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CONTRIBUTOR(S): Vetstream Ltd, Isabelle Desmas-Bazelle, Fear Free,

Cancer in your cat – possible options

Cancer in your cat – possible options

Cancer is the uncontrolled growth of abnormal cells. The speed with which cancer can spread and the severity of the disease it causes depends on the type of tissue cell affected. As many as one in five cats are likely to develop one of the many different forms of cancer at some stage of their lives. The risk of developing cancer increases with age and some breeds are predisposed to certain cancer types.

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What causes cancer?

As with human cancers, the causes of cancer in cats are still not well understood. Possible causes include:

  • Toxic chemicals or exposure to harmful radiation.
  • Feline leukemia virus (which used to be a common cause in cats, prior to the vaccination era).
  • Abnormalities in the immune system that usually protect against infectious diseases.
  • Abnormal genes.

How do I know if my cat has cancer?

The signs of cancer are very variable and depend on the type of tissue cells involved, the site of the cancer and the stage of the disease. Animals with advanced cancer often show weight loss and loss of appetite. Your cat may be depressed, vomit, have diarrhea or constipation or fever. Your cat may also get tired easily due to anemia.

Is my cat at risk of developing cancer?

Cancer can occur in any animal at any age but certain types of cats are more susceptible to particular forms of cancer. Cats with white fur and skin that like to sunbathe are vulnerable to skin cancers especially on the ears, nose, lips and any other areas where the skin is exposed to direct sunlight. The risk of cancer developing may be reduced by applying sunscreen to areas of exposed white skin/hair on sunny days. Feline leukemia virus may be a cause of cancer in the unvaccinated cat, although not all cats exposed to the virus will develop the disease. Most cats are able to resist the virus but those that cannot, will develop permanent infection and 3 out of 10 of these will get some form of cancer.

Can cancer be treated?

Yes, most forms of cancer can be treated, but this depends on the type of cancer and whether the disease has spread. The outcome of treatment can be very variable. In some cases, treatment can produce a complete cure, or at least significantly increase the length or improve the quality of your cat’s life. Sometimes euthanasia is the only humane alternative to a slow and painful death.

There are three basic options for treating cancers, not all are appropriate for every case and sometimes a combination of treatments has the best chance of success. The treatment options are:

  • Surgical removal: usually the best choice for most cancers of solid tissue. If the cancer is relatively benign, or if a more malignant cancer has not yet spread to other parts of the body, surgical removal often produces very good results.
  • Chemotherapy (drug treatment): the best option for cancers affecting the blood or multiple areas of the body. Drug treatment may also prevent or delay the appearance of secondary tumors in other organs after surgical removal of the original lump. Chemotherapy in cats is used to improve their quality of life and the side effects of chemotherapy seen in people are rarely experienced or are milder than for people.
  • Radiotherapy (x-rays): often effective when tests have shown clearly the extent and size of the tumor. The radiation is usually delivered by a special machine in a radiotherapy unit and the treatment is done under anesthetic. A beam of radiation is most effective on cancers of the extremities (such as the limbs and head) where it is less likely to damage normal tissue before reaching the tumor. Radiotherapy units are only located in a few specialized centers and your veterinarian would need to refer you to a cancer specialist for this form of treatment. In some cases, it may be possible to treat the cancer by injecting radioactive material into the body.

Recently, more treatment options have been developed, which may apply to specific types of cancers:

  • Electrochemotherapy: an electrical current is applied on the tumor to increase intake of chemotherapy in the cancer cells. This may be suitable for cancer which are not amenable for surgery or that cannot be completely removed
  • Immunotherapy: this is a developing field, but vaccines are either available or in development for a few cancer types. Immunotherapy works best on low amount of disease, for example after surgery.

Will my cat be in pain?

Discomfort can be severe when cancer is advanced, but most cancer-related pain can be controlled. Your veterinarian will probably try a gentle painkiller at first and move on to more powerful drugs if these are required. Your veterinarian will try to improve your cat’s quality of life rather than prolonging the life of your cat if it is suffering.

Is diet important?

Careful attention to your cat’s diet may improve its quality of life. Cats need high-quality food to cope with the effects of a fast-growing tumor, but many cancer patients have a poor appetite and so lose weight. The high metabolism of some cancers will also reduce muscle mass and cause weight loss. Warming the food or feeding by hand may help stimulate your cat to eat. There are also special diets designed for animals with cancer which provide good nutrition even if your cat’s appetite is poor. An appetite stimulant drug or anti-nausea drugs can be prescribed by your vet to help increase food intake.

How long will my cat live?

This is the question that every owner wants answered but as with human cancer it is impossible for your veterinarian to give you an answer with any confidence. The survival chances will depend not only on the type and stage of the disease but also on your cat’s general state of health. You should discuss this issue with your own veterinarian so that you can agree between you an appropriate treatment plan for your cat. It is understandable that, faced with a diagnosis of cancer, you will feel frightened about the future for your cat – discussing your fears with your veterinarian is the very best way to obtain reassurance that you are doing what is right for your cat.

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