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Some childhood cancers are deadlier than they look. Scientists have discovered hidden populations of aggressive cancer cells lurking inside rhabdomyosarcoma tumors previously classified as lower risk — helping explain why some children face devastating outcomes despite reassuring genetic test results. The findings, published in Cancer Research, could pave the way for earlier detection and more personalized treatment.
Some childhood cancers are deadlier than they look. Scientists from the Wellcome Sanger Institute, University of Cambridge, and Great Ormond Street Hospital have found that certain rhabdomyosarcoma (RMS) tumors — a common soft tissue cancer in children — classified as "lower risk" actually harbor hidden populations of highly aggressive cancer cells. Using single-cell RNA sequencing and spatial transcriptomics, researchers discovered that these cells share gene activity patterns nearly identical to those in high-risk tumors, even without the genetic fusion marker traditionally used to flag danger.
The twist? Different genetic mutations can push cancer cells toward the same aggressive biological state — meaning the current classification system may be missing children who urgently need intensive treatment.
Key Takeaways:
Why it matters: Approximately 55 children are diagnosed with RMS in the UK each year. Better risk stratification could save lives by ensuring the right children get the right treatment intensity from the start.
