J Cancer 2016; 7(7):794-802. doi:10.7150/jca.15097

Research Paper

Survival and Quality of Life Benefit after Endoscopic Management of Malignant Central Airway Obstruction

Grigoris Stratakos1, Vasiliki Gerovasili2, Charalampos Dimitropoulos1, Ioannis Giozos3, Filippos T. Filippidis2, Sofia Gennimata1, Paul Zarogoulidis4 Corresponding address, Athanasios Zissimopoulos5, Athanasia Pataka4, Nikos Koufos1, Spyros Zakynthinos2, Konstantinos Syrigos3, Nikos Koulouris1

1. 1st Pulmonary Medicine Department of National and Kapodistrian University of Athens, “Sotiria” General Hospital Athens, Greece;
2. 1st Respiratory and Critical Care Medicine department of National and Kapodistrian University of Athens, “Evangelismos” Hospital Athens, Greece;
3. Oncology Unit, 3rd Department of Internal Medicine of National and Kapodistrian University of Athens, “Sotiria” General Hospital, Athens, Greece;
4. Pulmonary Oncology Unit, “G. Papanikolaou” General Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece;
5. Nuclear Medicine Department, University General Hospital of Alexandroupolis, Democritus University of Thrace, Alexandroupolis, Greece.

This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY-NC) License. See http://ivyspring.com/terms for full terms and conditions.
How to cite this article:
Stratakos G, Gerovasili V, Dimitropoulos C, Giozos I, Filippidis FT, Gennimata S, Zarogoulidis P, Zissimopoulos A, Pataka A, Koufos N, Zakynthinos S, Syrigos K, Koulouris N. Survival and Quality of Life Benefit after Endoscopic Management of Malignant Central Airway Obstruction. J Cancer 2016; 7(7):794-802. doi:10.7150/jca.15097. Available from http://www.jcancer.org/v07p0794.htm

Abstract

Background: Although interventional management of malignant central airway obstruction (mCAO) is well established, its impact on survival and quality of life (QoL) has not been extensively studied.

Aim: We prospectively assessed survival, QoL and dyspnea (using validated EORTC questionnaire) in patients with mCAO 1 day before interventional bronchoscopy, 1 week after and every following month, in comparison to patients who declined this approach.

Material/Patients/Methods: 36 patients underwent extensive interventional bronchoscopic management as indicated, whereas 12 declined. All patients received full chemotherapy and radiotherapy as indicated. Patients of the 2 groups were matched for age, comorbidities, type of malignancy and level of obstruction. Follow up time was 8.0±8.7 (range 1-38) months.

Results: Mean survival for intervention and control group was 10±9 and 4±3 months respectively (p=0.04). QoL improved significantly in intervention group patients up to the 6th month (p<0.05) not deteriorating for those surviving up to 12 months. Dyspnea decreased in patients of the intervention group 1 month post procedure remaining reduced for survivors over the 12th month. Patients of the control group had worse QoL and dyspnea in all time points.

Conclusions: Interventional management of patients with mCAO, may achieve prolonged survival with sustained significant improvement of QoL and dyspnea.

Keywords: lung cancer, intervention, quality of life.

Introduction

Malignant tumors may produce central airway obstruction (CAO) causing severe dyspnea, significant morbidity and mortality.[1] Lung cancer patients develop CAO in as much as 30% of cases while up to 40% of the deaths are attributed to loco-regional progression.[2] Chemo- and radio-therapy alone, seldom can alleviate airway obstruction due to non-small cell lung cancer (NSCLC). Most patients present at advanced stage while surgical interventions are rarely indicated for tumors of the trachea and main carina. In these cases, interventional therapeutic bronchoscopy remains an important alternative method for airway management.[3-5]

Reported survival of patients with untreated malignant CAO usually ranges from 1 - 2 months with many of them dying of asphyxia or on mechanical ventilation.[6] Although the palliative effect of endoscopic management of mCAO is well established[7], the long-term effect of these techniques has seldom been examined in terms of quality of life (QoL) and survival. Several authors have argued that temporary relief of dyspnea may lead to prolonged suffering from the patient's point of view.[8] It is therefore necessary to elucidate whether there is a clear QoL and survival benefit after interventional management in patients with inoperable malignant CAO.

