Test Name: GCDFP-15


Methodology: IHC


Test Description

GCDFP-15 is a marker of apocrine differentiation, and is expressed in breast cystic fluid as well as in apocrine, lacrimal, ceruminous, Moll’s and eccrine glands. GCDFP-15 expression is found in neoplastic cells from primary and metastatic tumors of the breast. With the exception of carcinomas of the salivary gland, sweat gland and prostate, the majority of other neoplasms evaluated are GCDFP-15-negative. Antibodies to GCDFP-15 are useful for the identification of breast carcinoma and metastatic tumors of breast origin.


Specimen Requirements

A formalin-fixed, paraffin-embedded (FFPE) tissue block is preferred specimen type or one (1) unbaked, unstained slide cut at 4-5 microns for H&E staining (required) and two to three (2-3) positively charged unstained slides cut at 3-4 microns for each test/antibody ordered.


Storage and Transport

Use cold pack during transport of paraffin blocks and unstained slides. Cold pack should not be placed in direct contact with the specimen during shipping


Specimen Rejection Criteria

Click here to reference the specimen rejection criteria.


Turn Around Time (TAT): 2-3 Days


CPT Codes*: 88341, 88342, 88360


*The CPT codes provided with our Test Descriptions are based on AMA guidelines and are for informational purposes only. Correct CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed.