# Fenbendazole and TP53

This page covers the p53-dependent part of the fenbendazole question.

The short version is:

**Fenbendazole tends to work better when the tumour still has functional p53.**

That does not mean it becomes irrelevant in p53-mutant cancer. It means one of its best-known mechanisms is weakened when tumour p53 is mutated or absent.

### Why TP53 type matters here

The key preclinical finding is that fenbendazole appears much more effective in tumour cell lines with somatic **wild-type p53** than in cell lines with **mutant or null p53**.

This makes the relevant question a **somatic tumour question**, not a SNP or a germline one:

* Does the tumour still have functional p53?
* Or is the tumour p53-mutant or p53-null?

This is why [Somatic TP53](/myhealingcommunity-docs/testing-monitoring-and-biomarkers/tp53-in-cancer/somatic-tp53.md) is the page that directly informs this issue.

### The p53-dependent mechanism

In the tumour with p53-intact setting, fenbendazole appears to promote tumour cell death, partly by activating p53-linked apoptotic signalling.

If the tumour has:

* **wild-type p53 t**he p53-dependent apoptotic route is more available
* **mutant p53** then that apoptosis route is impaired
* **If p53 is null, then that apoptosis route is unavailable.**

### What this does *not* mean

It does **not** mean fenbendazole is automatically useless in p53-mutant or null cancer cells.

Fenbendazole has other proposed mechanisms that are not fully dependent on p53, including:

* microtubule disruption
* effects on glucose handling
* proteasome-related effects

So the better way to say it is:

* p53-intact tumours may retain more of fenbendazole's key mechanism set
* p53-mutant or p53-null tumours may lose a key part of that mechanism set

### Practical interpretation

If someone asks, *"Why did fenbendazole seem to help one person more than another?"* then tumour TP53 (somatic) status is one plausible part of that answer.

It is not the only variable, but it is an important one.

### Best next step when reviewing a report

Check:

1. whether the result is from a **tumour/somatic** report
2. whether a TP53 variant code is listed
3. whether pathology suggests **p53 null** or aberrant staining

Then use [TP53 Mutation Types Reference](/myhealingcommunity-docs/testing-monitoring-and-biomarkers/tp53-in-cancer/somatic-tp53/tp53-mutation-types-reference.md) to sort the mutation bucket.\
Visit and bookmark: [helpful questions and prompts when receiving TP53 test results](/myhealingcommunity-docs/testing-monitoring-and-biomarkers/tp53-in-cancer/questions-for-oncologists.md)

### Bottom line

Fenbendazole appears most favourable, mechanistically, when the tumour still has functioning p53.

If the tumour p53 is mutant or null, the p53-dependent pathway is weakened. That does not negate all other Fenben anti-cancer mechanisms, but it does make the biology less aligned.

### Key references

Dogra et al. Scientific Reports fenbendazole study\
<https://pmc.ncbi.nlm.nih.gov/articles/PMC6085345/>

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This information is for education only. It is not medical advice, diagnosis, or treatment. Please speak with a qualified clinician before making changes to care, medication, or supplement use.
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