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Erschienen in: Diagnostic Pathology 1/2019

Open Access 01.12.2019 | Research

Low ERCC1 expression is a good predictive marker in lung adenocarcinoma patients receiving chemotherapy based on platinum in all TNM stages - a single-center study

verfasst von: Marina Piljić Burazer, Suzana Mladinov, Antonela Matana, Sendi Kuret, Joško Bezić, Merica Glavina Durdov

Erschienen in: Diagnostic Pathology | Ausgabe 1/2019

Abstract

Background

High ERCC1 expression is thought to be related with resistance to chemotherapy based on platinum. The aim of this study was to present our institutional observations regarding to the association of ERCC1 and overall survival (OS) of the lung adenocarcinoma patients who received chemotherapy based on platinum.

Material/methods

A total of 253 lung adenocarcinoma patients in all TNM stages were retrospectively investigated. The diagnosis was based on small biopsy samples obtained during bronchoscopy. Depending on the TNM stage of the disease and clinical condition, patients received only the chemotherapy based on platinum, or in combination with radiotherapy or surgery. Tissue sample for ERCC1 immunohistochemical analysis was sufficient in 129 patients. Low from high ERCC1 expression was separated by the semi-quantitative H-score median.

Results

High ERCC1 expression was found in 47.3% patients, and was correlated with higher TNM (p = 0.021), tumor enlargement (p = 0.002), positive lymph nodes (p = 0.001), positive distant metastasis (p = 0.005), and higher relative risk of death (p < 0.001). Furthermore, significance association was observed for low ERCC1 expression and better performance status (ECOG) (p = 0.023). Longer OS was strongly associated with a low ERCC1 expression, not only in the group of patients in TNM stage I-III, who were treated with combination of chemotherapy with surgery or radiotherapy (p = 0.002), but also in the group of patients in TNM stage IV who received only chemotherapy based on platinum (p < 0.001), compared with the patients in the same TNM stage and high ERCC1 expression.

Conclusions

ERCC1 expression in lung adenocarcinoma is a useful prognostic marker and moreover, a useful predictive marker in patients receiving chemotherapy based on platinum in all stages of the disease.
Hinweise

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Abkürzungen
ALK
Anaplastic lymphoma kinase
C
Chemotherapy
ECOG PS
Eastern Cooperative; Oncology Group Performance Status
EGFR
Epidermal growth factor receptor
ERCC1
Excision repair cross-complementing group 1
HR
Hazard ratio
HRP
High resolving power
IHC
Immunohistochemistry
mRNA
Messenger ribonucleic acid
NSCLC
Non-small cell lung carcinoma
OS
Overal survivall
R
Radiotherapy
ROS
C-ros oncogene 1
S
Surgery
SPSS
Statistical Package for the Social Sciences
TNM
Tumor Nodes Methastasis

Background

Adenocarcinoma is commonest non-small cell lung carcinoma (NSCLC), generally diagnosed in the advanced stage of the disease when it is not operable [1]. If we exclude adenocarcinomas with PD-L1 expression ≥50%, and those with ALK, EGFR and ROS mutations, the basic current care of advanced disease is chemotherapy based on platinum [2]. Drugs based on platinum form platinum-DNA adducts that obstruct cell replication and cause apoptosis. DNA damage could be repaired trough many biological processes and cause resistance to the platinum [3]. On the contrary to the immune and the molecular targeted therapies, no specific predictive marker is so fare available for platinum-based chemotherapy in lung adenocarcinoma. The best validated marker is the endonuclease excision repair cross-complementation group 1 (ERCC1), one of thirty enzymes of the nucleotide excision repair pathway. ERCC1 is the major enzyme that repairs DNA damage caused by the action of platinum, and is one of the possible factors that reduces the platinum effect [4]. The results of many studies on the significance of ERCC1 in lung adenocarcinoma are inconsistent. Previous retrospective studies and meta-analyses have correlated high ERCC1 expression with poor prognosis and platinum resistance [3, 5, 6], in a contrast to study of Booton et al. who did not find any correlation between the ERCC1 status and survival [7]. Sad et al. reported that longer survival was associated with low ERCC1 expression in lung adenocarcinoma patients who received chemotherapy based on platinum compared with those with high ERCC1 expression [8]. The same observation was presented in the study of Zhao et al. who found out that in advanced NSCLC, low ERCC1 expression indicates better prognosis and improved effectiveness for platinum-based chemotherapy [9]. In a contrary, Lee et al. concluded in a prospective ERCC1 trial (ET) that selecting chemotherapy by using a commercially available ERCC1 antibody did not prolong survival [10].
Therefore, the aim of the study was to present our single-institution experience on the importance of ERCC1 analysis in lung adenocarcinoma patients.

