FOLR1

Assay Description

Ventana FOLR1 (FOLR1-2.1) RxDx Assay is a qualitative immunohistochemical assay using mouse monoclonal anti-FOLR1, clone FOLR1-2.1, intended for use in the assessment of folate receptor alpha (FOLR1) protein in formalin-fixed, paraffin-embedded epithelial ovarian, fallopian tube, or primary peritoneal cancer tissue specimens by light microscopy.

FOLR1 expression clinical cut-off is equal to or greater than 75% viable tumor cells with membrane staining at moderate and/or strong intensity levels.
This assay is indicated as an aid in identifying patients with epithelial ovarian, fallopian tube, or primary peritoneal cancer who may be eligible for treatment with ELAHERE (mirvetuximab soravtansine).

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

All specimens must be submitted according to the test directory instructions.  Before submitting specimen, please carefully review specimen requirements.

Listed below are possible causes for delays in specimen processing or possible specimen rejections or cancellations:

• No patient identification on requisition form
• No patient identification on specimen container or slides
• No referring provider
• No account information provided
• No test ordered on requisition
• No specimen source provided
• Inappropriate specimen type
• Insufficient volume for analysis
• Inappropriate specimen container
• Improper specimen transport
• Specimen leaked in transport
• Specimen submitted in incorrect or expired transport media
• Slides broken beyond repair on receipt
• Conflict between patient name on specimen and requisition form
• Specimen not properly preserved
• Sample containing a needle
• FFPE specimens of 5-µm thickness containing tumor content less than 10%

A representative from Client Services will attempt to contact your office  to resolve specimen problems.  Additional documentation may be requested from your office to be returned by fax.  In the event that resolution is not possible, the specimen may be returned to your office.

Turn Around Time (TAT)

2 Days

CPT Codes

88360