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Kardiochirurgia i Torakochirurgia Polska/Polish Journal of Thoracic and Cardiovascular Surgery
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Review paper

Current views on molecularly targeted therapy for lung cancer – a review of literature from the last five years

Agnieszka Rybarczyk-Kasiuchnicz
,
Rodryg Ramlau

Kardiochirurgia i Torakochirurgia Polska 2018; 15 (2): 119-124
Online publish date: 2018/06/22
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Introduction

Lung cancer is one the most common types of malignant neoplasms in Poland. It is also the main cancer-related cause of death in this country. In total, over 22,000 new cases of lung cancer are recorded each year. According to the Polish National Cancer Registry, the rate of 5-year survival among lung cancer patients for the year 2016 was 13% [1]. The most significant prognostic factor in the course of this disease is its advancement. In patients after radical surgery, the median duration of overall survival (OS) is 14–60 months; for advanced stages, this time ranges from several months to over a year. For the past few years, the incidence of adenocarcinoma has been observed to gradually increase, while the incidence of squamous cell carcinoma has shown a falling tendency. The use of two-drug regimens based on platinum derivatives and new-generation agents offers a chance to achieve an OS of 10 to 12 months. Conventional chemotherapy regimens fail to achieve significant prolongation of patient survival. The treatment’s toxicity, rising with its duration, not only worsens the patients’ quality of life, but also limits therapeutic options. To help these patients, researchers have begun to develop new treatment strategies based on molecular biology [2].

Activating mutations in the EGFR gene – first-generation tyrosine kinase inhibitors

Starting in the year 2000, patients with lung cancer in the Massachusetts General Hospital received gefitinib in monotherapy after being previously treated with chemotherapy. The average time of survival during the gefitinib treatment exceeded 18 months, and the treatment lasted 16 months on average. The study showed that most of the patients who responded to gefitinib treatment were non-smoking women diagnosed with bronchoalveolar cancer. A hypothesis was put forward that patients with non-small-cell lung carcinoma (NSCLC) responding to gefitinib have a somatic mutation in the EGFR gene, which provides them with sensitivity to the employed agent. After the gene’s entire coding region was sequenced using the polymerase chain reaction (PCR) method in patients responding to gefitinib, mutations were found in exons 18, 19, and 21. Based on these results, FDA approved gefitinib (a low-molecular-weight inhibitor of epidermal growth factor receptor’s tyrosine kinase domain) for the treatment of lung cancer. This is the first medication for this disease with an identified molecular target. Pharmacological studies have enabled the establishment of the recommended daily dose at 250 mg.

EGFR tyrosine kinase inhibitors as a first-line treatment for patients with activating mutations in the EGFR gene

Eight phase III clinical trials analyzing patients with advanced NSCLC demonstrated advantages of gefitinib, erlotinib, and afatinib over two-drug chemotherapy based on platinum derivatives and new-generation cytostatics. In the IPASS study, gefitinib was compared with carboplatin and paclitaxel, in the West-Japan study – with cisplatin and docetaxel, in the North-East-Japan study – with carboplatin and paclitaxel, and in the First-SIGNAL study – with cisplatin and gemcitabine. In the OPTIMAL and EURTAC trials erlotinib was compared with two-drug chemotherapy regimens (respectively: gemcitabine with carboplatin and a two-drug regimen based on platinum derivatives). In turn, the LUX-Lung 3 study compared afatinib with a combination of cisplatin and pemetrexed [3], while the LUX-Lung 6 study compared it with a combination of cisplatin and gemcitabine [4]. All these studies showed advantages of tyrosine kinase inhibitors (TKIs) over two-drug chemotherapy based on platinum derivatives and new-generation agents. The patients receiving TKIs achieved longer progression-free survival (PFS) and had higher objective response rates (ORR) and disease control rates (DCR) in comparison to patients treated with chemotherapy. First-generation TKIs block the EGFR receptor in a reversible fashion. Afatinib binds to the receptor irreversibly and has higher receptor affinity [5]. The LUX-Lung 7 trial compared gefitinib with afatinib in patients with metastases to the central nervous system (CNS). The average time of follow-up was 27.3 months; progression-free survival amounted to 11 months in the afatinib group and 10.9 months in the gefitinib group. The average time to treatment failure was 13.7 months for afatinib and 11.5 months for gefitinib. The trial showed no differences between the agents in terms of overall survival [6].
Dacomitinib, an irreversible second-generation panHER TKI was compared with first-generation TKIs in clinical studies ARCHER 1009 and ARCHER 1028, which analyzed patients who had been previously treated. The patients receiving dacomitinib had longer progression-free survival, but the treatment’s toxicity was higher. In the ongoing ARCHER 1050 study, dacomitinib is being compared with gefitinib as a first-line treatment for patients with advanced lung cancer [7].