Material and methods

Patients characteristics

During three-year period (2013–2015), on small biopsies obtained during bronchoscopy, 253 new patients (161 males) with primary lung adenocarcinoma, median age 65 years (minimum-maximum: 44–91) were diagnosed at the Institute of Pathology, Forensic Medicine and Cytology, Clinical Hospital Center Split, Croatia. Clinical data of the patients were available at the Pulmonology Department. Clinical staging of the lung adenocarcinoma according to the 8th TNM staging system was determined by imaging radiologic techniques [11]. Patients received only chemotherapy based on platinum, or combined with surgery or radiotherapy depending on the TNM stage and clinical condition. Symptomatically treated patients and those treated only by surgery were not included in the study. All patients in our study had ALK and EGFR analysis of tumor tissue (ALK expression by IHC and EGFR mutation by PCR). These patients were also treated with platinum-based therapy, because in time when we conducted the study, tyrosine kinase inhibitor (TKI) therapy was not yet approved in Croatia. ROS analysis was not performed because it was introduced in routine practice in the March 2019. Survival was followed-up during period of 53 months, starting from the time of diagnosis till the time of death or May 2017. From the Registry of Mortality death data were obtained. This study was approved by Ethics Committee of the Hospital (500–03/15/01/42).

Immunohistochemistry

From the archive of the Institute of Pathology, Forensic Medicine and Cytology the paraffin blocks of tumor tissue were obtained, and sectioned at 5 μm thickness. The expression of ERCC1 in the nucleus of tumor cells was performed using mouse monoclonal primary antibody, ready to use (4F9) (DACO, Glostrup, Denmark), stained on automatic stainer GX BenchMark (Ventana, Tuscon, Arizona) and visualised with Ventana DAB Detection kit iVieW (Ventana, Tuscon, Arizona). Tissue sample for ERCC1 immunohistochemical analysis was sufficient in 129 (50.7%) patients and interpretation of ERCC1 expression was performed according to Olaussen et al. [12]. Briefly, intensity of positive nuclear reaction (from 0 to 3) was multiplied by the percentage of positive cells (0 if =0%, 0.1 if 1–9%, 0.5 if 10–49%, and 1.0 if ≥50%) to obtain a semi-quantitative H score. The median of H scores was chosen for separating low from high levels of ERCC1 expression. Positive internal control was respiratory epithelium i.e. staining intensity 2. Olympus microscope BX 51 (Olympus, Tokyo, Japan) was used for analysis of ERCC1 expression at magnification of 400x by three independent pathologists who were blinded to all patients’ characteristics and survival status.

Statistical analysis

The SPSS software 19 for Windows (Chicago, Illinois, USA) was used for statistical analysis and p < 0.05 was considered statistically significant for all tests. The differences between the categorical characteristics were calculated by the χ2 test. The numerical characteristics were analysed by the Kruskal-Wallis test and the Mann-Whitney test. Factors associated with overall survival were evaluated by logistic regression and Cox univariate and multivariate analyses. Kaplan-Meier method was used to calculate survival curves, and log-rank test to evaluate differences between them.

Results

Patients characteristics and ERCC1 status

Among 253 patients, 161 (63.6%) were males, 96 (86.5%) were smokers, 163 (69%) with TNM stage IV disease and a median age of 65 years (minimum-maximum: 44–91 years). A total of 6% patients had positive ALK expression and 10% had EGFR mutation. The significant correlation between ALK expression or EGFR mutations with observed variables were not found. The median value of all high scores for ERCC1 expression of 0.1 (0–3) was used to separate tumors with low ERCC1 expression (i.e. ≤ 0.1) from high ERCC1 expression (i.e. > 0.1). The majority of patients, 142 (77.2%) were treated with platinum-based chemotherapy alone, and in 26 (14.1%) patients, chemotherapy was combined with surgical resection and in 16 (8.7%) with radiotherapy (Table 1).
Table 1
Patients characteristics (N = 253)
Characteristics
 
