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The problem I think is that first you need to identify the cancer smell if even one exists and programme the machine to detect that smell. Maybe I am mistaken.
Check this link out, I must have caught this subconsciously from somewhere. Or I just re invented something that was invented last year!http://www.newscientist.com/article/dn3702-electronic-nose-sniffs-out-lung-cancer.html
One of my dogs, was increasingly obsessed by my uncles feet when he was dieing from (a particualrly unpleasantly aggressive) cancer. It turned out that there was some form of secondary tumour in his left foot. This is of course purest annecdote and in no way a scientific observation, it may have a perfectly simple explanantion such as my uncle struggled to clean his feet...It just seemed a little bit too much of a coincidence.As an aside, as far as I know the mechanisms wherby smells are detected/ identified biologicaly is not fully understood.