1/18/2019
Histiocytic and Dendritic Cell Lesions
L. Jeffrey Medeiros, MD MD Anderson Cancer Center
Outline
2016 classification of Histiocyte Society Langerhans cell histiocytosis / sarcoma Erdheim-Chester disease Juvenile xanthogranuloma Malignant histiocytosis Histiocytic sarcoma Interdigitating dendritic cell sarcoma Follicular dendritic cell sarcoma Rosai-Dorfman disease Hemophagocytic lymphohistiocytosis
Writing Group of the Histiocyte Society
1 1/18/2019
Major Groups of Histiocytic Lesions Group Name
L Langerhans-related
C Cutaneous and mucocutaneous
M Malignant histiocytosis
R Rosai-Dorfman disease
H Hemophagocytic lymphohistiocytosis
Blood 127: 2672, 2016
L Group
Langerhans cell histiocytosis Indeterminate cell tumor Erdheim-Chester disease
S100
Normal Langerhans cells
Langerhans Cell Histiocytosis “Old” Terminology Eosinophilic granuloma Single lesion of bone, LN, or skin
Hand-Schuller-Christian disease Lytic lesions of skull, exopthalmos, and diabetes insipidus
Sidney Farber Letterer-Siwe disease 1903-1973 Widespread visceral disease involving liver, spleen, bone marrow, and other sites
Histiocytosis X Umbrella term proposed by Sidney Farber and then Lichtenstein in 1953 Louis Lichtenstein 1906-1977
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Langerhans Cell Histiocytosis Incidence and Disease Distribution
Incidence
Children: 5-9 x 106 Adults: 1 x 106
Sites of Disease Poor Prognosis Bones 80% Skin 30% Liver Pituitary gland 25% Spleen Liver 15% Bone marrow Spleen 15% Bone Marrow 15% High-risk organs Lymph nodes 10% CNS <5% Blood 127: 2672, 2016 N Engl J Med 379: 856, 2018
Langerhans Cell Histiocytosis Solitary lesion of bone
Eosinophilic Granuloma
CD1a
Langerhans Cell Histiocytosis Lungs
Associated with smoking
BRAF V600E CD207
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Langerhans Cell Histiocytosis Lymph Nodes CD1a
LNs can be localized or a part of disseminated disease
This patient had generalized LNs and BRAF V600E mutation
Langerhans Cell Histiocytosis Morphologic Features
Frequency Feature 100% Langerhans cells (<5-75%) 92% Eosinophils 84% Multinucleated giant cells 75% Small lymphocytes 61% Necrosis 49% Neutrophils 29% Foamy histiocytes
Mild atypia (reactive type) in ~50% of cases Mitotic rate: 0-23/10 high power fields
Arch Pathol Lab Med 107: 59, 1983
Langerhans Cell Histiocytosis Immunophenotype and EM
Immunophenotype
S100+, CD1a+, CD207/langerin+
+/- BRAF V600E (mutation specific antibody)
+/- CD4, CD11c, CD45/LCA, CD68, lysozyme+
Note: S100, CD1a, and CD207/langerin are not restricted to Langerhans cells
Electron Microscopy
Birbeck granules (aka Langerhans bodies)
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CD207
Am J Surg Pathol 41: 1390, 2017 Cyclin D1
Langerhans Cell Histiocytosis Birbeck Granules
Also known as X bodies or Langerhans bodies
Birbeck granules are characteristic (but not unique to) Langerhans cells Presence is a reflection of membrane activity; function debated Contain langerin = a type II transmembrane lectin receptor
Francoise Basset, PhD
J Invest Dermatol 37: 51, 1961 Michael S. C. Birbeck, PhD CR Acad Sci (Paris) 261:5719, 1965 1925-2005
Langerhans Cell Histiocytosis Mutations in BRAF/MAP2K1 Are Common
Blood 116: 1919, 2010
BRAF V600E 18/40 (45%) MAP2K1 11/40 (27.5%)
Blood 124: 1655, 2014
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Extracellular MAPK/ ERK PATHWAY
RTK
VEGFR
PDGFR EGFR Cytoplasm
RAS GTP-binding proteins: Proteins HRAS, KRAS and NRAS
ARAF BRAF CRAF
P Encoded by MAP2K1 gene MEK1/2
P ERK 1/2
Nucleus Transcription Regulation of proliferation, apoptosis, • MAPK: Mitogen-activated protein kinase p90Rsk factors metabolism and immune response • ERK: Extracellular signal-regulated kinase
85% of LCH cases have genetic abnormalities of the MAPK pathway
They likely all do
Blood 128: 2533, 2016
Langerhans Cell Histiocytosis Misguided Myeloid Dendritic Cell Model
Model to explain the widely disparate presentations of LCH
Distribution of disease depends on the cell in which mutation/ERK activation occurs
Hematology Am Soc Hematol Educ Program 2015;2015:559-564
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Immunity 44: 439, 2016
“Histiocytosis X (HX) has the advantage of widespread use, although it has been applied to other types of histiocytosis. The generally recognized Langerhans cell derivation of HX makes Langerhans cell histiocytosis and attractive alternative.”