N (%)
Age (years)
≤65
125 (49.4%)
Sex
Male
161 (63.6%)
Smoking status
Yes
96 (86.5%)
ECOG PSa
0
75 (52.9%)
1
31 (21.8%)
2
17 (12%)
3
8 (5.6%)
4
11 (7.7%)
TNM stage
I
9 (3.8%)
II
28 (12%)
III
34 (14.6%)
IV
163 (69.6%)
Tumor size
T 1
22 (9.2%)
T 2
71 (29.7%)
T 3
69 (28.9%)
T 4
77 (32.2%)
Lymph node
Positive
177 (75%)
Metastasis
Yes
163 (69.4%)
ERCC1
≤0.1
68 (52.7%)
>  0.1
61 (47.3%)
Therapyb
C
142 (77.2%)
C + S
26 (14.1%)
C + R
16 (8.7%)
aECOG PS Eastern Cooperative Oncology Group Performance Status
bC chemotherapy, S surgical resection, R radiotherapy
A total of 129 (50.7%) patients had a sufficient material in paraffin block for immunohistochemistry analysis for ERCC1. High ERCC1 expression was found in 61 (47.3%) patients and was strongly correlated with higher TMN (p = 0.021), tumor enlargement (p = 0.002), positive lymph nodes (p = 0.001), distant metastasis (p = 0.005). Furthermore, significant association was observed for low ERCC1 expression and better clinical condition (ECOG) for grouped ECOG stages 3 and 4 compared to others ECOG stages (p = 0.023) (Table 2).
Table 2
Patients characteristics according to the ERCC1 status (N = 129)
 
ERCC1
 
≤0.1 (N = 68)
> 0.1 (N = 61)
χ2
p
Sex
Male
44 (65%)
42 (69%)
0.249
0.378
Smoking status
Yes
28 (82%)
31 (82%)
0.007
0.589
ECOGa
0
25 (61%)
16 (36%)
9.498
0.023
1
10 (24%)
9 (21%)
2
4 (10%)
8 (18%)
3
2 (5%)
3 (7%)
4
0 (0%)
8 (18%)
Tumor size
T 1
10 (15%)
2 (3%)
15.325
0.002
T 2
25 (37%)
14 (23%)
T 3
18 (27%)
13 (22%)
T 4
14 (21%)
31 (52%)
Lymph node
Positive
47 (69%)
54 (92%)
9.742
0.001
Metastasis
Yes
48 (71%)
55 (90%)
7.657
0.005
TNM stageb
I
2 (3%)
0 (0%)
7.690
0.021
II
7 (10%)
3 (5%)
III
11 (16%)
3 (5%)
IV
48 (71%)
55 (90%)
aECOG was grouped as 0: 1: 2: (3 + 4)
bTNM stage was grouped as (I + II): III: IV

Survival analysis

During follow-up period of 53 months, 186 (73.5%) patients died. The median overall survival was 10 months (SE:0.87; 95% CI:6–14). Among deceased patients, a higher rate of high ERCC1 expression was found, compared with patients who were alive (95% vs. 52%; p < 0.001).
Univariate Cox’s regression analysis revealed factors that significantly influenced survival (Table 3). Higher relative risk for death was associated with high ERCC1 expression (p < 0.001), higher TNM and ECOG (p < 0.001; p < 0.001, respectively), tumor enlargement (p < 0.001), positive lymph nodes (p < 0.001) and distant metastasis (p < 0.001). Relative risk of death rose 2.491 times whenever ERCC1 expression rose (95%CI:2.019–3.073; p < 0.001) (Fig. 1a, b).
Table 3
Cox regression analysis for survival
  
HR
95% CI
p
Sex
Male
0.803
0.594–1.086
0.154
Age (years)
≤65
1.063
0.797–1.417
0.678
Smoking status
Yes
1.110
0.573–2.153
0.757
ECOG
0–4
1.684
1.450–1.956
< 0.001
Tumor size
T1
  