Main reasons for lack of prospective, controlled studies on survival and QoL should be methodological and ethical issues. Most studies investigate partially dyspnea and performance status scores but not overall QoL.[9-18] To the authors' knowledge there are only two prospective studies regarding multimodality approach in malignant CAO that include QoL questionnaires but without comparing the results to standard oncologic treatment nor elucidating the impact on survival or QoL.[19-21]

Our aim was to prospectively assess the effect of interventional bronchoscopic procedures when added to the standard oncologic treatment, in patients with inoperable mCAO. Primary objectives included assessment of dyspnea and overall QoL, as well as survival, in comparison to patients who declined interventional management and thus acted as control group. Secondary objective was to identify pre-procedural clinical, radiological or endoscopic characteristics which might correlate with poor post-procedural outcome. We hypothesized that re-establishing airway patency in symptomatic patients with inoperable mCAO would result in substantial symptomatic relief, improved QoL and increased survival.

Methods

Study Design

This is a prospective study performed over a 3 years period at a University Hospital. Approval was obtained from the Hospital's ethical committee and patients gave signed informed consent before enrolment. Patients declining interventional management were also evaluated and formed the control group.

Subjects

All consecutive patients symptomatic due to inoperable malignant CAO, other than small cell lung cancer, were initially evaluated with thorax CT and video-bronchoscopy. Indication for interventional management was considered after interdisciplinary counselling with interventional pulmonologist, thoracic surgeon and oncologist. Patients were excluded if other medical conditions could be responsible for the symptoms, if they had irreversible bleeding diathesis, severe cardiopulmonary compromise or inability to tolerate bronchoscopy. The patients underwent bronchoscopic recanalization of the airway (Intervention group) and subsequently followed standard oncologic chemo-radio therapy, according to international guidelines. If the patients, for any reason, declined the interventional approach, then sole standard oncologic management with chemo-radio therapy was offered (Control group). All patients were followed for QoL and performance status every month up to their death.

 Interventional Bronchoscopic procedures

Both flexible and rigid bronchoscopy were used, applying all available in our institution interventional modalities (namely electro-cryotherapy, rigid bronchoscopy and stent placement), according to the specific situation and the published evidence.[1, 4, 5] The procedure was considered successful when complete re-establishment of the airway patency was achieved with post-intervention lumen 80-100% of normal width. Partially successful if the post-intervention patency was 50-80%, and unsuccessful if the patency remained less than 50% of normal width. In case of relapse of the stenosis and worsening of the symptoms during follow up, interventional bronchoscopy was repeatedly performed as needed to re-establish patency.

 QoL and Symptom assessment

 All patients were assessed before enrolment with the Eastern Cooperative Oncology Group (ECOG) score for the performance status while dyspnea and QoL were assessed with the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire (EORTC QLQ-C30) being the most frequently used and well documented in European countries and validated in Greek language.[22-27] EORTC QLQ-C30 consists of five functional and three symptom scales, as well as a specific lung component with 15 questions assessing respiratory symptoms in detail. Dyspnea is assessed both by the overall questionnaire and the lung component questions (LC dyspnea). The initial evaluation was followed by an assessment 1 week after establishment of airway patency for the intervention group and then every following month for both groups until eventual death of the patients.

Statistical Analysis

All continuous variables are presented by mean ± SD. Normality of distribution was checked by Kolmogorof-Smirnof test. Continuous variables were compared by unpaired Student's t-test or Mann-Whitney U test when appropriate. Qualitative variables were compared by χ2 or Fisher exact test. The within-patient changes of the intervention group before and after the intervention were evaluated with paired t-test or paired Wilcoxon test when appropriate. Within-patient changes in both groups were analyzed using Linear Mixed Effects (LME) Modeling.

Kaplan-Meier method was used to compare survival between intervention and control group. Survival time was defined as time from the endoscopic diagnosis of inoperable malignant CAO until death. The two groups were compared using the log-rank test. The direct effect of the intervention upon overall patient survival was analyzed and quantified through Cox Proportional Hazards modeling. P values <0.05 were considered significant.

Results

During the 3 years study period 53 patients were enrolled in the study. Two subjects were excluded because after interventional bronchoscopic management, they qualified for curative surgical treatment. 5 patients presenting with metastatic extra-thoracic malignancy were analyzed separately. Thus the final analysis was performed on 46 patients (38 males) aged 66 ±11 years.

