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Clinical Sarcoma Research
Erschienen in: Clinical Sarcoma Research 1/2012

Open Access 01.12.2012 | Short Report

The clinical use of biomarkers as prognostic factors in Ewing sarcoma

verfasst von: Annmeik M van Maldegem, Pancras CW Hogendoorn, Andrew B Hassan

Erschienen in: Clinical Sarcoma Research | Ausgabe 1/2012

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Abstract

Ewing Sarcoma is the second most common primary bone sarcoma with 900 new diagnoses per year in Europe (EU27). It has a poor survival rate in the face of metastatic disease, with no more than 10% survival of the 35% who develop recurrence. Despite the remaining majority having localised disease, approximately 30% still relapse and die despite salvage therapies. Prognostic factors may identify patients at higher risk that might require differential therapeutic interventions. Aside from phenotypic features, quantitative biomarkers based on biological measurements may help identify tumours that are more aggressive. We audited the research which has been done to identify prognostic biomarkers for Ewing sarcoma in the past 15 years. We identified 86 articles were identified using defined search criteria. A total of 11,625 patients were reported, although this number reflects reanalysis of several cohorts. For phenotypic markers, independent reports suggest that tumour size > 8 cm and the presence of metastasis appeared strong predictors of negative outcome. Good histological response (necrosis > 90%) after treatment appeared a significant predictor for a positive outcome. However, data proposing biological biomarkers for practical clinical use remain un-validated with only one secondary report published. Our recommendation is that we can stratify patients according to their stage and using the phenotypic features of metastases, tumour size and histological response. For biological biomarkers, we suggest a number of validating studies including markers for 9p21 locus, heat shock proteins, telomerase related markers, interleukins, tumour necrosis factors, VEGF pathway, lymphocyte count, and a number of other markers including Ki-67.
Begleitmaterial
Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​2045-3329-2-7) contains supplementary material, which is available to authorized users.

Competing interests

All authors have no competing financial interests in the publication of this manuscript.
No organisation is funding or implicated in the manuscripts analysis and interpretation.
Academic interests of the authors are to improve the outcome of patients with sarcoma, and this publication forms part of the deliverable output from EU funding from EuroBoNeT.

Authors' contributions

ABH conceived the study, AVM collected data with ABH, AVM and ABH wrote the paper and PCH made detailed comments. All authors have read and approved the final version of the manuscript.
Abkürzungen
LDH
Lactate dehydrogenase
REMARK
Reporting recommendations for tumour MARKer prognostic studies
ESFT
Sarcoma Family of Tumours
PNET
Primitive Neuroectodermal.

Introduction

Ewing sarcoma is the second most common primary bone sarcoma. It is an orphan state disease with approximately 900 new diagnoses a year in Europe [1]. It is also called the Ewing Sarcoma Family of Tumours (ESFT) and includes Ewing sarcoma of bone, extra-osseous Ewing sarcoma, Primitive Neuroectodermal (PNET) and Askin's tumours. Ewing sarcoma is diagnostically defined by a Ewing sarcoma EWS (chromosome 22) translocation resulting in fusion with an ETS transcription factor, the commonest abnormality (85%) being EWS-FLI1 (chromosome 11). Ewing sarcoma is a disease affecting children and young adults with a peak incidence at age fifteen. With current treatment options the 5 year survival for non-metastatic disease is 60-70%. However, survival for the 25% of patients that present with metastatic disease is approximately 20% [2], and for those who develop relapsed and/or refractory disease, the survival is no more than 10%.
Current patients are subdivided by disease stage, namely non-metastatic, metastatic and recurrence, and patients in each group are treated the same. But apparently this subdivision is not always related to clinical outcome, because of the patients who present with non-metastatic disease, approximately 30% die within 5 years. This group may be currently undertreated while the 70% who survive may be over-treated. It may therefore be important to separate the high risk patients from the low risk patients and to be able to detect chemotherapy resistance and metastases early.
A way of predicting patients' outcome is by using prognostic factors. The most commonly used are clinical features, eg age, gender, metastases. Biomarker is a synonym for biological markers and is defined as "a characteristic that is objectively measured and evaluated as an indicator of normal biological processes, pathogenic processor or pharmacologic responses to a therapeutic intervention" [3]. Biomarkers are currently already being used for screening, diagnosis, prognosis and monitoring of cancer patients. In 2005 the Reporting recommendations for tumour MARKer prognostic studies (REMARK) guidelines were published [4]. The goal of these guidelines is to make the results from clinical prognostic studies transparent and to improve the level of comparison that is possible between studies.
We report an overview of the research which has been done to identify reliable biomarkers for Ewing sarcoma in the past 15 years, where we detail the kind of markers that have been tested, the number of patients involved and the p-value showing the significance of the marker. The results highlight some interesting biomarkers, but they have yet to be validated.

