bone sarcoma€¦ · journal of the royal college of surgeons of edinburgh 1955 radiotherapy for...
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esmo.org
BONE SARCOMA
Stefan Bielack
Cooperative Osteosarcoma Study Group COSS
Klinikum Stuttgart – Olgahospital
Pädiatrie 5 (Onkologie, Hämatologie, Immunologie)
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„If you do not operate, they die.
If you do operate, they die just the same.
Gentlemen, this meeting
should be concluded
with prayers.“
Sir Stanford Cade(1895–1973)
Problem 1: Tumor Growth Problem 2: (Lung) Metastases
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Bone Sarcoma: Current Therapeutic Strategies
Ewing Sarcomastandard approach
imaging/biopsy
neoadjuvant chemotherapy
surgery/radiotherapy
adjuvant chemotherapyprim. pulm. mets: plus
(surgery), adjuvant lung RT? HDT?
VCR
IFO/CYC
DOX
ActoDETO
Osteosarcomastandard approach
imaging/biopsy
neoadjuvant chemotherapy
surgery
adjuvant chemotherapyplus surgery for primary mets
ADR
DDP
MTX
IFO
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Osteosarcoma
WHO classification 2013
• Conventional
- chondroblastic
- fibroblastic
- osteoblastic
- various unusual subtypes
• Teleangiectatic
• Small cell
• High grade surface
• Parosteal
• Periosteal
• Low grade central
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OsteosarcomaEpidemiology
incidence: 2-3/million/year
age: adolescence
sex: m:f ca. 1.4:1
site: metaphyses of long bonesdistal femur, prox. tibia, prox. humerus, prox. fibula
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Osteosarcoma
Incidence peaks in AYA
Studies performed in AYA
Knowledge derived from AYA
Benchmark for outcomes = AYA
Best served population = AYA (?)
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Adult vs. pediatric osteosarcoma
Adult vs. pediatric osteosarcoma
Proportion of axial tumors higher
Adult vs. pediatric osteosarcoma
More „secondary“ osteosarcomas
primary
with Paget‘s
all
≥2nd cancer
More axial More secondary
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• the same treatment principles should apply
but
• adults don‘t tolerate pediatric protocols
„Adult“ vs. „pediatric“ osteosarcoma
Treatment - Assumptions
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„Adult“ vs. „pediatric“ osteosarcomaAdults don‘t necessarily experience more toxicity!
• Grade 3 or 4 thrombopenia children > adolescents/adults
• Grade 3 or 4 neutropenia children > adolescents/adults
• Grade 3 or 4 mucositis no age related difference
• Death due to toxicity children > adolescents/adults
=> „true“ or- less intensive treatment?- reporting bias?
4.403 patients≤ 50 years
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„Young“ adults 18-40Treatment usually feasible (MTX?)
„Older“ adults > 41-65(Modified) chemo feasible, but rather toxic (EURO-B.O.S.S.)
„Very old“ adults 65+Little data - chemo probably even more toxic
- probably often not feasible
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4.403 patients≤ 50 years
Osteosarcoma: Overall Survival
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years
302520151050
surv
ival
1,0
0,8
0,6
0,4
0,2
0,0
localized extremity
axial or / and primary metastatic
localized limb (n=2,017)
axial or metastatic (n=444)
Bielack et al., Cancer Treat Res 2009; based on n= 2,464 COSS osteosarcomas
Osteosarcoma: Overall Survival
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Is imaging sensitive and specific?
Osteosarcoma Metastases
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Osteosarcoma: Chest-CT
Lesion-size not sufficient to distinguish mets
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Osteosarcoma: Chest-CT
Mets may present atpically
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CT finds small lesions,
but is non-specific
Met No mets
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Osteosarkom
(Pulmonale) Primärmetastasen
V. a. Knochensarkom Why is reliable detection of primary (lung) mets so important?
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Osteosarcoma- primary metssurgery & survival
COSS: Kager et al., J Clin Oncol 2003
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Chest-CT• is the best available technique
• is not particularly specific < 0,5-1 cm • others, specifically PET, add little
• chest-MRI remains investigational
„Small“ nodules
Only limited correlation between imaging and „true“ metastases:
any small lesion might be a met or something else
if in doubt, get it out
Osteosarcoma (Lung-)Metastases
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OsteosarcomaStandard approach – since early/mid 1980s
imaging/biopsy
neoadjuvant chemotherapy
surgery
adjuvant chemotherapy
plus surgery for primary mets
HD-MTX
ADR (=DOX)
DDPIFOS???
benefit of additional agents ??????