T790M mutation

Treated with gefitinib, erlotinib, or afatinib, NSCLC patients with activating mutations in the EGFR gene exhibit secondary resistance to these agents after an initial period of treatment response. Other patients fail to respond to gefitinib or erlotinib from the outset. The factor underlying this situation is the T790M mutation in exon 20 of the EGFR gene. The mutation conditions 50–60% of resistance to first- and second-generation TKIs [8].
Osimertinib, a third-generation TKI, was compared in the clinical study AURA 3 to two-drug chemotherapy based on pemetrexed and cisplatin or carboplatin. This was the second line of treatment for all patients; the first line included first- and second-generation EGFR TKIs. After disease progression, the T790M mutation was assessed, and the patients were randomized into two groups, receiving either osimertinib or chemotherapy. The study included patients with metastases to the central nervous system who had no symptoms resulting from focal CNS lesions and required no steroid treatment for at least 4 weeks before the start of the study. The average treatment duration was 10.1 months for patients receiving osimertinib (n = 279) and 4.4 months for patients receiving chemotherapy (n = 140). The objective response rate (ORR) amounted to 71% for osimertinib and 31% for chemotherapy. Progression-free survival was prolonged in patients receiving osimertinib (as compared to chemotherapy) regardless of the presence of CNS metastasis [9–11].
Osimertinib, a low-molecular-weight third-generation TKI is recommended in patients with the T790M resistance mutation. It is also effective in patients with metastases to the central nervous system and meninges [12–14].
In FLAURA, a phase III clinical study, patients receiving osimertinib achieved PFS of 18.9 months, as compared to 10.2 months achieved in the control group (gefitinib or erlotinib). Patients with CNS metastases also benefited from the osimertinib treatment.
Another phase III study, ADAURA, is currently under way, examining patients with resectable lung cancer (stages IB-IIIA) and the T790M mutation. The patients receive osimertinib as an adjuvant treatment, and the controls are under active follow-up [15].

Mechanisms of resistance to osimertinib

Two mutations responsible for disease progression during osimertinib therapy have been found: G724S [16] and C797S in exon 20 [17]. The mutations condition osimertinib resistance. Brigatinib has been demonstrated to be effective in breaking resistance caused by the C797S mutation [18].

