Autoantibodies: A Potential Key in Pediatric Cancer Diagnosis

Researchers believe they have identified a previously unknown cause of pediatric cancer, potentially enabling earlier detection in children. A team at the University of Bergen in Norway found autoantibodies in children with cancer targeting proteins needed for DNA repair. These antibodies were also present years before diagnosis. The findings were published in Frontiers in Immunology on October 14.

Childhood Cancer Overview

Childhood cancer is rare. Common types include blood cancers like leukemia and lymphoma, and tumors of the brain, spinal cord, and bone. This differs from adult cancers, which often affect the lungs, breast, colon, prostate, and skin.

Understanding Autoantibodies

Unlike antibodies that protect the body, autoantibodies mistakenly target healthy tissue, potentially causing autoimmune diseases such as type 1 diabetes, lupus, and multiple sclerosis. The exact trigger for autoantibody production is not clearly understood, though factors like infections, environmental toxins, or genetics might play a role.

Study Insights

Between 2014 and 2017, researchers examined samples from 175 people with sarcoma or acute lymphoblastic leukemia. These included children and adults from various Norwegian programs and hospitals. By comparing these with healthy individuals, researchers found that children aged 2-19 with cancer had significantly higher IgG class antibodies. These antibodies target genes like RAD52, NUMA1, and MGMT involved in DNA repair.

Ola Myklebost, a molecular oncology professor and study author, highlighted that autoantibodies can enter cells and bind proteins outside the nucleus, disrupting repair activity. This increases mutation rates and cancer risk, with such autoantibodies being found eight times more frequently in children who later developed cancer.

Dr. Yvonne Saenger from Stony Brook University noted the importance of further research to understand how these antibodies impact cellular processes.

Implications of the Findings

Myklebost described this as a new hypothesis on cancer origins, potentially applicable to young adults and occasionally adults too. Establishing causality and understanding autoantibody patterns could allow for screening children to assess cancer risk, and possibly targeting or inhibiting the cells producing these antibodies.

Anastassia Serguienko, another study author, emphasized the need for future biomedical research on penetrating autoantibodies and their mechanisms.