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Below is the preliminary workshop program. Individual presentations and additional information will be posted shortly.

Thu - Nov 04

Fri - Nov 05

Sat - Nov 06

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FRIDAY, NOVEMBER 5, 2021

8:00 - 8:30 AM PLENARY LECTURE

LECTURE III Chairs: Amy Duffield, Johns Hopkins University School of Medicine, and German Ott, Institut fur Klinische Pathologie Robert-Bosch-Krankenhaus Regency Ballroom

GENETICS OF FOLLICULAR LYMPHOMA TRANSFORMATION Laura Pasqualucci. Institute for Cancer Genetics Columbia University

8:30 - 10:00 AM CASE PRESENTATIONS

SESSION 4: TRANSFORMATION OF FOLLICULAR LYMPHOMA Chairs: German Ott, Institut fur Klinische Pathologie Robert-Bosch-Krankenhaus, and Amy Duffield, Memorial Sloan Kettering Cancer Center Regency Ballroom

FOLLICULAR LYMPHOMA WITH BCL2 AND IHC/MYC REARRANGEMENTS AND PROGRESSION TO HIGH-GRADE B-CELL LYMPHOMA SHOWING ALTERNATIVE MYC REARRANGEMENT, PLASMACYTOID DIFFERENTIATION, AND EXTENSIVE IRF4/MUM1 POSITIVITY Eric Carlsen1, Steven Swerdlow1, 2. 1University of Pittsburgh Medical Center, Division of Hematopathology, Pittsburgh, PA, USA. 2University of Pittsburgh School of Medicine, Pittsburgh, PA, USA

FOLLICULAR LYMPHOMA WITH "DOUBLE-HIT" GENE REARRANGEMENTS AND ADJACENT IN SITU FOLLICULAR NEOPLASIA Nathaniel P. Havens, Rose C. Beck. University Hospitals Cleveland Medical Center/Case Western Reserve University School of Medicine, Cleveland, OH, USA

HIGH-GRADE B CELL LYMPHOMA WITH REARRANGEMENT OF MYC-, BCL2- AND BCL6-GENES AND CONCURRENT IN-SITU FOLLICULAR NEOPLASIA Katrin S. Kurz1, Lothar Tietze2, Kai Neben3, Heike Horn1, German Ott1. 1Robert-Bosch Krankenhaus, Stuttgart, Germany. 2Ortenau Klinikum, Lahr-Ettenheim, Germany. 3Klinikum Mittelbaden, Baden-Baden, Germany

POST-ALLOGENIC STEM CELL TRANSPLANT LATE RELAPSE OF FOLLICULAR LYMPHOMA WITH TRANSFORMATION INTO B-LYMPHOBLASTIC LYMPHOMA / HIGH GRADE B-CELL LYMPHOMA WITH TDT EXPRESSION AND WITH MYC, BCL2 AND BCL6 GENE REARRANGEMENTS Ye Lin Hock1, Shankara Paneesha2, Lisa James1, Simon Larkins3, Zbigniew Rudski1. 1Dept. of Cellular Pathology, University Hospitals Birmingham NHS Foundation Trust, Birmingham, United Kingdom. 2Dept. of Clinical Haematology, University Hospitals Birmingham NHS Foundation Trust, Birmingham, United Kingdom. 3West Midlands Regional Genetics Laboratory, Birmingham, United Kingdom

HIGH GRADE B CELL LYMPHOMA WITH MYC AND BCL2 GENE REARRANGEMENTS AND FOCAL TDT EXPRESSION Pallavi K Galera, Yanming Zhang, Kseniya Petrova-Drus, Mikhail Roshal, Ahmet Dogan. Memorial Sloan Kettering Cancer Center, New York, NY, USA

GERMAN OTT: SUMMARY OF OTHER SUBMITTED CASES FROM THIS CASE CLUSTER. .

10:00 - 10:30 AM BREAK

COFFEE BREAK Foyer

10:30 - 12:00 PM CASE PRESENTATIONS

SESSION 5: TRANSFORMATION OF OTHER B-CELL LYMPHOMAS Chairs: Amy Duffield, MSKCC, and German Ott, IKPRBK Regency Ballroom

HIGH GRADE B-CELL LYMPHOMA WITH TDT EXPRESSION ARISING FROM PROLYMPHOCYTIC B-CELL LEUKEMIA Gerard Frigola1, Olga Balagué1, 2, Mónica López-Guerra1, 2, Francisca Guijarro1, Alícia Palomino1, Cristina López2, Sílvia Beà1, 2, Dolors Colomer1, 2, Elias Campo1, 2. 1Hospital Clinic of Barcelona, Barcelona, Spain. 2Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain

