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Journal Reading 醫學系七年級 (Intern):陳姿璇(B8701059) 指導教授 : 鄭建睿 醫師
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Journal Reading The American Journal of Surgical Pathology 27: 750-761, 2003 Aberrant nuclear immunoreactivity for TFE3 (Transcription Factor E3) in neoplasms with TFE3 gene fusions A sensitive and specific immunohistochemical (IHC)assay The department of pathology, Johns Hopkins Medical Institutions, Baltimore,Maryland and the department of pathology, Memorial Sloan- Kettering Cancer Center,NewYork
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Journal Reading Recurrent chromosomal translocations Gene fusions Novel chimeric proteins Tumor-specific diagnostic immunohistochemistry (IHC) assays Falini and Mason
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Immunohistochemistry (IHC) assays Antibody-fusion protein breakpoint; Difficulty in raising specific antibodies Robust antibodies-a portion of one of the proteins; Successful, overexpression ALK1, anaplastic large cell lymphoma; inflammatory myofibroblastic tumor The C-terminus of WT1desmoplastic small round cell tumor
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Breakpoints
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Alveolar Soft Part Sarcoma (ASPS) t(X;17),(p11.2;q25) TFE3 (Transcription Factor E3), chromosome X p 11.2 Renal cell carcinomas, children and young adults ASPL ( Alveolar Soft Part Sarcoma Locus) gene, chromosome 17q25 unknown
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Renal cell carcinomas t (X;1)(p11.2;q21) TFE3-PRCC(P apillary Renal Cell Carcinoma) gene fusion t (X;17)(p11.2;q25) TFE3-ASPL ( Alveolar Soft Part Sarcoma Locus) gene fusion Xp11.2, TFE3 gene, 3’ end IHC, useful diagnostic marker
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Material and Methods Positive control cases: Formalin-fixed, paraffin-embedded tissue sections Xp11.2,TFE3 ASPS, three types of renal carcinoma ASPS-positive control group: 19 Renal carcinoma-positive control group:21 t(X;17)(p11.2;q25)/ ASPL ( Alveolar Soft Part Sarcoma Locus) -TFE3: 7 t(X;1)(p11.2;q21)/ PRCC (P apillary Renal Cell Carcinoma) -TFE3: 11 t(X;1)(p11.2;p34)/ PSF( PTB-associated splicing factor) -TFE3: 3
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Material and Methods Screening cases: Organ-specific tissue microarray (TMAs) Memorial Sloan Kettering Cancer Center: High-density TMA: 7-270 cores, ranging from 3 to 6 cores per tumor, with a core diameter of 0.4-1.0mm Low-density TMA: 27-35 cores, single core per tumor, 3mm in diameter The Johns Hopkins Hospital: TMA: 99 spots,2mm in diameter Positive/weak positive-donor blocks- whole sections -immunostained for TFE3
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Material and Methods
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Test cases: Archival pediatric renal carcinoma cases Lack of frozen tissue, molecular analysis TFE3 antibody: P-16 polyclonal antibody
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Material and Methods
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IHC method: 4um sections mounted onto positively charged slides Xylene- deparaffinized-30 minutes Ethanol-rehydrated Steamed for 30 minutes at 98-99C in EDTA buffer in a vegetable steamer Quenching: Hydrogen peroidase Biotin blocking: Avidin Incubation overnight:1:600dilution polyclonal antibody in phosphate-buffered saline Detection: biotinylated secondary antibody, horseradish peroxidase-conjugated streptavidin, 3’-3’-diaminobenzidine (Chromogen)
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Material and Methods Scoring of TFE3 nuclear immunoreactivity: 0-3+, Nucleus 1+: weak/equivocal (negative) 2+: moderate 3+ strong readily apparent at low-power magnification (4X objective)
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Material and Methods
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Results Normal tissues: lung, thyroid, lymph node, breast,colon,liver,gallbladder,pancreas,uteru s,ovary,bone,kidney,bladder,adrenal, prostate and skin No detectable TFE3 nuclear protein 1/18 chronic pancreatitis,weak(1+)
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Results Positive control cases: tumors with knownXp11.2 translocationsorTFE3 gene fusions: 39/40: moderate or strong 19 ASPS: 18 strong ;1 moderate 7 t(X;17)(p11.2;q25) (ASPL-TFE3): 2 strong; 5 moderate 3 t(X;1)(p11.2;p34)(PSF-TFE3): strong 11 t(X;1)(p11.2;q21)(PRCC-TFE3): 1 weak (negative); 2 strong; 8 moderate
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Results
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Screening cases: Table 1 6/1476 TMA: negative
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Results
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Test cases: relationship between TFE3 immunoreactivity and morphology in pediatric renal carcinoma: 11 cases 8 TFE3: 5 ASPL-TFE3; 3PRCC-TFE3 7/8: TFE3 staining (5ASPL-FE; 2 PRCC- TFE3)
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Results
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Discussion TFE3(Transcription Factor E3):a basic helix-loop-helix DNA binding domain and a leucine zipper dimerization domain Nuclear localization signal Native TFE3 protein: not detectable Half-life short, tightly regulated Strong nuclear immunoreactivity: highly sensitive, highly specific Sensitivity:97.5% (39/40)---100% Bouin’s acidic fixative: render specific antigen less detecbale by IHC Specificity: 99.6% (6/1476)---99.1%
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TFE3(Transcription Factor E3)
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Discussion
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3 ASPS blocks: >20 years of age, strong time 1 PSF-TFE3 block: unstained over one year, stored at room temperature oxidation Immunoreactivity: edges> center complete fixation
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Discussion False-positive: upregulated native TFE3 protein artifacts of fixation ASPS: PAS (Periodic acid-Schiff) stain: needle- shaped cytoplasmic deposits Clear cell sarcoma of kidney (CCSK): fine chromatin of CCSK nuclei, chemotherapy: doxorubicin Xp11.2-related renal cell carcinoma: interferon
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Discussion The prevalence of these tumors in adults and children: One 68-year-old woman, one 38-year-old man, one 39-year-old woman: ASPL-TFE3 Adult: rare
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Reference Atlas of Genetics and Cytogenetics in Oncology and Haematology http://www.infobiogen.fr/services/chromcancer/Ge nes/TFE3ID86.html http://www.infobiogen.fr/services/chromcancer/Ge nes/TFE3ID86.html
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