NewsResearch
First Prime Editing Inside the Body: What a Wilson's Disease Trial Means for Cancer Research
Nature reports the first known use of prime editing to change DNA inside a person's body, in a trial for Wilson's disease. It is not a cancer treatment. Here is what it is, what it is not, and why cancer researchers watch it.
Original commentary from the Cancer Explained editorial team.
Review status: AI-assisted, source checked. Not reviewed by a clinician. How we check pages
Sources last checked .
Please note: this page is educational only — it is not medical advice, and it does not speculate about anyone’s health beyond reliable public reporting. For questions about your own health, talk with your healthcare team.
What is new
The journal Nature reports what it calls the first known case of gene editing done directly inside a person's body with a method called prime editing.
It is part of a clinical trial for Wilson's disease. This is an inherited condition, not a cancer. In Wilson's disease, the liver cannot clear extra copper. Over time the copper builds up and can damage the liver and nerves.
Prime Medicine, the company running the trial, said it had treated its first participant earlier in October 2026. Nature says the company expects to report first results next year.
Why a cancer site is covering it
This is not a cancer treatment. We are covering it because readers ask about gene editing in the news, and because the same tools are being studied in cancer. It helps to know what this news does and does not mean.
What prime editing is
Gene editing means changing the DNA in a cell. The best-known tool is CRISPR-Cas9. Nature explains that CRISPR-Cas9 is often used to switch genes off, not to rewrite them.
Prime editing is a newer method. Nature describes it as able to insert, delete and rewrite stretches of DNA with more precision than standard CRISPR-Cas9. In this trial, it aims to correct a single harmful change in a gene called ATP7B that causes Wilson's disease. The target is liver cells.
Why "inside the body" is a big step
Most gene-edited therapies today are made outside the body. Doctors take a person's cells, edit them in a lab, and give them back. Nature notes that editing in the body, called in vivo editing, could be cheaper and faster than making a custom treatment from each person's own cells.
Nature also says that no in vivo gene-editing therapy is approved so far. It adds that the US Food and Drug Administration is expected to decide early next year on one in vivo CRISPR-Cas9 therapy for a different condition, hereditary angioedema.
What the trial is, and what it is not
The trial is registered as NCT07748403. ClinicalTrials.gov lists it as a Phase 1/2 study. Those early phases mainly test safety and look for first signs that a treatment works. The record lists it as recruiting, with estimated completion dates in 2028.
This means:
- No results yet. We do not know whether the treatment works or how safe it is. One person has been treated, as far as the sources say.
- It is a company trial. The first announcement came from the company.
- It is for a specific mutation in Wilson's disease. It does not apply to other conditions, including cancers.
- It is not available outside the trial.
What it has to do with cancer
Gene editing is already being tested in cancer, mostly outside the body. The National Cancer Institute described one early trial in which patients' own immune cells, called T cells, were changed in the lab so they could better find and attack cancer. CRISPR was used to remove three genes from those cells. The cells were then given back to the patients.
Doing gene editing inside the body is a different and harder approach. It would need the editing tool to reach the right cells and not the wrong ones. Nature quotes one researcher saying that in vivo approaches have their own challenges and that the choice depends on which risks you are willing to accept.
So this news is a sign of where the field is going. It is not a sign that gene editing is ready to treat cancer.
What this does not mean
- It does not mean gene editing is a proven treatment for cancer. This trial is not about cancer.
- It does not mean the Wilson's disease treatment works. The results are not out.
- It does not change what you should do today. Treatment choices stay with you and your care team.
Questions to ask your care team
- Is there a gene change in my cancer or in my family that matters for my treatment? (See genetic testing for cancer risk.)
- Could a clinical trial be right for me? How do I find out? (See what clinical trials are.)
- When I read news about a new treatment, how can I tell whether it has been tested in people with my kind of cancer?
What this story cannot tell you
We read Nature's report, but part of the article is behind a login, so we used the open text. We also read the company's announcement through a reprint, the trial record, and NCI's page on CRISPR in cancer research. We did not see any trial data. The NCI page we used is from 2020, so it does not cover the latest cancer trials.
Sources
- Nature News, "A first for CRISPR: powerful prime editing alters DNA directly in the human body," Heidi Ledford, 22 October 2026: https://www.nature.com/articles/d41586-026-03371-x
- Prime Medicine, first patient dosed in Phase 1/2 trial of PM577a (company announcement, reprinted by Finviz): https://finviz.com/news/398593/prime-medicine-announces-first-patient-dosed-in-global-phase-12-clinical-trial-of-pm577a-for-h1069q-mutated-wilson-disease
- ClinicalTrials.gov, NCT07748403: https://clinicaltrials.gov/study/NCT07748403
- National Cancer Institute, "How CRISPR Is Changing Cancer Research and Treatment": https://www.cancer.gov/news-events/cancer-currents-blog/2020/crispr-cancer-research-treatment
How this article was prepared
An AI-assisted editorial system helped prepare this page. No named medical reviewer has reviewed it unless one is listed.
See an error, old source, or unclear wording? Tell us.
Put the story in context
Prevention, possible warning signs, screening, and diagnosis
This story relates to Gene editing and cancer research. The information below is general, and not every point applies to every cancer. Personal advice depends on age, symptoms, family history, exposures, and medical history.
Prevention and risk reduction
Not every cancer can be prevented. Avoiding tobacco, protecting skin from ultraviolet radiation, limiting alcohol, staying active, and receiving recommended HPV or hepatitis B vaccination can lower the risk of certain cancers. A risk factor is not a prediction or a cause in one individual.
Symptoms and possible early signs
Possible signs vary and are often caused by conditions other than cancer. Changes worth discussing include a new lump, unexplained bleeding or weight loss, a persistent cough, lasting bowel or bladder changes, a changing skin spot, or symptoms that persist or worsen. Some early cancers cause no symptoms.
Screening and early detection
Screening looks for certain cancers before symptoms begin. Recommended tests exist only for some cancers and depend on age and risk. Screening can have benefits and harms; it is not the same as evaluating a new symptom, and there is no single routine scan or blood test that reliably screens for every cancer.
How cancer is diagnosed
Diagnosis may involve a history and exam, imaging, laboratory tests, and often a biopsy. Pathology can identify the cancer type and may test biomarkers that guide treatment. Symptoms, screening results, tumor markers, or online stories alone cannot confirm cancer.
A news story may encourage questions, but it should not be used to estimate your risk or choose testing. Contact a healthcare professional about a persistent or concerning change. Seek urgent care for severe or rapidly worsening symptoms.