AN UNUSUAL CASE OF FOLLICULAR LYMPHOMA WITH RELAPSE AS AN UNDIFFERENTIATED ROUND CELL TUMOR Ivonne/Aidee Montes-Mojarro1, Irina Bonzheim1, Julia Salmerón-Villalobos2, Itziar Salaverria2, Leticia Quintanilla-Martinez1, Falko Fend1. 1Institute of Pathology and Neuropathology, Eberhard Karls University of Tübingen–Comprehensive Cancer Center, University Hospital Tübingen, Tuebingen, Germany. 2Institut d'Investigacions Biomediques August Pi i Sunyer, Barcelona, Spain

AN UNUSUAL PATTERN OF CLASSIC HODGKIN LYMPHOMA-LIKE TRANSFORMATION OF FOLLICULAR LYMPHOMA Alisha D. Ware1, Amy S. Duffield2, Laura M. Wake1. 1Johns Hopkins University School of Medicine, Baltimore, MD, USA. 2Memorial Sloan Kettering Cancer Center, New York, NY, USA

DIFFUSE LARGE B CELL LYMPHOMA FOLLOWED BY CLASSIC HODGKIN LYMPHOMA BOTH HARBORING A BCL2 REARRANGEMENT SUGGESTING CLONAL RELATIONSHIP Rebecca King, Matthew Howard. Mayo Clinic, Rochester, MN, USA

PRECURSOR T-LYMPHOBLASTIC TRANSFORMATION OF MANTLE CELL LYMPHOMA Raffaella Santi1, Gioia Di Stefano1, 5, Matteo Piccini2, Benedetta Peruzzi3, Sara Bencini3, Massimo Granai4, 5, Raffaella Guazzo5, Cristiana Bellan5, Stefano Lazzi5, Roberto Caporale3, Lorenzo Leoncini5. 1Histopathology and Molecular Diagnostics, Careggi University Hospital, Florence, Italy. 2Hematology Unit, Careggi University Hospital, Florence, Italy. 3Flow Cytometry Diagnostic Center and Immunotherapy, Careggi University Hospital, Florence, Italy. 4Institute of Pathology, University Hospital of Tubingen, Tubingen, Germany. 5Department of Human Pathology and Oncology, University of Siena, Siena, Italy

AMY DUFFIELD: SUMMARY OF OTHER SUBMITTED CASES FROM THIS CASE CLUSTER. .

12:00 - 12:40 PM PLENARY LECTURE

LECTURE IV: KEYNOTE ADDRESS Chairs: Mariusz Wasik, Fox Chase Cancer Center Regency Ballroom

GENOMIC ORIGINS OF TRANSFORMATION AND TRANSDIFFERENTIATION IN BLOOD CANCERS Sandeep Dave. Duke Cancer Institute Duke University

12:55 - 1:55 PM LUNCH SYMPOSIUM

LUNCH SYMPOSIUM - THE CRITICAL ROLE OF PATHOLOGY IN THE DIAGNOSIS OF CASTLEMAN DISEASE Chairs: Ahmet Dogan Regency Ballroom

INTRODUCTION TO CASTLEMAN DISEASE Ahmet Dogan.

UNICENTRIC CD Joseph Khoury.

MULTICENTRIC CD (MCD) WITH SPECIFIC ETIOLOGY Amy Chadburn.

IDIOPATHIC MCD (IMCD) Daisy Alapat.

FACULTY PANEL DISCUSSION.

2:10 - 4:05 PM CASE PRESENTATIONS

SESSION 6: PROGRESSION OF HODGKIN LYMPHOMA, PLASMABLASTIC LYMPHOMA AND PLASMA CELL MYELOMA Chairs: Reza Nejati, Fox Chase Cancer Center, and James Cook, Cleveland Clinic Regency Ballroom

INITIAL CLASSIC HODGKIN LYMPHOMA AND SUBSEQUENT DIFFUSE LARGE B-CELL LYMPHOMA: SEPARATE ENTITIES WITH A CONTINUUM OF BCL2 REARRANGEMENT Zhihong Hu1, Lei Chen1, Amanda C Herrmann1, Wei Josephine Wang1, Hanadi S El Achi1, Amer Wahed1, Wei Wang2. 1The University of Texas Health Science Center at Houston, Houston, TX, USA. 2The University of Texas MD Anderson Cancer Center, Housotn, TX, USA

