13/12/2025
Mebendazole is not an approved treatment for colon cancer, but it is being studied as a potential adjunct (repurposed) anti-cancer drug.
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What is mebendazole?
• An anti-parasitic medication commonly used for intestinal worms
• Has been safely used for decades at standard doses
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Why is it being studied in colon cancer?
1. Anti-cancer mechanisms (preclinical evidence)
Laboratory and animal studies suggest mebendazole may:
• Disrupt microtubules → inhibits cancer cell division (similar pathway to some chemotherapy drugs)
• Inhibit angiogenesis → reduces tumor blood supply
• Induce apoptosis → promotes cancer cell death
• Suppress signaling pathways involved in tumor growth (e.g., Wnt/β-catenin, relevant in colon cancer)
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2. Evidence so far
• Cell culture & animal studies:
Show growth inhibition of colorectal cancer cells
• Case reports / small observational studies:
Anecdotal reports of disease stabilization when used off-label
• Clinical trials:
• Early-phase trials are ongoing or exploratory
• No large randomized controlled trials proving benefit in colon cancer yet
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Current medical position
• ❌ Not standard of care
• ❌ Not FDA-approved for colon cancer
• ⚠️ Should not replace surgery, chemotherapy, radiation, or immunotherapy
• ✅ May be considered only within clinical trials or with specialist oversight
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Dosing issues (important)
• Anti-parasitic doses are much lower than doses explored in cancer research
• High or prolonged doses may cause:
• Liver enzyme elevation
• Bone marrow suppression (rare)
• Drug interactions (e.g., with chemotherapy)
👉 Self-medication is strongly discouraged