Cytogenetic studies in a canine malignant melanoma.

In a 13-year-old, male rough-haired Dachshund with a malignant melanoma, cytogenetic evaluation of tumour cells showed hyperdiploidy (79 to 81 chromosomes) in 50 per cent of the metaphases. Several bi-armed chromosomes (centric fusions, one isochromosome and two unidentified markers) were observed.

Characterisation of complex karyotype changes in two canine bone tumours.

Two dogs developed osteosarcomas. In both cases, the cytogenetic analysis revealed the presence of numerically and structurally altered karyotypes. The chromosome ranges were 90 to 99 and 65 to 67, respectively.

Near triploidy in a feline fibrosarcoma.

A seven-year-old male cat developed a subcutaneous fibrosarcoma. The numerical cytogenetic evaluation of the tumour revealed the presence of 69.2% of cells in the near-triploid chromosome range between 51 and 64.