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Test Code BAP1 BAP1 Immunostain, Technical Component Only

Shipping Instructions

Attach the green pathology address label and the pink Immunostain Technical Only label included in the kit to the outside of the transport container.

Specimen Required

Supplies: Immunostain Technical Only Envelope (T693)

Specimen Type: Tissue

Container/Tube: Immunostain Technical Only Envelope (T693)

Preferred: 2 unstained positively charged glass slide (25- x 75- x 1-mm) per test ordered; sections 4-microns thick.

Acceptable: Formalin-fixed, paraffin-embedded (FFPE) tissue block

Additional Information:

1. Information on accessing digital images of IHC stains and the manual requisition form can be accessed through this website:

2. Clients ordering stains using a manual requisition form will not have access to digital images.

3. Clients wishing to access digital images must place the order for IHC stains electronically. Information regarding digital imaging can be accessed through this website:


If not ordering electronically, complete, print, and send an Immunohistochemical (IHC)/In Situ Hybridization (ISH) Stains Request Form (T763) (

Secondary ID


Reflex Tests

Test ID Reporting Name Available Separately Always Performed
IHTOI IHC Initial, Tech Only No No
IHTOA IHC Additional, Tech Only No No

Method Name


Reporting Name

BAP1 IHC, Tech Only

Specimen Type


Specimen Stability Information

Specimen Type Temperature Time
TECHONLY Ambient (preferred)

Reject Due To








Wet/frozen tissue

Cytology smears

Nonformalin fixed tissue

Nonparaffin embedded tissue

Noncharged slides

ProbeOn slides

Clinical Information

BRCA1-asssociated protein 1 (BAP1) is a deubiquitinating enzyme that is a member of the polycomb group proteins of transcriptional repressors and exhibits tumor suppressive activity. BAP1 is located on chromosome 3p21 where loss of 1 copy of the gene and inactivating mutations are associated with the increased risk and development of various tumors such as malignant mesotheliomas, uveal melanomas, clear cell renal cell carcinoma, and esophageal squamous carcinomas. In some of these cases, loss of nuclear staining for BAP1 has been reported.


This test includes only technical performance of the stain (no pathologist interpretation is performed). If diagnostic consultation by a pathologist is required order PATHC / Pathology Consultation.


The positive and negative controls are verified as showing appropriate immunoreactivity. If a control tissue is not included on the slide, a scanned image of the relevant quality control tissue is available upon request. Contact 855-516-8404.


Interpretation of this test should be performed in the context of the patient's clinical history and other diagnostic tests by a qualified pathologist.

Clinical Reference

1. Carbone M, Ferris LK, Baumann F, et al: BAP1 cancer syndrome: malignant mesothelioma, uveal and cutaneous melanoma, and MBAITS. J Transl Med 2012;10:179-185

2. Koopmans AE, Verdijk RM, Brouwer RWW, et al: Clinical significance of immunohistochemistry for detection of BAP1 mutations in uveal melanoma. Mod Path 2014;27:1321-1330

3. Joseph RW, Kapur P, Serie DJ, et al: Clear cell renal cell carcinoma subtypes identified by BAP1 and PBRM1 Expression. Jl of Urology 2015;195:1-8

4. Klebe S, Driml J, Nasu M, et al: BAP1 hereditary cancer predisposition syndrome: a case report and review of literature. Biomark Res 2015;3:14-20

5. Mori T, Sumii M, Fujishima F, et al: Somatic alteration and depleted nuclear expression of BAP1 in human esophageal squamous cell carcinoma. Cancer Sci 2015;106:1118-1129

6. Churg A, Sheffield BS, Galateau-Salle F: New markers for Separating Benign from Malignant Mesothelials: Are we there yet? Arch Pathol Lab Med 2016;140(4):318-321

Day(s) and Time(s) Performed

Monday through Friday

Analytic Time

1 day

Performing Laboratory

Mayo Medical Laboratories in Rochester

Test Classification

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

CPT Code Information

88342-TC, primary

88341-TC, if additional IHC

LOINC Code Information

Result ID Test Result Name Result LOINC Value
71488 BAP1 IHC, Tech Only In Process