belonging to the imprinted class, including IGF2, DLK1, PEG3 (in some batches), chromatin related genes, including histone clusters, genes with GpG islands within the transcription start site, such as KNNQ2 and CXCR4, and genes that could play a relevant role in tumor progression and survival such as BCL2.