Materials and methods

Search strategy

We report data available in the public domain only. Papers were identified from PubMed searches and from references in the found articles. The search algorithm was: (Ewing sarcoma) AND (prognostic factors) OR (biomarker). Only papers published between 1995 and 2010 are included. The latest search was done in June 2010. Whenever multiple reports from the same study were published, we used only the report with the latest published date to avoid any duplication of information. Papers were eligible if they: (1) described (or cited a paper that described) a Ewing sarcoma study of prognostic factors or biomarkers; (2) were published in English; and (3) came from industrialized countries. All types of evaluation were accepted (full papers, conference abstracts, reports) as long as results (including data) were presented.

Data extraction

Data extraction was conducted independently by the first author (A.M. v. M.). We used a systematic method for the search normally used for meta-analysis [5]. Differences in data extraction were resolved by consensus with a second author (A.B.H). From each eligible trial we recorded authors' names, journal and year of publication and the results from the study.

Results and Discussion

Eligible trials

A flow-chart indicating the identification of reports for inclusion in the analysis is reported for Ewing sarcoma (Figure 1). During the search many reports had to be excluded mainly because no prognostic markers were reported in the article. When we searched the reports using full text, we had to exclude some papers because no Ewing sarcoma patients were included in these reports. We identified 86 articles which were eligible for our search criteria. In these papers a total of 11, 625 patients were reported.
In this report we looked at the published data on the use of biomarkers for the last 15 years. Biomarkers were grouped into phenotypic markers and biological markers. Markers were taken as statistically significant if p < 0.05. For phenotypic markers we reported the outcome for gender, tumour size, presence of metastases and histological response after treatment (Tables 1, 2, 3 & 4). We showed the p-value reported in the eligible articles and the distribution of p correlated to the number of patients (Figures 2). There doesn't seem to be a relationship between the number of patients and the p-value. For example, the distribution of histological response shows that the studies with small patient numbers have the same statistical significance as these with large patient numbers. Throughout this report, the assumption is that the biomarker has a linear relationship to outcome. We know that for many biomarkers, this is not the case. For example, data transformation using either bicubic splines or fractional polynomials is often required to correlate continuous relationships between biomarkers and outcome, as opposed to predefined cutpoints [6]. We can only have limited extrapolation of the reported data to outcome as in most instances these questions have not been addressed.
