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This is the lead to the article I wish to improve. The article is Cancer in Dogs:

Cancer is the leading cause of death in dogs[1]. It is estimated that 1 in 3 domestic dogs will develop cancer, which is the same incidence of cancer among men[2]. Dogs can develop a variety of cancers and most are very similar to those found in humans. Dogs can develop carcinomas of epithelial cells and organs, sarcomas of connective tissues and bones, and lymphomas or leukemias of the circulatory system. Certain breeds are known to be at high-risk for specific cancers as a result of selective breeding[1]. Veterinary oncology is the medical study of cancer in animals. Veterinarians that specialize in cancer diagnosis and treatment are called veterinary oncologists.

Causes

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Cancer is a complex, multifactorial disease[2]. Carcinogenesis is linked with DNA mutations, chromosomal translocations, dysfunctional proteins, and aberrant cell cycle regulators[1]. Cancer alters the DNA of cells and the mutated genetic material is passed on to daughter cells, resulting in neoplasms[2]. The mutated DNA effects genes involved with the cell cycle, classified as either oncogenes or tumor supressor genes[2]. Oncogenes are responsible for cell proliferation and differentiation[2]. Oncogenes responsible for cell growth are overexpressed in cancerous cells. Tumor supressor genes prevent cells with erroneous cell cycles from replicating[2]. Cancer cells ignore cell cycle regulators that control cell growth, division, and death.[2]

However, it is known that inherited, epigenetic and environmental factors can contribute to the development of cancer in dogs.[2][3]

The selective breeding techniques used with domestic dogs causes certain breeds to be at high risk for specific cancers. Selection for specific phenotypes in dog breeding causes long-range linkage disequilibrium in their DNA[1]. Certain areas of alleles have the tendency to separate less frequently than normal random segregation, which leads to long ranges of repeated DNA sequences. These repeated sequences caused by decreased genetic diversity within breeds, can lead to a high prevalence of certain diseases and especially cancer in breeds.

Notes

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  1. ^ a b c d Gardner, Heather L.; Fenger, Joelle M.; London, Cheryl A. (2016). "Dogs as a Model for Cancer". Annual Review of Animal Biosciences. 4 (1): 199–222. doi:10.1146/annurev-animal-022114-110911.
  2. ^ a b c d e f g h Pang, Lisa (8 March 2016). "Veterinary oncology: Biology, big data and precision medicine". www.sciencedirect.com.ezproxy.neu.edu. Retrieved 2016-11-20.
  3. ^ "Pet Care Cancer". ASPCA.