A reciprocal t(1;15)(p36.1-36.3;q25-26) has been identified in an established neuroblastoma cell line (NGP) that earlier studies had shown to carry, among others, a rearrangement at the 1p subtelomeric region. Though it has not been possible to establish whether this translocation was constitutional, it is of interest to note that one of the breakpoints is located within the well-known 1p consensus site of tumor-associated chromosomal rearrangements where, as a result of the reciprocal translocation, the FES oncogene has been transferred from autosome 15. It is to be expected that the molecular cloning of the 1p and 15q translocation breakpoints may yield crucial data for understanding the association between specific chromosomal rearrangements and malignant tumor progression.