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Fenbendazole Enhancing Anti-Tumor Effect: A Case Series (2021)

https://www.scitechnol.com/peer-review/fenbendazole-enhancing-antitumor-effect-a-case-series-2Kms.php?article_id=14307&fbclid=IwAR0tYpTZb4fp2_AO8e_WGWM5mcqv-RNfI-5SID9OWDcRiwHyHmQBKsjeSKk

Full PDF with radiology

https://www.scitechnol.com/peer-review/fenbendazole-enhancing-antitumor-effect-a-case-series-P3SV.pdf

Background

Fenbendazole (FBZ) is a cheap and readily available anti-parasitic commonly used in veterinary medicine.

FBZ belongs to the benzimidazole drug class which destabilize microtubules through a mechanism similar to the anti-oncogenic vinca alkaloids.

Although there are no reported cases in the literature, there have been several anecdotal stories published on website blogs with individuals praising its ability to treat a wide variety of cancers.

Case Presentations

Three patients with various genitourinary malignancies,

who demonstrated complete response after receiving FBZ therapy,

as a single or supplementary chemotherapeutic agent.

In two patient scenarios, they had experienced progression of metastatic disease despite multiple lines of therapy prior to initiation of FBZ.

No side effects from FBZ were reported.

Conclusion

FBZ appears to be a potentially safe and effective antineoplastic agent,

that can be repurposed for human use in treating genitourinary malignancies.

Further research is necessary to define the role of FBZ as a chemotherapeutic option.

Details

FBZ is a cheap anti-helminthic medication commonly used in veterinary practice,

However, despite multiple anecdotal stories and news outlet reports for its efficacy in treating metastatic cancer,

the clinical literature behind utilizing FBZ as a potential anti-neoplastic agent remains nonexistent.

Case 1

A 63-year-old Caucasian male presented with flank pain, rapid weight loss, and transient fever.

Abdominal Computed Topography (CT) revealed a 3 cm left solid renal mass.

Renal Cell Carcinoma (RCC)

Traditional drugs used then discontinued

One month after discontinuation, repeat MRI showed increase in size of recurrent left renal mass, pancreatic head and body lesion

He also started alternative therapy with FBZ 1 gm three times per week at the suggestion of one of his friends with head/neck cancer.

Interval MRI imaging found near complete resolution of the previously noted left renal mass,

as well as decrease in pancreatic head/body and pelvic bone lesion

Serial imaging for the past 10 months have not shown any evidence of recurrence or metastatic disease.

He has continued taking FBZ without any reported side effects.

Case 2

A 72-year-old caucasian male

Urethral lesion

Distal penectomy
Pathology showing high-grade urothelial carcinoma of the urethra

Four years later, the patient developed a cough,

5.5 cm × 4.0 cm left hilar mass and a left upper lobe nodule, with multiple abnormal lymph nodes

Bronchoscopy with biopsy revealed squamous carcinoma, (probable primary)

Chemotherapy given

Developed progressive retroperitoneal disease

The patient opted for complementary therapy with FBZ 1 gram orally three days per week,

vitamin E 800 mg daily,

curcumin 600 mg daily,

and CBD oil

Serial CTs from the past 9 months showed progressive decrease in size to 0.5 cm × 0.5 cm, complete radiographic response.

Case 3

A 63-year-old Caucasian female

CT imaging revealed a 7.5 cm right lateral bladder mass with extensions

Hydronephrosis requiring percutaneous nephrostomy.

Transurethral Resection of Bladder Tumor (TURBT) demonstrated a large necrotic mass,

pathology confirming urothelial carcinoma with 85% squamous and 2% sarcomatoid histology.

6 cycles over the course of 4 months,
along with concurrent FBZ 1 gram three times weekly.

Follow-up CT revealed no evidence of disease with minimal residual thickening in the right inferior bladder wall

She declined to proceed with cystectomy and remains on surveillance with no evidence of progression.

Discussion

We have three patients with different primary genitourinary tumors who demonstrated complete response after receiving FBZ therapy.

This raises the question of how effective FBZ can be as an anti-oncogenic agent and merits further investigation.

FBZ belongs to a class of microtubule-destabilizing agents

The ability to disrupt microtubule polymerization,to induce mitotic arrest,

and promote apoptosis.

? p53 activation

The variety of mechanisms by which this class of medications functions may help limit the propagation of resistant cancer cell lines

FBZ has been safely utilized as an anti-parasitic for various different animal species and could be repurposed for treating human malignancies.

Several benzimidazoles have already shown promise for human repurposing.

Mebendazole has been shown in case reports to be efficacious with few side effects in patients with metastatic adrenocortical carcinoma and metastatic colon cancer

Mebendazole, effective in animal studies for glioblastoma

Flubendazole, animal studies, hematologic malignancies

Given evidence of high tolerability and applicability to a wide range of malignancies,

this warrants further investigation for FBZ and other benzimidazoles as safe chemotherapeutic options.

Conclusion

There remains limited data with few published studies on the anti-oncogenic properties of FBZ.

Other benzimidazoles have been studied to a larger extent,

and the knowledge can be drawn upon to help guide future FBZ studies,

and to gauge the efficacy of this drug class whether as a solitary agent or in combination therapy.

Given the potential benefits of FBZ with what seems to be a limited toxicity profile,

further research is warranted to evaluate the clinical settings in which this medication may be beneficial and repurposed,

for patients with progressive genitourinary malignancy and possibly in other malignant settings as well.