Table 1
Outcome for phenotypic marker: gender
Author
Year
Pt number
P
Craft et al, Eur J Cancer 33 (7), 1061-9[8]
1997
142
0.3
Aparicio et al, Oncology 55, 20-6 [9]
1998
116
NS
Ahrens et al, Med Pediatr Oncol 32, 186-95 [10]
1999
177
0.92
Ginsberg et al, J Clin Oncol 17, 1809-14[11]
1999
85
0.79
Givens et al, Int J Oncol 14 (6), 1039-43[12]
1999
85
NS
Bacci et al, J Clin Oncol 18, 4-11[13]
2000
359
0.02
Jenkin et al, Med Pediatr Oncol 37, 383-9[14]
2001
93
0.73
Krasin et al, Cancer 104, 367-73[15]
2005
33
0.25
Bacci et al, Acta Oncol 45, 469-75[16]
2006
579
0.03
De Angulo et al, J Pediatr Hematol Oncol 29 (1), 48-52[17]
2007
24
NS
Leavey et al, Pediatr Blood Cancer 51 (3), 334-8[18]
2008
262
0.05
Jawad et al, Cancer 115, 3526-36[19]
2009
1631
0.004
Kikuta et al, Clin Cancer Res 15 (8), 2885-94[20]
2009
8
0.53
Sari et al, Pediatr Blood Cancer 54, 19-24[21]
2010
87
0.04
Xie et al, Chin J Cancer 29 (4), 420-4
2010
18
0.36
NS: not significant
Table 2
Outcome for phenotypic marker: tumour size
Author
Year
Pt number
P
Aparicio et al, Oncology 55, 20-6[9]
1998
116
0.0016
Kawai et al, Cancer 82, 851-9[22]
1998
20
0.0038
Ahmad et al, Cancer 85, 725-31[23]
1999
24
0.277
Givens et al Int J Oncol 14 (6), 1039-43[12]
1999
85
NS
Cotterill et al, J Clin Oncol 18, 3108-14[24]
2000
975
0.001
De Alava et al, Cancer 89, 783-92[25]
2000
55
0.02
Jenkin et al, Med Pediatr Oncol 37, 383-9[14]
2001
93
0.0001
Oberlin et al, B J Cancer 85 (11), 1646-54[26]
2001
141
0.002
Rutkowski et al, J Surg Oncol 84, 151-9[27]
2003
13
0.05
Krasin et al, Pediatr Blood Cancer 43, 229-36[28]
2004
37
S
Matsunobu et al, Clin Cancer Res 10, 1003-12[29]
2004
21
0.05
Krasin et al, Cancer 104, 367-73[28]
2005
33
0.25
Aksnes et al, Acta Oncol 45, 38-46[30]
2006
56
0.001
Bacci et al, Acta Oncol 45, 469-75[16]
2006
579
0.0004
Mikulic et al, J Pediatr Surg 41, 524-9[31]
2006
27
0.031
Cheung et al, Clin Cancer Res 13 (23), 6978-83[32]
2007
28
NS
Rodriguez-Galindo et al, Ann Oncol 19, 814-20[33]
2008
220
0.018
Yonemori et al, J Cancer Res Clin Oncol 134, 389-95[34]
2008
79
S
Jawad et al, Cancer 115, 3526-36[19]
2009
1631
0.001
Kikuta et al, Clin Cancer Res 15 (8), 2885-94[20]
2009
8
0.018
Lee et al, Cancer 116, 1964-73[35]
2010
725
0.001
Xie et al, Chin J Cancer 29 (4), 420-4
2010
18
0.44
NS: not significant, S: significant
