Second-line treatment for advanced NSCLC without actionable mutations: is immunotherapy the ‘panacea’ for all patients?
© The Author(s). 2018
Received: 2 January 2018
Accepted: 22 January 2018
Published: 16 February 2018
The original article was published in BMC Medicine 2017 15:193
The therapeutic approach for the second-line treatment of patients with advanced non-small cell lung cancer (NSCLC) without actionable mutations has been revolutionized by the recent approval of new effective drugs with various mechanisms of action, including nintedanib, ramucirumab, nivolumab, pembrolizumab, atezolizumab, and afatinib. The recent network meta-analysis of Créquit et al. (BMC Medicine, 15:193, 2017) compared the effectiveness and tolerability of the second-line treatments for advanced NSCLC with wild-type or unknown status for EGFR. The authors found that immunotherapy might be more efficacious than the currently recommended treatments. However, their meta-analysis does not take into account the role of predictive biomarkers – this is indeed a crucial point in the decision-making process considering that only a fraction of advanced NSCLC patients might derive a long-term benefit from second-line immunotherapy. The identification of molecular biomarkers that can predict a response to immune checkpoints, angiogenesis, and EGFR inhibitors remains an important goal of clinical research in order to maximize the benefit of these agents and to aid clinicians in the decision-making process.
Please see related article: https://bmcmedicine.biomedcentral.com/articles/10.1186/s12916-017-0954-x
New approved drugs for the second-line treatment of patients with advanced NSCLC
Progression-free survival, months
Median overall survival, months
Reck et al. 
Docetaxel + nintedanib vs. docetaxel + placebo
4.7% vs. 3.6%
4.0 vs. 2.8
12.6 vs. 10.3
Garon et al. 
Docetaxel + ramucirumab vs. docetaxel + placebo
23% vs. 14%
4.5 vs. 3.0
10.5 vs. 9.1
Brahmer et al 
Nivolumab vs. docetaxel
20% vs. 9%
3.5 vs. 2.8
9.2 vs. 6.0
Borghaei et al. 
Nivolumab vs. docetaxel
19% vs. 12%
2.3 vs. 4.2
12.2 vs. 9.4
Herbst et al. 
Pembrolizumab 2 mg/kg vs. pembrolizumab 10 mg/kg vs. docetaxel
18% vs. 18% vs. 9%
3.9 vs. 4.0 vs. 4.0
10.4 vs. 12.7 vs. 8.5
Rittmeyer et al. 
Atezolizumab vs. docetaxel
14% vs. 13%
2.8 vs. 4.0
13.8 vs. 9.6
Soria et al. 
Afatinib vs. erlotinib
6% vs. 3%
2.6 vs. 1.9
7.9 vs. 6.8
Network meta-analysis of second-line treatments
In the network meta-analysis of Créquit et al. , the authors compared the effectiveness and tolerability of the second-line treatments for advanced NSCLC with wild-type or unknown status for EGFR. Nivolumab, pembrolizumab, atezolizumab, and pemetrexed plus erlotinib were shown to be significantly more effective in terms of overall survival than docetaxel, pemetrexed, erlotinib, or gefitinib, and together with erlotinib plus cabozantinib represented the five most effective treatments in terms of overall survival. Indeed, the ‘old’ four recommended treatments were ranked in the 30th position, with no difference in effectiveness between them being observed. The authors’ main conclusion was that immunotherapy is more efficacious than the current recommended treatments in the second-line treatment of patients with NSCLC without actionable mutations.
Nevertheless, a major limitation of this network meta-analysis was the inclusion of only a small number of trials designed in a population of patients selected for biomarkers. Therefore, the predictive role of biomarkers, which is indeed a crucial point in the decision-making process, was not considered. Currently, only a fraction of advanced NSCLC patients might derive a long-term benefit from second-line immunotherapy.