Thirty-four patients with NSCLC underwent extensive interventional bronchoscopic management as indicated (intervention group), whereas 12 declined endoscopic treatment (control group) (Table 1). Patients of the 2 groups did not statistically differ in terms of age, gender, type or stage of malignancy and presence of atelectasis, time between diagnosis and enrollment (Table 1). There was a difference regarding the level of obstruction, which in the intervention group patients was more often located centrally than in the patients of the control group. Diagnosis of COPD was less often reported in the intervention group, although in this group dyspnea severity was worse.

Following intervention (n=34), most patients had an improvement in their airway diameter. 14 patients (41%) were considered to have had a successful procedure, 17 patients (50%) had only partially successful procedure and in 3 patients (8.8%) the procedure was considered unsuccessful. Nine patients underwent retreatment after 5 ± 4 (range 1-11) months.

Overall follow up time was 8.6±8.5 (range 1-43) months. Seven patients are still alive (5 in the intervention group and 2 in the control group) followed for 14 ± 16 (range 1-43) months. Mean survival time for intervention and control group was 10±9 and 4±3 months, respectively (log rank p=0.005) (Figure 1). The hazard ratio was modeled through cox proportion hazards modeling where it was observed that the death hazard increases by 2,93 times without interventional management of CAO (p=0.009).

 Table 1 

Baseline characteristics of the patients.

Intervention Group (n=34)Control Group (n=12)p
Age  (years)65±1266±80,96
Gender  n, (%)0,66
male27 (79,4%)11 (91,7%)
female7 (20,6%)1 (8,3%)
Comorbidities  n, (%)0,17
yes20 (58,8%)10 (83,3%)
no14 (41,2%)2 (16,7%)
COPD 0,013
yes8 (23,5%)8 (66,7%)
no26 (76,5%)4 (33,3%)
CHF1,00
yes6 (17,6%)2 (16,7%)
no28 (82,4%)10 (83,3%)
ICD1
yes8 (23,5%)3 (25%)
no26 (76,5%)9 (75%)
Long term oxygen therapy0,72
yes11 (32,4%)3 (25%)
no23 (67,6%)9 (75%)
Histotype of Lung Cancer Malignancy n,(%)0,76
squamous25 (75,8%)8 (66,7%)
adenocarcinoma5 (15,2%)3 (25%)
large cell carcinoma1 (3%)0
non differentiated1 (3%)1 (8,3%)
other1 (3%)0
Stage of Malignancy n,(%)
T39 (26,5%)1 (8,3%)0,41
T425 (73,5%)11 (91,7%)
N02 (5,9%)0 (0%)0,50
N14 (11,8%)3 (25%)
N218 (52,9%)7 (58,3%)
N310 (29,4%)2 (16,7%)
M024 (70,6%)5 (41,7%)0,09
M110 (29,4%)7 (58,3%)
Atelectasis  n,(%)0,17
yes16 (48,5%)9(75%)
no17 (51,5%)3(25%)
Level of Obstruction n,(%)<0.001
trachea28(52,9%)1(8,3%)
main stem15(44,1%)6(50%)
lobar bronchi1(2,9%)5(41,7%)
ECOG  score2.7±12±1.30,1
Global Health42±2844±280,8
Physical Function41±2951±290,29
Dyspnea79±2653±300,005
LC dyspnea66±3050±330,13
LC coughing66±3061±240,64
LC Hemoptysis33±2922±290,26

COPD: Chronic Obstructive Pulmonary Disease, CHF: Chronic Heart Failure, ICD: Ischemic Coronary Disease, NSCLC: non-small cell lung cancer, ECOG: Eastern Cooperative Oncology Group, LC: Lung Component of EORTC questionnaire.

 Figure 1 

Kaplan Meier curves showing survival after diagnosis of airway obstruction in patients of the intervention group as compared to the control group.

J Cancer Image (Click on the image to enlarge.)

As shown in Table 2, global health EORTC scores compared with pre-intervention values, significantly improved in all patients of the intervention group one week post intervention and remained improved up to the 3rd month, in all surviving patients (n=26) (p<0.05). EORTC scores did not deteriorate in patients surviving up to 12 months after the intervention (n=9) as compared to one week post intervention values (p>0.05). Dyspnea significantly decreased in all surviving patients of the intervention group one month after the procedure (n=34) (p<0.05). For those surviving over the 6th (n=19) and over the 15th (n=6) month dyspnea remained significantly improved (p<0.05). Physical function immediately improved post intervention remaining high even 12 months post intervention for surviving patients (p<0.05). Coughing and hemoptysis decreased significantly in intervention group patients remaining low, up to the 9th month (Table 2).

