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8 protocols using ini 1

1

Comprehensive Immunohistochemical Analysis of Tumors

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Immunohistochemistry (IHC) was performed using Envision+ Dual Link, Peroxidase (Dakocytomation) or standard streptavidin technique (Jackson) with a 3-3’-diaminobenzadine (DAB) chromogen. The primary anti-bodies utilized for classification of this tumor were as follows: CD99 (M; O13; Signet), desmin (M; 33; Accurate Chemical & Scientific), smooth muscle actin (SMA) (M; IA4; Dako), chromogranin A (R; Dako), epithelial membrane antigen (EMA) (M; E29; Cell Marque), S-100 (P; Dako), vimentin (M; V9; BioGenex), cytokeratin cocktail (M; AE1 and AE3 and CAM 5.2, KA4 and UC2/PR-10-11; Becton-Dickerson and Zymed/ThermoFisher Scientific), CD45 (M; PD7/26 and 2B11; Cell Marque); CD138 (M; MI15; Dako), CD31 (M; JC/70A; Cell Marque), CD34 (M; QBEnd/10; Dako), PLAP (M; 8A9; Dako), CD68 (M; KPI; Cell Marque), CD117 (R; Diagnostics Biosystems), GFAP (M; GA-5 Biogenex), INI-1 (M; BAF47; BD Bioscience), and WT-1 (M;6F-H2; Dako).
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2

Immunohistochemical Staining of FFPE Tissue

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Immunohistochemical staining was performed on 5-micron cut sections of formalin-fixed, paraffin-embedded (FFPE) tissue blocks of all cases on Ventana staining system (Ventana Medical Systems, Tucson AZ, USA). All cases were stained with INI1 (monoclonal mouse antibody; 1:400; BD Bioscience, San Jose, CA, USA), Hep-par1 (mouse monoclonal antibody; 1:200; Dako, Santa Clara, CA, USA), Arginase (rabbit monoclonal antibody; 1:100; Sigma-Aldrich, St. Louis, MO, USA) and glypican-3 (mouse monoclonal antibody; ready to use; Sigma-Aldrich, St. Louis, MO, USA) antibodies.
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3

Immunohistochemical Characterization of Tumors

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When necessary, additional immunohistochemical stains were performed to facilitate the reclassification of tumors using the 2016 WHO classification system including molecular subgrouping of medulloblastomas. These immunohistochemical stains included: INI‐1 (BD Biosciences, 612111, 1:100), BRG1 (Santa Cruz Biotechnology, sc‐17796, 1:400), GFAP (Dako, 6F2, 1:400), synaptophysin (Dako, SY38, 1:100), neurofilament (Thermo Scientific, QL215385, 1:400), EMA (Dako, E29, 1:200), IDH1‐R132H (Dianova, DIA‐H09‐L), ATRX (Sigma, HPA001906, 1:100), H3K27M (Sigma, SAB5600095, 1:1000), GAB1 (Santa Cruz Biotechnology, sc‐133191, 1:400), YAP1 (Santa Cruz Biotechnology, sc‐101199, 1:200), LEF1 (abcam, EPR2029Y, 1:100), beta‐catenin (BD Biosciences, 610154, 1:1000) and p53 (Dako, DO‐7, 1:100). Staining was performed on the Leica Bond‐IIITM Autostainer using the Bond Polymer Refine Detection System (Leica Microsystems DS9800) with the DAB chromagen. Nuclei were counterstained with hematoxylin. Other immunostains that were previously performed as part of the initial clinical immunohistochemical workup included: vimentin, OLIG2, CD45, TdT, desmin, myoD1, myogenin, OCT4, HMB45, SOX10, AE1‐3, transthyretin, CD31 and CD34.
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4

Immunohistochemical Evaluation of INI1

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Tissues were fixed in 4% paraformaldehyde, dehydrated and embedded in paraffin. Immunohistochemistry was performed according to standard protocols on 3–4 µm sections. Sections were subjected to H&E and immunohistochemical staining with the following primary antibodies: INI1 (BD Transduction Laboratories, 612111, 1:400).
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5

