A study group of Prof. Fernando Ferreira (photo, along with the first author, Maria João Soares), from the Center for Interdisciplinary Research in Animal Health (Faculty of Veterinary Medicine, Technical University of Lisbon), identified the overexpression of the HER2 proto-oncogene in a significant number of mammary carcinomas in cat. This work goes to show the importance of these tumors in comparative oncology studies and was published in The Journal of Microscopy and Microanalysis (American Association of Microscopy).