Table 3
Outcome for phenotypic marker: metastases
Author
Year
Pt number
P
Terrier et al, Eur J Cancer 31 (3), 307-14[36]
1995
315
0.003
Terrier et al, Semin Diagn Pathol 13 (3), 250-7[37]
1996
315
S
Aparicio et al, Oncology 55, 20-6[9]
1998
116
0.03
De Alava et al, J Clin Oncol 16 (4), 1248-55[38]
1998
99
0.008
Paulussen et al, J Clin oncol 16 99), 3044-52[39]
1998
114
S
Ahmad et al, Cancer 85, 725-31[23]
1999
24
0.219
Baldini et al, Ann Surg 230 (1), 79-86[40]
1999
37
0.002
Ginsberg et al, J Clin Oncol 17, 1809-14[11]
1999
85
0.33
Luksch et al, Tumori 85 (2), 101-7[41]
1999
73
S
Cotterill et al, J Clin Oncol 18, 3108-14[24]
2000
975
0.0001
De Alava et al, Cancer 89, 783-92[25]
2000
55
0.02
Wei et al, Cancer 89, 793-9[42]
2000
39
0.001
Jenkin et al, Med Pediatr Oncol 37, 383-9[14]
2001
93
0.04
Zielenska et al, Cancer 91, 2156-64[43]
2001
26
0.0137
Martin et al, Arch Surg 138, 281-5[44]
2003
59
0.02
Fuchs et al, Clin Cancer Res 10, 1344-53[45]
2004
31
0.022
Matsunobu et al, Clin Cancer Res 10, 1003-12[29]
2004
21
NS
Weston et al, B J Cancer 91, 225-32[46]
2004
385
0.001
Aksnes et al, Acta Oncol 45, 38-46[30]
2006
56
0.001
Kreuter, Eur J Cancer 45, 1904-11[47]
2006
40
S
La et al, Int J Radiat Oncol Biol Phys 64 (2), 544-50[48]
2006
60
0.036
Cheung et al, Clin Cancer Res 13 (23), 6978-83[32]
2007
28
0.04
Leavey et al, Pediatr blood Cancer 51 (3), 334-8[18]
2008
262
0.02
Yonemori et al, J Cancer Res Clin Oncol 134, 389-95[34]
2008
79
0.02
Jawad et al, Cancer 115, 3526-36[19]
2009
385
0.001
Sari et al, Pediatr Blood Cancer 54, 19-24[21]
2010
87
0.001
Xie et al, Chin J Cancer 29 (4), 420-4
2010
18
0.01
NS: not significant, S: significant
Table 4
Outcome for phenotypic marker: histological response
Author
Year
Pt number
P
Delepine et al, J Chemother 9 (5), 352-63[49]
1997
39
0.05
Picci et al, J Clin Oncol 15 (4), 1553-9[50]
1997
118
0.0001
Aparicio et al, Oncology 55, 20-6[9]
1998
116
0.018
Paulussen et al, J Clin Oncol 16 (9), 3044-52[39]
1998
114
S
Abudu et al, J Bone Joint Surg 81 (2), 317-22[51]
1999
50
0.03
Ahrens et al, Med Pediatr Oncol 32, 186-95[10]
1999
177
0.27
Baldini et al, Ann Surg 230 (1), 79-86[40]
1999
37
0.01
Bacci et al, J Clin Oncol 18, 4-11[13]
2000
359
0.001
De Alava et al, Cancer 89, 783-92[25]
2000
55
0.001
Ohali et al, J Clin Oncol 21, 3836-43[52]
2003
31
0.0001
Scotlandi et al, Eur J Cancer 41, 1349-61[53]
2005
113
0.05
Bacci et al, Acta Oncol 45, 469-75[16]
2006
579
0.0005
Mikulic et al, J Pediatr Surg 41, 524-9[31]
2006
27
0.047
Avigad et al, Clin Cancer Res 13 (19), 5777-83[54]
2007
32
0.13
Yonemori, J Cancer Res Clin Oncol 134, 389-95v [34]
2008
79
0.04
Meynet et al, Cancer Res 70 (9), 3730-8[55]
2010
97
0.02
S: significant

