Tumors of Smooth Muscle in Cats/Dogs |
Leiomyomas (benign tumors) Leiomyomas are benign (noncancerous) tumors that arise from smooth muscle (type of muscle found within the "walls" of hollow organs like the bladder and abdominal cavity, the uterus, the gastrointestinal tract, the respiratory tract, the vasculature, the skin, etc). The gastrointestinal tract is the most commonly affected but other sites where these tumors have developed include the spleen, liver, genitourinary tract, or subcutaneous tissue (the layer of tissue directly underlying the skin). As a result of these tumors, the pets can develop medical symptoms such as hypoglycemia (low blood sugar) or nephrogenic diabetes insipidus. Leiomyomas are typically small, localized and well encapsulated (enclosed). Leiomyomas of the vagina and vulva often protrude from the vulva and are hormone-dependent. The recommended treatment for this type of tumor is ovariohysterectomy. Leiomyosarcomas (malignant tumors) Leiomyosarcomas are malignant (cancerous) tumors that can form at various anatomical sites throughout the body, typically in older pets, and that have the potential to metastasize (spread) to distant organs within the body. The metastatic rate for dogs with liver leiomyosarcoma is 100% but usually drops to less than 50% for leiomyosarcomas in the intra- abdominal sites and drops to 0% for dermal leiomyosarcomas (tumors right beneath the skin). Gastrointestinal leiomyosarcomas commonly metastasize to regional lymph nodes and liver, but cases of metastases to the spleen and kidneys have also been reported. The recommended course of treatment for leiomyosarcoma is a surgical removal of the tumor. The median survival for dogs with gastrointestinal leiomyosarcoma that survived the surgery is up to 21.8 months, 8 months for dogs with spleen leiomyosarcoma and 0 months for dogs with liver leiomyosarcoma. Does cancer cause pain in pets? Pain is common in pets with cancer, with some tumors causing more pain than others. In addition to pain caused by the actual tumors, pets will also experience pain associated with cancer treatments such as surgery, radiation therapy or chemotherapy. Untreated pain decreases the pet's quality of life, and prolongs recovery from the illness, treatment or injury. It is, therefore, essential that veterinary teams that are taking care of pets with cancer should also play a vital role in educating pet owners about recognizing and managing pain in their pets. The best way to manage cancer pain in pets is to prevent it, a term referred to as preemptive pain management. This strategy anticipates pain ahead of time and administers pain medication before the pet actually experiences pain, thus ensuring the pet's maximum comfort. To learn more about how to recognize pain in pets with cancer and what cancer pain management options are available for your pet, please visit the Cancer Pain Management section. How important is nutritional support for pets with cancer? Cancer cachexia (a term referring to progressive severe weight loss) is frequently observed in pets with cancer. Pets with cancer lose weight partly because of lack of appetite and partly because of cancer-induced altered metabolism. Some of the causes for decreased appetite are related to the cancer itself (for example, tumors may physically interfere with food chewing, swallowing, and digestion process) and some may be related to the side effects of cancer treatment (for example, some chemotherapy drugs cause nausea and vomiting, and radiation therapy can cause mouth inflammation). Proper nutrition while undergoing cancer treatment is essential to maintain your pet's strength, improve survival times, quality of life and maximize response to therapy. Adequate nutritional support was shown to decrease the duration of hospitalization, reduce post-surgery complications and enhance the healing process. Additionally, pets with cancer need to be fed diets specifically designed to provide maximum benefit and nutritional support for the patient. To learn more, please visit the Cancer Nutrition section. Are there any clinical trials investigating new treatments? There are several clinical trials ongoing for dogs with soft tissue sarcomas in pets, which are partially funded by the institutions. To learn more about these trials, please visit the Clinical Trials for Soft Tissue Sarcoma in Dogs section. Additionally, there are several clinical trials available for cats and dogs with any tumor type for which your pet may qualify. To learn more these trials (which are partially or fully funded by the institutions), please visit the Dog Clinical Trials (any tumor type) or Cat Clinical Trials (any tumor type) section. To learn more about veterinary clinical trials in general, please visit the Pet Clinical Trials section. Sources:
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PET CANCER CENTER Comprehensive guide to cancer diagnosis and treatment in cats and dogs |