Regarding pre-intervention patient characteristics, patients initially presenting with atelectasis had greater and sustained improvement in EORTC global health component at 1 month compared to those without atelectasis (+26.1±29.3 vs 3.3±30.6; p=0.047). All other pre-intervention parameters (age, gender, type of malignancy, level of CAO, metastases or co-morbidities, LTOT, previous chemo- radio therapy, base line EORTC assessment) did not significantly influence outcomes.

Between the 1st and the 6th month post intervention, control group patients had significantly lower quality of life (p<0.05) and higher dyspnea (p<0.05) (Figure 2, Table 3). After 6th month, not enough control group patients were alive to conduct comparative analysis.

Linear Mixed-effects Modeling was performed for both groups to confidently model the patient's course through time as described by specific parameters. The parameters analyzed were Global QoL, Physical Function, Dyspnea, LC-Dyspnea, LC-Cough and LC-Haemoptysis. The Intervention-Group was modeled from 1 week after the intervention onwards while the control group was modeled from the whole dataset (Table 4). Global QoL parameter reveals that, although control group patients had significantly lower QoL, rates of deterioration for the two groups did not differ significantly (-3,26 vs -2,07). Regarding the 'Physical Function' parameter, the intervention group patients deteriorate at a slower rate than those of the control group (-2,89 vs -1,47) while regarding the 'Dyspnea' parameter, the intervention group patients deteriorate at a much slower rate than those of the control group (2,73 vs 4,34 respectively for overall dyspnea and 2,96 vs 2,04 for LC dyspnea). 'LC-Cough' & 'LC-Haemoptysis' did not present a linear pattern versus time, adequate for this analysis.

 Table 2 

ECOG scores and the QoL, physical function, dyspnea, LC dyspnea, LC coughing and LC hemoptysis values of the  EORTC questionnaire in the surviving patients of the intervention group  up to 18 months post intervention.

pre intervention
value  (n=34)
post 1 
week
(n=34)
post 1
month 
(n=34)
post 3
months 
(n=26)
post 6
months 
(n=19)
post 9 months  (n=16)post 12 months  (n=9)post 15 months  (n=6)post 18
months 
(n=3)
ECOG2.7±12 ±1.4*2.4±1.3*2.3±1.52.1±1.52.3±1.51.4±1.1*2.5±1.52±1
Global Health42±2864±18*57±20*57±26*62±2148±3257±2460±2147±19
Physical Function41±2955±32*55±31*57±36*63±3049±3467±22*54±2051±31
Dyspnea79±2635±34*39±37*45±36*37±37*47±41*41±22*39±39*67±58
LC dyspnea66±3033±27*35±29*33±34*32±24*50±3741±17 *41±3350±35
LC coughing66±3042±29*42±37*42±30*31±25*40±38*37±3549±3522±38
LC Hemoptysis33±2915±19*12±22*10±19*31±2518±25 *11±17*22±2711±19

ECOG: Eastern Cooperative Oncology Group, LC: lung component ,values are expressed as mean±SD, * significant compared to pre-intervention values.

 Figure 2 

Global QoL (QL2), Physical function (PF2) and Level of Dyspnea (DY) assessed with the EORTC questionnaire in patients of the intervention group in comparison to the control group. (Error bars represent mean   ±  2SE).

J Cancer Image (Click on the image to enlarge.)
 Table 3 

Comparison of the two groups at base line and during follow up to 6 months.

