F.I.S.H. in PATHOLOGY; Applications,Answers..and More Allan Kennedy Lead Biomedical Scientist (Molecular Pathology) Glasgow Royal Infirmary
Samples Tissue Imprints Blood Formalin-fixed, paraffin embedded sections-usually 1µm thick!
TECHNIQUE ACCESS THE TARGET DENATURE HYBRIDISE COUNTERSTAIN VIEW
F.I.S.H. WORK STATION
Probe use Enumeration; Loss or Amplification Breakapart; specific gene targeted Dual Fusion; specific translocations detected
ENUMERATION PROBES e.g. Her2, CLL
Ideogram Her2 probe set
Normal Her2
AMPLIFIED HER2
Her2 ; Polysomy
Monosomy 17 with Her2 Amplification
Chronic Lymphocytic Leukemia (C.L.L.)
CLL PROBE SET
CLL P53 (17p13.1) Red ATM (11q22.3) Green;
CLL P53 (17p13.1) Red ATM (11q22.3) Green; Loss of ATM associated with progressive disease
CLL:Loss of p53 associated with progressive disease and Fludarabine resistance P53 (17p13.1)Red ATM (11q22.3) Green
Oligodendroglial Tumours Loss of Heterozygosity 1p/19q ?
1p36 Red 1q25 Green Loss of 1p36
19p13 green 19q13 red Loss of 19q
DUAL COLOUR DUAL FUSION PROBES e.g.(t11:14, t14:18)
Molecular Pathogenetic Mechanisms in Rhabdomyosarcoma and Ewing’s Sarcoma
t14:18 Negative Chr14 Green (IgH) Chr18 Red (bcl2) CEP18 Aqua
T14:18 Positive Chr14 Green (IgH) Chr18 Red (bcl2) CEP18 Aqua Translocations Yellow
BREAKAPART PROBES e.g. cMyc
cMyc Negative
C-Myc (8q24) Positive
ANSWERS
? Burkitt’s Lymphoma ?DLBCL LCA,CD10,CD20,bcl6 ;Positive TdT,CD5,MUM-1; Negative FISH REQUEST FOR c-Myct8:14t14:18
C-Myc (8q24) Positive
t8:14 Positive
t14:18 Negative - Burkitt’s Lymphoma
? Burkitt ?Follicular Lymphoma CD20,CD10,; Positive CD5,Cyclin D1,CD23,bcl2; Negative
Myc negative
t14:18 (IgH / bcl 2) positive
Bcl6 (3q27) translocation negative; Follicular Lymphoma
Sarcomas
Molecular Diagnosis of Sarcomas TumorTranslocation Fusion Gene Ewing/PNETt(11;22)(q24;q12)EWS/FLI1 t(21;22)(q22;q12)EWS/ERG Alveolar Rhabdomyosarcoma t(2;13)(q35;q14)PAX3/FKHR t(1;13)(p36;q14)PAX7/FKHR Desmoplastic small round cell tumor t(11;22)(p13;q12)EWS/WT1 Synovial Sarcoma t(X;18)(p11.2;q11.2)SYT/SSX1+2 Congenital Fibrosarcoma t(12;15)(p13;q25)ETV6/NTRK3 Clear Cell Sarcoma t(12;22)(q13;q12)EWS/ATF1
Sarcoma ? Ewings Sarcoma ? Synovial sarcoma
Syt-Negative
EWS Positive-Ewings Sarcoma
? ALVEOLAR RHABDOMYOSARCOMA TEST FOR; t1:13t2:13 FKHR breakapart
t1:13 (Pax7 green/FKHR red ) Negative
t2:13 (Pax 3 green /FKHR red) Positive
FKHR (13q14) Positive
ANSWERS…and MORE
CLL P53 (17p13.1) Red ATM (11q22.3) Green;
t11:14 IgH 14q32 Green Bcl2 18q21 Red CEP11 aqua
Amplified Her2 Ratio 2.3
Amplified Her2 Ratio 10
Her2 ; Fusions?
Chromosome 17
Her2 gene
Her2 ; Triple Bandpass filter
Her2 gene
Chromosome 17
Her2 ; Homogeneously Stained Regions (HSR’s)
Her2;Double Minutes
Need to record all observations-whether expected or not! Need to collaborate across centres Need close co-operation with Pathologists Boundaries between Pathology, Genetics and Haematology rapidly blurring
Thank You