WatchIng “Fenbendazole, an over-the-counter dewormer drug used often to treat rodent pinworm infections in dogs, is fast becoming a successful anticancer drug treatment in many late-stage cancers in humans due to the experience of Joe Tippens over at MyCancerStory.rocks. After Joe was diagnosed with small cell lung cancer and told he had 3 months to live, the ever-optimist, positive-attitude advocate refused to accept his death sentence. At the advice of a veterinarian, Joe began taking a dog de-wormer called fenbendazole. Within 4 months his PET scan showed no cancer. He went from 50 tumors spread throughout his entire body to not a single one.