The cellular content of p57 was first verified by 1D/WB in two neuroblastoma cell lines, Lan-5 and SH-SY5Y, in the cervical cancer cell line HeLa treated (or not) for 24 h with 100 nM Dexamethasone (Dex), which is known to increase the p57 level, and in non-tumoral cells such as the HTR8/SVneo trophoblast cell line. This evidence concerns the gene CDKN1C and neuroblastoma.