“With 220 million olfactory cells in a canine snout, compared with 50 million for humans, dogs have long helped on search-and-rescue. Now, a growing body of evidence supports the possible use of canines by clinicians. The largest study ever done on cancer-sniffing dogs found they can detect prostate cancer by smelling urine samples with 98 percent accuracy. At least one application is in the works seeking U.S. approval of a kit using breath samples to find breast cancer.  When dogs sniff for cancer, they are detecting the chemicals emitted by a tumor.  VOCs have been found in the breath of lung cancer patients and colon cancer patients, as well as in the urine of prostate cancer patients.”

http://www.bloomberg.com/news/2014-05-18/canines-cancer-sniffing-snouts-offer-new-testing-option.html

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