In summary, amplifications of EVX2, HOXD13, HOXD12, HOXD11, HOXD10, and HOXD9 on 2q31.1, NDUFV1 on 11q13.2, and RPL10, SNORA70, DNASE1L1, TAZ, ATP6AP1, and GDI1 on Xq28 were found in all nine mature cystic teratomas in this study. This evidence concerns the gene HOXD9 and cystic teratoma.