Figure 3

DNA copy number changes in a representative chordoma. Genomic profile of case 8 analysed using 32k array comparative genomic hybridisation (aCGH; top left). Tumour/reference log 2 ratios are displayed as the moving average of three consecutive bacterial artificial chromosome (BAC) clones, and individual chromosomes are separated by vertical bars. The profile demonstrates multiple imbalances, e.g., loss of chromosome 13 and homozygous deletion of CDKN2A (p16) on chromosome 9 (bottom left). Fluorescence in situ hybridisation (FISH) analysis of the same case displays loss of chromosome 13 (blue) and homozygous deletion of CDKN2A (p16) (top right). For comparison, a normal cell shows two chromosomes 13 and two normal chromosomes 9, with centromere of chromosome 9 (cep 9) and LSI p16 indicated in green and red, respectively (bottom right) (See online version for colour figure.).