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SURGERY OF THE PRIMARY TUMOR:
WHEN ?
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n 5-year EFS p
POG*
delayed 45 61% .8
immediate 55 69%
COSS**
delayed 1,451 54.4% .404
immediate 157 59.9%
*prospective, localized extremity osteosarcoma. Goorin et al., J Clin Oncol 2003
**retrospective, loc. or metastatic, limb or trunk. Bielack et al., J Clin Oncol 2002
=> similar prognosis (with identical chemo)
Timing of surgery & event-free survival
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SURGERY OF THE PRIMARY TUMOR:
WHICH TECHNIQUE ?
Surgical margins (Enneking et al., 1981)
radical
wide
marginal
intralesional
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Osteosarcoma: Type of surgery(COSS, >2.800 extremity osteosarcomas)
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Is limb-salvage always the best option?
An open question!
Extremity functionBetter after limb-salvage than after amputation (not: rotation plasty)
Some limb-salvage drawbacksLocal recurrence risk
More long-term pain
Higher complication rate
More revisions (more hospital episodes, secondary amputations)
Some reassuring wordsMost patients adjust well to either type of surgery
QoL often rather good
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Journal of the Royal College of Surgeons of Edinburgh 1955
Radiotherapyfor inoperable osteosarcoma?
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Osteosarcoma local therapyTake home messages
• operate, operate, operate!
• limb salvage is often feasible
• local recurrence risk can be reduced- by good imaging- by smart planning- by good chemo- by good surgery
• radiotherapy may be an option for selectedinoperable lesionsstudies with proton / heavy ion radiotherapy ongoing
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Are things getting
better?
4.403 patients≤ 50 years
Osteosarcoma: Overall Survival
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0
10
20
30
40
50
60
70
1978-1982 1983-1987 1988-1992 1993-1997
Osteosarcoma: 5-year survival rates
0
10
20
30
40
50
60
70
1973-1978 1984-1993 1994-2003
Stiller et al., Eur J Cancer 2006 Mirabello et al., Cancer 2009
Europe (EU & others) North America
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MTX DOX DDP IFO
Does it matter how many
of these drugs are used?
Osteosarcomastandard approach
imaging/biopsy
neoadjuvant chemotherapy
surgery
adjuvant chemotherapyplus surgery for primary mets
ADR
DDP
MTX
IFO
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Might results be improved by
increasing dose or dose-
intensity?
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n(risk)Regimen 1245 (50) 169 (39) 93 (8) 45 (1) 21Regimen 2252 (44) 175 (41) 98 (7) 58 (3) 18
0.0
0.2
0.4
0.6
0.8
1.0
Propor
tion ali
ve
0 24 48 72 96Time from randomisation (months)
CDDP+Dox CDDP+Dox+GCSF
All patients and timed from randomisation
KM plot of overall survival
n(risk)Regimen 1245(64)169(46)112(17) 82 (2) 68 (5) 49 (1) 32 (0) 21Regimen 2252(55)185(56)117(15) 91 (5) 76 (4) 55 (1) 45 (0) 30
0.0
0.2
0.4
0.6
0.8
1.0
Ppn ali
ve and
progr
ession
-free
0 12 24 36 48 60 72 84Time from randomisation (months)
Regimen 1 Regimen 2
All patients and timed from randomisation
KM plot of progression-free survival
MRC BO06 EORTC 80931
EOI: Lewis et al., JNCI 2007
G-CSF?
+ -
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Osteosarcoma:
Dose / Dose-Intensity
• importance remains unproven
G-CSF for interval compression
• not useful
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biopsy surgical specimen
Response to preop chemo
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years
302520151050
surv
ival
1,0
0,8
0,6
0,4
0,2
0,0
grade 1
grade 2
grade 3
grade 4
grade 5
grade 6
Salzer-Kuntschik Grades
Osteosarcoma: Response & Survival
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Can outcomes be improved for poor responders?
