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HelpTest ID COGTF T-Cell Acute Lymphoblastic Leukemia (T-ALL), Children's Oncology Group Enrollment Testing, FISH, Varies
Ordering Guidance
This test is only performed on specimens from pediatric patients being considered for enrollment in a Children's Oncology Group (COG) protocol. For all other patients, order TALLF / T-Cell Acute Lymphoblastic Leukemia (T-ALL), FISH, Varies.
This test should not be ordered on blood and bone marrow specimens from patients with T-cell lymphoma. In these situations, order TLPF / T-Cell Lymphoma, FISH, Varies.
Shipping Instructions
Advise Express Mail or equivalent if not on courier service.
Necessary Information
1. Provide a reason for referral with each specimen as well as flow cytometry and/or a bone marrow pathology report and Children's Oncology Group (COG) protocol number. The laboratory will not reject testing if this information is not provided, but appropriate testing and interpretation may be compromised or delayed.
2. If a child enrolled in the COG protocol has received an opposite sex bone marrow transplant prior to specimen collection, convey this information to the laboratory.
Specimen Required
Submit only 1 of the following specimens:
Preferred Specimen Type: Bone marrow
Container/Tube: Green top (sodium heparin)
Specimen Volume: 1 to 2 mL
Collection Instructions: Invert several times to mix bone marrow.
Acceptable Specimen Type: Blood
Container/Tube: Green top (sodium heparin)
Specimen Volume: 6 mL
Collection Instructions: Invert several times to mix blood.
Useful For
Evaluation of pediatric bone marrow and peripheral blood specimens by fluorescence in situ hybridization probe analysis for classic rearrangements and chromosomal copy number changes associated with T-cell acute lymphoblastic leukemia in patients being considered for enrollment in Children's Oncology Group clinical trials and research protocols
Highlights
Cytogenetic testing is important for the diagnostic and prognostic classification of pediatric neoplasia and it is a critical element for the enrollment of children into clinical trials affiliated with the Children's Oncology Group (COG). For over 25 years, the Mayo Clinic Genomics Laboratory has served as one of a select number of laboratories in the United States approved by the COG for the conventional chromosome analysis and fluorescence in situ hybridization analysis of pediatric bone marrow, peripheral blood, and tissue specimens. All enrollment-required elements of cytogenetic testing will be electronically submitted by the Mayo Clinic Genomics Laboratory within the guidelines of COG.
Reflex Tests
| Test ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|
| _I099 | Interphases, 25-99 | No, (Bill Only) | No |
| _I300 | Interphases, >=100 | No, (Bill Only) | No |
| _IL25 | Interphases, <25 | No, (Bill Only) | No |
| _PADD | Probe, +1 | No, (Bill Only) | No |
| _PB02 | Probe, +2 | No, (Bill Only) | No |
| _PB03 | Probe, +3 | No, (Bill Only) | No |
| _PBCT | Probe, +2 | No, (Bill Only) | No |
Testing Algorithm
This test is only performed on specimens from pediatric patients who are candidates for enrollment in Children's Oncology Group clinical trials and research protocols.
The following testing algorithm is recommended for patients with T-cell acute lymphoblastic leukemia (T-ALL):
-At diagnosis, standard (diagnostic) T-ALL fluorescence in situ hybridization (FISH) panel and/or conventional chromosome studies COGBM / Chromosome Analysis, Hematologic Disorders, Children's Oncology Group Enrollment Testing, Bone Marrow should be performed. If there is limited specimen available, only the COGTF / T-Cell Acute Lymphoblastic Leukemia (T-ALL), Children's Oncology Group Enrollment Testing, FISH, Varies test will be performed.
Panel includes testing for the following abnormalities using the probes listed:
1p33 rearrangement, TAL1/STIL
t(5;14) TLX3/BCL11B
7q34 rearrangement, TRB
9p-, CDKN2A/D9Z1
t(9;22) or ABL1 amplification, BCR/ABL1
t(10;11), MLLT10/PICALM
11q23 rearrangement, MLL (KMT2A)
14q11.2 rearrangement, TRAD
17p-, TP53/D17Z1
When an MLL (KMT2A) rearrangement is identified, reflex testing will be performed to identify the translocation partner. Probes include identification of t(4;11)(q21;q23) AFF1/MLL, t(6;11)(q27;q23) MLLT4/MLL, t(9;11)(p22;q23) MLLT3/MLL, t(10;11)(p13;q23) MLLT10/MLL, t(11;19)(q23;p13.1) MLL/ELL or t(11;19)(q23;p13.3) MLL/MLLT1.
When a TRAD rearrangement is identified, reflex testing will be performed to identify the translocation partner. Probes include identification of t(8;14)(q24.1;q11.2) MYC/TRAD, t(10;14)(q24;q11.2) TLX1/TRAD, t(11;14)(p15;q11.2) LMO1/TRAD or t(11;14)(p13;q11.2) LMO2/TRAD.
When a TRB rearrangement is identified, reflex testing will be performed to identify the translocation partner. Probes include identification of t(7;10)(q34;q24) TRB/HOX11, t(7;11)(q34;p15) TRB/LMO1, t(7;11)(q34;p13) TRB/LMO2, or t(6;7)(q27;q34) TRB/MYB.
-If this test is ordered and the laboratory is informed that the patient is not on a COG protocol, this test will be canceled and automatically reordered by the laboratory as TALLF / T-Cell Acute Lymphoblastic Leukemia (T-ALL), FISH, Varies.
Method Name
Fluorescence In Situ Hybridization (FISH)
Reporting Name
COG, ALL (T-cell), FISHSpecimen Type
VariesSpecimen Minimum Volume
Blood: 2 mL
Bone Marrow: 1 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Varies | Ambient (preferred) | ||
| Refrigerated | |||
Reference Values
An interpretive report will be provided.
Day(s) Performed
Monday through Friday
Report Available
7 to 10 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
Test Classification
This test was developed using an analyte specific reagent. Its performance characteristics were 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
88271 x 2, 88291-DNA probe, each (first probe set), Interpretation and report
88271 x 2-DNA probe, each; each additional probe set (if appropriate)
88271-DNA probe, each; coverage for sets containing 3 probes (if appropriate)
88271 x 2-DNA probe, each; coverage for sets containing 4 probes (if appropriate)
88271 x 3-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 |
|---|---|---|
| COGTF | COG, ALL (T-cell), FISH | In Process |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 602286 | Result Summary | 50397-9 |
| 602287 | Interpretation | 69965-2 |
| 602288 | Result Table | 93356-4 |
| 602289 | Result | 62356-1 |
| GC016 | Reason for Referral | 42349-1 |
| GC017 | Specimen | 31208-2 |
| 602291 | Source | 31208-2 |
| 602292 | Method | 85069-3 |
| 602293 | Additional Information | 48767-8 |
| 602294 | Disclaimer | 62364-5 |
| 602295 | Released By | 18771-6 |