Tumour cells of 4 cases of carzinomas of cats were analysed cytogeneti
cally. In 3 cases of adenocarcinomas of different origin there were tr
anslocations (cutaneous sweat gland tumours, salivary glands) and poly
ploidies (in a ceruminal gland tumour), respectively. In the case of a
squamous cell carcinoma of the tongue a deletion was diagnosed.