Oncology

Soft tissue sarcomas of the cat come in several forms. Injection site sarcomas/Vaccine associated sarcomas are the most common sarcomas seen in feline patients today.

Mast cell tumors (MCT) are the most common skin tumors in the dog. They represent 16-21% of all skin tumors. There are two forms in the dog, the dermal form and visceral form in the dog.

Lymphoma is considered to be the most common cancer in the cat. Lymphoma can affect cats of any age group and any breed. There seems to be biphasic occurrence with a peak in young cats and then another peak in middle aged to slightly older cats.

Bladder tumors represent < 2% of all canine malignancies. Transitional cell carcinoma is the most common histologic type diagnosed in both cats and dogs.

Osteosarcoma (OSA) is the most common primary bone tumor in dogs accounting for up to 85% of bone tumors in the dog.

A certain scent is associated with lung cancer, and dogs can detect it.

Carvallis, Ore. - Canine cancer is presenting new opportunities for veteirnary and medical researchers to develop new treatment strategies.

Davis, Calif. - A protein recently identified by veterinary researchers at the University of California-Davis may be key to diagnosing and treating lymphoma in animals and humans.

Detecting this mainly localized disease process early is difficult but important to improve an animal's prognosis.

Soft tissue sarcomas comprise 7% and 15% of all skin and subcutaneous tumors in cats and dogs, respectively. The annual incidence of soft tissue sarcomas in companion animals is approximately 17 per 100,000 cats and 35 per 100,000 dogs.

Mast cell tumors (MCT) are the most frequently encountered dermal/subcutaneous neoplasm in dogs representing 7% to 21% of all skin tumors in this species. Most MCT develop in older dogs and no sex predilection has been reported.

Most primary tumors are best treated by surgical excision. Most benign tumors, low grade cutaneous mast cell tumors, odontogenic tumors, or solitary mammary tumors are perhaps best treated by wide surgical excision.

Nasal and paranasal sinus tumors represent only 1-2% of all tumors but 60-80% of all canine respiratory tract tumors, and are even less frequent in cats. Nasal tumors occur most commonly in the nasal cavity with secondary extension into the frontal and other paranasal sinuses.

The process of radiation oncology from the time of patient identification to completion of radiation therapy is undoubtedly a complex one and requires significant communication between all services from the moment a potential radiation patient is seen and certainly prior to any surgical intervention. Listed below is an outline of the radiation process and treatment considerations at each step.

Tyrosine kinases are proteins that phosphorylate other proteins on tyrosine residues thereby regulating cell growth and differentiation. They bind ATP and use this to add phosphate groups to key residues on themselves (termed autophosphorylation) and on other molecules, resulting in intracellular signaling and alterations in gene transcription that affect cell proliferation and survival.

In a recent study, researchers evaluated the use of indwelling, double-pigtail ureteral stents in dogs with ureteral obstruction secondary to trigonal malignancy.

Dr. Matthew Beal discusses this promising noninvasive alternative to cystostomy tubes.

Why it's important to stage cancer in dogs and cats before pursuing therapy.

Clinicopathologic features of these infrequently described tumors in dogs.

Surgeon Dr. Jenifer Newton discusses whether this is a good step to take before attempting removal.

Radiation was first used on horses in 1906. Today, finer, more sophisticated therapeutic techniques, procedures and equipment can be used to treat the relatively uncommon tumors in horses.

Identifying characteristics of esophageal leiomyoma.

Learn about the potential anticancer effects of piroxicam.

After decades of significant increase, delay adjusted rates stabilized in 1995 and fell since 1999.

Dr. Timothy Fan discussses the use of Neoplasene in cancer therapy.

While cytology does not give the practitioner the same amount of information as histopathology does, it can provide important information that is rapidly available, inexpensive, and minimally invasive. Cytology can provide important information that can change how subsequent treatment and diagnostics take place.

Soft tissue sarcomas (STS) – hemangiopericytoma, fibrosarcoma, neurofibrosarcoma, Schwannoma, peripheral nerve sheath tumor, malignant fibrous histiocytoma, liposarcoma, myxosarcoma, myxofibrosarcoma, spindle cell sarcoma, anaplastic/undifferentiated sarcoma – exhibit similar biological behavior, and hence can be dealt with in most cases with a similar therapeutic approach.

Cancer is a disease characterized by dysregulated growth, abridged cell death, and enhanced cell migration, invasion and angiogenesis. While the molecular mechanisms responsible for this phenotype are very diverse, one class of molecule that has been receiving a great deal of recent attention as a target for therapy are the receptor tyrosine kinases (RTKs).

The majority of cytotoxic chemotherapy protocols in common veterinary use are designed to have a low risk of adverse effects. In general, less than 1 in 4 animals will have unpleasant adverse effects and only approximately 5% will have a serious adverse event, leading to hospitalization.

The past 5 years have brought about some noteworthy and exciting changes in veterinary oncology, many of which are available to the practitioner or the client willing to consider referral. A brief discussion of these advances, their applications, and potential for the future, may be helpful in informing the clinician and the dedicated client. Some of these may be covered in greater detail in other lectures in this series.