Primary outcome

The investigated biomarkers are subdivided in two groups, phenotypic markers and biological markers. For the phenotypic markers gender, tumour size, metastases and histological response are reported in Tables 1, 2, 3 and 4. For all these phenotypic markers we compared the patient number and p-value, in which p < 0.05 was taken as statistically significant. However we weren't able to retrieve the p-value in all articles, sometimes it was only mentioned as being significant or non-significant. For each phenotypic marker we looked at the differences in overall survival between: for gender, men vs women; for tumour size, < 8-10 cm vs > 8- 10 cm; for metastasis presence at initial presentation vs absence and for histological response, > 90% necrosis vs < 90% necrosis. Distributions of p related to patient numbers in these four phenotypic markers are shown in Figures 2. For these four phenotypic markers we show that there is no correlation between the number of patients and the statistical significance of the outcome. More phenotypic markers were reported: fusion type, ethnicity, performance status and margins. However because of the low number of studies which reported these outcomes these results are not shown in detail. In 26 articles the impact of tumour site on the overall survival is shown, but because sites are compared in different ways it is difficult to summarize these findings.
Currently clinical stage is being used to determine whether a patient has a high or low risk for developing metastases or recurrence. However, it seems that clinical stage is not always related to outcome, because of the patients who present with non-metastatic disease, only 70% of them survive for 5-years. Therefore, what is the difference between the 70% of the patients who survive and the 30% who don't? Can one somehow foretell chemotherapy resistance and detect metastases early? One way to predict the outcome of patients apart from clinical stage is to use biomarkers. These are objective measurements which reflect biological processes. The biomarkers currently being used are tumour size and the presence of metastases. Biological markers are not being used, even though they may provide a way to predict a patient's outcome more accurately than phenotypic markers. From the results for phenotypic markers we can see that gender is probably not significant important for patient outcome. In 15 articles we found 11 reports that gender is non-significant. Tumour size > 8 cm seems to be important, with 15 out of 22 articles finding it to be a predictor and significantly related to negative outcome. The presence of metastasis is a strong predictor of negative outcome with 24 articles reporting it as significantly relevant compared to only 3 reporting it as non-significant. For histological response, 12 out of 16 articles found that necrosis > 90% after treatment is a significant predictor for positive outcome.
For some phenotypic markers it is unclear how the cut-off point between predictor of positive or negative outcomes is determined. For tumour size the cut-off point for negative outcome is > 8 cm, but it is undefined how this is selected. It seems more logical that tumour size is a continuous variable with an increasingly negative outcome with increasing size. The same can probably be said for age and surgical margins.
