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Test ID: PTENZ PTEN Gene, Full Gene Analysis, Varies

Useful For

Confirming a diagnosis of PTEN hamartoma tumor syndrome, which includes Cowden syndrome, Bannayan-Riley-Ruvalcaba syndrome, Proteus syndrome, or Proteus-like syndrome

 

Identifying variants in the PTEN gene

Additional Tests

Test ID Reporting Name Available Separately Always Performed
COLAB Hereditary Colon Cancer CGH Array Yes, (order FMTT) Yes

Testing Algorithm

When this test is ordered, comparative genomic hybridization array will always be performed at an additional charge.

 

See Colonic Polyposis Syndromes Testing Algorithm in Special Instructions.

Method Name

Polymerase Chain Reaction (PCR) Amplification/DNA Sequencing

 

COLAB: Array comparative genomic hybridization (aCGH)

Reporting Name

PTEN Gene, Full Gene Analysis

Specimen Type

Varies


Shipping Instructions


Specimen preferred to arrive within 96 hours of collection.



Specimen Required


Patient Preparation: A previous bone marrow transplant from an allogenic donor will interfere with testing. Call 800-533-1710 for instructions for testing patients who have received a bone marrow transplant.

Specimen Type: Whole blood

Container/Tube:

Preferred: Lavender top (EDTA) or yellow top (ACD)

Acceptable: Any anticoagulant

Specimen Volume: 3 mL

Collection Instructions:

1. Invert several times to mix blood.

2. Send specimen in original tube.


Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Varies Ambient (preferred)
  Frozen 
  Refrigerated 

Clinical Information

Germline variants in the PTEN gene are associated with a rare collection of clinical syndromes referred to as PTEN hamartoma tumor syndrome (PHTS). This includes Cowden syndrome (CS), Bannayan-Riley-Ruvalcaba syndrome (BRRS), Proteus syndrome (PS) and Proteus-like syndrome (PLS). Although each of these syndromes has its own unique features, all 4 appear to be associated with multiple hamartomatous lesions, vascular lesions, and macrocephaly. Affected individuals have an increased risk of cancer, including cancers of the breast, endometrium, thyroid, colon, and kidney. PHTS is an autosomal dominant disorder and penetrance is believed to be quite high.

 

CS is a multiple hamartoma syndrome associated with trichilemmomas, mucocutaneous papillomatous papules, and macrocephaly. Affected individuals are at an increased risk for breast, thyroid, and endometrial carcinoma.

 

BRRS is characterized by macrocephaly, intestinal hamartomas, lipomatosis, hemangiomatosis, and pigmented macules on the glans penis.

 

PS is associated with congenital malformations, overgrowth, macrocephaly, hyperostosis, connective tissue nevi, and epidermal nevi.

 

PLS refers to individuals who have features of PS, but do not meet diagnostic criteria.

Reference Values

An interpretive report will be provided.

Interpretation

All detected alterations are evaluated according to American College of Medical Genetics and Genomics (ACMG) recommendations.(1) Variants are classified based on known, predicted, or possible pathogenicity and reported with interpretive comments detailing their potential or known significance.

Clinical Reference

1. Richards S, Aziz N, Bale S, et al: Standards and guidelines for the interpretation of sequence variants: a joint consensus recommendation of the American College of Medical Genetics and Genomics and the Association for Molecular Pathology. Genet Med. 2015 May;17(5):405-424

2. Eng C: PTEN hamartoma tumor syndrome. In: Adam MP, Ardinger HH, Pagon RA, et al, eds. GeneReviews (Internet). University of Washington, Seattle; 2001. Updated June 2, 2016. Accessed August 12, 2020 Available at www.ncbi.nlm.nih.gov/books/NBK1488/

3. Pilarski R, Stephens JA, Noss R, Fisher JL, Prior TW: Predicting PTEN mutations: an evaluation of Cowden syndrome and Bannayan-Riley-Ruvalcaba syndrome clinical features. J Med Genet. 2011 Aug;48(8):505-512

4. Zhou XP, Waite KA, Pilarski R, et al: Germline PTEN promoter mutations and deletions in Cowden/Bannayan-Riley-Ruvalcaba syndrome result in aberrant PTEN protein and dysregulation of the phosphoinositol-3-kinase/Akt pathway. Am J Hum Genet. 2003 Aug;73(2):404-411

5. Tan MH, Mester J, Peterson C, et al: A clinical scoring system for selection of patients for PTEN mutation testing is proposed on the basis of a prospective study of 3042 probands. Am J Hum Genet. 2011 Jan 7;88(1):42-56

Day(s) Performed

Performed weekly

Report Available

14 to 20 days

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Code Information

81321

 

Hereditary Colon Cancer CGH Array, additional test

81228

LOINC Code Information

Test ID Test Order Name Order LOINC Value
PTENZ PTEN Gene, Full Gene Analysis 94223-5

 

Result ID Test Result Name Result LOINC Value
52520 Result Summary 50397-9
52521 Result 82939-0
52522 Interpretation 69047-9
52523 Additional Information 48767-8
52524 Specimen 31208-2
52525 Source 31208-2
52526 Array Billed? No LOINC Needed
52527 Released By 18771-6

Forms

1. New York Clients-Informed consent is required. Document on the request form or electronic order that a copy is on file. The following documents are available in Special Instructions:

-Informed Consent for Genetic Testing (T576)

-Informed Consent for Genetic Testing-Spanish (T826)

2. Molecular Genetics: Inherited Cancer Syndromes Patient Information (T519) in Special Instructions

3. If not ordering electronically, complete, print, and send a Gastroenterology and Hepatology Client Test Request (T728) with the specimen.

Mayo Clinic Laboratories | Genetics and Pharmacogenomics Catalog Additional Information:

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