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HelpTest Code TGOGF TGFBR3 (1p22), OGA (10q24) Rearrangement, FISH, Tissue
Ordering Guidance
This test does not include a pathology consultation. If a pathology consultation is requested, order PATHC / Pathology Consultation, and appropriate testing will be added at the discretion of the pathologist and performed at an additional charge.
Shipping Instructions
Advise Express Mail or equivalent if not on courier service.
Necessary Information
1. A pathology report is required for testing to be performed. If not provided, appropriate testing and/or interpretation may be compromised or delayed. Acceptable pathology reports include working drafts, preliminary pathology, or surgical pathology reports.
2. The following information must be included in the report provided:
-Patient name
-Block number - must be on all blocks, slides, and paperwork
-Date of collection
-Tissue source
3. A reason for testing must be provided. If this information is not provided, an appropriate indication for testing may be entered by Mayo Clinic Laboratories.
Specimen Required
Submit only 1 of the following specimens:
Preferred
Specimen Type: Tissue block
Collection Instructions: Submit a formalin-fixed, paraffin-embedded tumor tissue block. Blocks prepared with alternative fixation methods may be acceptable; provide fixation method used.
Additional Information:
1. Paraffin-embedded specimens can be from any anatomic location (skin, soft tissue, lymph node, etc).
2. Bone specimens that have been decalcified will be attempted for testing, but the success rate is approximately 50%.
Acceptable
Specimen Type: Tissue slides
Slides: 1 Hematoxylin and eosin stained and 6 unstained
Collection Instructions: Submit 1 slide stained with hematoxylin and eosin and 6 consecutive unstained, positively charged, unbaked slides with 5 micron-thick sections of the tumor tissue.
Useful For
Supporting the diagnosis of pleomorphic hyalinizing angiectatic tumor, or hemosiderotic fibrolipomatous tumors associated with rearrangement of the OGA and/or TGFBR3 gene when used in conjunction with an anatomic pathology consultation
Testing Algorithm
This test includes a charge for the probe application, analysis, and professional interpretation of results for 2 probe sets (4 individual fluorescence in situ hybridization [FISH] probes). No analysis charges will be incurred if an insufficient number of representative cells are available for analysis.
Method Name
Fluorescence In Situ Hybridization (FISH)
Reporting Name
TGFBR3, OGA, FISH, TsSpecimen Type
TissueSpecimen Minimum Volume
Slides: 1 Hematoxylin and eosin stained and 2 unstained
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Tissue | Ambient (preferred) | ||
| Refrigerated | |||
Reject Due To
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.Clinical Information
Chromosomal rearrangement involving the OGA (previously MGEA5) gene or the TGFBR3 gene have recently been associated with both pleomorphic hyalinizing angiectatic tumor of soft parts and hemosiderotic fibrolipomatous tumor. Either one or both rearrangements may be present and support a diagnosis in the proper clinical and pathologic context. Rearrangement of one or both genes may be present in other neoplastic processes and is not diagnostic in isolation. These rearrangements are unusual in that they do not result specific RNA transcript products and therefore are often not detectable through many next-generation sequencing approaches but can typically be detected by fluorescence in situ hybridization testing.
Reference Values
An interpretive report will be provided.
Interpretation
The result is considered positive when the percent of cells with separation of the OGA and/or TGFBR3 FISH probes with an abnormality exceeds the normal cutoff for the OGA and/or TGFBR3 FISH probe set.
A positive result suggests rearrangement of the OGA and/or TGFBR3 gene and likely reflects OGA and/or TGFBR3 fusion with a partner gene. The significance of this finding is dependent on the clinical and pathologic features.
The result is considered negative when the percent of cells with separation of the OGA and/or TGFBR3 FISH probes does not exceed the normal cutoff for the OGA or TGFBR3 FISH probe set.
A negative result does not exclude the presence of a OGA or TGFBR3 rearrangement.
Rearrangement of the OGA or TGFBR3 gene may be present in other neoplastic processes.
Cautions
This test is not approved by the US Food and Drug Administration, and it is best used as an adjunct to existing clinical and pathologic information.
Fixatives other than formalin (eg, Prefer, Bouin's) may not be successful for fluorescence in situ hybridization (FISH) assays. Non-formalin fixed specimens will not be rejected.
Paraffin-embedded tissues that have been decalcified may not be successful for FISH analysis. The success rate of FISH studies on decalcified tissue is approximately 50%.
FISH studies will be attempted if sufficient tumor is present for analysis. If insufficient tissue/tumor is available for testing, the pathologist reviewing the hematoxylin and eosin-stained slide may find it necessary to cancel testing.
If no FISH signals are observed post-hybridization, the case will be released indicating a lack of FISH results.
Method Description
The test is performed using laboratory-developed TGFBR3 (1p22) and OGA (10q24) dual-color break-apart strategy probes. Formalin-fixed, paraffin-embedded tissues are cut at 5 microns and mounted on positively charged glass slides. The selection of tissue and the identification of target areas on the hematoxylin and eosin (H and E)-stained slide are performed by a pathologist. Using the H and E-stained slide as a reference, target areas are etched with a diamond-tipped engraving tool on the back of the unstained slide to be assayed. The probe set is hybridized to the appropriate target areas, and 2 technologists independently analyze 50 interphase nuclei (100 total) with the results expressed as the percent of abnormal nuclei.(Unpublished Mayo method).
Day(s) Performed
Monday through Friday
Report Available
7 to 10 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
Test Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
88271x2, 88291 DNA probe, each (first probe set), Interpretation and report
88271x2-DNA probe, each; each additional probe set (if appropriate)
88271-DNA probe, each; coverage for sets containing 3 probes (if appropriate)
88271x2-DNA probe, each; coverage for sets containing 4 probes (if appropriate)
88271x3-DNA probe, each; coverage for sets containing 5 probes (if appropriate)
88274 w/modifier 52-Interphase in situ hybridization, <25 cells, each probe set (if appropriate)
88274-Interphase in situ hybridization, 25 to 99 cells, each probe set (if appropriate)
88275-Interphase in situ hybridization, 100 to 300 cells, each probe set (if appropriate)
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| TGOGF | TGFBR3, OGA, FISH, Ts | In Process |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 621842 | Result Summary | 50397-9 |
| 621843 | Interpretation | 69965-2 |
| 621844 | Result | 62356-1 |
| GC145 | Reason for Referral | 42349-1 |
| 621845 | Specimen | 31208-2 |
| 621846 | Source | 31208-2 |
| 621847 | Tissue ID | 80398-1 |
| 621848 | Method | 85069-3 |
| 621849 | Additional Information | 48767-8 |
| 621850 | Disclaimer | 62364-5 |
| 621851 | Released By | 19139-5 |
Reflex Tests
| Test ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|
| _PBCT | Probe, +2 | No | No |
| _PADD | Probe, +1 | No | No |
| _PB02 | Probe, +2 | No | No |
| _PB03 | Probe, +3 | No | No |
| _IL25 | Interphases, <25 | No | No |
| _I099 | Interphases, 25-99 | No | No |
| _I300 | Interphases, >=100 | No | No |