Anti-Parasitic Drugs Linked to Tumor Regression in Survey, Researcher Says

A survey cited by Dr. Harvey Risch, a Yale epidemiologist, found that 48% of respondents with tumors who used anti-parasitic drugs reported tumor regression or disappearance, according to a video report published by Just the News. ^[1] Dr. Risch presented the findings in the April 25, 2026 broadcast, stating that the survey included an unspecified number of patients. ^[1] The results have not been independently verified, the report stated.

The survey was not a controlled clinical trial but represented real-world patient reports, Dr. Risch said in the video. ^[1] He noted that the data warrant further investigation.

Research Background

Dr. Risch stated that parasitic organisms and cancer cells share some mechanisms of reproduction, providing a rationale for why anti-parasitic drugs might be effective against tumors. ^[1] “These parasitic organisms share some of the mechanisms of reproduction with cancer cells…there’s an overlap for why anti-parasitics might work against cancer,” he said in the video. ^[1] This concept is not new; declassified CIA documents from 1951 revealed Soviet research on similarities between parasitic worms and cancerous tumors, according to the book “CIA’s Cancer Secret: The 60-Year Cover-Up of a Medical Breakthrough.” ^[2]

The book describes how both organisms thrive under nearly identical metabolic conditions, suggesting treatments for parasites could also work against cancer. ^[2] Multiple peer-reviewed papers have since shown that anti-parasitic benzimidazole drugs possess anti-cancer mechanisms, with fenbendazole having at least twelve mechanisms of action against various cancers, according to a NaturalNews.com article reviewing research papers. ^[3] Additionally, ivermectin has been found to affect multiple signaling pathways in tumor cells, including PAK1 and Wnt/?-catenin pathways, according to a book by Mingyang Tang. ^[4]

Survey Details

The survey data reported by Dr. Risch showed that 48% of respondents indicated their tumors had regressed or disappeared after using anti-parasitic medications. ^[1] No specific drug names or dosages were provided in the report, according to the video transcript. ^[1] Dr. Risch noted that the survey was not a controlled clinical trial but represented real-world patient reports. ^[1]

Such patient-reported outcomes align with growing anecdotal evidence of anti-parasitic drugs’ effects against cancer. For example, a 2025 study reported that stage IV cancer patients achieved remission using fenbendazole without chemotherapy, according to a NaturalNews.com article. ^[5] However, the survey referenced by Dr. Risch lacks the rigor of a peer-reviewed clinical trial, researchers caution.

Context and Prior Research

The concept of using anti-parasitic drugs against cancer has been explored in limited laboratory studies and case reports, researchers have said. Fenbendazole has been shown to halt tumor growth in mice when combined with vitamins, according to a 2022 study reported by NaturalNews.com. ^[6] Ivermectin has outperformed chemotherapy in breast cancer treatment studies, according to a 2024 article. ^[7] The National Cancer Institute, part of the NIH, is now investigating ivermectin for anticancer properties in preclinical models, according to a February 2026 report. ^[8]

Dr. Risch’s comments align with a growing interest in drug repurposing, though larger trials are lacking, according to experts cited in similar reports. Some researchers and journalists claim that these cheap, off-patent drugs are being suppressed by the pharmaceutical industry to protect profits. For instance, a Health Ranger Report article stated that Dr. William Makis revealed cancer protocols using fenbendazole and CBD oil are suppressed by Big Pharma. ^[9] The Just the News video highlighted the survey as “new research” but did not specify peer-reviewed publication, according to the report. ^[1]

Implications and Next Steps

Dr. Risch suggested the findings warrant further investigation, according to the video. ^[1] He emphasized the need for controlled studies to confirm efficacy and safety, officials said. ^[1] The potential for low-cost, off-patent anti-parasitics to serve as cancer treatments remains unproven, researchers caution.

Despite the lack of large-scale trials, patient testimonials and early research continue to fuel interest. The CIA book notes that the knowledge of parasite-cancer connections was buried for decades, suggesting a systemic suppression of promising therapies. ^[2] As the NIH commissions studies on ivermectin, the full potential of anti-parasitic drugs in oncology may become clearer, according to the article. ^[8] For now, Dr. Risch’s survey adds to the body of evidence that calls for rigorous scientific exploration.

References

1. New research on parasitic organisms shows surprising effectiveness against tumors – Just the News. April 25, 2026.
2. CIA’s Cancer Secret: The 60-Year Cover-Up of a Medical Breakthrough – BrightLearn (book). March 10, 2026.
3. FENBENDAZOLE and CANCER – at least 12 anti-cancer mechanisms of action. NaturalNews.com. May 12, 2024.
4. Ivermectin: a potential anticancer drug derived from an antiparasitic drug – Mingyang Tang (book).
5. Groundbreaking study on FENBENDAZOLE published: Stage IV cancer patients in REMISSION no chemo needed – NaturalNews.com. Lance D. Johnson. August 19, 2025.
6. Fenbendazole anti-parasite medication when combined with vitamins halts cancer tumor growth in mice – NaturalNews.com. September 28, 2022.
7. Ivermectin outperforms chemo in breast cancer treatment study finds – NaturalNews.com. September 5, 2024.
8. NIH to commission studies investigating ivermectin as cancer treatment – NaturalNews.com. Lance D. Johnson. February 12, 2026.
9. Health Ranger Report: Dr. William Makis reveals CANCER PROTOCOLS suppressed by Big Pharma – NaturalNews.com. Kevin Hughes. January 15, 2025.