Arch Pathol Lab Med 107: 59, 1983
Langerhans Cell Histiocytosis (LCH) Rarely Associated with Lymphomas
Mantle cell lymphoma LCH
No BRAF V600E or MAP2K1 mutations
Lymphomas 5 Classical Hodgkin lymphoma 1 Mantle cell lymphoma 1 Angioimmunoblastic T-cell CD1a LCH was <10%; incidental Sergio Pina Oviedo, MD Mod Pathol 30: 734, 2017
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Langerhans Cell Histiocytosis Differential Diagnosis
Dermatopathic lymphadenopathy Indeterminate dendritic cell tumor Langerhans cell sarcoma
Dermatopathic Lymphadenopathy
S100
Benign reaction pattern associated with skin disease CD1a
Indeterminate Dendritic cell Tumor
Thought to be derived from normal precursors of Langerhans cells (so-called indeterminate cells)
Patients present with > nodules, papules or plaques on skin
Dermis-based disease that can extend into subcutaneous fat
Histologically looks like Langerhans cells histiocytosis But often no eosinophils
Immunophenotype: CD1a+, S100+, CD207-
Electron microscopy: No Birbeck granules
Genetics: ETV3-NCOA2/t(1;8)(q23.1;8q13.3) reported in 3 cases
Highly variable clinical course: Spontaneous regression or progression
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Indeterminate Dendritic Cell Tumor
CD1a
A negative langerin/CD207 is required to make this diagnosis CD207
Langerhans Cell Sarcoma
Definition A high-grade neoplasm with overt malignant cytologic features and Langerhans cell phenotype History Rarely preceded by typical LCH (in my experience)
Age and Sites of Disease Median 41 yrs (10-72yrs) Extranodal ~ 80% (most often skin); nodal ~ 20%
Ancillary Support for Diagnosis Immunohistochemistry: S-100+, CD1a+, CD207/langerin+ Electron microscopy: Birbeck granules
Genetics Rare cases with monoclonal IGH rearrangements
Prognosis ~50% mortality as a result of progressive disease
Langerhans Cell Sarcoma
CD207
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Erdheim-Chester Disease Definition
“A clonal, systemic proliferation of histiocytes, commonly having a foamy (xanthomatous) component and containing Touton giants cells.”
2017 WHO book p. 481
Described by W. Chester in single author paper in German in 1930.
