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Acta Veterinaria Hungarica
Authors: Izabela Janus, Marcin Nowak, Agnieszka Noszczyk-Nowak, Rafał Ciaputa, Małgorzata Kandefer-Gola, Urszula Pasławska, Rafał Sapierzyński, Wojciech Łopuszyński and Iwona Otrocka-Domagała

. ( 2009 ): An immunohistochemical analysis of canine haemangioma and haemangiosarcoma. J. Comp. Pathol. 140 , 158 – 168 . Saydam , O., Senol , O

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growth factor in a haemangiosarcoma patient with a newly typed p53 gene point mutation. Br. J. Dermatol. 143, 11181119. Serum levels of vascular endothelial growth factor in a haemangiosarcoma patient with a newly typed p53 gene

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Avian leukosis virus subgroup J (ALV-J) can cause a variety of neoplasms, including mainly myeloid leukosis (myelocytomatosis) and nephromas. Other tumours, such as histiocytic sarcoma (HS), haemangiosarcoma and mesothelioma, may also develop. In a previous article we described a case in which myeloid leukosis, haemangiomas and leiomyosarcomas appeared simultaneously in a commercial layer flock with infection by ALV-J. The present research was completed to understand the molecular characteristics of the ALV-J strain that induced clinical myeloid leukosis, haemangiomas and leiomyosarcomas. Two strains of ALV-J (SDAU1001 and SDAU1002) were isolated and identified, and their full-length sequences were analysed. The complete genome nucleotide sequences of these two isolates were different in length, 7652 nt and 7636 nt, respectively. They shared 98.9% identity with each other, and 93.4% to 97.8% nucleotide identity to the reference ALV-J isolates. A 19-nucleotide repeat sequence was identified in the primer binding site (PBS) leader region of isolate SDAU1001. A base substitution mutation (base 15 C-T) in this insertion was identified. However, the identical insertion at the same site was not found in SDAU1002. The gag and pol genes of the two viruses were more conserved than the env gene. One key deletion in the E element was a common feature of SDAU1001 and SDAU1002. SDAU1001 and SDAU1002, possibly recombinants of ALV-J and another avian retrovirus, may share the same ancestor. Co-infection by SDAU1001 and SDAU1002 isolates is a possible explanation why myeloid leukosis, haemangiomas, and leiomyosarcomas appeared simultaneously in the same commercial layer flock.

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Mayr, B., Zwetkoff, S., Schaffner, G. and Reifinger, M. 2002b:: Tumour suppressor gene p53 mutation in a case of haemangiosarcoma of a dog. Acta Vet. Hung. 50 , 157-160. Tumour

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haemangiosarcoma in a 3-year-old horse. Australian Vet. J. 67 , 269–270. Williams M. M. Thoracic haemangiosarcoma in a 3-year-old horse Australian Vet. J

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