Activating rearrangement in the ALK gene

Fusion between the EML4 and ALK genes results in the formation of the fusion gene EML4/ALK, which is found in approximately 3–7% of patients with lung adenocarcinoma. It activates the intracellular transmission pathway, stimulates neoplastic proliferation, and inhibits apoptosis. An activating mutation in the ROS1 gene is found in approximately 1% of lung adenocarcinoma cases [19]. These mutations occur most often in young patients who either do not smoke tobacco or have a short history of smoking. The presence of these activating mutations is the therapeutic target for the low-molecular-weight selective inhibitor of the ALK and ROS1 tyrosine kinase receptors – crizotinib.
A phase III study, PROFILE 1014, compared crizotinib with two-drug chemotherapy (cisplatin and pemetrexed as the first line of treatment). The patients were positive for the ALK/EML4 fusion gene and had diffuse disease. The study achieved PFS of 10.9 months in patients treated with crizotinib and 7 months in patients receiving chemotherapy [20]. In lung adenocarcinoma patients with the ALK rearrangement (the EML4/ALK fusion gene) detected by molecular investigation, crizotinib is recommended as the first line of treatment. Another phase III study, PROFILE 1007, compared crizotinib with one-drug chemotherapy (pemetrexed or docetaxel) administered as a second-line treatment. Progression free survival was 7.7 months in the crizotinib group, as compared with 3 months in the chemotherapy group. Benefits from the crizotinib treatment (in comparison to chemotherapy) also included improved quality of life during the treatment and better symptom control [21]. Lung cancer patients with the ALK gene rearrangement who received chemotherapy as the first line of treatment should be qualified for second-line crizotinib treatment. To a small degree, crizotinib penetrates into the central nervous system. Disease progression in the CNS occurs in approximately half of the patients treated with crizotinib [22].
Ceritinib, a second-generation TKI, works in lung cancer patients with tumors exhibiting ALK gene rearrangement. The multicenter ASCEND-1 study demonstrated its effectiveness in patients previously treated with crizotinib. Progression-free survival lasted 6.9 months, and the ORR amounted to 56%. Patients with CNS metastases also benefited from the treatment [23]. In the crossover ASCEND-5 study, ceritinib was administered to lung cancer patients with ALK rearrangement in the tumor cells (stages IIIB–V) after previous chemotherapy, crizotinib treatment, and disease progression. The patients received ceritinib or chemotherapy (pemetrexed or docetaxel). The follow-up was 16.5 months; PFS lasted 5.4 months in patients receiving ceritinib and 1.6 months in patients undergoing chemotherapy. Patients receiving ceritinib showed better tolerance to the treatment, experienced fewer adverse events, and adhered to treatment schedules [24]. Ceritinib is a low-molecular-weight TKI recommended in ALK-positive patients after failed crizotinib treatment or treatment intolerance.
Alectinib, a second-generation TKI, is also effective in the central nervous system in patients with ALK-positive lung tumors. The phase III study ALEX included previously untreated patients with advanced ALK-positive lung cancer. The patients received crizotinib or alectinib. The primary endpoint of the study was the duration of progression-free survival. The median duration of follow-up was 17.6 months in the crizotinib arm, as compared to 18.6 months in the alectinib arm. PFS was significantly longer in patients treated with alectinib and lasted 25.7 months, in comparison to 10.4 months in the crizotinib group. The study also demonstrated alectinib to be effective in patients with metastases to the central nervous system. Changes in the CNS occurred in 12% of the patients treated with alectinib (18 patients) and in 45% of patients treated with crizotinib (68 patients). Additionally, the alectinib treatment was associated with lower toxicity [25].

Immunotherapy in lung cancer

A new therapeutic option for advanced lung cancer consists in blocking the PD-1 receptor on T cells, B cells, or PD-L1 situated on the tumor cells. Immunotherapy restores the immune system’s ability to recognize and act against tumor cells, offering a chance to limit the disease’s progression. Monoclonal antibodies bind to the PD-1 receptor (pembrolizumab, nivolumab) or the PD-L1 (atezolizumab, durvalumab).
Clinical studies are being conducted on both squamous and non-squamous cell carcinoma.

Squamous lung cancer

Necitumumab is an IgG1 monoclonal antibody targeting EGFR.
In the clinical study SQUIRE, the addition of necitumumab to chemotherapy (cisplatin with gemcitabine) in the first line of treatment prolonged overall survival among patients with squamous cell lung carcinoma from 9.9 months in the group treated with chemotherapy alone to 11.5 months in the group receiving necitumumab. PFS of 1 year was achieved by 48% of the patients receiving necitumumab in comparison to 43% of the patients treated with chemotherapy alone [26]. Retrospective analysis showed that patients with squamous lung carcinoma and tumor EGFR expression benefited from the addition of necitumumab [27].
In the CheckMate 017 study, patients with squamous lung cancer, who had previously been treated, received nivolumab or docetaxel. Overall survival was longer among patients receiving nivolumab (mean OS = 9.2 months; 95% CI: 7.3–13.3 months) vs. docetaxel (mean OS = 6 months; 95% CI: 5.1–7.3 months) [28]. Nivolumab was better tolerated than docetaxel, the dosage was reduced less frequently, and the patients adhered to the treatment schedule; the therapy was discontinued in 3% of patients receiving nivolumab and 10% of patients receiving docetaxel [29]. Nivolumab is recommended in squamous lung cancer patients who were previously treated with chemotherapy based on platinum derivatives. Benefits from nivolumab treatment are obtained in patients with PD-L1 expression shown to exceed 1% by molecular examination of tumor tissues.