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COG Childrens’ Oncology Group
COSSCooperative Osteosarcoma Study Group
EOIEuropean Osteosarcoma Intergroup
SSGScandinavian Sarcoma Group
European and American Osteosarcoma Study
COG Childrens’ Oncology Group
COSSCooperative Osteosarcoma Study Group
EOIEuropean Osteosarcoma Intergroup
SSGScandinavian Sarcoma Group
European and American Osteosarcoma Study
eligible:
≤40 yearsat osteosarcoma diagnosis
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Design and eligibility
Biopsy-proven diagnosis of resectable osteosarcoma
REGISTER
MAP (induction)
Surgery
Histological response assessment
Poor Good
RANDOMIZE RANDOMIZE
MAP MAPIE MAP MAPifn
Registration
• Resectable high-grade osteosarcoma
• Extremity or axial
• Localized or metastatic
• Age ≤40yr
• No pretreatment for osteosarcoma
• No previous chemo for any disease
• No contraindication to treatment
• Registration & chemo ≤30day after biopsy
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EURAMOS1-POOR RESPONSE: Design
Primary tumor
resectionRAP MM
IE M
A MM
wk 1-10 wk 11
wk 12-40
Ai M
wk 12-29
x2
AP MM A MMAP MM
AP MM IE M AP MM IE M Ai MM
MAPIE
MAP
Induction MAP
Poor Response
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Poor Response - MAPIE vs. MAP
55% (49%-60%)
53% (46%-58%)
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MAPIE more toxic than MAP
• Grad III/IV non-hematological toxicity
p=0.0024
• Secondary leukemia
8/307 vs. 2/308
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EURAMOS-1 Poor Response : Conclusion
◆ Adding ifosfamide and etoposide to
MAP is associated with additional
morbidity and has no effect on
survival outcomes.
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Might results be improved by
bisphosphonates?
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Zoledronate added to chemo:
Randomized French trial suggests potential inferiority!
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Might results be improved by
“immunotherapy”?
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Design and eligibilityRandomization
• Good response
• <10% viable tumor
• Assessment by reference pathologist if possible
• Age ≥ 5 yrs
• No disease progression
• If mets, complete removalfeasible
• Recovery from prior therapy
• Randomization ≤ 35 days post-op
Biopsy-proven diagnosis of resectable osteosarcoma
REGISTER
MAP (induction)
Surgery
Histological response assessment
Poor Good
RANDOMIZE RANDOMIZE
MAP MAPIE MAP MAPifn
Design and eligibility
Randomization
• Good response • <10% viable tumor
• Assessment by reference pathologist if possible
• Age ≥ 5 yrs
• No disease progression
• If mets, complete removal feasible
• Recovery from prior therapy
• Randomization ≤ 35 days post-op
• Written informed consent
Biopsy-proven diagnosis of resectable osteosarcoma
REGISTER
MAP (induction)
Surgery
Histological response assessment
Poor Good
RANDOMIZE RANDOMIZE
MAP MAPIE MAP MAPifn
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0.00
0.25
0.50
0.75
1.00
Pro
porti
on e
vent
-free
356 323(25) 235(41) 184(9) 112(4) 62(0) 22(2)MAPifn
358 318(32) 231(38) 167(13) 106(5) 58(3) 8(1)MAP
N
0 12 24 36 48 60 72
Time from randomisation (months)
MAP MAPifn
intention-to-treat population
Event-Free Survival - Good Responders randomisation
EFS - intention to treat
74% at 3yr
77% at 3yr
MAP (n=358) MAPifn (n=357)
Events, n (%) 93 (26%) 81 (23%)
3 year EFS 74% (69%-79%) 77% (72%-81%)
Hazard ratio* (95%CI)p-value
0.82 (0.61-1.11) p=0.201
*Cox model adjusted for data center, metastases status, site and location of tumor on bone
0.00
0.25
0.50
0.75
1.00
Pro
porti
on e
vent
-free
356 323(25) 235(41) 184(9) 112(4) 62(0) 22(2)MAPifn
358 318(32) 231(38) 167(13) 106(5) 58(3) 8(1)MAP
N
0 12 24 36 48 60 72
Time from randomisation (months)
MAP MAPifn
intention-to-treat population
Event-Free Survival - Good Responders randomisationEFS - intention to treat
74% at 3yr
77% at 3yr
MAP (n=358) MAPifn (n=357)
Events, n (%) 93 (26%) 81 (23%)
3 year EFS 74% (69%-79%) 77% (72%-81%)
Hazard ratio* (95%CI)p-value
0.82 (0.61-1.11) p=0.201
*Cox model adjusted for data center, metastases status, site and location of tumor on bone Bielack et al., J Clin Oncol 2015
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0.00
0.25
0.50
0.75
1.00
Pro
port
ion
star
ted
Ifn
353 132(219) 79(51) 72(0) 62(1)
N
0 6 12 18 24months from randomisation
cumulative incidence
Time from randomisation to starting interferon
Starting interferon
82 (23%) report never starting,
→ main reason is refusal (63)
271 (76%) report starting ifn
Median start = 5.4 months (95% CI 5.2-5.5)
4 no ifn data yet
0.00
0.25
0.50
0.75
1.00
Pro
porti
on s
till o
n in
terfe
ron
270 202(67) 163(24) 39(116) 8(26) N
0 6 12 18 24months from starting ifn
Time from starting to stopping Ifn
Duration of interferon
Median duration ifn14.9 mo (IQR 4.6-15.1)
234/271 stopped ifn
- 128 (55%) completed ifn
- 106 (45%) terminated early
44 Toxicity
25 Progression
17 Refusal
20 Other
- 37 still on ifn at data freeze
Interferon treatment
Bielack et al., J Clin Oncol 2015
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EURAMOS-1: Conclusions
◆ Evidence from EURAMOS-1 does NOT
support adaptation of postoperative
chemotherapy based on histological
response!