< 0.001
T2
1.336
0.649–2.750
T3
2.214
1.089–4.501
T4
4.445
2.212–8.935
Lymph node
Positive
4.132
2.660–6.418
< 0.001
Metastasis
Yes
3.498
2.391–5.118
< 0.001
TNM stagea
I + II
  
< 0.001
III
2.488
1.265–4.891
IV
5.474
3.107–9.645
ERCC1
≤ 0.1
6.478
4.035–10.401
< 0.001
> 0.1
aTNM stage was grouped as (I + II): III: IV
Multivariate Cox’s regression analysis adjusted for significant prognostic factors for survival revealed high ERCC1 expression (HR:5.126; 95%CI:2.594–10.130; p < 0.001) and higher ECOG (HR:4.425; 95%CI:1.891–10.353; p = 0.008) for grouped ECOG stages 3 and 4 compared to others ECOG stages, as an independent factors of worse prognosis.
Statistically significant differences in overall survival were found according to ECOG (p < 0.001), tumor size (p < 0.001), lymph nodes (p < 0.001), distant metastasis (p < 0.001), TNM (p = 0.01), and ERCC1 expression (p < 0.001). OS was 5 times longer in patients with low ERCC1 expression compared with those with high ERCC1 expression (25 months vs. 5 months) (Table 4).
Table 4
Overall survival of lung adenocarcinoma patients according to the analysed variables
  
Average survival (SE);95%CI
Median survival (SE);95%CI
LR
p
Age (years)
≤65
20.109 (1.762); 15.656–23.561
10.00 (0.972)
8.095–11.905
0.181
0.670
> 65
19.331 (1.711);
15.977–22.684
10.00 (3.232)
3.664–16.336
Sex
Male
18.443 (1529); 15.445–21.440
9 (1.002);
7.037–10.963
2.150
0.143
Female
22.049 (2.049);
18.044–26.055
17 (3972);
9.215–24.785
Smoking status
Yes
17.4 (1.935)
13.607–21.193
8 (1224)
5.600–10.400
0.102
0.750
No
15.116
8.760–21.471
16 (10.797)
0–37.163
ECOG
0
25.916 (2.468)
21.079–30.754
23 (3.910)
15.336–30.664
62.106
< 0.001
1
12.172 (2.073)
8.109–16.235
7 (1.113)
4.819–9.181
2
10.882 (3.096)
4.815–16.950
7 (1.543)
3.975–10.025
3
4.750 (2.169)
0.498–9.002
2 (0.685)
0.658–3.342
4
2.36 (1.073)
0.534–4.739
2 (0.591)
0.842–3.158
TNM stage*
I + II
39.355 (2.654)
34.154–44.556
39 (7.649)
24.009–53.991
50.830
< 0.001
III
25.660 (3.171)
19.444–31.876
23 (3.312)
16.08–29.492
IV
13.861 (1.355)
7 (0.762)
Tumor size
T1
32.709 (4702)
23.494–41.924
 
52.961
< 0.001
T2
28.521 (2.419)
23.779–33.262
23 (3.512)
16.116–29.884
T3
19.520 (2.272)
15.068–23.973
10 (2.371)
2.371–5.353
T4
9.240 (1.201)
6.886–11.595
5 (0,625)
3.774–6.226
Lymph node
Negative
36.468 (2.402)
31.761–41.175
45 (9468)
26.443–63.557
48.562
< 0.001
Positive
12.137–17.275
7 (0,739)
5.552–8.448
Metastasis
No
33.370 (2.201)
29.057–37.683
32 (5,4)
21.416–42.84
48.784
< 0.001
Yes
13.819 (1.348)
11.178–16.461
7 (0,734)
5.561–8.439
ERCC1
≤ 0.1
30.793 (2.543)
25.810–35.777
25 (4.594)
15.996–34.004
78.710
< 0.001
>  0.1
5.951 (0.696)
4.586–7.316
5 (0.441)
4.135–5.865
TNM IV/C**
≤ 0.1
24.719 (2.034)
20.732–28.705
24 (3.607)
16.931–31.069
65.412
< 0.001
>  0.1
5.511 (0.564)
4.404–6.617
5 (0.295)
4.421–5.572
TNM I-III/ C + S or R**
≤ 0.1
45.727 (4.025)
37.838–53.616
 
