MYCN and neuroblastoma: Common chromosomal abnormalities include partial deletion of the short arm of chromosome 1 (1p deletion) in 30–35% of NB tumors, additional genetic material from the long arm of chromosome 17 (17q gain) in more than 50%, amplification of the proto-oncogene MYCN (25–30%) and deletion of chromosome 11q and 14q [1-7].