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DOI: 10.1055/s-0039-1679884
Major Pathologic Response after Induction Therapy Has a Long-Term Impact on Survival and Tumor Recurrence in Stage IIIA/B Locally Advanced NSCLC
Abstract
Background Major pathologic response (MPR) determines favorable outcome in locally advanced non-small cell lung cancer after induction therapy (IT) followed by lung resection. The aim of this retrospective study was to identify the prognostic relevance of MPR in long-term interval.
Methods In 55 patients, the survival rate according to MPR and non-MPR was estimated by Kaplan–Meier method and compared using log-rank, Breslow, and Tarone–Ware tests.
Results The IT included chemoradiation with 50.4 Gy (range: 45–56.4 Gy) combined with platinum-based chemotherapy in 52 patients (94.5%) and platinum-based chemotherapy in 3 patients (5.5%). Perioperative morbidity and 30-day mortality were 36 and 3.6%, respectively. The estimated 5-year postoperative and progressive-free survivals were statistically significantly improved in MPR versus non-MPR with 53.5 versus 18% and 49.4 versus 18.5%, respectively. According to the log-rank, Breslow, and Tarone–Ware tests, the MPR demonstrates prognostic significance in early, long-term, and whole postoperative interval.
Conclusion MPR is associated with a robust correlation to long-term postoperative and recurrence-free survival improvement, and can potentially simplify the multidisciplinary debate and allow further stratification of adjuvant treatment in multimodality therapy.
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Keywords
major pathologic response - locally advanced non-small cell lung cancer - induction therapy - stage IIIIntroduction
The effective treatment of the locally advanced stage IIIA/B non-small cell lung cancer (NSCLC) is a subject of the ongoing multidisciplinary debate. Stage IIIA/B NSCLC is heterogeneous and includes variable extent of the mediastinal lymph node disease, ranging from micrometastasis to bulky lymph nodes, and various tumor size up to a bulky lesion invading the neighboring anatomic structures.[1] [2] The induction therapy (IT) followed by surgery and definitive chemoradiation are accepted treatment modalities in patients with locally advanced NSCLC. The therapeutic rationale for IT includes, in particular, a downstaging of the disease, improvement of the tumor resectability, and systemic treatment of potential distant micrometastasis.[3] [4] In this context, the pathologic complete response (pCR), defined as an absence of viable tumor cells in all specimens, was identified an dominant prognostic factor, but the pCR estimation in preoperative setting appears inaccurate. Especially, the pCR incidence rate is inconsistent and widely variable depending on IT protocol. In contrast, the major pathologic response (MPR), defined as evidence of <10% viable tumor cells, is more commonly present after IT and is also associated with improved overall and recurrence-free survivals.[5] Therefore, the MPR has recently been proposed a primary surrogate for better patient outcome in multimodality treatment.[6] [7] We performed a retrospective analysis of the patients who underwent IT followed by curative surgery for locally advanced stage IIIA/B NSCLC to identify the prognostic effect of MPR in long-term follow-up interval.
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Materials and Methods
A cohort of patients with locally advanced NSCLC in stage IIIA/B treated with IT and subsequent surgery at single center was retrospectively reviewed. Pretreatment staging was based on the computed tomography (CT), 18F-fluorodeoxyglucose positron emission tomography (FDG-PET) and cranial magnetic resonance imaging. The PET-positive mediastinal lymph nodes were further investigated with fine-needle transbronchial biopsy and/or videomediastinoscopy. Preoperative restaging included CT and/or FDG-PET. Persisted enlarge and FDG-active mediastinal lymph nodes after IT were further investigated by invasive procedures to exclude distant metastasis and extensive mediastinal lymph node involvement.
The IT was performed either as neoadjuvant chemoradiotherapy or neoadjuvant chemotherapy. The course of neoadjuvant chemoradiotherapy was standardized and included platinum-based chemotherapy (cisplatin 20 mg/m2/d on days 1 to 5 in weeks 1 and 5, and etoposide 90 mg/m2/d on day 3 in weeks 1 and 5) with concomitant concurrent high-dose radiation of up to 50.4 Gy applied to the primary lesion and to the mediastinal lymph nodes. In three patients with central tumor location, a platinum-based neoadjuvant chemotherapy was performed without radiation to avoid a radiation-related bronchial stump insufficiency. The therapy regimen was in accordance with tumor histology.