9.290
0.002
>  0.1
11.400 (4.614)
2.356–20.444
8 (4.382)
0–18.588
*TNM stage was grouped as (I + II): III: IV
**TNM IV/ C - TNM stage IV patients, receiving only chemotherapy based on platinum (C)
***TNM I-III/C + S or R - TNM stage I-III patients receiving combination of radiotherapy (R) or surgery (S) with chemotherapy (C)
The predictive value of ERCC1 was analysed by observing the correlation between OS of the lung adenocarcinoma patients in different TNM stages treated with different therapeutic modalities, and ERCC1 status (Fig. 2a, b). Among 102 patients in TNM stage IV/ treated only with chemotherapy, low ERCC1 expression was found in 45 (44.12%) patients and was correlated with longer OS compared with those who had high ERCC1 expression (24 months vs. 5 months; p < 0.001). Furthermore, 27 patients were in TNM stages I-III and received chemotherapy based on platinum combined with surgery or radiotherapy. Low ERCC1 expression was found in 8 (29.6%) of these patients and was correlated with longer OS compared to those with high ERCC1 expression (p = 0.002).

Discussion

Previous retrospective studies and meta-analyses revealed that high ERCC1 expression is a negative predictor in patients who received chemotherapy based on platinum and good prognostic marker in patients who did not [2, 3, 6, 1315]. The same observations were found in ovarian epithelial carcinoma, squamous carcinoma of the head and neck, and gastroenteric carcinomas [16, 17]. So far, conflicting results were found in few studies according to correlation of ERCC1with prediction or prognosis in NSCLC. Findings in the meta-analysis of Roth et al. supported the hypothesis that ERCC1 is associated with response to chemotherapy based on platinum and OS in advanced NSCLC, but the study of Booton et al. did not confirmed that hypothesis [7, 14]. Several prospective studies have suggested that ERCC1 is predictive in NSCLC. The study by Cobo et al. prospectively evaluated expression of ERCC1 mRNA in advanced stage of NSCLC in order to predict response to cisplatin-free or cisplatin-based therapy. Patients in control group received docetaxel/cisplatin combination. The other group of patients received docetaxel/cisplatin or docetaxel/gemcitabine regimens respectively, according to low or high ERCC1 mRNA levels and their response rates were significantly higher (50.3%) compared with the control group (39.3%) [18]. Takemoto et al. prospectively evaluated the benefit of therapy without platinum for patients in TNM stages IIIB/IV who expressed high level of ERCC1 mRNA, and concluded that therapy without platinum might be effective for those patients [19]. In a contrast to these findings, Lee et al. concluded in a prospective ERCC1 trial (ET) that in patients with advanced disease, choosing the best suitable chemotherapy by using a commercially available ERCC1 antibody, did not prolong survival [10]. Our study was retrospective, and chemotherapy based on platinum was applied to all of our patients. In a few patients, chemotherapy was combined with surgery or radiotherapy depended on the TNM stage of the disease and the clinical condition of the patient. A correlation between low ERCC1 expression and longer OS was found in patients in all TMN stages. Knowing that ERCC1 is the major enzyme involved in platinum damage repair, this result was hypothetically expected, as a consequence of the ineffectiveness of the ERCC1 enzyme to repair the damage caused by platinum [20]. Awareness of the fact that a lot of other factors, in addition to ERCC1 contribute to chemotherapy response, more analysis are required for verification of this hypothesis.
ERCC1 status could be evaluated trough the immunohistochemical (IHC) staining or by real-time polymerase chain reaction (RT-PCR) method. Carter et al. emphasized the importance of selected therapy trough molecular analysis of cancer cells using IHC, with the intention to increase patients’ benefits, and ERCC1 was evaluated as a predictor of better outcome in lung adenocarcinoma patients [21]. In our study, the expression of ERCC1 was assessed trough IHC staining and graded using the same scoring system as Olaussen. The median H score of 0.1 (0–3) was used to define low versus high ERCC1 expression [5], and it was lower than in Olaussens study (0.1 vs 1), but when we correlated our results to patients’ outcome, the results between these two studies were in agreement. Although, IHC is useful method for evaluation the protein expression in tumor tissue, we have to be careful with the interpretation of IHC staining. There are several limitations such as different antibodies, variations among observers and the different values for separating low from high ERCC1 expression. This suggests that inconsistent prognostic interpretations of ERCC1 might have been influenced by the scoring system which emphasis the need for consensus about methodology [22]. Furthermore, the ERCC1 evaluation by IHC is questionable, because ERCC1 is present as four isoforms in the nucleus, but only one of them (isoform 202) was involved in the repair of platinum adducts. [23]. These observations could have been one of the possible explanation for discrepancy among the studies. Currently, none of the available antibody, allows for differentiating between four ERCC1 isoforms, leading to possibility of wrong evaluation and classification of ERCC1 expression. More valid method for ERCC1 analysis is RT-PCR for detection of the mRNA from tumor tissue. Prospective studies, mentioned above were conducted using paraffin blocks of tumor biopsies, previously fixed in formalin for mRNA extraction. Formalin destroys the mRNA, so tumor samples should be taken for ERCC1 analysis before fixation to avoid wrong evaluation of ERCC1 expression [19].
We assumed that the small sample tissue, as a commonest, and derived from bronchial biopsies, would be sufficient for IHC analysis of ERCC1 expression and representative for the total tumor despite of tumor heterogeneity, according to Taillade et al. who reported a high correlation for ERCC1 expression comparing bronchial biopsies and resected surgical specimens in the same patient [24].
In our research, beside ERCC1, a smaller tumor size was found out to be a factor of better prognosis which correlates with the findings of Rami-Porta et al. [25]. They emphasized the importance of the new 8thTNM staging system where T1 lesions were subdivided into T1a, T1b, and T1c lesions corresponding to lung cancers up to 10 mm, between 11 and 20 mm, and between 21 and 30 mm, respectively [10]. Prognosis was significantly better for the smallest lesions, as 5-year survival rates for clinical staging were 92, 83, and 76% for T1a, T1b, and T1c cancers, respectively [25]. It is obvious that tumour size is an important prognostic factor.
The prognosis of NSCLC has been changed with immunotherapy but without the long-term benefit for many patients. The association of ERCC1 with immunotherapy response was analysed, assuming that ineffective ERCC1 increases defects in the DNA of tumor cells and causes stronger immune response to the tumor. Chabanon et al. revealed correlation between low expression of ERCC1 and better response to immunotherapy due to increased neo-antigens in tumor cells [26]. It seems that ERCC1 has remained not only an important predictive marker of chemotherapy based on platinum, but it could also be a predictor of immunotherapy response.

