ewings sarcoma_utsav
TRANSCRIPT
EWING’S SARCOMA
By : Dr. Utsav Agrawal
IntroductionEwing, in 1921 described it as a tumor occuring in
the diaphysis of long bone, in children, asso. With febrile attacks , anorexia and anaemia and which was radio-sensitive.
He believed it arose from endothelial elements of bone marrow and described it as diffuse endothelioma of bone
Willis found rosette formation and presence of primary lesion, usually in adrenals, in many cases
Ewings sarcoma is thought to be of either neuro-ectodermal or stem cell origin
All Ewings sarcoma’s are considered high grade malignancy and categorized under Enneking Stage II or III
Epidemiology9% of primary bone sarcomas4th most common primary malignancy of bone but
2nd most common below 30yrs and most common below 10 yrs of age.
Age Group – 95% patients age between 5 to 30 yrs- of these most range between 5 to 15 yrs
• Sex - slight male prediliction – 60%• More common in Whites (95%)• No known predisposing factor• Chromosomal translocation – t(11;22)(q24;q12) leading to fusion of EWS and FLI gene. also t(21;22) and t(7;22)
Clinical FeaturesPainSwellingFeverWeight lossAnemiaRaised ESR and CRPLeukocytosisAnd, symptoms depending on area of
involvement
LocationCan develop in any bonePrincipally affects the lower segment of the skeleton in
more than 2/3 casesIn long tubular bones – proximal segment more
frequently involved than distal fragment (5:1 to 3:1) Usually of diaphyseal origin. Sometimes dia-metaphyseal. Rarely, metaphyseal.In vertebrae, most commonly involved – Sacrum Body is mainly affected with subsequent involvement of intra and para-spinal tissues and posterior elements mostly metastatic.• Rarely may be localized to soft-tissue or peri-osteum.
10%
22 %
11%
F - 9%
8
126
1
3%
RadiologyOn Plain X-ray – In long bones- Diaphyseal/metadiaphyseal Cortical erosion Periostitis Soft-tissue mass Osteolysis Aggressive nature with permeative/moth-eaten type of bone
destruction Peri-osteal response – may be lamellated (‘onion-skin’) or
hair-0n-end Cortical changes – longitudinal cross striations, tunnelling
and saucerization. Occasionally, osteosclerosis and pathological fractures
Hair-on-end periosteal reaction
Onion skin formation
Metatarsal involvement with moth-eaten appearance, periostitis Involvement of long bone with
lamellated appearance, saucerisation, cortical breach, periostitis
Ewings sarcoma with extensive soft tissue involvement
In Vertebrae – OsteolysisFracturesVertebra planaExtension to posterior segmentSoft tissue mass• In RibsOsteo-lytic/sclerotic/bothDirection of growth usually intrathoracicLarge extra-pleural mass
• Metastasis – Usually to Lungs(m.c.) and Bones.
• Bone Scan - uptake - rarely cold spots• Gallium scan• CT scan – For extra-osseous and trans-articular spread - for chest metastasis - evaluation of response to therapy• MRI – for extra-osseous and intramedullary extent of
lesion - metastasis - pre-operative planning ( along with MR-angio) - response to therapy• PET scan• Biopsy
Histo-pathologyDiaphyseal/dia-metaphysealPredominantly medullary, then extends to
haversian system and cortexGreyish-white to pink in colorsoft, friableOften of semi-liquid consistencyAreas of hemorrhage, necrosis and cyst
formation presentOnion-skin periosteal reaction
MicroscopySmall round undifferentiated tumor cells with little
cytoplasm and indistinct bordersRound nuclei with stippled evenly distributed powder-
like chromatin and 1-2 nucleoliFrequent mitosisNecrosis and Ghost cellsMinimal inter-cellular substanceRosette and psuedo-rosette formationPeritheliomaNO GIANT CELLSPAS +ve presence of glycogenReactive for vimentin
Ewings Family of Tumors1. Ewings2. PNET3. AskinsSimilarity between Ewings and PNET• C/f, radiology, light microscopy• Chromosomal translocation t(11:22)(q24:q12)• Reactivity towards p30/32 MIC-2 in 90%Differences : In PNET• More frequent epiphyseal involvement, Pathological fractures,
metastasis• Rosette formation• Electron microscopy – features of neural differentiation like dendritic
processes, abundance of cytoplasmic granules, intermediate filaments, neurosecretory granules and microtubule formation.
• Immunohistochemistry - +ve for neural markers – S-100, synaptophysin, NSE, neuro-filament protein.
Differential diagnosisOsteosarcomaLymphomaLeukemiaOsteomyelitisPNET
Prognostic factorsGood prognosis in – involvement of distal segment of extremities No metastasis Infants and young children FemalesPoor prognosis – Proximal segment involvement Sacral involvement Patients above 18 yrs LDH and ESR
Enneking system for malignant tumors
Stage Grade Site Metastasis
IA Low G-1 Intracompartmental T1
-
IB Low G-1 Extracompartmental T2
-
IIA High G-2 Intracompartmental T1
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IIB High G-2 Extracompartmental T2
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III Any G Any T Regional/ distant metastasis
TreatmentGoal – To eliminate tumor mass, prevent recurrence
and preserve functionDepends on Stage at presentation and Location of
lesionModalities of treatment – Chemotherapy, Surgery and
radiotherapyChemotherapy alone, as adjuvant or neo-adjuvant to
surgical excision or debulkingDrugs used – Vincristine, Actinomycin-D,
Cyclophosphamide ( VAC regimen)Also used - Doxorubicin, etoposide, ifosphamideRadiotherapy - Generally, a dose of 45-50 Gy is
administered over a 5 week course to treat local disease.
Newer TherapiesNutlin – 3a MDM-2 antagonistFigitumumab – antibodies against IGF-R1mTOR inhibitors – everolimus, rapamycinRetinoids – FenretinideBiphosphonatesTRAIL receptor agonistsGene therapy
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