Patient selection for surgery after IT was in accordance with the response evaluation criteria in solid tumors (RECIST) and took place within the multidisciplinary conference.[8] Only patients with radiological complete/partial regression and stable disease were offered surgery within 6 to 8 weeks after IT. In patients with progressive disease, unresectable T4-tumor and pathologic proven N3-stage or with reduced cardiopulmonary status, the surgery was denied. At least lobectomy with pathologic proven complete resection on the bronchial stump margin and pulmonary vessels (R0) were defined as oncological adequate. The lymph node dissection involved all ipsilateral mediastinal lymph nodes, irrespective of the tumor location.
The preoperative clinical data, patient characteristics including the clinical, pathologic tumor stage, and surgical features were collected. The degree of tumor response to the IT, extent of surgery, completeness of resection, number of dissected lymph nodes, perioperative morbidity and mortality, postoperative survival (POS) and progressive-free survival (PFS) rate, local (bronchial stump), locoregional (ipsilateral pulmonary and mediastinal lymph nodes), and distant (other organs or contralateral lung) recurrence, as well as tumor-related deaths were subjects of further analysis. Survival of more than 36 months was defined as long-term survival (LTS).
The pathologic workup was performed according to the Junker classification to identify the pathologic response.[9] The patient group with pCR (Junker III) and pathologic near to complete response (Junker IIb) was labeled as “MPR.”[10] Patients without response signs (Junker I) and with only insufficient pathologic response (Junker IIa) were described as “non-MPR.” The clinical and pathologic tumor staging was based on the seventh edition of the TNM classification for NSCLC.[11] The statistical analysis was performed using SPSS (version 21, IBM) and stratified by descriptive statistics, chi-square correlation analysis, Kaplan–Meier survival curves, and estimated 3- and 5-year survivals. The statistical significance in survival was analyzed by log-rank, Breslow, and Tarone–Ware tests to identify the better prognosis in the whole, early, and long-term postoperative courses, respectively. For all tests, the p-value of <0.05 was considered statistically significant.
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Results
Between March 2008 and January 2017, a total of 75 patients with stage IIIA/B NSCLC have been offered the IT in the interdisciplinary tumor conference. After the IT completion, 20 (27%) patients were excluded from surgery for different reasons ([Fig. 1]). Finally, 55 (73%) patients underwent curative pulmonary resections following the IT, including neoadjuvant radiochemotherapy in 52 (94.5%) patients and neoadjuvant chemotherapy in 3 (5.4%) patients. Based on degree of the pathologic response, 35 patients (46%) were assigned to the MPR group, whereas 20 patients (27%) were assigned to the non-MPR group. The patient characteristics and preoperative data are given in [Table 1]. The mean length of perioperative hospital stay was 19.5 ± 1.8 days. The 30-day mortality rate was 3.6% (n = 2) due to postoperative adult respiratory distress syndrome on the 7th day after pneumonectomy and acute right heart failure resulting from pulmonary embolism. The median follow-up was 35.5 months (range, 6–112 months). The perioperative data and histological findings are presented in [Table 2]. The lung resection was complete in 51 (92.7%) patients, whereas in 4 patients (non-MPR group), a perivascular (n = 1), peribronchial (n = 1) tumor invasion and tumor infiltration of resection margin (n = 2) were microscopically identified. The detailed patient status at the end of the follow-up and the patterns of tumor recurrence are presented in [Table 3].
Abbreviations: ASA, American Society of Anesthesiologists; MPR, major pathologic response.
Abbreviations: ICU, intensive care unit; MPR, major pathologic response.
Abbreviation: MPR, major pathologic response.
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Based on Kaplan–Meier method, the estimated 3- and 5-year POSs for patients with MPR versus non-MPR were 60 and 36% versus 53.5 and 18%, respectively. The estimated 3- and 5-year PFS for patients with MPR versus non-MPR was 60 and 30% versus 49.4 and 18.5%, respectively. The median POS and PFS in the MPR group were not reached, whereas the median POS and RFS in the non-MPR group were 35.6 and 10 months, respectively. According to the log-rank, Breslow, and Tarone–Ware tests, significantly improved postoperative and PFSs in whole, early, and long-term postoperative courses between MPR and non-MPR groups could be identified ([Fig. 2]). In addition, the LTS was noted in 22 patients, predominantly in the MPR group (n = 16). During the follow-up, the tendency to diffuse distant metastasis was present in non-MPR group, whereas in MPR group, oligometastasis was dominant.
