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Histologic characteristics as prognostic indicators for feline osteosarcomas
A very interesting study has recently been performed in Dennmark to investigate the histologic characteristics of feline osteosarcoma (OS) and compare the histologic data with phenotypically comparable canine OS. The effects of histologic and clinical variables on survival statistics were evaluated on 62 cats and 22 dogs. The results are not really surprising...

Medical records of 62 cats with OS were reviewed for clinically relevant data. Clinical outcome was obtained by telephone interview.

Histologic characteristics of OS were classified using a standardized grading system.

Histologic characteristics in 22 feline skeletal OS were compared with 22 canine skeletal OS of identical location and subtype.

Prognostic variables for clinical outcome were determined using multivariate analysis.

RESULTS: Feline OS was characterized by moderate to abundant cellular pleomorphism, low mitotic index, small to moderate amounts of matrix, high cellularity, and a moderate amount of necrosis.

There was no significant difference between histologic variables in feline and canine OS. Histologic grade, surgery, and mitotic index significantly influenced clinical outcome as determined by multivariate analysis.

Tumor invasion into vessels was not identified as a significant prognosticator.

Based on these results, feline and canine skeletal OS have similar histologic but different prognostic characteristics. Prognosis for cats with OS is related to histologic grade and mitotic index of the tumor.

Source: Dimopoulou M, Kirpensteijn J, Moens H, Kik M. (2008): Histologic prognosticators in feline osteosarcoma: a comparison with phenotypically similar canine osteosarcoma. In: Vet Surg. 2008 Jul;37(5):466-71.



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SMALL ANIMAL PRACTICE

3 Serological Tests for Early Detection Of Leptospira-specific Antibodies
Leptospirosis in dogs is a disease of global importance. Early detection and appropriate therapeutic intervention are necessary to resolve infection and prevent zoonotic transmission. However, its diagnosis is hindered by nonspecific clinical signs and lack of rapid diagnostic tests of early infection. Recently, 2 rapid point-of-care tests (WITNESS Lepto [WITNESS Lepto, Zoetis LLC, Kalamazoo, MI, USA] and SNAP Lepto [SNAP Lepto, IDEXX Laboratories, Westbrook, ME, USA]) for detection of Leptospira-specific antibodies in canine sera were developed. This recently online published article compares three systems for early diagnosis.

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