BaselinePost 1 month3months6months
Global Health
Intervention Group42±28 (n=34)57±21 (n=31)57±26 (n=23)62±21 (n=17)
Control Group44±28 (n=12)30±21 (n=10)*29±17 (n=6)*28±19 (n=3)*
Physical Function
Intervention Group41±29 (n=34)55±31 (n=31)57±36 (n=23)63±30 (n=17)
Control group51±29 (n=12)29±24 (n=10)*34± 32 (n=6)*13±23 (n=3)*
Dyspnea
Intervention Group79±26 (n=34)39±37 (n=31)45±36 (n=23)37±37 (n=17)
Control Group53±30 (n=12)*57±35 (n=10)*61±25 (n=6)*78±38 (n=3)*
LC dyspnea
Intervention Group66±30 (n=34)35±29 (n=31)33±34 (n=23)32±25 (n=17)
Control Group50±33 (n=12)65±27 (n=10)*70± 31 (n=6)*78±11 (n=3)*
LC coughing
Intervention Group66±30 (n=34)42±37 (n=31)42±31 (n=23)31±25 (n=17)
Control Group61±24 (n=12)57±32 (n=10)44±17 (n=6)11±19 (n=3)
LC Hemoptysis
Intervention Group33±29 (n=34)12±22 (n=31)10±19 (n=25)6±13 (n=17)
Control Group22±29 (n=12)13±17 (n=10)11±17 (n=6)44±51 (n=3)

LC Lung Component, *significantly different when compared to intervention group.

 Table 4 

Linear Mixed-Effects (LME) Analysis of the intervention and control groups for specific parameters.

Intervention GroupControl Group
InterceptCoefficientP-valueTime to Intervention Group Initial Values (months)InterceptCoefficientP-value
Global Health62,21-3,26<0.0016,8729,53-2,070,057
Physical Function56,53-2,890.0015,2129,92-1,470,466
Dyspnea35,372,730,00721,1753,864,340,006
LC-Dyspnea29,912,960.00112,4969,092,040,072
LC-Cough38,740,650,408NA67,83-6,770,007
LC-Haemoptysis10,830,090,761NA6,373,390,303

LME analysis was performed in order to confidently quantify the patients' course over time as described by each parameter. Intercepts and coefficients are characteristics of the linear models. Intercepts indicate the value of each parameter at Time=0. Coefficients are an indication of the rate of change of each parameter as time passes on a monthly basis. The p-values indicate the validity of the modelling. “Time to Intervention-Group Initial Values” parameter indicates the time lapse in months as calculated by the linear model, until the intervention group patients reached the pre-intervention values; hence it is an indication of the time 'gained' by the patients in terms of quality of life, dyspnea severity etc. and was calculated only for the parameters having a statistically significant linear model.

Discussion

Patients with advanced NSLC and CAO have poor prognosis and left untreated their survival usually does not exceed few weeks.6 Although therapeutic bronchoscopy has been previously reported to relieve symptoms of cough, dyspnea and hemoptysis, achieving endoscopic, radiologic, spirometric and QoL improvements, it is generally considered as a palliative measure not able to essentially prolong patients' survival.[8, 17-21]

The present prospective study provided detailed assessment of the impact of interventional bronchoscopy in patients with inoperable malignant CAO versus matched patients undergoing only standard oncologic treatment. Using a validated tool we were able to assess symptoms, overall and respiratory specific QoL as well as long term survival of these patients. The results demonstrate that interventional approach may achieve significant and sustained QoL and dyspnea improvement together with prolonged survival in patients with airway obstructing malignancies.

In previous studies assessing the impact of bronchoscopic treatment in patients with inoperable malignant CAO, either only one bronchoscopic modality was studied each time or no other systemic therapy towards their malignancy was administered.[6, 17, 20] However, interventional bronchoscopy using all available modalities together, may serve as a bridge to radiation and/or chemotherapy, allowing for a durable relief of symptoms.[11] All our patients improved clinically after the intervention and were able to sustain further oncologic treatment while two subjects even qualified for curative surgical treatment.

In our study cohort although all patients were offered the option of therapeutic bronchoscopy after interdisciplinary counseling several declined bronchoscopic treatment. These were patients with more distal level of obstruction, higher prevalence of COPD and lower grade of dyspnea according to the general component of the EORTC questionnaire. We hypothesize that prior dealing with COPD symptoms in combination with fear of complications, given their lower level of dyspnea, and less prominent obstructive symptoms was the main drawback of these patients to accept bronchoscopic treatment.

A limitation of our study is the small population rendering subgroup analysis limited albeit useful for generating hypotheses. Furthermore, the results of the QoL questionnaire were not correlated with objective respiratory functional testing. This would have been quite demanding given the advanced disease and the level of dyspnea of most patients.