![](https://www.thieme-connect.de/media/thoracic/202007/thumbnails/10-1055-s-0039-1679884-i185355-2.jpg)
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Discussion
The choice of effective multimodality therapy for stage IIIA/B locally advanced NSCLC is, through the patient heterogeneity, very challenging. Particularly, the selection of appropriate candidates for post-IT curative resection is crucial and requires surgical assessment of tumor resectability within multidisciplinary settings based on accurate restaging. Even after consideration of the whole spectrum of invasive and noninvasive procedures, the restaging assessment still inaccurately predicts the pathologic response to IT.[4] According to RECIST criteria, there are no demographic, radiologic, and treatment-related preoperative predictors of the pathologic response degree. The utility of standard CT to assess the response after IT remains limited and did not well correlate with pathologic response.[12] The PET response to IT demonstrated a significant number of false-negative and false-positive results. Therefore, clinical application of the standard uptake value (SUV) changes after IT, to quantify the pathologic response in the primary tumor, has relevant limitations.[13] Moreover, the preoperative restaging is usually performed 4 to 6 weeks following the IT and therefore too early to detect the maximal tumor response.[14] Respecting those findings, the substantial assessment of the response grade is only achievable through the surgical resection. However, the selection of best candidates for surgery is often based on more subjective assessment of resectability and the selection criteria are still to be clearly defined.[4] [15]
On the one hand, the tumor resection for pathologic examination seems reasonable, as long as the tumor appears resectable, to identify the best effective IT protocol and, subsequently to extend the treatment modality to a larger patient number in terms of better outcome.[4] [16] The pCR was recently identified as a dominant prognostic factor for LTS and PFS, superior to mediastinal downstaging, female gender, and patient age.[17] On the other hand, even accepting the fact that the pCR after IT is the main prognostic determinant in locally advanced NSCLC patients, the clinical implication into daily clinical practice is difficult due to the wide incidence variability after IT, inconsistent presentation, and inaccurate clinical–radiological preoperative estimation. In addition, the prognostic value of pCR (Junker III) in comparison to near to complete response, defined by Junker as group IIb, failed to be statistically relevant. Based on those findings, both groups were classified by Junker as the “responder” subgroup demonstrating statistically better prognosis compared with patients without (Junker I) and/or with only insufficient post-IT response (Junker IIa), called a “nonresponder” subgroup.[10] However, despite the high probability of a LTS for complete response, overlapping with patients, who survive anyway, cannot be completely excluded. Up to 20% of patients are unable to undergo surgery, mainly due to IT-resistant progressive tumor and the improved outcome after IT may simply result from a selection process related to more or less aggressive tumor biology.[18]
In addition, patients who underwent IT and experienced the pathologic response afterward represent only one part of the initial cohort. Consequently, the contribution of pathologic response to IT into the clinical outcome remains undefined and is still challenging in the multimodal treatment strategy. From other point of view the favorable outcome in carefully selected patients with pathologic response following IT leads to continue the selection process in the interdisciplinary conference presenting it as strength and not as limitation[4] [19]
Our results confirm the favorable postoperative and PFSs in patients with MPR compared with the non-MPR patients, and are associated with statistical significance in whole, early, and long-term POSs, according to the log-rank, Breslow, and Tarone–Ware tests. Moreover, the MPR was present in the majority of our patients who underwent curative surgery and significantly associated with LTS. Therefore, based on our results, as well as in accordance with other studies, the use of MPR as a surrogate for better prognosis would lead to more practice and clinic-related approach within the multimodality therapy.[19] [20] Based on those findings, MPR could be routinely evaluated after IT and its therapeutic and diagnostic value could be comparable with pCR. This underlines the clinical relevance of MPR and allows further treatment stratification in the non-MPR patients with significantly higher risk of tumor recurrence. The role of molecular pathology in patients with pathologically relevant tumor activity after IT is a subject of further evaluation.[4] In our opinion, the MPR is a reliable histopathological landmark, associated with clinically relevant information and enables further pathology-based stratification of the adjuvant treatment. Consequently, due to inaccurate restaging in predicting the pathology response, the privilege of surgery within multimodality therapy seems to be accomplished by complete tumor resection, identification of suitable candidates with favorable prognosis, based on the accurately determined pathologic response, and allows further stratification of adjuvant treatment correlated to the tumor recurrence risk.[21] The accurate identification of the tumor response clearly highlights the potential therapeutic and diagnostic role of surgery in multimodality therapy setting in locally advanced NSCLC.
