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  • Author or Editor: Orla M. Mahony x
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To evaluate response to chemotherapy in cats with alimentary lymphoma and to determine factors associated with survival time.


Retrospective case series.


28 cats with alimentary lymphoma that underwent chemotherapy.


In all cats, the diagnosis had been established by means of cytologic or histologic examination of ultrasound-guided aspirates and biopsy specimens (18 cats), histologic examination of surgically obtained biopsy specimens (7 cats), or examination of specimens obtained endoscopically (3 cats). Clinical signs included anorexia, weight loss, vomiting, and diarrhea. Twenty-seven cats were treated with vincristine sulfate, cyclophosphamide, and prednisone; 1 was treated with chlorambucil and prednisone. Survival time ranged from 2 to 2,120 days (median, 50 days). Nine cats achieved complete remission (remission time ranged from 30 to 1,700 days; median, 213 days), 2 achieved partial remission, and 17 failed to respond to chemotherapy. Sex, FeLV status, hematocrit, serum total protein concentration, site and extent of gastrointestinal involvement, and clinical stage were not found to be associated with survival time.

Clinical Implications

Cats with alimentary lymphoma are poorly responsive to treatment with vincristine, cyclophosphamide, and prednisone; however, a small subset of cats may have long survival times.

Free access
in Journal of the American Veterinary Medical Association


Objective—To compare effects of short-term administration of a soy diet with those of a soy-free diet on serum thyroid hormone concentrations in healthy adult cats.

Animals—18 healthy adult cats.

Procedure—Cats were randomly assigned to receive either a soy or soy-free diet for 3 months each in a crossover design. Assays included CBC, serum biochemical profile, thyroid hormone analysis, and measurement of urinary isoflavone concentrations.

Results—Genistein, a major soy isoflavone, was identified in the urine of 10 of 18 cats prior to dietary intervention. Compared with the soy-free diet, cats that received the soy diet had significantly higher total thyroxine (T4) and free T4 (fT4) concentrations, but unchanged total triiodothyronine (T3) concentrations. The T3/fT4 ratio was also significantly lower in cats that received the soy diet. Although the magnitudes of the increases were small (8% for T4 and 14% for fT4), these changes resulted in an increased proportion of cats (from 1/18 to 4/18) that had fT4 values greater than the upper limit of the laboratory reference range. There was no significant effect of diet on any other measured parameter.

Conclusions and Clinical Relevance—Short-term administration of dietary soy has a measurable although modest effect on thyroid hormone homeostasis in cats. Increase in T4 concentration relative to T3 concentration may result from inhibition of 5'-iodothyronine deiodinase or enhanced T3 clearance. Soy is a common dietary component that increases serum T4 concentration in cats. ( Am J Vet Res 2004; 65:586–591)

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in American Journal of Veterinary Research