It was later found that the NudCD1 gene encodes for three different isoforms that share a common C-terminus (Fig. 1A), and that isoforms 1 and 2 had differential expression resulting from transcriptional regulation: isoform 1 was predominantly expressed in testis and overexpressed in tumor cell lines while isoform 2 was weakly expressed in tumor cell lines27. This evidence concerns the gene NUDCD1 and neoplasm.