J. Erdheim was mentor
Renamed Erdheim-Chester disease in 1972
Jacob Erdheim, MD William Chester, MD
Erdheim-Chester Disease Clinicopathologic Features Age and Sex Ratio Median 53 years (range, 20-74) 3 men to 1 woman Symptoms Can be asymptomatic or aggressive; related to sites Dull and deep bone pain common (especially knees) Histologic features Bland histiocytes infiltrate tissues Foamy or eosinophilic cytoplasm; Touton giant cells Fibrosis is common; +/- lymphocytes, plasma cells, eos No mitoses, necrosis, granulomas, emperipolesis Looks/phenotypes like juvenile xanthogranuloma Imaging Bilateral, symmetric cortical osteosclerosis of long bones Surrounds aorta (“coated”) or kidney (“hairy kidney”) Genetics BRAF V600E mutations in ~50%, ~4% NRAS, ~10% PI3KA Blood Advances 1:357, 2017
Erdheim-Chester Disease
Positive CD14 CD68 CD163 Fascin Factor XIII
Negative CD1a CD207
S100+ ~20%
CD68 CD1a
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Erdheim-Chester Disease Radiologic Images
Case courtesy of Dr Andrew Lawson Radiopaedia.org, rID: 29803
Case courtesy of Dr Andrew Dixon, Radiopaedia.org, rID: 9351
C Group
Many different lesions – most on skin
Can subdivide into two broad groups Xanthogranuloma Non-xanthogranuloma
Juvenile Xanthogranuloma
Affects children >> adults Rare: < 1% of all pediatric tumors Single, few, or multiple lesions on skin: yellow papules 0.5-1 cm Often regress spontaneously Long bones are not involved Rarely patients have visceral involvement or disseminated disease Can cause symptoms or death due to local invasion Genetics Localized CGH: chromosomal abnormalities uncommon (~5%) Disseminated CGH: nonspecific chromosomal abnormalities described
1 case with MAPK1 mutation (Oncotarget 8: 46065, 2017)
Mod Pathol 30:1234, 2017
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Juvenile Xanthogranuloma
Immunophenotype CD14+ CD68+ CD163+ Factor XIIIa +/- S-100+ ~20% Fascin+ ~20% CD1a- CD207/langerin -
MAPK Pathway Mutations in Histiocytic Lesions A Unifying Feature in Pathogenesis
LCH = Langerhans cell histiocytosis JXG = Juvenile xanthogranuloma ECD = Erdheim-Chester disease
Hematology Am Soc Hematol Educ Program 2015; 2015:559-564
M Group
Histiocytic sarcoma Interdigitating dendritic cell sarcoma Langerhans cell sarcoma
“…we recommend reusing the old-term malignant histiocytosis, and refer to the phenotype as a subtype.”
Blood 127: 2672, 2016
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Histiocytic Sarcoma Definition and Clinicopathologic Features Definition A malignant proliferation of cells with morphologic and immunophenotypic features of mature tissue histiocytes Epidemiology Median age = 52 y; males = females Subset associated with B-cell lymphoma (transdifferentiation) Rare pts with mediastinal germ cell tumor and isochromosome 12p Presentation Often extranodal (GI tract, skin, soft tissues) Can be nodal or disseminated (“malignant histiocytosis”) Genetics Subset of cases with monoclonal IG rearrangements 40-50% of cases with BRAF V600E mutation Outcome Clinically aggressive; poor response to therapy 60-80% of patients die of disease
2017 WHO book p. 468-470
Histiocytic Sarcoma CD11c
CD163
Histiocytic Sarcoma Immunophenotype
Positive Vimentin S100 (weak or focal), Ki-67 10-20% ZBTZ46 (Mod Pathol 31:1479, 2018)
Variably Positive Fascin
Weakly and variably positive CD45/LCA, CD68, lysozyme
Negative CD1a, CD207/langerin CD21, CD23, CD35, clusterin CD34, myeloperoxidase EMA, keratins, melanoma-associated antigens B-cell and T-cell antigens 2017 WHO book p. 475
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Interdigitating Dendritic Cell Sarcoma
CD163
S100
Interdigitating Dendritic Cell Sarcoma Definition and Clinicopathologic Features
Definition A neoplastic proliferation of spindle to ovoid cells with phenotypic features similar to those of interdigitating dendritic cells Epidemiology Rare Usually adults; males > females Presentation Solitary lymph node involvement most common Can be extranodal or widely disseminated Genetics Subset of cases with monoclonal IGH rearrangements Rare cases reported with BRAF V600E mutation Outcome Clinically aggressive 50% of patients die of disease 2017 WHO book p. 476
Interdigitating Dendritic Cell Sarcoma Immunophenotype
Positive S100 (diffuse and intense), vimentin Ki-67 10-20%
Variably Positive Fascin
Weakly and variably positive CD45/LCA, CD68, lysozyme
Negative CD1a, CD207/langerin CD21, CD23, CD35, clusterin CD34, myeloperoxidase EMA, keratins, melanoma-associated antigens B-cell and T-cell antigens
2017 WHO book p. 476
14 1/18/2019
18 spindle cell melanoma (SCM) and 9 interdigitating dendritic cell sarcoma (IDCS) assessed with a panel of antibodies MUM-1, B-catenin, SOX10, MiTF, p75
Equivalent immunostaining profiles; all SOX10+
“the morphologic and immunophenotypic features of SCM and IDCS appear to be virtually indistinguishable from one another, raising the question as to whether these 2 entities represent a pathobiologically similar or even identical process.”
