How common are injection-site sarcomas in cats?

Injection-site sarcomas are considered to be a rare development. Reports indicate that they occur at a rate of about 1 case per 10,000 to 30,000 vaccinations.

What tumor type is a cat predisposed to developing at vaccination sites?

In cats, the most serious of these adverse consequences is the occurrence of invasive sarcomas (mostly fibrosarcomas), so called “feline injection-site sarcomas” (FISS), that can develop within the skin at sites of previous vaccination (Fig. 1 and 2).

Can cats get a lump after an injection?

Cats will commonly develop a lump at the site of a vaccination, typically caused by inflammation and local immune stimulation. These lumps are typically benign and will resolve spontaneously a few weeks after they are noticed.

How fast do injection-site sarcomas grow?

The main symptom of an injection-site sarcoma is a tumor, or mass, around the location of the injection. But, it’s important to note the tumor can form long after the injection took place. Most tumors form within a few weeks, but they can form up to 10 years after the initial injection.

Can cats survive injection site sarcoma?

Feline injection-site sarcoma arises from connective tissues. The most common injection-site sarcoma in cats is a fibrosarcoma….Navigating through my options:

Treatment	Prognosis- (median)/ Duration of tumor control	Treatment Schedule
Electrochemotherapy	6 months	1-3 treatments every other week post- operatively

Can cats survive sarcoma?

The median survival was 308 days for cats with a PCV<25\%, and 760 days for cats with a PCV > or = 25\% (P = 0.017). Radiation therapy in combination with surgery results in relatively long-term survival in cats with soft tissue sarcomas.

How long can a cat live with soft tissue sarcoma?

The average survival time is 6-12 months following the appropriate therapy. Palliative therapy can be used in lieu of aggressive/curative-intent treatment options in cases where the tumor is not considered to be operable.

How long do cats live with sarcoma?

How can you tell if a lump on a cat is cancerous?

Symptoms of cancer include lumps that change in shape or size, sores that do not heal, a rough coat, lethargy, changes in bowel or bladder habits, and difficulty swallowing. Your kitty may find it difficult to urinate or defecate or may have unexplained bleeding or discharge.

How long can a cat live with an injection site sarcoma?

In general, these are difficult tumors to treat and cure is rare. Surgery alone can offer an overall survival of 12-16 months and the longest prognosis is given when an aggressive first surgery is done by a board-certified veterinary surgeon.

How long can a cat live with a sarcoma?

Where do they inject vaccines in cats?

The injections are given in the subcutaneous tissue (sub = under, cutaneous = skin), which is considerably looser in the cat than in the human. Start by pinching some loose skin along the back of your cat between your thumb and forefinger.