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Similarly to humans, cancer is the leading cause of death among older cats. It is caused by uncontrolled cell growth, and affects a wide range of cell types and organs in the body. Feline cancer initially manifests as a lump or bump on any parts of the body. It rapidly grows in the affected cell; attaches itself to the tissue under the skin in that area; and, depending on the tumour, it can spread to other parts of the body. Although cancer accounts for approximately 32% of deaths in cats over ten years old, it can be successfully treated if diagnosed early.

While the causes of cancer in cats are unknown, feline leukemia virus is suspected to be a prime contributor. Other factors suspected to increase rates of feline cancer include toxins from the environment, second hand smoking, excessive grooming, or licking parts of the body that have been in contact with an environmental toxin.

Cancer can be detected early on by observing for certain signs and symptoms. Common diagnosing methods include physical examination, x-rays, ultrasounds, cytology, blood tests, urine tests, and nuclear scans. Depending on the type of cancer and its level of progress, surgery, radiation, chemotherapy, or immunotherapy may be utilized to treat for cancer. Although research has been slow for causes and treatment of feline cancers, there have been advancements in radiation therapy, as well as newer and improved chemotherapy procedures.


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Signs and symptoms

Although cats are diagnosed with cancer at lower rates than dogs or humans, the types of cancer and symptoms are identical. Cancer in cats can occur in any location or body system, and most symptoms can be detected externally. However, to reach a definitive diagnosis, further tests such as blood and urine tests, cytology, and biopsy are required. Due to the excessively aggressive nature of cancer in cats, it is advisable for owners to take their cat to a veterinarian for an examination following occurrence of any symptom to prevent spreading.

General signs of feline cancer

While each type of cancer has its own distinctive symptoms, most of them can indicate their presence by the occurrence and the prolonged presence of any common symptom. Some of the general symptoms of cancer in cats are:

  • Any lump that changes shape or size
  • Any sore that does not heal
  • Change in bowel or bladder habits
  • Difficulty eating or swallowing
  • Difficulty urinating or defecating
  • Unexplained bleeding or discharge from body
  • Loss of appetite
  • Chronic weight loss
  • Coughing or difficulty breathing
  • Stiffness
  • Oral odor

Note that ravenous hunger, while a sign of other diseases like hyperthyroid, can also be a sign of cancer.

Symptoms of common types of cancer

Lymphoma

Lymphoma is the most common form of cancer in cats, which is often associated with feline leukemia virus, and accounts for 25 percent of all cases. Feline lymphoma usually strikes the digestive system, causing excessive vomiting and diarrhea. Other common symptoms of lymphoma in cats include swollen lymph nodes, loss of appetite, weight loss, and difficulty breathing.

Feline skin tumors

Skin tumors are less common in cats; and although most cats are vulnerable, white cats are especially prone to this type of tumor. Feline skin tumor manifests as a visible lump on the skin, mostly affecting vision, smell, or eating. Benign tumors take several years to develop and are more difficult to detect due to their freely movable nature. The only indicator of benign tumors is self-trauma, which can be caused by excessive licking by the cat.

Mammary gland tumors

Mammary gland tumors are the third common type of cancer in older female cats, with the most common symptom manifesting as a lump in the breast tissue. The tumor is typically firm and nodular, and adheres to the overlying skin. Nipples may also appear to be red and swollen, oozing yellowish fluid.

Abdominal Tumors

Abdominal tumor is among the rarest forms of cancer in cats, and most difficult to treat successfully before progressing to an advanced stage. The main symptoms include abdominal enlargement, vomiting (often with blood), weight loss due to poor digestion, and weakness.


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Treatment

Types of Tumors

When cancer is determined as the illness affecting the cat, an important part of the healing process is determining the type of cancerous tumor present. This is helpful in selecting the best therapeutic approach and increases chances of recovery.

Diagnosing Methods

As soon as a tumor is detected, diagnosing the type of cancer remains a primary objective, as it helps determine the best possible treatment by the analysis of the structure of the tumor and cancer cells.

Treatment Methods

Treatments of cancer in cats usually consists of diagnosis and observation of the tumor to determine its type and size, the development of a treatment plan, the associated goals on the part of the treatment methods, and the regular evaluation of the overall health of the pet.


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Prevention

The prevention of feline cancer mainly depends on the cat's diet and lifestyle, as well as an ability to detect early signs and symptoms of cancer prior to advancement to a further stage. If cancer is detected at an earlier stage, it has a higher chance of being treated, therefore lessening the chances of fatality. Taking domesticated cats for regular checkups to the veterinarian can help spot signs and symptoms of cancer early on and help maintain a healthy lifestyle. Further, due to advancements in research, prevention of certain types of feline illnesses remains possible. A widely known preventative of feline leukemia virus is the vaccine which was created in 1969. Subsequently, an immunofloures-cent antibody (IFA) test for the detection of FeLV in the blood of infected cats was formulated. The IFA test was mainly used to experiment the chances of felines being exposed to cancer. The results showed that 33% of cats who were exposed to FeLV related diseases were at a higher risk for acquiring it, while the cats that were left unexposed were left unaffected. FeLV is either spread through contagion or infection and once infected it is possible for cats to stay that way for the rest of their lives.

