Is there a link between lymphoma in cats and the use of spot-on flea treatments?
Is there a link between lymphoma in cats and the use of spot-on flea treatments?
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Cats have a higher incidence of lymphoma than dogs or humans. Genetic disposition is perhaps the strongest factor in developing lymphoma, although environmental exposure to carcinogens plays a role as well. While there is no breed or sex predilection for cats that develop the condition, older cats, in the nine to ten years old range, have a higher incidence of it. In the past, the age range was lower largely due to widespread feline leukemia which most often presented as mediastinal lymphoma, that is tumors originating in the chest cavity. While lymphoma was strongly associated with Feline Leukemia Virus, appearing co-morbidly in 70 percent of cases, only 20 percent of affected cats today also have Feline Leukemia. The feline immunodeficiency virus, FIV, increases a cat’s chance of developing lymphoma by sixfold.
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Environmental factors, such as exposure to carcinogens, may also play a role in the development of Leukemia, although there is scant evidence to support this. Some studies show exposure to cigarette smoke may double a cat’s risk of developing lymphoma. A long standing theory linking feline lymphoma to inflammatory disease has yet to be proven or disproven.
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