T-CELL/ HISTIOCYTE-RICH LARGE B-CELL LYMPHOMA-LIKE TRANSFORMATION OF NODULAR LYMPHOCYTE PREDOMINANT HODGKIN LYMPHOMA Shenon Sethi, Kseniya Petrova-Drus, Erel Joffe, Ahmet Dogan. Memorial Sloan Kettering Cancer Center, New York, NY, USA

PROGRESSION OF GRAY ZONE LYMPHOMA TO CLASSIC HODGKIN LYMPHOMA Umut Aypar, Ahmet Dogan. Memorial Sloan Kettering Cancer Center, New York City, NY, USA

TREATED FOR CLASSICAL HODGKIN LYMPHOMA 4 YEARS AGO, SHE RELAPSES FROM ANAPLASTIC LARGE CELL LYMPHOMA, ALK NEGATIVE Julie Bruneau1, Pierre Isnard1, Danielle Canioni1, Lucile Couronné2, Louise Naveau3, Estelle Blanc4, Josette Brière1, Thierry-Jo Molina1. 1Pathology Department, Necker - Enfants Malades Hospital, Paris France. 2Hematology Laboratory, Necker - Enfants Malades Hospital, Paris France. 3Hematology Department, Necker - Enfants Malades Hospital, Paris France. 4Nuclear Medicine Department, Saint Louis Hospital, Paris France

CLONAL EVOLUTION OF MULTIPLE MYELOMA TO EXTRAMEDULLARY PLASMABLASTIC MYELOMA Ying Liu, Yanming Zhang, Umut Aypar, Caleb Ho, Mariko Yabe, Mamta Rao, Jeeyeon Baik, Mikhail Roshal, Ola Landgren, Ahmet Dogan, Wenbin Xiao. MSKCC, New York City, NY, USA

PROGRESSION OF PLASMA CELL MYELOMA TO IMMUNOPHENOTYPICALLY ABERRANT PLASMA CELL LEUKEMIA Megan O. Nakashima, Karl S. Theil. Cleveland Clinic, Cleveland, OH, USA

REZA NEJATI: SUMMARY OF OTHER SUBMITTED CASES FROM THIS CASE CLUSTER. .

4:05 - 4:35 PM BREAK

COFFEE BREAK Foyer

4:35 - 6:35 PM CASE PRESENTATIONS

SESSION 7: TRANSFORMATION OF MARGINAL ZONE AND LYMPHOPLASMACYTIC LYMPHOMA Chairs: James Cook, CCF, and Reza Nejati, FCCC Regency Ballroom

SPLENIC MARGINAL ZONE LYMPHOMA TRANSFORMATION: DESCRIPTION OF A CASE. Fina Climent1, Silvia Bea2, Esmeralda de la Banda1, Juan Azcarate1, Ferran Nadeu2, Alba Navarro2, Mar Varela1, Dolors Colomer2. 1Department of Pathology. Hospital Universitari de Bellvitge-IDIBELL, L'Hospitalet de Llobregat (Barcelona) Spain. 2Department of Pathology. Hospital Clinic-IDIBAPS, Barcelona Spain

EBV-INDUCED DOUBLE HIT TRANSFORMATION OF SPLENIC B-CELL LYMPHOMA, IN A PATIENT WITH A CHRONIC HEPATITIS B VIRUS HEPATITIS. Thomas Tousseyn, Levi Jannis, Lise Waumans, Daan Dierickx, Lucienne Michaux. University Hospitals Leuven, Leuven, Belgium

TRANSFORMATION OF A SPLENIC RED PULP LYMPHOMA TO DIFFUSE LARGE B-CELL LYMPHOMA Chauncey Syposs IV, Andrew Evans. University of Rochester Medical Center, Rochester, NY, USA

FROM LYMPHOPLASMACYTIC LYMPHOMA TO DIFFUSE LARGE B-CELL LYMPHOMA: A CASE WITH EVIDENCE OF A COMMON CLONAL ORIGIN AND TUMOR PROGRESSION Luis Veloza, Bettina Bisig, Karine Lefort, Anne Carioli, Laurence de Leval . Institute of Pathology, Lausanne University Hospital (CHUV) and Lausanne University, Lausanne Switzerland

PLASMABLASTIC TRANSFORMATION OF LYMPHOPLASMACYTIC LYMPHOMA Damodaran Narayanan, Olga Pozdnyakova, Sam Sadigh. Brigham and Women's Hospital, Boston, MA, USA

JAMES COOK: SUMMARY OF OTHER SUBMITTED CASES FROM THIS CASE CLUSTER. .