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Liposomal muramyl-triphospate-ethanolamine L-MTP-PE• Macrophage activator derived from mycobacterial cell wall
• Preclinical testing in animals (dogs)
• Phase 2: macrophage infiltration into osteosarcoma mets
better survival than historical controls?
toxicity: mainly fever, chills etc.(Kleinermann et al. J Clin Oncol 10:1310-1316, 1992)
Prospective, randomized clinical trial POG/CCG INT01332 x 2 factorial design (+/- IFO, +/-MTP):
Preop Postop
A- DOX, MTX, DDP DOX, MTX, DDP,
A+ DOX, MTX, DDP DOX, MTX, DDP, MTPx48
B- DOX, MTX, IFO DOX, MTX, IFO, DDP
B+ DOX, MTX, IFO DOX, MTX, IFO, DDP, MTPx48
no preop DDP
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INT 0133 Meyers et al., J Clin Oncol 26:633-638, 2008
n = 662 localized resectable osteosarcoma; end points EFS & overall survival
EFS overall survivalregimen 4-year 6-year 4-year 6-year
A- - 66% 64% 78% 71%
A+ MTP 65% 63% 82% 75%
B- IFO 60% 58% 77% 70%
B+ IFO, MTP 74% 71% 86% 81%
EFS overall survivalregimen 4-year 6-year 4-year 6-year
A-/B- no MTP 63% 61% 78% 70%
A+/B+ MTP 69% 67% 84% 78%
no statistical evidence of interactionproportional hazards regression analysis P =.102 (EFS), .60 (overall survival)
p=.08 p=.03
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MTP: Regulatory situation
• MTP not licensed
• MTP licensed for nonmetastatic osteosarcoma
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MTP
Interpretation by EURAMOS Group
Efficacy data not sufficient
=>
Not a part of standard osteosarcoma
treatment
….but some others seem to see things differently
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Ewing Sarcoma• Third most common bone sarcoma
• Age
Adolescence< 15 J. ca. 2 / Mio / yr
15-19 J. ca. 5 / Mio / yr
• m > f 1.5:1
• Ethnicity
rare in Asians, AfricansAbb. aus: Arndt & Crist, N Engl J Med 1999
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Ewing Sarcoma ((EI)CESS 81-92)
Overall and Event-Free Survival
EFS
3y.: 0.655 +/-.0365
5y.: 0.619 +/-.0372
10y.: 0.589 +/-.0382
OAS
3y.: 0.771 +/-.0331
5y.: 0.696 +/-.0336
10y.: 0.644 +/-.0338
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EWS/ERG EWS/FLI1
Prognostic importance of translocation-type?