Immunohistochemical Profiling of Tumor Markers

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Immunohistochemical labeling was performed on the Benchmark XT autostainer (Ventana Medical Systems Inc, Tucson, AZ) using the I-View detection kit. The standard antibodies used, vendors, pretreatments, and dilutions included: cytokeratin AE1/3 (Chemicon, steam, 1:4000), EMA (Ventana, 760–4259, steam, prediluted), WT1 (Cell Marque, clone 6F-H2, Steam, Prediluted), Calretinin (Biocare, Steam, Prediluted polyclonal), desmin (Dako M0760, clone D33, steam, 1:100), CD99 (Leica, Clone 12E7, steam, prediluted), S100 protein (Ventana, 760–2914, stream, prediluted), BAP-1 (Santa Cruz, clone C-4, steam, 1:200), and INI-1 (BD Transduction Laboratories, clone 25/BAF47, steam, 1:100).
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6

Multimodal Tissue Profiling Protocol

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Tissues and organoids were fixed in 4% paraformaldehyde, dehydrated and embedded in paraffin. Immunohistochemistry was performed according to standard protocols on 3–4 µm sections. Sections were subjected to H&E, immunohistochemical as well as immunofluorescence staining. The following primary antibodies were used for immunohistochemical staining: desmin (Leica Novacastra, NCL-L-Des-Der11, 1:100), INI-1 (BD Transduction Laboratories, 612111, 1:400), P53 (Dako, M7001, 1:6000). For immunofluorescence on tissues: SIX2 (Proteintech, 11562-1-AP, 1:200), E-cadherin clone ECCD-2 (ThermoFisher, 13-1900, 1:200), CD90 clone EPR3133 (Abcam, 133350, 1:100) were used. Imaging was performed using Leica DM6 microscope.
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7

Immunohistochemical Profiling of Tumor Markers

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Immunohistochemical labeling was performed on the Benchmark XT autostainer (Ventana Medical Systems Inc, Tucson, AZ) using the I-View detection kit. The standard antibodies used, vendors, pretreatments, and dilutions included: cytokeratin AE1/3 (Chemicon, steam, 1:4000), EMA (Ventana, 760–4259, steam, prediluted), WT1 (Cell Marque, clone 6F-H2, Steam, Prediluted), Calretinin (Biocare, Steam, Prediluted polyclonal), desmin (Dako M0760, clone D33, steam, 1:100), CD99 (Leica, Clone 12E7, steam, prediluted), S100 protein (Ventana, 760–2914, stream, prediluted), BAP-1 (Santa Cruz, clone C-4, steam, 1:200), and INI-1 (BD Transduction Laboratories, clone 25/BAF47, steam, 1:100).
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8

Immunohistochemical Analysis of Soft Tissue Tumors

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Sections were cut at 4 μm thick from formalin-fixed-paraffin-embedded (FFPE) tissue and immunostained using a VentanaBenchmark XT automatic stainer (Ventana, Tuscon, AZ, USA). Signals were revealed using the ultraView Universal Dab Detection kit (Ventana). The following antibodies were used: CD99 (12E7, Dako), EMA (E29, 1:50, Dako), desmin (D33, 1:80, Dako), cytokeratin AE1/AE3 (AE1/AE3, 1:50, Dako), caldesmon (h-CD, 1:100, Dako), myogenin (F5D, 1:100, Dako), S100 protein (Z0311, 1:800, Dako), CD34 (QBend-10, 1:25, Dako), INI1 (25, 1:50, BD Transduction Laboratories), BCOR (C-10, 1:50, Santa Cruz), ETV4 (16, 1:50, Santa Cruz). Immunohistochemistry for NTRK1 was performed using a 32 min incubation with the NTRK1 antibody (ab76291, clot EP1058Y, Abcam, dilution 1:200) on a Ventana ULTRA machine with Cell Conditioning Solution 1 pre-treatment for 64 min.
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