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Dog dewormers and anti-parasite drugs are promoted on social media as hidden cancer cures on the strength of cell-culture experiments and anecdotes. No clinical trial shows benefit in people, liver damage has been reported, and drug repurposing is real but works through trials, not forums.
Fenbendazole (a veterinary benzimidazole) and ivermectin inhibit microtubules or other pathways in cancer cell lines and animal models, as do the majority of compounds that show activity in a dish and never become drugs. A widely shared 2016 personal story of a lung cancer patient who took fenbendazole alongside a clinical trial drug and immunotherapy drove global demand, and ivermectin claims followed the pandemic. There are no completed clinical trials of either in cancer showing benefit; case reports describe severe liver injury with fenbendazole, and interactions with chemotherapy are unstudied. Legitimate repurposing candidates with some clinical evidence (aspirin, metformin, statins, propranolol, mebendazole in early trials for glioma) go through registered trials and are discussed in the corpus separately. The MSK About Herbs database and cancer charities publish plain-language rebuttals; the underlying problem, that cheap generics attract no sponsor, is a real bottleneck.
Microtubule disruption and other in-vitro effects at concentrations far above those achieved by veterinary or antiparasitic dosing in humans.
Fenbendazole is a dog and livestock dewormer that is sold online as a cancer cure. It has never been approved for people, no trial has tested it in cancer, and doctors have reported severe liver injury in patients who took it.
Ivermectin is a worm and parasite medicine that is being tested as an add-on to immunotherapy in two small early trials. No trial has shown that it treats any cancer, and people who have dosed themselves outside a trial have ended up in hospital with seizures or liver damage.
Mebendazole is a human worm medicine that has been through two very small cancer trials: a dose-finding study in brain tumours found a tolerable dose, and a study in advanced bowel and stomach cancers saw every patient's cancer keep growing.
A case series selected by its authors from a decade of practice cannot show that any drug worked, and the selection method has no scientific basis.
Measures the reach of the claim rather than the drug: tens of thousands of prescriptions written on the strength of a podcast, with no trial behind them.
Shows why single stories cannot settle the question: a melanoma this immunogenic can wax and wane on its own, and the improvement did not last.
This is the paper most often quoted online as proof. Patients reporting how they feel to the company that sold them the treatment, with 38 percent not answering, cannot show whether a cancer shrank, and the journal is now checking whether the underlying records exist.
For a patient with a gynaecological cancer, the specialists who would run such a trial say the evidence does not exist yet.
The clearest recent statement of where the evidence stands: promising in a dish, untested in people, and already causing harm through self-dosing.
A measured position a patient can take to their oncologist: the drug is being tested properly, and until those tests report, it is not a treatment.
This paper circulates widely online. Anyone quoting it should know that the journal has withdrawn it.
Query for this technology: (TITLE:"Fenbendazole, ivermectin and other internet 'repurposed cures'" OR ABSTRACT:"Fenbendazole, ivermectin and other internet 'repurposed cures'") AND (cancer OR tumor OR tumour OR oncology OR carcinoma OR lymphoma OR leukemia OR leukaemia OR myeloma OR sarcoma OR melanoma OR glioma). Results are unfiltered search hits about Fenbendazole, ivermectin and other internet 'repurposed cures', not a curated reading list.
Shares Alternative medicine used instead of standard treatment, Evidence-based integrative oncology, Misinformation and unproven therapies and the tags complementary, supportive-care.
Shares Alternative medicine used instead of standard treatment, Evidence-based integrative oncology, Misinformation and unproven therapies and the tags complementary, supportive-care.
Shares Alternative medicine used instead of standard treatment, Evidence-based integrative oncology, Misinformation and unproven therapies and the tags complementary, supportive-care.
Shares Alternative medicine used instead of standard treatment, Evidence-based integrative oncology, Misinformation and unproven therapies and the tags complementary, supportive-care.
Shares Alternative medicine used instead of standard treatment, Misinformation and unproven therapies and the tags complementary, supportive-care.
Shares Evidence-based integrative oncology, No incentive to repurpose cheap drugs, Misinformation and unproven therapies and the tags complementary, supportive-care.
Shares Evidence-based integrative oncology, Misinformation and unproven therapies and the tags complementary, supportive-care.
Shares Evidence-based integrative oncology, Misinformation and unproven therapies and the tags complementary, supportive-care.