Platinum Chemotherapy Found to Cause Large DNA Damage in Children's Healthy Tissues

Overview

• A paper published in Science on 10 September 2026 used high-resolution NanoSeq to analyze 186 samples from nine children treated with platinum drugs and found mutation levels in healthy cells that match decades of normal ageing.
• The team identified a distinct platinum-associated mutational signature confined to the liver, which the authors link to the organ's role in breaking down the drugs.
• Some chemotherapy-induced changes match known cancer-driver mutations, but the authors stress that secondary cancers after childhood treatment remain uncommon and that chemotherapy is lifesaving.
• NanoSeq sequences both DNA strands to detect low-frequency mutations that standard bulk methods miss, enabling the mapping of treatment-related DNA footprints across tissues.
• Because the study is small and focused on children treated for liver cancer, the authors call for larger, long-term studies and research into protective strategies to reduce late health risks for survivors.