Breast Cancer is the third largest killer of felines.

Not too long ago, when a cat owner learned that a pet had cancer, it meant a death sentence for the animal. Thanks to advances in feline cancer research things have changed - cat HAS chance to survive. But only if its owner knows how to prevent this disease and how to recognize first symptoms of it. That's why I decidet to post this news article.

What is Feline Breast Cancer?

Cancer - in general - is an uncontrolled growth of cells on or within the body. It may be localized, or it may invade adjacent tissue and spread throughout the body. Cancer is common in pet animals, and the rate increases with age. Dogs get cancer at roughly the same rate as humans, while cats get fewer cancers. Cancer accounts for almost half of the deaths of pets over 10 years of age.

Mammary cancer occurs much less frequently in cats than dogs, but when it does occur, it is often malignant and difficult to treat. Mammary cancer is likely to strike 1 in 4,000 cats. While this is about half the rate as in dogs, when cats develop mammary cancer it is often fatal. There is a strong correlation between early spaying and a reduced incidence of the disease. If mammary cancer is caught early, the treatment is more often successful.

Unfortunately, the cause of most cancers is not known and therefore prevention is difficult. One known cause of cancer is an injection, most often a vaccination, which may spur an overzealous inflammatory or immune system reaction to the vaccine. This is called an injection-site sarcoma. Other cancer, such as breast cancer, is largely preventable with early spaying.

Which cats are at risk for developing mammary cancer?

Any adult female cat can develop mammary cancer, but the average age is usually 10-14 years of age. Siamese cats appear to have a genetic predisposition for developing mammary cancer and are twice as likely to develop it as other breeds. Unspayed females are at a much greater risk of developing mammary cancer. Female cats that were spayed after having one to several heat cycles, with or without having kittens, are also at a greater risk than a cat that was spayed before her first heat cycle.

What are the types of mammary cancer in cats?

Studies reveal that 85% of mammary tumors in cats are malignant adenocarcinomas. The tumors that make up the other 15% include duct papillomas, sarcomas, and adenomas. Adenocarcinomas are very aggressive tumors and often metastasize to the surrounding lymph nodes and lungs.

What are the symptoms of mammary tumors in cats?

Mammary tumors in cats often appear as firm nodules that are moveable or firmly attached to the skin and/or underlying muscle. About one fourth of the tumors are ulcerated. The tumors are more common on the first front sets of mammary glands. In half of the cases, tumors are present in more than one gland. Swelling, pain, infection, and fever may also be present.

What is the treatment?

Treatment usually consists of surgical removal of the tumor and the surrounding mammary gland. Some surgeons recommend complete removal of the entire mammary gland chain. These tumors are extremely aggressive and because of the high incidence of metastasis with adenocarcinomas, an aggressive treatment approach is necessary. Proper identification of the removed tumor is always recommended to help determine if further treatments are necessary. Chemotherapy is often used in combination with surgical removal to increase survivability rates. Mitoxantrone, cytoxan, and adriamycin are often used as chemotherapy agents in treating this tumor type. Because of the technical expertise needed to properly administer the newest and most effective chemotherapy drugs, a consultation with a boarded veterinary oncologist is recommended.

What is the prognosis for cats with mammary cancer?

While the initial treatment for cats with mammary cancer may be successful, the long-term outcome is usually guarded. Up to 65% of surgically removed tumors will reoccur within a year. Unfortunately, most cats survive less than a year after initial diagnosis. However, cats who receive aggressive treatment on small tumors that are caught early may live 2 to 3 years.

How is mammary cancer prevented?

While mammary cancer in cats is not completely preventable, there are several precautions owners can take to decrease the incidence of this disease. The first is to make sure their cats are spayed before they come into their first heat. There is a strong correlation between early spaying and a reduction in the incidence of mammary tumors in cats.

The second precaution is to avoid the use of progesterone-like drugs such as Ovaban and Depo-Provera, which can increase the incidence of mammary cancer in cats. These drugs are still occasionally used to treat miliary dermatitis and some behavior disorders in cats. Owners of female cats need to weigh the risk versus the potential benefits of using these drugs in their cats.

Finally, owners should be sure their cats get regular, thorough veterinary checkups. Owners can perform their own mini checkups by feeling for any lumps or bumps, particularly in the mammary area. Early detection and treatment is very important in the successful treatment and outcome of mammary cancer in cats.

Signs of Feline Cancer:

1. Any lump or mass that appears to be increasing in size

2. Any sore that does not heal

3. Change in bowel or bladder habits

4. Difficulty urinating or defecating

5. Unexplained bleeding or discharge from any body opening

6. Loss of appetite

7. Weight loss

8. Difficulty breathing

9. Persistent lameness or stiffness

10. Offensive odor

11. Difficulty eating or swallowing