Interaction with other Cats

Interaction with other cats with strains or diseases related to FeLV can be a great risk factor for cats attaining FeLV themselves. Therefore, a main factor in prevention is keeping the affected cats in quarantine from the unaffected cats. Stray cats, or indoor/outdoor cats have been shown to be at a greater risk for acquiring FeLV, since they have a greater chance of interacting with other cats. Domesticated cats that are kept indoors are the least vulnerable to susceptible diseases.

Vaccines

Vaccines help the immune system fight off disease causing organisms, which is another key to prevention. However, vaccines can also cause tumors if not given properly. Vaccines should be given in the right rear leg to ease tumor removal process. Vaccines given in the neck or in between the shoulder blades are most likely to cause tumors and are difficult to remove, which can be fatal to cats. Reducing the number of vaccinations given to a cat may also decrease the risk for it developing a tumor.

Spaying and Neutering

Spaying and neutering holds many advantages to cats, including lowering the risk for developing cancer. Neutering male cats makes them less subjected to testicular cancer, FeLV, and FIV. Spaying female cats lowers the risk for mammary cancer, ovarian, or uterine cancer, as it prevents them from going into heat. Female cats should be spayed before their first heat, as each cycle of heat creates a greater risk for mammary cancer. Spaying a female cat requires the removal of the ovaries and uterus, which would eliminate their chances of developing cancer in these areas.

Exposure to Sun

The risk of skin cancer increases when a cat is exposed to direct sunlight for prolonged periods. White cats, or cats with white faces and ears, should not be allowed out on sunny days. Between the hours of 10:00 am to 4:00 pm, it is recommended to keep domesticated cats indoors, as the sun is at its highest peak between these times. Sun block is also available for cats, which can help prevent skin irritation, and a veterinarian should be contacted to find out which brands are appropriate and to use on cats.

Exposure to Secondhand Smoke

Cats living in a smoker's household are three times more likely to develop lymphoma. Compared to living in a smoke-free environment, cats exposed to secondhand smoke also have a greater chance of developing squamous cell carcinoma or mouth cancer. Cancer is also developed mostly due to the cat's grooming habits. As cats lick themselves while they groom, they increase chances of taking in the toxic, cancer-causing carcinogens that gather on their fur, which are then exposed to their mucus membranes.

Lifestyle

Providing a cat with the healthiest lifestyle possible is the key to prevention. Decreasing the amount of toxins, including household cleaning products, providing fresh and whole foods, clean and purified water, and reducing the amount of indoor pollution can help cats live a longer and healthier life. To lessen susceptibility to diseases, domesticated cats should be kept inside the household for most of their lives to reduce the risk of interacting with other stray cats that could be infected with diseases.


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Research

Laboratory cats have been used in research for a wide range of diseases including stroke and diabetes to AIDS. Less than 1% of research on animal illnesses have been dedicated to cats.

Despite opposition from organizations such as those advocating animal rights, controversial animal testing is still used in cancer research centers. These research practices are continually being conducted on the basis that its benefits to humans outweigh the costs to humans, despite the unfair costs to innocent non-human animals. In some US states, animal testing laboratories get some of their feline test subjects from animal shelters.

According to Kim Sterling, associate teaching professor of oncology at the University of Missouri College of Veterinary Medicine, the use of small animals in predicting human health care procedures is of significant benefit to humans because they are affected in similar, but not exactly the same, ways by the same diseases. This is the same analogy used in reference to cats and their unwilling role in advancing human cancer treatment research.

It is research like this that has led to a potential link between cat parasites and brain cancer in humans. Cats carry the parasite toxoplasma gondii. According to research ecologist Kevin Lafferty, of the University of California, Santa Barbara, this parasite is known to "behave in ways that could stimulate cells towards cancerous states". Therefore, research on cats with this parasite can help to better understand the risks of brain cancer for humans in contact with such cats.

Cats have also been used to further studies in the field of Cancer stem cell research. Small animals, like cats, experience faster rates of cancer development. As a result, they are good preclinical models for understanding processes like immortalization and its role in promoting cancerous tumors. The absence of immortalization means a cell can no longer undergo malignant transformation. Since these transformations are the basis for cancerous cell reproduction, this research can prove useful for future cancer treatments and understanding how to stop the spread of cancer in the body.

However, feline cancer research is not limited to what laboratory cats can do for other animals, there is also research being done by humans to see what can be done to improve treatment options for feline cancer. Advances, though slower than that in other animals, are being made in the field of feline cancer. This includes advances in chemotherapy research, immunization protocols and radiation therapy. In addition, there are clinical trials offering trial research treatment options for cats with cancer.

One of such treatments is the cat's claw. Although they share the same name, the cat's claw (also known as Uncaria tomentosa or uña de gato) refers not to the animal cat but to a native plant of the Amazon Rainforest in Peru, South America. Cat's claw is still under research for its immunotherapic, antiproliferative abilities in suppressing cancer proliferation in humans; however, it has been deemed suitable for cat cancer treatment.

Nonetheless, feline cancer research into this, as well as other treatment options, remains an ongoing process.

Source of the article : Wikipedia



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