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Fenbendazole is presented as not simply a dog dewormer, but a drug with broad veterinary use and potential human relevance. It binds to tubulin in parasites, preventing movement and glucose use, causing death. It treats nematodes, flukes, and protozoa like Giardia, across species from cattle to bears. It is not widely approved for human use, unlike its cousins mebendazole and albendazole, which are approved for people; fenbendazole is approved for animals. In 2016, Joe Tippins, with small cell lung cancer at MD Anderson, after hospice, tried fenbendazole on advice of a large-animal vet; within three months his scans were clean and remain so. Mechanistically, fenbendazole disrupts microtubules, halting mitosis and triggering apoptosis, arrests at G2, upregulates p53 and p21, and inhibits Hexokinase II, reducing glycolysis. It may enhance immune recognition and revert tumor-associated macrophages from M2, contributing to tumor control.