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Vaccine Associated Sarcoma - Fibrosarcoma, Osteosarcoma, Chondrosarcoma | Three Legged Cats


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Vaccine Associated Sarcoma - Fibrosarcoma, Osteosarcoma, Chondrosarcoma
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15 April 2017 - 11:36 am
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Although studies show 80% of vaccine associated sarcomas (VAS) are classified as fibrosarcoma, the remaining 20% are classified as osteosarcoma, chondrosarcoma, or other high-grade stromal sarcomas. Here is a fairly easy-to-read journal article on Feline Postvaccinal Sarcoma:

I suggest that anyone who has any of these sarcomas diagnosed discuss the possibility of it being caused by a vaccine with their vet. Ask for the vaccine records for the vet to pursue reimbursement for treatment from the pharmaceutical company.

Please remember yearly vaccines (unless regulated by law for rabies) are not necessary, generally every 3 years is now considered sufficient. Discuss your cat's life-style and risk with your vet. Do not allow vets to vaccinate anywhere but in the leg: 


Kerren and VAS Tripawd Survivor Mona


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15 April 2017 - 12:09 pm
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Thank you dear Kerren and Mona!! Your contributions are sooo valuable and really do save lives!!! 🙂 Pretty special legacy you and Miss Mona have given us all! 🙂


Sally and Alumni Happy Hannah and Merry Myrtle and Frankie too!

Happy Hannah had a glorious additional bonus time of over one yr & two months after amp for osteo! She made me laugh everyday! Joined April's Angels after send off meal of steak, ice cream, M&Ms & deer poop!


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15 April 2017 - 5:16 pm
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Thanks Kerren!!
Great info!
We did Titers before Purrkins got cancer. Now we do not Titer or vaccinate.
The fact that we have to be cautious of where we vaccinate is horrifying!
We vaccinate in those areas just so we can cut them off and that is still no guarantee.

Mona is our very special VAS advocate & survivor !superstar

Just wanted to add some links to yours. I do think we are over vaccinating our cats,

Vaccines for Cats: We Need to Stop Overvaccinating

Titer Testing In Cats

The Rainbow Bridge

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15 April 2017 - 7:53 pm
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SUPER DUPER information, thank you so much Kerren! This is really valuable for folks.

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15 April 2017 - 8:29 pm
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You're welcome everyone. I became aware recently that injections can cause osteosarcoma in cats so thought I should share the information.

Holly, thanks for including those links. smiley

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16 April 2017 - 3:00 pm
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Wow, I did not know you could submit receipts to the pharmaceutical company for reimbursement?  Please tell me more!  Our other cat, Junior, is almost 16.  Last summer he had a tumor removed that turned out to be malignant and it was directly from his rabies injection.  I had NO idea I could request reimbursement?  Is it too late to do so?

Junior is still plugging along.  15 1/2 years old, is in Stage 3 renal failure and has cancer.  The cancer, thank goodness, has not come back which was our biggest fear.


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16 April 2017 - 4:06 pm
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I am sorry to hear about Junior !
I do not see anything on time frame? Kerren might know.
I would surely call and find out!
The number is below.

  1. Report all histologically confirmed VAFSs to the manufacturer and to U.S. Pharmacopoeia Veterinary Practitioners' Reporting Program. To make a report or request reporting forms, call 800-4-USP-PRN (800-487-7776) or visit the USP Web site at

Screen-Shot-2017-04-16-at-5.16.47-PM.pngImage Enlarger

I am including website links

Vaccine-associated feline sarcomas


Vaccine-Associated Feline Sarcoma Task Force Guidelines - Diagnosis and Management of Suspected Sarcomas

Let us know what you find out please.

Chin & ear scratches to Bob & Junior

Holly & Purrkinsheart


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16 April 2017 - 5:18 pm
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I don't think there is no timeline for reimbursement and please note that it is not guaranteed. It depends on the pharmaceutical company. It's really important that the vet send the information and request to the pharmaceutical company because the vet is the "customer". I didn't know about this at all until my vet clinic phoned me and said they had a cheque from the pharmaceutical company for 50% of my costs. Others have been reimbursed less and others more. Some were successful without the support of their vet but it was a lot of work and hounding the pharma company.

Along with the details of the vaccine type, etc, you may need a copy of the histology report on the lump.

Thanks to Holly for the websites. It's unlikely that you'll find information on the reimbursements because the pharma companies want you to sign something stating the payment is not admission of responsibility on their part but is "intended solely as voluntary support in appreciation of your clientele" (meaning the vet's clientele because the letter is addressed to the vet). I didn't sign the form, just cashed the cheque.

I hope you and Junior are successful.


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16 April 2017 - 7:45 pm
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I will have to remember the vaccine sites .. thanks!  My cats all had their shots as kittens, but honestly, not since then.  I sometimes feel like a bad cat-mom, but we lost Midnight to what was more than likely a vaccine-related sarcoma, and I just don't like the chances.  Our cats are always indoor-only and not exposed to anything, especially since the dogs are on flea & tick preventative.  When Midnight had first developed the lump, I took him into the vet, but it was at a time when our regular vet was in the process of retiring and a different guy was there.  He did aspirate, but only got "inflammation," so I didn't know what I didn't know ... that it's not uncommon to not get into the tumor annoying that I didn't pursue it more.  When the tumor got larger and started getting painful, I took him in and that time saw our regular vet, who told me that he could have removed it when it was smaller.  ugh ... I wasn't offered amputation, maybe he didn't realize it was an option, and Midnight was about 16.


Donna, Glenn & Murphy

Murphy had his right front leg amputated due to histiocytic sarcoma at 7 years old.  He survived 4 years, 2 months & 1 week, only to be taken by hemangiosarcoma at 11 1/2 years 6/12/17  


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