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everything you touched. it was horrible. >> reporter: so you were inhaling all this dust. >> every day, all day. >> reporter: gentlemen von thomas was one of thousands who descended on ground zero to help. he set up portable toilets for the emergency workers, ten hours a day, seven days a week. after a year at ground zero, he began to feel a stabbing pain. >> and it was growing here. there was a lump. i went and i had a biopsy. and it came back that it was cancer. >> reporter: a rare cancer called an enthey'll aid sarcomaa. he needed extensive reconstructive surgery and six months of chemotherapy. and then with his scarred arm he went right back to work at ground zero. and another lump came. >> reporter: they found cancer here. >> right. >> reporter: then here. >> right. >> reporter: two tumors within two years. thomas started to think the toxic dust caused his cancer. so that's where you think your san certify started. >> yes, i'm 100% sure about

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