Biological markers are more difficult to compare, because for most of these markers only one or two reports are published. We grouped the biological markers according to their function and we ended up with 5 groups, namely cell cycle, karyotype, immunological, blood products and the remaining biological markers which couldn't be classified in one of the other groups. The results from the biological markers are shown in Tables 5, 6, 7, 8 and 9. The correlation between patient number and statistical significance of the outcome for the five groups is shown in Figures 3. We show that there is no correlation between the patient number and the statistical significance of the outcome. It appears that ki67, an S-phase cell cycle biomarker, may be a biomarker of cell activity in the tumour that significantly correlates with outcome. The mechanism for the activation of cell cycle appears unclear, but is presumably driven by other factors other that EWS-FLI1 translocation. Loss of function of cell cycle dependent kinases (p16, p14, p21) and other regulators of the cell cycle through the p53 pathway (MDM2, p53), also appear deregulate in a proportion of tumours and potentially are useful prognostic markers. Importantly, activity of telomerase appears significantly correlated with outcome as occurs in many other tumours. There appears much interest in secondary copy number changes and mutations in Ewing sarcoma, and in particular, chromosome 1 (Table 6). For example, recent evidence points to gain of 1q and alteration in abundance of a gene product called CDt2 involved in ubiquitination [7]. It is however difficult to objectively say anything about the other reported markers because they may influence each other. This appears most clear for tumour size and metastases, where bigger tumours may correlate with a higher chance of having metastases. For biological markers it is probably the same issue, but less clear because we don't really know their true experimental influence on tumour genesis. For example, LDH levels are probably a reflection of cell turnover in larger tumours, and may be an indirect measure of bulk of disease (comparing Table 2 versus Table 9). It is also more difficult to say anything about biological markers because they haven't been tested as extensively as phenotypic markers, and certainly they have not often been validated independently. Results for most of these markers are only reported in 1 or 2 articles with sometimes small numbers of patients and no statistical validation. To improve this situation it would important to capture high quality clinical material and clinical outcome to develop a bio-bank. We may be able to test the most promising biomarkers from previously run studies and so define their significance. Either a multivariate analysis or data mining analysis should be done to evaluate the way biomarkers affect each other. The easiest way to achieve this objective is by collecting material and outcome data from large phase III trials. It is also important to standardize the way material is collected and how the biomarkers are compared. For example, the phenotypic marker tumour site is the most often tested marker with results published in 26 articles (data not shown). However it is not possible to say anything about these results since different tumour sites are compared in the reports. This is also true for the marker age in which different age groups are compared with each other, for example some articles compare patients < 18 years vs > 18 years, others < 30 years vs > 30 years (data not shown).
Table 5
Outcome for biological markers: cell cycle
Author
Year
Biomarker
Pt number
P
Landanyi et al, J Pathol 175 (2), 211-7
1995
MDM-2
30
0.005
Luksch et al, Tumori 85 (2), 101-7[41]
1999
Mitose presence
73
S
Sollazzo et al, tumori 85 (3), 167-73[56]
1999
Ki-67
38
0.01
De Alava et al, Cancer 89, 783-92[25]
2000
Ki-67
55
0.005
Abudu et al, Br J Cancer 79(7-8), 1185-9[57]
1999
P53
50
0.02
Huang et al, J Clin Oncol 23, 548-58[58]
2005
P53
60
0.001
Matsunobu et al, C;in Cancer Res 10, 1003-12[29]
2004
P27
21
0.01
Wei et al, Cancer 89, 793-9[42]
2000
INK4a
39
0.001
Maitra et al, Arch Pathol Lab Med 125, 1207-12[59]
2001
P16INK4a
20
0.41
Maitra et al, Arch Pathol Lab Med 125, 1207-12[59]
2001
P14ARF
20
NS
Huang et al, J Clin Oncol 23, 548-58[58]
2005
P16/p14ARF
60
0.03
Maitra et al, Arch Pathol Lab Med 125, 1207-12[59]
2001
P21WAF1
20
0.61
Ohali et al, Oncogene 23, 8997-9006[60]
2004
Cadherin-11
20
0.024