Am J Surg Pathol 40: 1270, 2016
Cell of Origin/Lineage of Histiocytes FDCs Are Different – Arise from MSC
MSC = mesenchymal stem cell Sem Cell Dev Biol 2018 (in press)
Follicular Dendritic Cell Sarcoma Definition and Clinicopathologic Features Definition A neoplasm with morphologic and immunophenotypic features of follicular dendritic cells Epidemiology Usually adults; males = females Small subset arises in hyaline-vascular Castleman disease Presentation Extranodal 58%, Nodal 31%, both 11% Genetics Subset of cases with monoclonal IGH rearrangements Complex karyotype Mutations in genes that regulate NF-kB pathway 0-20% of cases reported with BRAF V600E mutation Outcome Need to resect completely; +/- XRT or chemotherapy ~1/3 of pts recur locally; ~1/3 distant metastases 2017 WHO book p. 476-479
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Follicular Dendritic Cell Sarcoma Immunophenotype and Electron Microscopy
Positive (often variable/focal) Vimentin CD21, CD23, CD35 CXCL13, clusterin, D2-40, EGFR, fascin Ki-67: 5-25% Weakly and variably positive CD68, EMA, S100 (focal), HLA-DR Negative CD1a, CD207/langerin CD34, myeloperoxidase Keratins, melanoma-associated antigens B-cell and T-cell antigens
Electron microscopy Long cytoplasmic processes; desmosomes 2017 WHO book p. 475-476
Follicular Dendritic Cell Sarcoma Spindled CD35
Follicular Dendritic Cell Sarcoma Epithelioid
CD21
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Inflammatory Pseudotumor-like FDC Sarcoma A Different Disease
Epidemiology Young or middle-aged adults; women >> men
Presentation Spleen or liver; rarely the GI tract
Presentation Asymptomatic or abdominal pain
Immunophenotype and Genetics CD21+ CD23+ Smooth muscle actin +/- Epstein-Barr virus + and monoclonal
Outcome Clinically indolent; often cured by resection but can recur
2017 WHO book, p 478-479
Inflammatory Pseudotumor-like FDC Sarcoma Spleen
Clusterin
EBER
R Group
Rosai-Dorfman disease
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Rosai-Dorfman Disease History Described by Rosai and Dorfman in 1969 Designated as sinus histiocytosis with massive lymphadenopathy Arch Pathol Lab Med 87: 63, 1969 Also described by two other groups: Destombes et al. in ~ 1965 (Bull Soc Pathol Exot 65: 481, 1972) Azoury and Reed in 1966 (N Engl J Med 274: 928, 1966)
Pierre-Paul Destombes, MD Juan Rosai, MD Ronald F. Dorfman, MD
Rosai-Dorfman Disease A Case Report
Richard J. Reed, MD
Azoury FJ, Reed RJ. N Eng J Med 274:928-930, 1966
Rosai-Dorfman Disease Clinicopathologic Features Most cases are sporadic
Rare familial forms H (Faisalabad) syndrome SLC29A3 mutation Autoimmune lymphoproliferative syndrome TNFRSF6 mutation
Presentation ~60% Lymphadenopathy Bilateral large, painless cervical LNs Other lymph node groups can be involved +/- fever, night sweats, weight loss, fatigue
~40% Extranodal sites of disease Sem Diagn Pathol 33:244, 2016
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Rosai-Dorfman Disease Bilateral Cervical Lymphadenopathy is Common
Rosai-Dorfman Disease Lymph Node
Emperipolesis (greek) Em = inside Peri =around Polesis = going about
Extranodal Sites Involved by RDD
Anatomic Site Frequency Nasal cavity and paranasal sinuses 11.3%
Soft tissue 8.9%
Orbit/eyelid 8.5%
Bones 7.8%
Skin 6.8%
Genitourinary system 6.4%
Major salivary glands 5.2%
Central nervous system 4.7%
Oral cavity 2.6%
Lungs, larynx, liver, tonsil, breast, Each < 2% GI tract, thyroid, heart
E. Foucar et al. Semin Diagn Pathol 7:19, 1990
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Rosai-Dorfman Disease Soft Tissue
Emperipolesis is less in RDD at extranodal sites S-100