In patients with non-squamous histology, the CheckMate-057 study demonstrated a longer overall survival with nivolumab compared with single agent docetaxel (12.2 vs. 9.4 months, HR 0.73, P = 0.002), but patients with poorer prognostic factors and/or more aggressive disease combined with lower or no PD-L1 expression appeared to be at higher risk of death within the first 3 months on nivolumab versus docetaxel . Exploratory analyses suggested that higher levels of PD-L1 were associated with a greater magnitude of overall survival benefit with nivolumab . The role of PD-L1 as a predictive biomarker has also been demonstrated for pembrolizumab and atezolizumab, as confirmed by recent meta-analyses [7, 8, 13, 14]. However, there are a number of PD-L1 testing limitations that can confound its use as a predictive biomarker, including the heterogeneity and dynamics of PD-L1 expression, the varying performance of the various immunohistochemistry-based assays with different cutoffs, the absence of consensus regarding the relevance of geographic patterns of expression of PD-L1 or its expression on tumor or inflammatory cells within the tumor microenvironment and, finally, the availability of an adequate sample .
On the other hand, the LUME-Lung-1 study  showed that nintedanib (a triple angiokinase inhibitor) plus docetaxel significantly improved overall survival in pretreated patients with adenocarcinoma histology (12.6 vs. 10.3 months, HR 0.83, P = 0.0359), with a greater survival advantage in patients with early progression of disease or refractory to first-line therapy, or with a greater tumor burden, as well as a non-negligible number of ‘long-surviving’ patients (over 32 months).
Therefore, the identification of proper predictive biomarkers for immunotherapy, angiogenesis, or EGFR inhibitors remains a crucial point in the era of precision medicine, and would likely contribute to the optimization of patient or treatment selection; this should be pursued in future studies.
Future implications for clinical practice
PD-L1, notwithstanding all its limitations, is to date the only molecular factor able to guide the choice of a second-line therapy for patients with advanced non-squamous non-oncogene-addicted NSCLC. A number of additional factors are under investigation, including the tumor mutational burden, tumor-infiltrating lymphocytes, indoleamine 2,3-dioxygenase, DNA mismatch repair deficiency, and the expression of inflammatory genes. Moreover, by examining histological sections of tumor biopsies collected from patients prior to receiving immunotherapy, three basic immune profiles that correlate with response to anti-PD-L1/PD-1 therapy have been described, namely an immune-inflamed phenotype generally correlated with higher response rates to anti-PD-L1/PD-1 therapy, an immune-excluded phenotype associated with uncommon clinical responses, and an immune-desert phenotype rarely responsive to anti-PD-L1/PD-1 therapy . Finally, emerging data also suggests that a subset of patients even appears to experience a tumor flare under checkpoint inhibitors, which has been recognized as a novel aggressive pattern of disease termed hyper-progression . A hyper-progression can be observed in roughly 10% of immunotherapy-treated patients and specific genomic alterations, e.g., the presence of MDM2 family amplification or EGFR aberrations, seem to be associated with this clinical feature .
In conclusion, the network meta-analysis of Créquit et al.  showed that immunotherapy might be more efficacious than the current recommended treatments in the second-line therapy of NSCLC; nevertheless, immunotherapy cannot be considered the ‘panacea’ for all NSCLC patients.
Currently, both clinical and molecular criteria (to date by detection of PD-L1) should be considered in the definition of the best therapeutic approach of patients with pre-treated NSCLC without actionable mutations. In the future, genomic and immune profiles will help to identify patients eligible for immunotherapy.
The Medical Oncology Unit, Thoracic-Pulmonary Department of the Istituto Nazionale Tumori, “Fondazione G. Pascale” – IRCCS, Naples is partially supported by Associazione Italiana per la Ricerca sul Cancro (AIRC).
AM, the sole author of this article, read and approved the final manuscript.
Alessandro Morabito was born on September 1, 1967, in Naples, Italy. He received his M.D. degree in 1991 and specialty in Oncology in 1995 at the University Federico II of Naples. Dr Morabito has been the Director of the Medical Oncology Unit, Thoracic-Pulmonary Department of the Istituto Nazionale Tumori, “Fondazione G. Pascale” – IRCCS, Naples since 2010. His research fields of major interest during recent years are lung cancer, target based agents and immunotherapy. Dr. Morabito is an active member of the American Society of Clinical Oncology (ASCO). He has published more than 200 articles in international journals, with an impact factor > 1400 points, a citation index > 12,000, and an H index of 43 (Google Scholar).
The author has participated in speakers bureaus from Pfizer, AstraZeneca, Roche, Boehringer, Bristol Mayer Squibb, Merck Sharp, and Dohme.
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