Cheung et al, Clin Cancer Res 13 (23), 6978-83[32]
2007
STEAP1
28
0.0012
Cheung et al, Clin Cancer Res 13 (23), 6978-83[32]
2007
CCND1
28
0.0077
Martins et al, Cancer Res 68 (15), 6260-70[61]
2008
Heat shock 90
54
S
Zanini et al, Virchows Arch 452, 157-67[62]
2008
Heat shock 27
unknown
NS
S: significant, NS: not significant
Table 6
Outcome for biological markers: karyotype
Author
Year
Biomarker
Pt number
P
Tarkannen et al, Cancer Genet Cytogenet 114, 35-41
1999
1q
28
NS
Hattinger et al, Br J Cancer 86, 1763-9[63]
2002
1q
134
0.046
Tarkannen et al, Cancer Genet Cytogenet 114, 35-41
1999
6p2.1
28
0.004
Lopez-Guerrero et al, Lab Invest 81 (6), 803-14[64]
2001
9p21 locus
19
0.005
Hattinger et al, Br J Cancer 86, 1763-9[63]
2002
16q
134
0.008
Hattinger et al, Genes Chromosomes Cancer 24 (3), 243-54[65]
1999
Chr 1
58
0.004
Tarkannen et al, Cancer Genet Cytogenet 114, 35-41
1999
Chr 8
28
NS
Hattinger et al, Genes Chromosomes Cancer 24 (3), 243-54[65]
1999
Chr 8
58
0.17
Hattinger et al, Br J Cancer 86, 1763-9[63]
2002
Chr 8
134
NS
Tarkannen et al, Cancer Genet Cytogenet 114, 35-41
1999
Chr 12
28
NS
Hattinger et al, Genes Chromosomes Cancer 24 (3), 243-54 [65]
1999
Chr 12
58
0.63
Hattinger et al, Br J Cancer 86, 1763-9[63]
2002
Chr 12
134
0.009
Ohali et al, J Clin Oncol 21, 3836-43[52]
2003
Telomerase activity
31
0.0001
Avigad et al, Clin Cancer Res 13 (19), 5777-83[54]
2007
Telomerase length
32
0.015
NS: not significant, Chr: Chromosome
Table 7
Outcome for biological markers: immunological
Author
Year
Biomarker
Pt number
P
Rutkowski et al, J Surg Oncol 84, 151-9[27]
2003
IL-1ra
13
0.0001
Rutkowski et al, J Surg Oncol 84, 151-9[27]
2003
sIL-2ra
13
0.005
Rutkowski et al, J Surg Oncol 84, 151-9[27]
2003
IL-6
13
0.001
Rutkowski et al, J Surg Oncol 84, 151-9[27]
2003
IL-8
13
0.0001
Rutkowski et al, J Surg Oncol 84, 151-9[27]
2003
IL-10
13
0.01
Rutkowski et al, J Surg Oncol 84, 151-9[27]
2003
TNF RI
13
0.001
Rutkowski et al, J Surg Oncol 84, 151-9[27]
2003
TNF RII
13
0.01
Rutkowski et al, J Surg Oncol 84, 151-9[27]
2003
M-CSF
13
0.01
Berghuis et al, J Pathol 218, 222-31[66]
2009
HLA class I
67
NS
NS: not significant
Table 8
Outcome for biological markers: blood products
Author
Year
Biomarker
Pt number
P
Holzer et al, Med Pediatr Oncol 36 (6), 601-4[67]
2001
VEGF
6
NS
Pavlakovic et al, Int J Cancer 92, 756-60 [68]
2001
VEGF
4
0.017
Rutkowski et al, J Surg Oncol 84, 151-9[27]
2003
VEGF
13
NS
Fuchs et al, Clin Cancer Res 10, 1344-53[45]
2004
VEGF
31
0.0047
Jimeno et al, Pediatr Blood Cancer 49, 352-7[69]
2007
VEGF
16
NS
Kreuter et al, Eur J Cancer 42, 1904-11[47]
2006
VEGF-A
40
0.013
Kreuter et al, Eur J Cancer 42, 1904-11[47]
2006
VEGFR-1
40
0.946
Kreuter et al, Eur J Cancer 42, 1904-11[47]
2006
VEGFR-2
40
0.946
Aparicio et al, Oncology 55, 20-6[9]
1998
Lymphocyte count
116
0.0044
De Angulo et al, J Pediatr Hematol Oncol 29 (1), 48-52[17]
2007
Lymphocyte count
24
0.001
De Angulo et al, J Pediatr Hematol Oncol 29 (1), 48-52 [17]
2007
Platelet count
24
NS
De Angulo et al, J Pediatr Hematol Oncol 29 (1), 48-52[17]
2007
Neutrophil count
24
NS
Aparicio et al, Oncology 55, 20-6[9]
1998
Erythrocyte sedimentation rate
116
0.02
Oberlin et al, B J Cancer 85 (11), 1646-54[26]
2001
Erythrocyte sedimentation rate
141
0.04
Yabe et al, Oncol Rep 19 (1), 129-34[70]
2008
Erythrocyte sedimentation rate
20
NS
NS: not significant
Table 9
Outcome for biological markers: remaining
Author
Year
Biomarker
Pt number
P
Craft et al, Eur J Cancer 33 (7), 1061-9[8]
1997
LDH
142
NS
Aparicio et al, Oncology 55, 20-6[9]
1998
LDH
116
0.001
Givens et al, Int J Oncol 14 (6), 1039-43[12]
1999
LDH
85
NS
Bacci et al, Oncol Rep 6 (4), 807-11[71]
1999
LDH
618
S
Luksch et al, Tumori 85 (2), 101-7[41]
1999
LDH
73
S
Bacci et al, J Clin Oncol 18, 4-11[13]
2000
LDH
359
0.0003
Matsunobu et al, Clin Cancer Res 10, 1003-12[29]
2004
LDH
21
NS
Bacci et al, Acta Oncol 45, 469-75[16]
2006
LDH
579
0.0005
Cheung et al, Clin Cancer Res 13 (23), 6978-83[32]
