title: Perforin expression in feline epitheliotropic cutaneous lymphoma.
abstract: Cutaneous lymphomas are uncommon in people and companion animals. The tumors can be broadly categorized into epitheliotropic and nonepitheliotropic forms, which appear to have different biological behaviors. The present case describes a feline cutaneous epitheliotropic lymphoma. Masses in a 9-year-old cat were first identified on the tail. The cat was treated with chemotherapy, but additional skin masses developed on the flank, face, and ears. Local radiation induced transient tumor regression, but eventual dissemination prompted euthanasia 13 months after initial tumor appearance. Granular lymphocytes were consistently detected on blood smears, and histologically, the tumor involved the skin and superficial subcutis. Tumor lymphocytes expressed cluster of differentiation 3 (CD3) and perforin molecules, suggestive of a cytotoxic phenotype. Location, histopathological features, and perforin expression were similar to a distinct entity in human medicine designated primary cutaneous, CD8-positive, epidermotropic, cytotoxic, T-cell lymphoma.
authors.affiliation: Department of Pathobiology, University of Guelph, Guelph, Ontario, Canada.
authors.forename: Michal
authors.initials: M
authors.lastname: Neta
authors.forename: Dinaz
authors.initials: D
authors.lastname: Naigamwalla
authors.forename: Dorothee
authors.initials: D
authors.lastname: Bienzle
mesh_terms: D000818:Animals; D002371:Cat Diseases / Q000473:pathology*; D002415:Cats; D008113:Liver Neoplasms / Q000473:pathology / Q000662:veterinary; D008214:Lymphocytes / Q000473:pathology; D016410:Lymphoma, T-Cell, Cutaneous / Q000473:pathology / Q000662:veterinary*; D008297:Male; D054353:Perforin / Q000235:genetics*; D012867:Skin / Q000473:pathology; D012878:Skin Neoplasms / Q000473:pathology / Q000662:veterinary*; D013245:Sterilization, Reproductive / Q000662:veterinary
chemical_list: D054353:Perforin