GTR Home > Conditions/Phenotypes > Peutz-Jeghers syndrome

Summary

Excerpted from the GeneReview: Peutz-Jeghers Syndrome
Peutz-Jeghers syndrome (PJS) is an autosomal dominant condition characterized by the association of gastrointestinal polyposis, mucocutaneous pigmentation, and cancer predisposition. Peutz-Jeghers-type hamartomatous polyps are most common in the small intestine (in order of prevalence: in the jejunum, ileum, and duodenum) but can also occur in the stomach, large bowel, and extraintestinal sites including the renal pelvis, bronchus, gall bladder, nasal passages, urinary bladder, and ureters. Gastrointestinal polyps can result in chronic bleeding and anemia and also cause recurrent obstruction and intussusception requiring repeated laparotomy and bowel resection. Mucocutaneous hyperpigmentation presents in childhood as dark blue to dark brown macules around the mouth, eyes, and nostrils, in the perianal area, and on the buccal mucosa. Hyperpigmented macules on the fingers are common. The macules may fade in puberty and adulthood. Individuals with Peutz-Jeghers syndrome are at increased risk for a wide variety of epithelial malignancies (colorectal, gastric, pancreatic, breast, and ovarian cancers). Females are at risk for sex cord tumors with annular tubules (SCTAT), a benign neoplasm of the ovaries, and adenoma malignum of the cervix, a rare aggressive cancer. Males occasionally develop large calcifying Sertoli cell tumors (LCST) of the testes, which secrete estrogen and can lead to gynecomastia, advanced skeletal age, and ultimately short stature, if untreated.

Genes See tests for all associated and related genes

  • Also known as: LKB1, PJS, hLKB1, STK11
    Summary: serine/threonine kinase 11

Clinical features

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Practice guidelines

  • ACMG, 2016
    Recommendations for reporting of secondary findings in clinical exome and genome sequencing, 2016 update (ACMG SF v2.0): a policy statement of the American College of Medical Genetics and Genomics.
  • ACG, 2015
    ACG clinical guideline: Genetic testing and management of hereditary gastrointestinal cancer syndromes.
  • ACMG, 2015
    ACMG policy statement: updated recommendations regarding analysis and reporting of secondary findings in clinical genome-scale sequencing.
  • ACMG/NSGC, 2015
    A practice guideline from the American College of Medical Genetics and Genomics and the National Society of Genetic Counselors: referral indications for cancer predisposition assessment.
  • ACMG, 2013
    ACMG recommendations for reporting of incidental findings in clinical exome and genome sequencing.
  • CAPS, 2013
    International Cancer of the Pancreas Screening (CAPS) Consortium summit on the management of patients with increased risk for familial pancreatic cancer
  • NSGC, 2004
    Genetic cancer risk assessment and counseling: recommendations of the National Society of Genetic Counselors.

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