Dogs help sniff out ovarian cancer in new study

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Cancer Sniffing Dogs
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Cancer Sniffing Dogs
In this Thursday, Aug. 1, 2013 photo, Jonathan Ball, right, introduces Marta Drexler, an ovarian cancer patient, to McBaine who is in the first round of training for a study that will eventually involve detecting cancerous tissue at Penn Vet Working Dog Center in Philadelphia. Drexler donated ovarian cancer tissue for the study. (AP Photo/Matt Rourke)