Evaluation of canine and feline tumors in Morocco: Results of a prospective observational study of 250 cases (2020-2023).

Abstract

This work aimed to evaluate the histologic tumor types and patient characteristics of canine and feline neoplasias in Morocco. In a prospective, observational study, 250 tumor samples were collected from veterinary clinics in Morocco. For each case, breed, age, sex, neuter status, and tumor site and histotype were analyzed. Among the 250 tumors, 201 (80.4%) were from dogs and 49 (19.6%) from cats. Most common tumor location in dogs was the reproductive tract (36.8%), followed by skin and soft tissues (27.4%) and mammary gland (14.9%). In cats, most tumors originated from the skin and soft tissues (55.1%), followed by mammary gland (20.4%) and oral cavity (14.3%). Commonest canine histologic tumor types were transmissible venereal tumor (CTVT11Abbreviations: CTVT, Canine transmissible venereal tumor; PAS, Periodic Acid-Schiff; IHC, Immunohistochemistry; AR, Antigen Retrieval; n, number; SD, Standard deviation; WHO, World Health Organization; Vet ICD-O, The Veterinary International Classification of Diseases for Oncology Canine Tumors First Edition; SCC, Squamous cell carcinoma.) (31.8%) and mammary carcinoma (14.4%). Squamous cell carcinoma (34.7%) and mammary carcinoma (20.4%) represented the most frequent feline neoplasms. Median age of dogs and cats at diagnosis was 7 and 10 years, respectively. Gender distribution was even in dogs; in cats, females were overrepresented. Most cats and about half of dogs were mixed-breed. The evaluated canine and feline neoplasias show differences in their tumor types and patient characteristics when compared to populations from other countries, in part based on the high number of CTVT and - possibly solar-induced –feline skin tumors.