| Interpretive Data: |
Background Information for PTEN-Related Disorders (PTEN) Sequencing:
Characteristics of PTEN hamartoma tumor syndrome (PHTS): Clinical findings are highly variable and include Cowden syndrome (CS), Bannayan-Riley-Ruvalcaba syndrome (BRRS), Proteus syndrome (PS) and Proteus-like syndrome (PSL).
CS: Multiple hamartoma syndrome with increased risk for malignant and benign tumors of the breast, thyroid and endometrium. Other associated findings include macrocephaly and mucocutaneous lesions (facial trichilemmomas, palmoplantar keratoses and papillomatous papules).
BRRS: Characterized by macrocephaly, intestinal hamartomatous polyposis, lipomas, hemangiomas and pigmented macules of the glans penis.
PS: A progressive disorder demonstrating mosaic distribution of associated lesions. Findings include hamartomatous tissue overgrowth, hyperostoses, connective tissue and epidermal nevi, dysregulated adipose tissue, vascular malformations and other congenital malformations.
PSL: Describes individuals with significant features of PS who do not meet clinical diagnostic criteria for PS.
Incidence: At least 1 in 200,000 for CS; PS is rare with approximately 120 reported cases; unknown for other PTEN-associated conditions.
Inheritance: Autosomal dominant. All mutations causing PS and 50-90 percent causing CS are de novo.
Penetrance: 99 percent by 30 years of age for CS.
Cause: Pathogenic PTEN gene mutations.
Clinical Sensitivity: 80 percent for CS, 60 percent for BRRS, 50 percent for PSL and 20 percent for PS.
Methodology: Bidirectional sequencing of the PTEN promoter, coding region and intron-exon boundaries.
Analytical Sensitivity and Specificity: 99 percent.
Limitations: Rare diagnostic errors can occur due to primer site mutations. Some regulatory region mutations, deep intronic mutations, and large deletion/duplications will not be detected.
Counseling and informed consent are recommended for genetic testing. Consent forms are available online at www.aruplab.com.
Refer to Statement C under Testing Information at http://www.aruplab.com.
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| CPT Code(s): |
83891 Isolation; 83898 x12 Amplification; 83904 x12 Sequencing; 83909 Capillary electrophoresis, 83912 Interpretation and report. Additional CPT code modifiers may be required for procedures performed to test for oncologic or inherited disorders.
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Cross References: |
Bannayan-Riley-Ruvalcaba Syndrome (PTEN-Related Disorders (PTEN) Sequencing)
, Cowden Syndrome (PTEN-Related Disorders (PTEN) Sequencing)
, Proteus Syndrome (PTEN-Related Disorders (PTEN) Sequencing)
, Proteus-Like Syndrome (PTEN-Related Disorders (PTEN) Sequencing)
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