INI-1 (SMARCB1) pin

IHC

INI-1 (SMARCB1)

Alternate Test Names:
SMARCB1; BAF47; INI1

Methodology: IHC

Clinical Significance:
Identifies: The gene product of the INI-1 gene, also referred to as BAF47. This is a tumor suppressor gene, inactivation through mutation or other mechanism characterizes a unique subset of tumors that includes renal and extrarenal rhabdoid tumors, atypical teratoid/rhabdoid tumors of the central nervous system, distal and proximal variants of epithelioid sarcoma, as well as a subset of mesenchymal chondrosarcomas, epithelioid malignant peripheral nerve sheath tumors, and soft tissue myoepitheliomas. Loss of immunostaining is the characteristic feature of these tumors.

Subcellular Localization: Nuclear

Organ: Brain/CNS

Disease State: Small, Blue, Round Cell Tumors, Spindle Cell Tumors / Sarcoma Subtyping

CPT Code(s): 88342 or 88341

Turnaround Time: Within 1-2 business days of receipt

Schedule: Monday - Friday

Specimen Requirements:
• Formalin-fixed, paraffin-embedded (FFPE) tissue block or cell block - OR -
• 1 unstained slide for each test requested plus 3-4 additional unstained slides cut at 4µm

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