A new drug worked in mice with tumors that lost a repair gene
Original title: Targeting O6-methylguanine-DNA Methyltransferase Deficiency in Preclinical Models of Extracranial Human Cancers with a Tumor-Selective DNA-Modifying Agent.
How far along is this research?
- Lab cells
- Animals
- Review
- Tested in people
This was done in animals, not people. Most findings at this stage never become treatments.
This was only done in lab cells and in mice.
The short version
An early drug shrank tumors in mice, but it has not been tried in people.
What was studied. Scientists tested a new drug called KL-50 on human cancer cells grown in a lab. They also tested it in mice that carried human tumors, including tumors taken from real patients.
What they found. KL-50 worked well against many tumors that had lost a repair gene called MGMT promoter methylation: MGMT is a gene whose protein repairs damage to a tumor's DNA. Methylation turns it down. Your report says how much, and your team uses that when they choose chemotherapy. The line between high and low is not settled. See the glossary. This included colon cancer, melanoma, and lung cancer in mice. It still worked in tumors that had stopped responding to temozolomide: A chemotherapy taken as a capsule, used for some brain tumors. Your team checks your blood counts while you are on it. See the glossary. It also caused less harm to the rest of the body than similar older drugs.
What this means, and what it doesn't
What it could mean: Some brain tumors also lose the MGMT promoter methylation: MGMT is a gene whose protein repairs damage to a tumor's DNA. Methylation turns it down. Your report says how much, and your team uses that when they choose chemotherapy. The line between high and low is not settled. See the glossary gene. temozolomide: A chemotherapy taken as a capsule, used for some brain tumors. Your team checks your blood counts while you are on it. See the glossary is used for those tumors, but it can stop working over time. This drug is being built to keep working when that happens. Right now it is only an early idea for the future.
What it doesn't mean: This does not mean there is a new treatment today. The work was done in lab dishes and in mice, not in people. Many drugs that work in mice do not work in people. No patient can get this drug now, and it is not a cure.
Source: PubMed, September 25, 2026 · Read the original
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