In summary, our results support the implementation of MPR as a surrogate for favorable survival and improved tumor control in locally advanced NSCLC after IT. The interdisciplinary debate on the potential role of surgery is needed to clarify the surgical impact on patient prognosis, accurate identification of the tumor response, and further treatment stratification according to different risk of tumor recurrence.
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Conflict of Interest
None.
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Reference
- 1 De Ruysscher D, Vansteenkiste J, Belderbos J, Decaluwé H, Dingemans AM. The optimal local treatment of stage IIIA-N2 NSCLC: is the issue finally settled?. J Thorac Oncol 2016; 11 (03) 284-286
- 2 van Meerbeeck JP. The controversial role of surgery in stage III NSCLC. Lancet Oncol 2008; 9 (07) 607-608
- 3 Mirimanoff RO. Neoadjuvant chemoradiotherapy followed by surgery for stage IIIa and IIIb non-small-cell lung cancer (NSCLC): is it still justified?. Linchuang Zhongliuxue Zazhi 2015; 4 (04) 49-57
- 4 Lococo F, Cesario A, Margaritora S. et al. Long-term results in patients with pathological complete response after induction radiochemotherapy followed by surgery for locally advanced non-small-cell lung cancer. Eur J Cardiothorac Surg 2013; 43 (03) e71-e81
- 5 Pataer A, Kalhor N, Correa AM. et al; University of Texas M. D. Anderson Lung Cancer Collaborative Research Group. Histopathologic response criteria predict survival of patients with resected lung cancer after neoadjuvant chemotherapy. J Thorac Oncol 2012; 7 (05) 825-832
- 6 Hellmann MD, Chaft JE, William Jr WN. et al; University of Texas MD Anderson Lung Cancer Collaborative Group. Pathological response after neoadjuvant chemotherapy in resectable non-small-cell lung cancers: proposal for the use of major pathological response as a surrogate endpoint. Lancet Oncol 2014; 15 (01) e42-e50
- 7 Cascone T, Gold KA, Swisher SG. et al. Induction cisplatin docetaxel followed by surgery and erlotinib in non-small cell lung cancer. Ann Thorac Surg 2018; 105 (02) 418-424
- 8 Eisenhauer EA, Therasse P, Bogaerts J. et al. New response evaluation criteria in solid tumours: revised RECIST guideline (version 1.1). Eur J Cancer 2009; 45 (02) 228-247
- 9 Junker K, Thomas M, Schulmann K, Klinke F, Bosse U, Müller KM. Tumour regression in non-small-cell lung cancer following neoadjuvant therapy. Histological assessment. J Cancer Res Clin Oncol 1997; 123 (09) 469-477
- 10 Junker K. Tumour regression in non-small-cell lung cancer following neoadjuvant therapy, a significant prognostic factor. J Cancer Res Clin Oncol 1998; 124: 283-284
- 11 Goldstraw P, Chansky K, Crowley J. et al; International Association for the Study of Lung Cancer Staging and Prognostic Factors Committee, Advisory Boards, and Participating Institutions, International Association for the Study of Lung Cancer Staging and Prognostic Factors Committee Advisory Boards and Participating Institutions. The IASLC Lung Cancer Staging Project: Proposals for Revision of the TNM Stage Groupings in the Forthcoming (Eighth) Edition of the TNM Classification for Lung Cancer. J Thorac Oncol 2016; 11 (01) 39-51
- 12 Blumenthal GM, Bunn Jr PA, Chaft JE. et al. Current status and future perspectives on neo-adjuvant therapy in lung cancer. J Thorac Oncol 2018; 13 (12) 1818-1831
- 13 Crabtree TD, Sharma A. Is there any role for positron emission tomography-computed tomography after induction therapy for locally advanced non-small cell lung cancer?. J Thorac Cardiovasc Surg 2016; 151 (04) 911-912