Rosai-Dorfman Disease Immunophenotype
Positive S100 protein CD68 CD163 Fascin HLA-DR
S100 Negative Beware CD1a IgG4 plasma cells can be CD207/langerin numerous in RDD CD3, CD20
7/21 (33%) cases with KRAS or MAP2K1 mutation Sofia Garces, MD
All point mutations KRAS exon 2 (n=2) or exon 4 (n=2) MAP3K1 exon 1 (n=1) or exon 3 (n=2)
VAF ~ 5%
Mutations correlated with Head and neck site Younger age Multifocal disease
No correlation with outcome
MAP2K1 c.157 T>G p.F53V Mod Pathol 30: 1367, 2017
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Before After
N Engl J Med 377: 2398, 2017
Rosai-Dorfman Disease Associated with Lymphoma
NLPHL
RDD
Age: Median 46 years (23-77) Sex: 7 women; 5 men Site: 11 lymph nodes; 1 skin Size: 3-20 mm Associated lymphomas: 10 Hodgkin lymphoma (6 NLPHL, 4 CHL) 1 CLL/SLL 1 MALT lymphoma Ipox: S100+, cyclin D1+, pERK 6/7+ Genes: No mutations (n=4) Follow up: No impact on therapy Mod Pathol 32: 16, 2019 No RDD elsewhere
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H Group
Hemophagocytic lymphohistiocytosis
Hemophagocytic lymphohistiocytosis (HLH) Definition and Classification Definition A syndrome of severe immune activation and dysregulation characterized by hyperactive macrophages and lymphocytes, proinflammatory cytokine hypersecretion, tissue infiltration, hemophagocytosis, and organ damage. Types of HLH Primary (familial) Genetic defects that impair cytotoxic immune function Secondary Malignant neoplasms Non-malignant Infection Autoimmune disease Following organ transplantation Iatrogenic immune suppression Cancer 123:3229, 2017
Hemophagocytic lymphohistiocytosis Primary
Epidemiology Most patients are young children Incidence is 1 in 50,000-100,000 live births Genetics Biallelic mutations in genes that encode for molecules involved in cytotoxic granule activation, fusion, function, etc. Examples: PRF1 (perforin), STX11 (syntaxin 11), SH2D1A (XLP) Mendelian inheritance for many of these genes Survival Median = 2 months without treatment Therapy Etoposide, dexamethasone, and intrathecal methotrexate Allogeneic stem cell transplantation
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Hemophagocytic lymphohistiocytosis Secondary Epidemiology Most patients are adults Malignant neoplasms are usually hematologic Lymphomas, acute leukemias, MDS, T/NK-cell neoplasms Infection EBV, CMV, bacteria, fungi, protozoa Autoimmune (AKA macrophage activation syndrome) Systemic lupus erythematosus, juvenile RA, polymyositis Organ Transplantation Stem cell or solid organ Mortality Rate 80% Therapy Treat the neoplasm Suppress immune activation
Hemophagocytic lymphohistiocytosis Criteria for Diagnosis
1. Fever 2. Splenomegaly 3. Cytopenias affecting >2 cell lineages 4. Elevated triglycerides and/or hypofibrinogenemia 5. Hemophagocytosis in bone marrow, spleen, or lymph nodes 6. Low or absent NK-cell activity 7. Elevated serum ferritin 8. High levels of soluble IL-2 receptor alpha
5 of 8 criteria are required to establish diagnosis of HLH Genetic testing, if positive, trumps
One can establish a diagnosis of HLH without morphologic evidence
Pediatr Blood Cancer 48:124, 2007
Hemophagocytic lymphohistiocytosis Secondary to EBV Infection
LN Patient with mantle cell lymphoma who died of HLH
Spleen
EBER
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Secondary Hemophagocytic lymphohistiocytosis Bone Marrow
Often easier to find HLH in smear than in biopsy
Paul Langerhans 1847-1888
Paul Langerhans Circa 1867
Paul and Margarethe Langerhans Grave site on Madeira Island 1885
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