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Test Code LYNCP Lynch Syndrome Panel, Varies


Ordering Guidance


This gene panel tests for germline variants in the Lynch syndrome genes. This is not a tumor test or immunohistochemistry (IHC). For information on tumor testing or IHC staining for Lynch syndrome, see TMSI / Microsatellite Instability, Tumor or IHC / Mismatch Repair (MMR) Protein Immunohistochemistry Only, Tumor.

 

For a comprehensive hereditary cancer panel that includes MLH1, MSH2, MSH6, PMS2, and EPCAM genes, consider ordering 1 of the following tests:

-CRCGP / Hereditary Gastrointestinal Cancer Panel, Varies

-PANCP / Hereditary Pancreatic Cancer Panel, Varies

-PRS8P / Hereditary Prostate Cancer Panel, Varies

-BRGYP / Hereditary Breast/Gynecologic Cancer Panel, Varies

 

Customization of this panel and single gene analysis for any gene present on this panel are available. For more information see CGPH / Custom Gene Panel, Hereditary, Next-Generation Sequencing, Varies.

 

Targeted testing for familial variants (also called site-specific or known mutations testing) is available for the genes on this panel. For more information see FMTT / Familial Variant, Targeted Testing, Varies. To obtain more information about this testing option, call 800-533-1710.

 

Testing minors for adult-onset predisposition syndromes is discouraged by the American Academy of Pediatrics, the American College of Medical Genetics and Genomics, and the National Society of Genetic Counselors.



Shipping Instructions


Specimen preferred to arrive within 96 hours of collection.



Necessary Information


Prior Authorization is available, but not required, for this test. If proceeding with the prior authorization process, submit the required form with the specimen.



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 whole blood specimen in original tube. Do not aliquot.

Specimen Stability Information: Ambient (preferred) 4 days/Refrigerated


Forms

1. New York Clients-Informed consent is required. Document on the request form or electronic order that a copy is on file.

-Informed Consent for Genetic Testing (T576)

-Informed Consent for Genetic Testing (Spanish) (T826)

2. Molecular Genetics: Inherited Cancer Syndromes Patient Information Sheet (T519)

3. Lynch Syndrome Panel (LYNCP) Prior Authorization Ordering Instructions

4. If not ordering electronically, complete, print, and send a Oncology Test Request (T729)

Secondary ID

614572

Useful For

Establishing a diagnosis of Lynch syndrome or constitutional mismatch repair deficiency allowing for targeted cancer surveillance based on associated risks

 

Identifying MLH1, MSH2, MSH6, PMS2, or EPCAM variants to allow for predictive testing in family members

Disease States

  • Lynch syndrome

Testing Algorithm

First-tier testing may be considered/recommended. For more information see Lynch Syndrome Testing Algorithm.

Method Name

Sequence Capture and Next-Generation Sequencing (NGS), Polymerase Chain Reaction (PCR), Sanger Sequencing and/or Multiplex Ligation-Dependent Probe Amplification (MLPA)

Reporting Name

Lynch Syndrome Panel

Specimen Type

Varies

Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Varies Varies

Reject Due To

All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.

Clinical Information

The lifetime risk of colorectal cancer in the general population is 4% to 6%.(1) Lynch syndrome (also known as hereditary nonpolyposis colorectal cancer) is an autosomal dominant hereditary cancer syndrome accounting for 2% to 4% of all colorectal cancer cases.(2,3)

 

Lynch syndrome is associated with germline variants in the mismatch repair genes, MLH1, MSH2, MSH6, PMS2, or deletions of the EPCAM gene. It is predominantly characterized by significantly increased risks for colorectal and endometrial cancer.(2,3) The lifetime risk for cancer is highly variable and dependent on the gene involved. Other malignancies within the tumor spectrum include gastric, ovarian, and small bowel cancers and hepatobiliary and upper urinary tract carcinomas.(2,3)

 

Individuals with biallelic disease-causing variants in the same mismatch repair gene are at risk for constitutional mismatch repair deficiency, an autosomal recessive childhood-onset hereditary cancer syndrome.(3)

 

The National Comprehensive Cancer Network and the American Cancer Society provide recommendations regarding the medical management of individuals with Lynch syndrome.(2,4)

Reference Values

An interpretive report will be provided.

Interpretation

All detected variants are evaluated according to American College of Medical Genetics and Genomics recommendations.(5) Variants are classified based on known, predicted, or possible pathogenicity and reported with interpretive comments detailing their potential or known significance.

Method Description

Next-generation sequencing (NGS) and/or Sanger sequencing are performed to test for the presence of variants in coding regions and intron/exon boundaries of the genes analyzed, as well as some other regions that have known disease-causing variants. The human genome reference GRCh37/hg19 build was used for sequence read alignment. At least 99% of the bases are covered at a read depth over 30X. Sensitivity is estimated at above 99% for single nucleotide variants, above 94% for deletion-insertions (delins) less than 40 base pairs (bp), above 95% for deletions up to 75 bp and insertions up to 47 bp. NGS, multiplex ligation-dependent probe amplification (MLPA), and/or a polymerase chain reaction (PCR)-based quantitative method is performed to test for the presence of deletions and duplications in the genes analyzed. PCR and gel electrophoresis is performed to test for the presence of the 10 megabase inversion of coding exons 1-7 of the MSH2 gene.

 

There may be regions of genes that cannot be effectively evaluated by sequencing or deletion and duplication analysis as a result of technical limitations of the assay, including regions of homology, high guanine-cytosine (GC) content, and repetitive sequences. For details regarding the targeted genes analyzed or specific gene regions not routinely covered, see Targeted Genes and Methodology Details for Lynch Syndrome Panel.(Unpublished Mayo method)

 

Confirmation of select reportable variants may be performed by alternate methodologies based on internal laboratory criteria.

 

Genes analyzed: MLH1, MSH2, MSH6, PMS2, and EPCAM (copy number variants only)

Day(s) Performed

Varies

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

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

CPT Code Information

81319
81317
81403
81292
81295
81298
81479 (if appropriate for government payers)

LOINC Code Information

Test ID Test Order Name Order LOINC Value
LYNCP Lynch Syndrome Panel 105197-8

 

Result ID Test Result Name Result LOINC Value
614755 Test Description 62364-5
614756 Specimen 31208-2
614757 Source 31208-2
614758 Result Summary 50397-9
614759 Result 82939-0
614760 Interpretation 69047-9
614761 Resources 99622-3
614762 Additional Information 48767-8
614763 Method 85069-3
614764 Genes Analyzed 48018-6
614765 Disclaimer 62364-5
614766 Released By 18771-6

Prior Authorization

Insurance preauthorization is available for this testing; forms are available.

 

Patient financial assistance may be available to those who qualify. Patients who receive a bill from Mayo Clinic Laboratories will receive information on eligibility and how to apply.