Rare Dermatology News

Disease Profile

Turcot syndrome

Prevalence
Prevalence estimates on Rare Medical Network websites are calculated based on data available from numerous sources, including US and European government statistics, the NIH, Orphanet, and published epidemiologic studies. Rare disease population data is recognized to be highly variable, and based on a wide variety of source data and methodologies, so the prevalence data on this site should be assumed to be estimated and cannot be considered to be absolutely correct.

Unknown

Age of onset

#N/A

ICD-10

#N/A

Inheritance

Autosomal dominant A pathogenic variant in only one gene copy in each cell is sufficient to cause an autosomal dominant disease

no.svg

Autosomal recessive Pathogenic variants in both copies of each gene of the chromosome are needed to cause an autosomal recessive disease and observe the mutant phenotype

no.svg

X-linked
dominant X-linked dominant inheritance, sometimes referred to as X-linked dominance, is a mode of genetic inheritance by which a dominant gene is carried on the X chromosome.

no.svg

X-linked
recessive Pathogenic variants in both copies of a gene on the X chromosome cause an X-linked recessive disorder

no.svg

Mitochondrial or multigenic Mitochondrial genetic disorders can be caused by changes (mutations) in either the mitochondrial DNA or nuclear DNA that lead to dysfunction of the mitochondria and inadequate production of energy.

no.svg

Multigenic or multifactor Inheritance involving many factors, of which at least one is genetic but none is of overwhelming importance, as in the causation of a disease by multiple genetic and environmental factors.

no.svg

Not applicable

no.svg

Other names (AKA)

Malignant tumors of the central nervous system associated with familial polyposis of the colon; CNS tumors with Familial polyposis of the colon; Mismatch Repair Cancer Syndrome;

Categories

Rare Cancers

Summary

Turcot syndrome is a condition characterized by multiple adenomatous colon polyps, an increased risk of colorectal cancer, and an increased risk of brain cancer. It may be associated with familial adenomatous polyposis (FAP) or Lynch syndrome (also known as hereditary non-polyposis colorectal cancer or HNPCC). The molecular basis of most Turcot syndrome is either a mutation in APC associated with FAP or a mutation in one of the mismatch repair genes associated with Lynch syndrome (MLH1 and PMS2). The brain tumors in individuals with APC mutations are typically medulloblastoma, whereas those with mismatch repair mutations are usually glioblastoma multiforme.[1][2] Turcot syndrome typically follows an autosomal dominant inheritance pattern.[1]

Symptoms

This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.

Medical Terms Other Names
Learn More:
HPO ID
5%-29% of people have these symptoms
Agenesis of corpus callosum
0001274
Gray matter heterotopia
0002282
Percent of people who have these symptoms is not available through HPO
Abnormal abdomen morphology
Abnormality of abdomen structure
0001438
Astrocytoma
0009592
Autosomal recessive inheritance
0000007
Axillary freckling
0000997
Basal cell carcinoma
0002671
Cafe-au-lait spot
0000957
Ependymoma
0002888
Glioblastoma multiforme
0012174
Hypermelanotic macule
Hyperpigmented spots
0001034
Leukemia
0001909
Lymphoma
Cancer of lymphatic system
0002665
Medulloblastoma
0002885
Neuroblastoma
Cancer of early nerve cells
0003006
Rhabdomyosarcoma
0002859

Diagnosis

Making a diagnosis for a genetic or rare disease can often be challenging. Healthcare professionals typically look at a person’s medical history, symptoms, physical exam, and laboratory test results in order to make a diagnosis. The following resources provide information relating to diagnosis and testing for this condition. If you have questions about getting a diagnosis, you should contact a healthcare professional.

Testing Resources

  • The Genetic Testing Registry (GTR) provides information about the genetic tests for this condition. The intended audience for the GTR is health care providers and researchers. Patients and consumers with specific questions about a genetic test should contact a health care provider or a genetics professional.
  • Orphanet lists international laboratories offering diagnostic testing for this condition.

    Organizations

    Support and advocacy groups can help you connect with other patients and families, and they can provide valuable services. Many develop patient-centered information and are the driving force behind research for better treatments and possible cures. They can direct you to research, resources, and services. Many organizations also have experts who serve as medical advisors or provide lists of doctors/clinics. Visit the group’s website or contact them to learn about the services they offer. Inclusion on this list is not an endorsement by GARD.

    Organizations Supporting this Disease

      Organizations Providing General Support

        Learn more

        These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.

        Where to Start

        • The National Organization for Rare Disorders (NORD) has a report for patients and families about this condition. NORD is a patient advocacy organization for individuals with rare diseases and the organizations that serve them.
        • The American Society of Clinical Oncology provides oncologist-approved information on cancer-related topics. Click on the link to view information about Turcot syndrome.

          In-Depth Information

          • GeneReviews provides current, expert-authored, peer-reviewed, full-text articles describing the application of genetic testing to the diagnosis, management, and genetic counseling of patients with specific inherited conditions.
          • The Monarch Initiative brings together data about this condition from humans and other species to help physicians and biomedical researchers. Monarch’s tools are designed to make it easier to compare the signs and symptoms (phenotypes) of different diseases and discover common features. This initiative is a collaboration between several academic institutions across the world and is funded by the National Institutes of Health. Visit the website to explore the biology of this condition.
          • Online Mendelian Inheritance in Man (OMIM) is a catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
          • PubMed is a searchable database of medical literature and lists journal articles that discuss Turcot syndrome. Click on the link to view a sample search on this topic.

            References

            1. Turcot Syndrome. Cancer.Net. 2011; https://www.cancer.net/cancer-types/turcot-syndrome. Accessed 8/28/2012.
            2. Jasperson KW, Burt RW. APC-Associated Polyposis Conditions. GeneReviews. March 27, 2014; https://www.ncbi.nlm.nih.gov/books/NBK1345/. Accessed 6/23/2014.