Tumor Genetics Can Reveal Hidden Inherited Cancer Risk
Cancer patients and their relatives may benefit from genetic counseling, since standard testing can miss hereditary risk.
Updated on Nov. 6, 2026 in Cancer
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Should doctors routinely test cancer patients' tumors for inherited risks to their families?
Researchers analyzing tumors from 2,674 patients with solid cancers found that about 10 percent carried inherited genetic alterations linked to increased cancer risk, suggesting standard diagnostic pathways may miss hereditary cancer-predisposition syndromes. The findings, published in Genome Medicine, are relevant to cancer patients and their relatives who may be considered for further genetic testing.
Why it matters
Identifying an inherited cancer risk can change how a patient is monitored and treated, and it can also prompt testing of relatives who may share the same genetic change. The study suggests that tumor-based genomic analysis could help catch hereditary risks that routine testing overlooks, which matters for prevention and early detection across families.
This is a genomic analysis of tumor samples from 2,674 patients with solid cancers, using sequencing of more than 500 genes and germline confirmation. Roughly 10 percent carried inherited cancer-associated variants, and researchers estimated standard diagnostic pathways could miss about one-third of patients with hereditary syndromes; how these estimates translate into clinical outcomes remains unresolved.
The players
Fondazione Policlinico Universitario A. Gemelli IRCCS
A major Rome-based hospital and research institution that runs the FPG500 program studying genomic profiles of cancer patients.
Genome Medicine
A peer-reviewed journal that publishes research on genomics and its application to human health and disease.
PATHORA Institute
A German research institute where one of the study's researchers, Adler, is based, focused on pathology and cancer research.
The details
Researchers used next-generation sequencing to examine more than 500 genes in tumor samples, looking not only for acquired changes driving the tumor but also for alterations suspected to be constitutional, or germline, meaning inherited and present in every cell of the body. When a tumor carries a germline variant, it can signal a predisposition that predates the cancer itself. Confirming such a variant through germline testing allows clinicians to identify whether relatives may share the same genetic risk.
Timeline
The program analyzed approximately 2,700 samples from January 2022 to December 2023.
The FPG500 program at Fondazione Policlinico Universitario A. Gemelli IRCCS was launched in 2022.
Health Landscape
Genetic testing has increasingly moved from a narrow tool for suspected hereditary cases toward broader tumor profiling, and this study fits that shift by showing hereditary signals appearing in tumors from many cancer types. The FPG500 program's analysis of roughly 2,700 samples offers a large-scale view of how often such inherited risks surface in routine oncology populations.
If you have a personal or family history of cancer, it is worth asking your oncologist or primary care doctor whether genetic counseling or germline testing is appropriate, since a tumor analysis alone may not reveal every inherited risk. Relatives of anyone found to carry a hereditary variant may also want to discuss their own screening options with a clinician.
The takeaway
Inherited cancer risks can hide in tumor genetics and may be missed by standard diagnostic routes, so a family history of cancer is worth raising with your doctor. Ask whether genetic counseling is appropriate, especially if relatives have been diagnosed with cancer at a young age or with multiple related cancers.
Further reading
For broader context on how tumor testing is changing diagnosis, explore our Cancer coverage.
More information
Read the original Genome Medicine study on germline variant identification for the full methods and results.
Source note: This article includes information reported by Newsweek.
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Should doctors routinely test cancer patients' tumors for inherited risks to their families?