Conclusion

Our data indicated that high ERCC1 expression is a valuable negative prognostic marker in patients with lung adenocarcinoma. Novelty of the present study is that low ERCC1 expression is confirmed as a good predictive marker in all stages of lung adenocarcinoma in patients treated with platinum-based chemotherapy alone, or in combination with surgery or radiotherapy. IHC is a valuable method to evaluate the ERCC1 status, but consensus on the selection of most reliable antibody has to be achieved and values for separating low from high ERCC1 expression have to be established to avoid wrong classification of ERCC1 status. In the century of immunotherapy, ERCC1 is recognised as predictor of better response to check point inhibitors. Additional efforts have to be made to determine predictive markers to any therapeutic modality which could result in patients benefit.

Acknowledgements

Not applicable.
The study was approved by Ethics Committee of the Hospital (code 500–03/15/01/42).
Not applicable.

Competing interests

The authors declare that they have no competing interest.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://​creativecommons.​org/​licenses/​by/​4.​0/​), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://​creativecommons.​org/​publicdomain/​zero/​1.​0/​) applies to the data made available in this article, unless otherwise stated.

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Metadaten
Titel
Low ERCC1 expression is a good predictive marker in lung adenocarcinoma patients receiving chemotherapy based on platinum in all TNM stages - a single-center study
verfasst von
Marina Piljić Burazer
Suzana Mladinov
Antonela Matana
Sendi Kuret
Joško Bezić
Merica Glavina Durdov
Publikationsdatum
01.12.2019
Verlag
BioMed Central
Erschienen in
Diagnostic Pathology / Ausgabe 1/2019
Elektronische ISSN: 1746-1596
DOI
https://doi.org/10.1186/s13000-019-0885-2

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