There are several potential explanations of the survival benefit observed in our patient population undergoing interventional management: Timely management of malignant CAO may prevent or delay lethal complications such as post-obstructive pneumonia, sepsis and respiratory insufficiency, thus allowing adjuvant chemotherapy and external beam radiation to prolong survival.[21] In our study, patients treated bronchoscopically survived more than twice as long as patients treated only by standard oncologic treatment.

In a recent study Oviat et al. showed significant improvement of 6 min walking distance, FEV1 and FVC, dyspnea and QoL scores by day 30 post-intervention, not being able whatsoever to report longer follow up of their patients.[19] Similarly, Amjadi et al. reported decreased dyspnea but not significant QoL benefit one month post-intervention20. However, in our study in which patients were meticulously followed up to their death, validated EORTC QLQ-C30 QoL questionnaire produced much more encouraging data.

Overall, dyspnea, significantly decreased one month post-intervention and as LME analysis reveals it would take approximately 21 months for the patients of the intervention group to reach their pre-intervention values. This is extremely considerable given that average survival time of the control group is only 4 months and that of the intervention group is approximately 10 months. This means that most of the patients of the intervention group do not survive long enough to experience dyspnea as severe as the one they experienced before the intervention. Equally important, 'Global Quality of Life' measurements of the intervention group significantly improved immediately after intervention, while deterioration rate remained close to the one of the control group. This is expected since the intervention of the current study is only a means to palliate symptoms and facilitate other applied therapeutic strategies. Additionally LME analysis revealed that it takes approximately 7 months for the intervention group patients to reach their pre-intervention 'Global Quality of Life' values. Finally, 'Physical Function' improved in all patients of the study group immediately after intervention. LME analysis reveals that the deterioration rate is lower in the intervention group and that it would take approximately 5 months for the patients of the intervention group to reach their pre-intervention values.

To our knowledge there are not any other data in the literature reporting dyspnea and QoL assessment for such a long follow up period compared or not to a control group. Subgroup analysis of the pre-procedural clinical, radiological and endoscopic characteristics revealed that QoL and Dyspnea improvement was greater in patients initially presenting with atelectasis. All other parameters did not significantly influence treatment outcomes. 

Recent ACCP Lung Cancer Guidelines mention several interventional bronchoscopic modalities for palliation of dyspnea due to inoperable malignant CAO.[28] The results of the present prospective, controlled study confirm the considerable benefit of interventional bronchoscopic management of such patients and make an argument that patients with malignant CAO treated endoscopically have less dyspnea, better QoL, improved physical function and longer survival than patients with oncologic treatment alone. Combined interventional and oncologic treatment should be considered in any multidisciplinary cancer care program and offered to all patients with lung cancer and inoperable CAO, especially when post-obstructive atelectasis is present. Since such an approach is often limited by the lack of interventional equipment and skills, the urgent need for respiratory physicians' training in therapeutic bronchoscopy and development of interventional units is also highlighted.[29] (Figures 3-8) Additional treatment with radiotherapy could be used based on the patient performance status and local interventional prior or after stent placement-debulking.[30-36] Multimodality treatment is necessary for patients with central tumors local treatment should be accompanied with systematic treatment when possible.

 Figure 3 

Argon Plasma Coagulation.

J Cancer Image (Click on the image to enlarge.)
 Figure 4 

LASER beam coagulation.

J Cancer Image (Click on the image to enlarge.)
 Figure 5 

Cryoprobe performing debulking of central airways malignnat tumor.

J Cancer Image (Click on the image to enlarge.)
 Figure 6 

Bifurcated silicone stent.

J Cancer Image (Click on the image to enlarge.)
 Figure 7 

Rigid electrocatery.

J Cancer Image (Click on the image to enlarge.)
 Figure 8 

Removal of endobronchial tumor with loop.

J Cancer Image (Click on the image to enlarge.)

Acknowledgements

We would like to cordially thank Research Scientist Dr K. Vougas, from the, Biomedical Research Foundation, Academy of Athens, Athens, Greece, for his valuable assistance in the statistical analysis and the presentation of the data of this study.

Conflict of Interest

None to declare.

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Author contact

Corresponding address Corresponding author: Paul Zarogoulidis, M.D, PhD. Pulmonary Department-Oncology Unit, “G. Papanikolaou” General Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece. Fax: 00302310992424 Mobile: 00306977271974 E-mail: pzarogcom.


Received 2016-1-26
Accepted 2016-3-21
Published 2016-4-25