TL;DR
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A Norwegian research team reports that children with cancer were more likely to have antibodies targeting proteins involved in DNA repair. In a small group whose samples were collected before diagnosis, children who later developed cancer were about eight times more likely to have at least one such antibody; experiments also found the antibodies could enter cells. The findings suggest a possible mechanism, but do not establish that the antibodies cause cancer or support routine screening.
Researchers in Norway have reported that children with cancer were more likely to have antibodies targeting DNA repair proteins, and that laboratory experiments found the antibodies can enter cells. In a separate, small set of samples collected before diagnosis, children who later developed cancer were about eight times more likely to have at least one of the antibodies than peers who did not, raising the possibility of an autoimmune contribution to cancer development without proving cause and effect.
The team analyzed tumor and blood samples from 175 adults and children with sarcoma or acute lymphoblastic leukemia. Samples, collected between 2014 and 2017, came through Norwegian cancer studies and biobanks. Researchers compared the results with samples from healthy people, including blood donors and children in study or clinic cohorts. Children aged 2 to 19 with cancer had higher levels of IgG antibodies against DNA repair proteins than young adults and older people.
The antibodies mainly targeted RAD52, NUMA1, ALKBH7, APBB1, UNG and MGMT, proteins involved in DNA repair. The report says these proteins were not significantly mutated in the cancers studied. That observation led the researchers to investigate whether antibodies might affect the proteins directly, rather than the cancers arising from mutations in the targeted genes.
In follow-up tests, the team found that the antibodies could enter living cells, particularly as cells prepared to divide, and appear to bind their targets in an area known as the TIGER domain. The authors propose that this binding could immobilize or inhibit DNA repair proteins. The experiments offer a possible mechanism, but the study does not show that antibody binding caused the cancers in the patients.
A Possible Early Clue in Blood
The findings point to a potential way to study cancer risk before a tumor is diagnosed. In the pre-diagnosis sample group, antibodies were detectable on average about six years before cancer was diagnosed. If larger studies confirm the association and establish how predictive the antibodies are, they could help researchers understand which children may need closer monitoring.
That possibility is not the same as a screening recommendation. The study’s pre-diagnosis comparison included only 59 school-age children, half of whom later developed cancer before age 30. The reported eightfold difference describes the likelihood of finding at least one antibody in that selected group; it does not establish the absolute risk for a child with antibodies, or show that testing would prevent cancer. The authors’ suggestion of future screening remains a research prospect.
The work also offers a potential explanation for how cancer might develop when the usual accumulation of mutations is less pronounced. If antibodies interfere with proteins that repair DNA, damaged genetic material could persist. That is a proposed biological pathway, not a demonstrated cause of childhood cancer.
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How the Study Tested the Link
Childhood cancers differ in several ways from cancers diagnosed in adults. Children have had less time to accumulate DNA damage from aging and environmental exposures, and pediatric tumors often carry fewer mutations and arise in less mature cells. The researchers investigated whether an immune response against normal proteins could be one additional factor in some cases.
The study, published in Frontiers in Immunology, combined analysis of cancer and comparison samples with tests of whether the antibodies could enter cells. To explore timing, the researchers also examined stored samples from two long-running British child health studies, the Avon Longitudinal Study of Parents and Children and Born in Bradford. The samples were collected years before some participants developed cancer.
Corresponding author Ola Myklebost, an emeritus professor of molecular oncology at the University of Bergen, said the team found antibodies to DNA repair proteins in many children with different cancer types. The report describes the work as evidence for a previously unrecognized possible mechanism, rather than proof that one mechanism explains pediatric cancer broadly.
“We showed that many children with various types of cancer have antibodies against some of their own DNA repair proteins.”
— Ola Myklebost, study corresponding author and emeritus professor of molecular oncology at the University of Bergen
Cause and Screening Remain Unproven
The study does not establish that the antibodies caused cancer, how often they occur among children who never develop cancer, or whether they can reliably predict an individual child’s risk. The pre-diagnosis analysis was small, and the reported comparison does not provide an absolute risk estimate or establish how the result would perform in a general population.
It is also unclear what triggers the antibody response. Infection, immune cross-reaction and disrupted immune tolerance are possibilities raised by the researchers, not findings confirmed by the study. The cell experiments suggest the antibodies can enter cells and bind targets, but the extent to which this changes DNA repair in living people remains to be established. The researchers also have not shown that testing or acting on the antibody results would prevent cancer or improve outcomes.
Testing Antibody Effects Further
The research team said it is investigating how patient antibodies affect DNA repair. Further work will need to test the proposed mechanism and examine larger groups with samples collected before diagnosis, including children who do not develop cancer. Such studies could clarify whether the antibodies are a cause, a marker of another process, or both in some cases.
Any assessment of screening would also require evidence that a test can accurately identify risk and that follow-up offers a clear benefit. For now, the report describes an early research finding, not a validated screening test or a change to clinical practice.
Key Questions
What did the researchers find?
The team reported higher levels of antibodies against several DNA repair proteins in children with cancer than in comparison groups. Laboratory tests found that the antibodies could enter cells and appear to bind their targets.
Does the study prove that the antibodies cause childhood cancer?
No. The findings show an association and suggest a possible mechanism, but do not establish that the antibodies caused cancer. The effects of the antibodies on DNA repair in people remain under investigation.
What does the eightfold result mean?
In a selected group of 59 children with stored samples, those who later developed cancer were about eight times more likely than peers who did not to have antibodies to at least one core DNA repair protein. The group was small, and this result does not tell families the absolute cancer risk associated with a positive test.
Could this lead to screening children?
The researchers said the findings raise the possibility of future screening research. They do not establish that an antibody test is accurate or useful for routine care, and the study does not recommend screening children.
Source: rss