- 14 Kappers I, van Sandick JW, Burgers JA. et al. Results of combined modality treatment in patients with non-small-cell lung cancer of the superior sulcus and the rationale for surgical resection. Eur J Cardiothorac Surg 2009; 36 (04) 741-746
- 15 Nason KS. Is there a role for postinduction positron emission tomography and computed tomography with fludeoxyglucose F 18? A call for standardization. J Thorac Cardiovasc Surg 2016; 151 (04) 980-981
- 16 Schreiner W, Gavrychenkova S, Dudek W. et al. Pathologic complete response after induction therapy-the role of surgery in stage IIIA/B locally advanced non-small cell lung cancer. J Thorac Dis 2018; 10 (05) 2795-2803
- 17 Pöttgen C, Stuschke M, Graupner B. et al. Prognostic model for long-term survival of locally advanced non-small-cell lung cancer patients after neoadjuvant radiochemotherapy and resection integrating clinical and histopathologic factors. BMC Cancer 2015; 15: 363
- 18 Massard G, Kessler R, Wihlm JM. Improved selection of winners: a working hypothesis for neoadjuvant chemotherapy. Ann Thorac Surg 1998; 66 (01) 300-301
- 19 Cerfolio RJ, Maniscalco L, Bryant AS. The treatment of patients with stage IIIA non-small cell lung cancer from N2 disease: who returns to the surgical arena and who survives. Ann Thorac Surg 2008; 86 (03) 912-920 , discussion 912–920
- 20 Isobe K, Hata Y, Sakaguchi S. et al. Pathological response and prognosis of stage III non-small cell lung cancer patients treated with induction chemoradiation. Asia Pac J Clin Oncol 2012; 8 (03) 260-266
- 21 Schreiner W, Dudek W, Lettmaier S, Gavrychenkova S, Rieker R, Fietkau R, Sirbu H. Neoadjuvant radiochemotherapy followed by curative resection in patients with advanced non-small cell lung cancer in stage IIIA/IIIB: prognostic factors and results. Zentralbl Chir 2016; 141: 323-329
Address for correspondence
Publikationsverlauf
Eingereicht: 01. Oktober 2018
Angenommen: 14. Januar 2019
Artikel online veröffentlicht:
26. Februar 2019
© 2020. Thieme. All rights reserved.
Georg Thieme Verlag KG
Stuttgart · New York
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Reference
- 1 De Ruysscher D, Vansteenkiste J, Belderbos J, Decaluwé H, Dingemans AM. The optimal local treatment of stage IIIA-N2 NSCLC: is the issue finally settled?. J Thorac Oncol 2016; 11 (03) 284-286
- 2 van Meerbeeck JP. The controversial role of surgery in stage III NSCLC. Lancet Oncol 2008; 9 (07) 607-608
- 3 Mirimanoff RO. Neoadjuvant chemoradiotherapy followed by surgery for stage IIIa and IIIb non-small-cell lung cancer (NSCLC): is it still justified?. Linchuang Zhongliuxue Zazhi 2015; 4 (04) 49-57
- 4 Lococo F, Cesario A, Margaritora S. et al. Long-term results in patients with pathological complete response after induction radiochemotherapy followed by surgery for locally advanced non-small-cell lung cancer. Eur J Cardiothorac Surg 2013; 43 (03) e71-e81
- 5 Pataer A, Kalhor N, Correa AM. et al; University of Texas M. D. Anderson Lung Cancer Collaborative Research Group. Histopathologic response criteria predict survival of patients with resected lung cancer after neoadjuvant chemotherapy. J Thorac Oncol 2012; 7 (05) 825-832
- 6 Hellmann MD, Chaft JE, William Jr WN. et al; University of Texas MD Anderson Lung Cancer Collaborative Group. Pathological response after neoadjuvant chemotherapy in resectable non-small-cell lung cancers: proposal for the use of major pathological response as a surrogate endpoint. Lancet Oncol 2014; 15 (01) e42-e50
- 7 Cascone T, Gold KA, Swisher SG. et al. Induction cisplatin docetaxel followed by surgery and erlotinib in non-small cell lung cancer. Ann Thorac Surg 2018; 105 (02) 418-424
