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Answered by
Dr Dave Brooks, BVetMed BSc MRCVS
Hi,
Feline injection site sarcomas are cancerous tumors that form in a site where an injection has been performed. These tumors are most commonly associated with vaccinations.
While many think the adjuvants (added to the vaccine to increase the effectiveness of the vaccine) are to blame recent studies show that in some cats inflammation is caused purely through the process of instilling a substance into the skin. It is suspected that the inflammation is not controlled in some cats and then potentially transforms into a sarcoma.
For most cats, vaccination is a low risk with reports indicating occurrence at 1 case per 10,000 - 30,000 vaccinations.
These sarcomas are aggressive invading into local tissue which then potentially metastasize to other areas in the body. With metastasis, patients have a poor prognosis.
| 02.26.16 @ 21:42
Feline injection site sarcomas are cancerous tumors that form in a site where an injection has been performed. These tumors are most commonly associated with vaccinations.
While many think the adjuvants (added to the vaccine to increase the effectiveness of the vaccine) are to blame recent studies show that in some cats inflammation is caused purely through the process of instilling a substance into the skin. It is suspected that the inflammation is not controlled in some cats and then potentially transforms into a sarcoma.
For most cats, vaccination is a low risk with reports indicating occurrence at 1 case per 10,000 - 30,000 vaccinations.
These sarcomas are aggressive invading into local tissue which then potentially metastasize to other areas in the body. With metastasis, patients have a poor prognosis.
| 02.26.16 @ 21:42
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$commenter.renderDisplayableName() — {comment} | 01.17.20 @ 20:05
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