ZNF217 and breast cancer: As an example, from the METABRIC study, Figure 6 shows that occurrence of CTCFL amplifications and amplifications of zinc finger transcription factor ZNF217 (another zinc finger transcription factor located in a neighbouring locus at 20q13.2 and proposed to be an oncogene) are only partially overlapping in samples of breast cancer despite both being present in approximately 8% of cases.