- 8 Eisenhauer EA, Therasse P, Bogaerts J. et al. New response evaluation criteria in solid tumours: revised RECIST guideline (version 1.1). Eur J Cancer 2009; 45 (02) 228-247
- 9 Junker K, Thomas M, Schulmann K, Klinke F, Bosse U, Müller KM. Tumour regression in non-small-cell lung cancer following neoadjuvant therapy. Histological assessment. J Cancer Res Clin Oncol 1997; 123 (09) 469-477
- 10 Junker K. Tumour regression in non-small-cell lung cancer following neoadjuvant therapy, a significant prognostic factor. J Cancer Res Clin Oncol 1998; 124: 283-284
- 11 Goldstraw P, Chansky K, Crowley J. et al; International Association for the Study of Lung Cancer Staging and Prognostic Factors Committee, Advisory Boards, and Participating Institutions, International Association for the Study of Lung Cancer Staging and Prognostic Factors Committee Advisory Boards and Participating Institutions. The IASLC Lung Cancer Staging Project: Proposals for Revision of the TNM Stage Groupings in the Forthcoming (Eighth) Edition of the TNM Classification for Lung Cancer. J Thorac Oncol 2016; 11 (01) 39-51
- 12 Blumenthal GM, Bunn Jr PA, Chaft JE. et al. Current status and future perspectives on neo-adjuvant therapy in lung cancer. J Thorac Oncol 2018; 13 (12) 1818-1831
- 13 Crabtree TD, Sharma A. Is there any role for positron emission tomography-computed tomography after induction therapy for locally advanced non-small cell lung cancer?. J Thorac Cardiovasc Surg 2016; 151 (04) 911-912
- 14 Kappers I, van Sandick JW, Burgers JA. et al. Results of combined modality treatment in patients with non-small-cell lung cancer of the superior sulcus and the rationale for surgical resection. Eur J Cardiothorac Surg 2009; 36 (04) 741-746
- 15 Nason KS. Is there a role for postinduction positron emission tomography and computed tomography with fludeoxyglucose F 18? A call for standardization. J Thorac Cardiovasc Surg 2016; 151 (04) 980-981
- 16 Schreiner W, Gavrychenkova S, Dudek W. et al. Pathologic complete response after induction therapy-the role of surgery in stage IIIA/B locally advanced non-small cell lung cancer. J Thorac Dis 2018; 10 (05) 2795-2803
- 17 Pöttgen C, Stuschke M, Graupner B. et al. Prognostic model for long-term survival of locally advanced non-small-cell lung cancer patients after neoadjuvant radiochemotherapy and resection integrating clinical and histopathologic factors. BMC Cancer 2015; 15: 363
- 18 Massard G, Kessler R, Wihlm JM. Improved selection of winners: a working hypothesis for neoadjuvant chemotherapy. Ann Thorac Surg 1998; 66 (01) 300-301
- 19 Cerfolio RJ, Maniscalco L, Bryant AS. The treatment of patients with stage IIIA non-small cell lung cancer from N2 disease: who returns to the surgical arena and who survives. Ann Thorac Surg 2008; 86 (03) 912-920 , discussion 912–920
- 20 Isobe K, Hata Y, Sakaguchi S. et al. Pathological response and prognosis of stage III non-small cell lung cancer patients treated with induction chemoradiation. Asia Pac J Clin Oncol 2012; 8 (03) 260-266
- 21 Schreiner W, Dudek W, Lettmaier S, Gavrychenkova S, Rieker R, Fietkau R, Sirbu H. Neoadjuvant radiochemotherapy followed by curative resection in patients with advanced non-small cell lung cancer in stage IIIA/IIIB: prognostic factors and results. Zentralbl Chir 2016; 141: 323-329
![](https://www.thieme-connect.de/media/thoracic/202007/thumbnails/10-1055-s-0039-1679884-i185355-1.jpg)
![Zoom Image](/products/assets/desktop/css/img/icon-figure-zoom.png)
![](https://www.thieme-connect.de/media/thoracic/202007/thumbnails/10-1055-s-0039-1679884-i185355-2.jpg)
![Zoom Image](/products/assets/desktop/css/img/icon-figure-zoom.png)