Clusterin Expression Distinguish Foll icular Dentritic Cell Tumor From Ot her Dentritic Cell Neoplasm: Report of a Novel Follicular Dentritic Cel l Marker and Clinicopathologic Data on 12 Additional Follicular Dentrit ic Cell Tumors and 6 Additional Int erdigitating Dentritic Cell Tumors ~2004AJSP August
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Clusterin Expression Distinguish Follicular Dentritic Cell Tumor From Other Dentritic Cell Neoplasm: Report of a Novel Follicular Dentritic Cell Marker.
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Clusterin Expression Distinguish Follicular Dentritic Cell Tumor From Other Dentritic Cell Neoplasm: Report of a Novel Follicular Dentritic Cell Marker and Clinicopathologic Data on 12 Additional Follicular Dentritic Cell Tumors and 6 Additional Interdigitating Dentritic Cell Tumors ~2004AJSP August
Background(1)
• Tumor of dendritic cell lineage, including follicular dendritic cell tumor(FDCTs), interdigitating dentritic cell tumor(IDCTs) and Langerhans cell histiocytoses(LCH), are rare
• Share IHC positive for fascin, CD68 and many morphologic features
Background(2)
• CD21, CD23, CD35,CD1a and S100 distinguish them
• D/D FDCTs and IDCTs is of clinical importance
• CAN.42, Ki-FDC1p, Ki-M4p, R4/23 and desmoplakin
Clusterin(1)
• Expression in benign follicular dendritic cell
• Clusterin glycoprotein expressed in parenchyma cells of liver, stomah and brain
• Expression in anaplastic large cell lymphoma, diffuse large B cell lymphoma, peripheral T-cell lymphoma, nodular sclerosis Hodgkin lymphoma, ca of breast, colon, pancreas, and prostate
• Expression on dentritic cell tumor has not previously been reported
• Substantial number
Material and method(1)
• Mayo Clinic in-house and consutation file, 1995~2003
• Clusterin diffuse strong cytoplasmic staining in all FDCT
• Majority of FDCT showed positive for one or more of the tranditional FDC marker
• CD1a and S-100 were negative in all FDCT
• CD68 and fascin were positive in the majority
IHC(2)
• 2 case of FDCTs were negative of CD21,CD23 and CD35, were classified as FDCT by EM
• Negative for actin, desmin, ALK-1, CK, CAM5.2
• Both show positive for EMA
IHC(3)
• IDCT: negative or showed only focal weak positive for clusterin
• All IDCT were strongly positive for S-100, fascin and negative for CD1a, CD21,CD35
• Subset case shows CD23 and CD68 positive
IHC(4)
• 6/14 LCH complete negative for clusterin and 8 cases showed variable positive
• All LCH were positive for CD1a, fascin and CD68
• S-100 showed variable intensity in 13 cases• CD21,CD35 were negative in all cases• CD23: equivocal in 9 cases
IHC(5)
• 6 spindle cell tumor, NOS: all showed some degree of fascin,
• 2 showed strong culsterin in the minor subset of cells
• Others: negative
EM(1)
• Were performed in selected case( 3 FDCTs and 2 IDCTs)
• FDCT: long interwining process connected by well-formed desmosome
• IDCT: complex interdigitating process without intercellular junction, variable number of lysosome and intermediate filament
EM(2)
• Unclassifiable spindle tumor: nonspecific features that lack membrane interdigitating process, intercellular junction, dense bodies and basal lamina
Clinical feature(1)
• Follow-up clinical information was available in 9 FDCT(M: 58.4 m)
• 4 achieved apparent cure
• meta was noted in 5 cases
• None of the patient with FDCT is known to have died
Clinical feature(2)
• IDCT occurred in older adult
• Four presented with solitary LN(+)
• Follow up clinical information was avaiable in 5 IDCT cass
• Three achieved apparent cure
• Two presented with disseminated dx and progressed rapidly to death from their dx
Clinicopathological Correlation
• No apparent correlation of behavior of FDCT or IDCT with mitotic activity, necrosis, degree of atypia or tumor location
• The two very aggressive IDCT had very similar histiocyte-like morphology and CD68(+) that was distinct from the other three cases
Discussion(1)
• The distinction of FDCT from other subtypes of dendritic cell tumor and other spindle cell tumor requires a panel of IHC stain(CD21, CD23, CD35, S-100, CD1a, CD68, actin, desmin and CK)
• we demonstrate the additional marker, clusterin, increases the diagnostic sensitivity
Discussion(2)
• Strong clusterin staining also distinguishes FDCTs from other dendritic cell neoplasm
• Robust clusterin staining is useful as supportive evidence for FDCT in cases with weak or focal expression of the extablished FDC markers
Discussion(3)
• CD21 is thought to be the most reliable FDC marker with a sensitivity of 96%
• Weak and focal staining is a particular problem in hepatosplenic FDCT cases with an inflammatory pseudotumor-like morphology
• Some have used CD21and CD35 cocktail or additional marker(Ki-FDC1p, Ki-M4p, CAN.42, R4/23)
Discussion(4)
• In addition to be a supplemental marker, clusterin staining can help classify FDCT that is completely devoid of staining for these traditional marker
• Strong clustrin expression shows specificity for FDCTs among dendritic cell tumor
Discussion(5)
• IHC finding on 6 spindle cell tumor, NOS suggest that clusterin may not be entirely specific for FDCTs among all spindle cell tumor
• The clinical finding in our cases supplement previous report, behave as low gr sarcoma, with tendency for local recurrence and late metastases, some with castleman dx
Discussion(6)
• Attempt to correlate clinicopathologic parameterw with clinical outcome have been limited by the rarity of the tumor
• One previous study of 17FDCTs found a statistically significant correlation between intraabdominal location, significant pleomorphism and a worse outcome
Discussion(7)
• IDCTs display a variable behavior from benign to rapidly fatal dx
• No apparent association between mitoses, necrosis, nuclear pleomorphism or extranodal location
• It’s interesting to speculate that IDCTs displaying more histiocytic differentiation may be associated with more aggressive behavior
Conclusion
• IHC for clussterin is of significant utility in diagnostic evaluation of dendritic cell tumor
• Strong clusterin stain appears to be a highly sensitive marker of FDCT
• Additional study is needed to delineate the specificity of clusterin expression among a broader spectrum of sarcoma and other spindle cell tumor