Previously, CCS was considered a melanoma of soft parts but was later distinguished from malignant melanoma by the presence of a specific fusion oncogene, EWSR1::ATF1, which is derived from a chromosomal translocation, t(12;22)(q13;q12) (2, 3), and essential for both the development and maintenance of CCS (4, 5). This evidence concerns the gene ATF1 and melanoma.