From: Bielack et al, New Engl J Med 2004
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Conclusion:
differences of EWS-FLI1 fusion architecture
• not useful
as independent prognostic markers
with current treatment regimens
n = 565 n = 119
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Not everything that looks somewhat like Ewing is Ewing
Undifferentiated small round blue cell “EWSR1-negative Ewing’s-like tumors’
• CIC-DUX4t(4;19) or t(10;19); soft tissue tumors
•BCOR-CCNB3 X-chromosomal paracentric inversion; bone and soft tissue tumors
• CIC-FOXO4 t(X;19); FUS-NCATc2 and many others and (much) more to come
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Patients (n=26)
Age: median 13.1 years (5.9-25.6)
17 male, 9 female
21 bone, 5 soft tissue
2/26 lung mets at diagnosis
Immunohistochemistry
Cyclin B3+
Treatment
24/26 chemo (mostly Ewing-like)
22/26 surgery (+/- RT), 2/26 RT only
Outcome
16/26 alive in CR (mean FU 86 mo)
5 year OS/EFS 77%/68%
BCOR-CCNB
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Patients (n=7)
Age: median 33 years (15-44)
6 soft tissue, 1 bone
5/7 lung mets at diagnosis
Morphology
Undifferentiated round-cell,
more atypia & pleomorphism than Ewing
Immunohistochemistry
7/7 focal & weak CD99+; 5/7 WT1+
Outcome
6/7 died (mean 14.5 months from diagnosis)
CIC-DUX4
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Can the outlook for patients with Ewing
Sarcoma be improved by treatment
intensification?
Ewing Sarcoma ((EI)CESS 81-92)
Overall and Event-Free Survival
EFS
3y.: 0.655 +/-.0365
5y.: 0.619 +/-.0372
10y.: 0.589 +/-.0382
OAS
3y.: 0.771 +/-.0331
5y.: 0.696 +/-.0336
10y.: 0.644 +/-.0338
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Ifo vs. CYC
+/- etoposide
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HR-group: Etoposide?
YES (EVAIA)
NO (VAIA)
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49 weeks of
standard chemotherapy
doxorubicin, vincristine, cyclophosphamide, dactinomycin
or experimental therapy
with these four drugs alternating with courses of
ifosfamide and etoposide
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p=0.005
metastatic
localized
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Conclusion:
treatment intensification / diversification
• beneficial in localized (HR) disease
• not beneficial for metastatic disease
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73%
65%
p=.048
83%
77%
p=.056
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EURO-E.W.I.N.G. 99
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Inclusion criteria
localized tumors with either
- good histologic response to induction chemo (< 10% cells) or
- small tumors (< 200 mL) resected at diagnosis or receiving
radiotherapy alone as local treatment.
Chemo
6 VIDE+1 VAI =>
- 7 VAC with 1.5 g/m² CYC versus
- 7 VAI with 6 g/m² IFOS
Le Deley et al., J Clin Oncol. 2014 Aug 10;32(23):2440-8
EURO-E.W.I.N.G. 99 - R1
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EURO-E.W.I.N.G. 99 - R1
Le Deley et al., J Clin Oncol.
2014 Aug 10;32(23):2440-8
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….HDT-PBSCTorconventional chemofor• localized HR-disease?• primary pulm. mets?
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EE99-R2Loc Scheme
L
O
C
A
L
T
H
E
R
A
P
Y
VIDE VIDE VIDE VIDE VIDE VIDE VAI R
VAI VAI VAI VAI VAI VAI VAI VAI
BuMel
BuMel:Busulfan-Melphalan x 1 with stem cell rescue
VAI: vincristine actinomycin D, ifosfamide x 7
Presented by: Jeremy Whelan, ASCO 2016
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Benefit of BuMel on Event-Free Survival
VAI, 3-y EFS=53%
BuMel, 3-y EFS= 67%
ITT analysis
Benefit largely related to prevention of metastasesmetastases
HR = 0.64 (95%CI, 0.43-0.94)p= 0.024
Cumulative incidence of metastases (competing risk approach)
HR = 0.59 (95%CI, 0.38-0.92)p= 0.02
Presented by: Jeremy Whelan, ASCO 2016
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Benefit of BuMel on Event-Free Survival
VAI, 3-y EFS=53%
BuMel, 3-y EFS= 67%
HR = 0.64 (95%CI, 0.43-0.94)p= 0.024
ITT analysisTranslates into better Overall Survival
HR = 0.60 (95%CI, 0.39-0.92)p= 0.019
VAI, 3-y OS=70%
BuMel, 3-y OS= 78%
Presented by: Jeremy Whelan, ASCO 2016
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Ewing Sarcoma (EI)CESS 81-92
Primary metastases & survival
none
Lung
Bone/bone marrow
R3
image courtesy of H. Jürgens & M. Paulussen
R2pulm
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Randomization in R2pulm
R 2 VIDE x 6
VAI x 7& Whole Lung
Irradiation
(WLI)
BuMel HD x 1
VAI x 1
Randomisation
L
O
C
A
L
T
H
E
R
A
P
Y
VAI x 1
ASCO 2016, presented by Uta Dirksen
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No Benefit of BuMel on Event-Free Survival
VAI+WLI, 3-y EFS=51%
BuMel, 3-y EFS= 55%
ITT analysis
HR = 0.82 (95%CI, 0.58 – 1.15)p= 0.24
Secondary metastases
Cumulative incidence of secondary metastase
(competing risk approach)
HR = 0.79 (95%CI, 0.54-1.15)p= 0.22
ASCO 2016, presented by Uta Dirksen
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No Benefit of BuMel on Overall Survival
VAI+WLI, 3-y EFS=51%
BuMel, 3-y EFS= 55%
ITT analysis
HR = 0.82 (95%CI, 0.58 – 1.15)p= 0.24
No benefit on Overall Survival
HR = 0.96 (95%CI, 0.65 – 1.40)p= 0.82
VAI+WLI, 3-y OS=68%
BuMel, 3-y OS= 68%
ASCO 2016, presented by Uta Dirksen
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EURO-E.W.I.N.G. 99
R 3 – Treatment schedule
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Outcome in the unselected patients with primary disseminated multifocal Ewing sarcomas.