2007
LDH
28
0.99
Yabe et al, Oncol Rep 19 (1), 129-34[70]
2008
LDH
20
NS
Leavey et al, Pediatr Blood Cancer 51 (3), 334-8[18]
2008
LDH
262
0.0016
Xie et al, Chin J Cancer 29 (4), 420-4
2010
LDH
18
NS
Terrier et al, Eur J Cancer 31 (3), 307-14[36]
1995
Filigree pattern
315
0.044
Terrier et al, Eur J Cancer 31 (3), 307-14[36]
1995
Dark cells
315
0.043
Aparicio et al, Oncology 55, 20-6[9]
1998
Albumine levels
116
0.0006
Sollazzo et al, Tumori 85 (3), 167-73[56]
1999
c-myc
38
S
Ohali et al, Oncogene 23, 8997-9006[60]
2004
MTA1
20
0.003
Cheung et al, Clin Cancer Res 13 (23), 6978-83[32]
2007
NKX2-2
28
0.0017
Kikuta et al, Clin Cancer Res 15 (8), 2885-94[20]
2009
Nucleophosmin positivity
8
0.01
Meynet et al, Cancer Res 70 (9), 3730-8[55]
2010
Xg expression
97
0.047
S: significant, NS: not significant
For markers of tumour growth, angiogenesis if often quantified, but so far biomarker analysis has been predominantly limited to measurement of VEGF pathway (Table 8). The immunological biological markers interleukins and tumour necrosis factors seem very promising (Table 7). However these have all been tested in one institute, with very small patient numbers and the data doesn't seem to be validated. Most of the biological markers mentioned in the blood products group (Table 8) are probably surrogates for tumour size and they should be validated in either a multivariate analysis or machine learning to see if they can be used as an objective biological marker.
At the present time it is no possible to make a definite list of biological biomarkers able to predict patient outcome, mainly because these markers also have to be stratified with respect to the major staging phenotypic features, e.g. presence of metastasis and degree of histological response. It is also unclear what quality control measure were used in the limited patient cohorts. Our recommendation would be continue divide patients according to their disease stage and also to use the phenotypic biomarkers metastasis, tumour size and histological response. For biological biomarkers we would like to validate previous work done on the markers for 9p21 locus and the involved genes and proteins, heat shock proteins, telomerase related markers, interleukins, tumour necrosis factors, VEGF pathway, lymphocyte count, MTA1, STEAP1, CCND1, MDM-2, Ki-67, p53, p27 and cadherin-11. At this time, neither phenotypic (clinical) or biological biomarkers are utilised in stratification of patients in clinical trials.

Acknowledgements

We thank EuroBoNeT FP6 ROK for funding and the Oxford Biomedical Research Centre for support.
Open Access This article is published under license to BioMed Central Ltd. This is an Open Access article is distributed under the terms of the Creative Commons Attribution License ( https://​creativecommons.​org/​licenses/​by/​2.​0 ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Competing interests

All authors have no competing financial interests in the publication of this manuscript.
No organisation is funding or implicated in the manuscripts analysis and interpretation.
Academic interests of the authors are to improve the outcome of patients with sarcoma, and this publication forms part of the deliverable output from EU funding from EuroBoNeT.

Authors' contributions

ABH conceived the study, AVM collected data with ABH, AVM and ABH wrote the paper and PCH made detailed comments. All authors have read and approved the final version of the manuscript.
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Metadaten
Titel
The clinical use of biomarkers as prognostic factors in Ewing sarcoma
verfasst von
Annmeik M van Maldegem
Pancras CW Hogendoorn
Andrew B Hassan
Publikationsdatum
01.12.2012
Verlag
BioMed Central
Erschienen in
Clinical Sarcoma Research / Ausgabe 1/2012
Elektronische ISSN: 2045-3329
DOI
https://doi.org/10.1186/2045-3329-2-7

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