Ladenstein R et al. JCO 2010;28:3284-3291
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Ladenstein R et al. JCO 2010;28:3284-3291
©2010 by American Society of Clinical Oncology
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Outcome according to risk groups
Ladenstein R et al. JCO 2010;28:3284-3291
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Does local treatment helpin this dismal situation?
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none
either / or
both
Local treatment:Primary tumor & metastases
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Conclusion:
• Think about local therapyeven in (widely?) metastatic disease
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….
VDC/IE(interval compressed?) orVIDE ???
please wait for the results of the prospective, randomized EEC trial
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Thank you, now your tricky
questions please!.
Stefan Bielack
11.05.2018A very big „Thank you“to Uta Dirksen and Jeremy Whelan for letting me use their ASCO 2016 EE99-R2 slides!
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Osteosarcoma
Is (early) detection of
recurrence
worthwhile? –
and, if yes, how?
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Osteosarcoma recurrence (COSS, n=576)
Survival
0 5 10 15 20
years
0,0
0,2
0,4
0,6
0,8
1,0
surv
ival
1
2 345
Bielack et al., J Clin Oncol 2009
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Surgery is essentialif a 2nd CR can be achieved
Surgery, CR2 n=275
8%
71%
18%p=.038
p<.001
Surgery, no CR2 n=95
No surgery n=53
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years since relapse
20181614121086420
surv
ival 1,0
,9
,8
,7
,6
,5
,4
,3
,2
,1
0,0
Recurrent Osteosarcoma
Pleural Disruption
no pleural disruption
p<.0001
7% Kempf-Bielack2005
pleura disruptedby lung mets (n=66)
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Osteosarcoma: Relapse detectioncorrelates with prognosis – true effct or lead time bias?
Signs & n=105symptoms
Radiology n=301(routine follow-up)
40%
53%
p=0.003log-rank
EURELOS-Data, Sorg et al., EMSOS 2014
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• local - X-ray, ultrasound, MRI, PET/CT
• lung - X-ray, CT
• bone - scintigraphy, PET/CT, WB-MRI
• others - all of the above & more
Osteosarcoma: searching for recurrencesImaging-options
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local - pain, swelling
bone - pain, swelling
others - rare, often disseminated, rarelycurative options
lung - no signs or symptoms until too late
Osteosarcoma: searching for recurrencesDon‘t forget history & physical!
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Randomized study in India
• 500 localized extremity sarcomas (359 “bone”)
• prognosis 3 years from randomization
Survival HR
Chest X-ray 67% 0,9
Chest-CT 66%
q 6 Mo 64% 1,2
q 3 Mo 69%
Lung mets: X-ray or CT?
More or less frequent?
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early => frequently
later => less often
then => quit after 5-10 years
Bone sarcoma: Searching for recurrencesCommon strategy
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Relapse-free interval & survival
Osteo Ewing
years since relapse
20181614121086420
surv
ival 1,0
,8
,6
,4
,2
0,0
34%
late n=311
(>18 months)
early n=265
(≤18 months)
p<.0001
11%
30%
7%
This happens with what is found
while we search most frequently
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Osteosarcoma, solitary lung met >10 years from initial diagnosis
This is missedif we stop looking too early
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