Non-squamous lung cancer

In the INSPIRE study, the addition of necitumumab to chemotherapy (cisplatin with pemetrexed) in non-squamous lung cancer patients did not improve OS or PFS [30].
Pembrolizumab is a monoclonal antibody targeting PD-1 (programmed cell death receptor 1). The phase III study KEYNOTE 010 demonstrated that, in non-squamous lung cancer patients, pembrolizumab employed in the second line of treatment can prolong overall survival in comparison to docetaxel. The authors reported that lung cancer patients in whom the tumor cells showed PD-1 expression of at least 50% benefited from the therapy [31]. In another phase III study, KEYNOTE 024, the first line of treatment included pembrolizumab or two-drug chemotherapy based on cisplatin. The average PFS was 10.3 months in the pembrolizumab group and 6.7 months in the chemotherapy group. Six-month OS was achieved by 80.2% of patients treated with pembrolizumab and 72.4% of patients receiving chemotherapy. The response rates were 44.8% for pembrolizumab and 27.8% for chemotherapy. The patients included in the study had PD-L1 expression on at least 50% of the tumor cells [32]. Based on this study, the FDA approved pembrolizumab as a first-line treatment for patients with non-squamous lung cancer, provided that PD-1 expression in the tumor cells is 50% or higher according to molecular examinations. This high tumor cell expression is observed in approximately 30% of patients with NSCLC [33].
In the CheckMate 057 study, non-squamous lung cancer patients received a second-line treatment in the form of nivolumab or chemotherapy (docetaxel alone). The average OS was 12.2 months for nivolumab and 9.4 months for docetaxel. Fewer serious adverse events (SAEs) were noted in the nivolumab group (10%) than in the docetaxel group (54%); there was no difference between the groups in terms of PFS [34].
In the CheckMate 026 phase III study, the first line of treatment for NSCLC patients included nivolumab or two-drug chemotherapy based on cisplatin. PD-1 expression in tumor cells was at least 5%. Progression free survival amounted to 4.2 months in the nivolumab group, as compared to 5.9 months in the chemotherapy group. The duration of OS was 14.4 months for nivolumab and 13.2 months for chemotherapy. Serious adverse events occurred in 18% of patients receiving nivolumab and in 51% of patients treated with chemotherapy [35].
Atezolizumab is a monoclonal antibody binding to the PD-L1 receptor. In the POPLAR phase II study, non-squamous lung cancer patients after progression despite chemotherapy based on platinum derivatives received either atezolizumab or docetaxel [36]. The greatest benefits from atezolizumab were obtained in patients with high PD-L1 expression in the tumor tissues. Overall survival amounted to 15.5 months in the antibody (atezolizumab) group and 11.1 months in the chemotherapy (docetaxel) group; PFS lasted, respectively, 9.7 and 3.9 months. Patients in whom molecular examinations of the tumor tissues did not demonstrate PD-L1 expression had similar OS regardless of the agent employed.
In the OAK phase III study, lung cancer patients who had been previously treated with chemotherapy received atezolizumab or docetaxel in monotherapy. The average OS was 13.8 months (11.8–15.7 months) in the atezolizumab group and 9.6 months (8.6–11.2 months) in the chemotherapy group [37].
PACIFIC, a randomized phase III trial, demonstrated that, in patients with locally advanced NSCLC (stage III) and progression after standard chemoradiotherapy, durvalumab prolonged PFS to 16.8 months (vs. 5.6 months in placebo controls). Grade 3 or 4 adverse events (including pneumonitis) occurred in 4.4% of patients receiving durvalumab and 3.8% of placebo controls [38].
Good results in terms of disease control achieved during molecularly targeted therapies encourage researchers to attempt combining chemotherapy with low-molecular-weight tyrosine kinase inhibitors. In the LUME Lung-1 study, docetaxel was combined with the tyrosine kinase inhibitor nintedanib in patients with advanced non-squamous lung cancer who had previously been treated. PFS amounted to 3.4 months in the nintedanib group and 2.7 months among patients who did not receive this agent [39, 40].

Conclusions

New strategies of lung cancer treatment, based on molecular diagnosis of the tumor, allow for adjusting the therapy to specific changes in neoplastic cells responding to the administered agents. This enables the achievement of good therapeutic effects, reduction of treatment toxicity, improved progression-free survival, and a chance for prolonging the lives of the patients. The new agents allow the patients to undergo sequential therapy. The occurrence of TKI resistance caused by mutation in the tumor cells does not eliminate the chance for further treatment. Molecular biology offers the opportunity to detect resistance mutations and use next-generation TKIs to break the resistance. Close cooperation between physicians of various specialties should enable quick detection of lung cancer and prompt diagnosis (including the indispensable molecular investigation), while the results of subsequent clinical studies should enable the introduction of new agents into medical practice.

Disclosure

Authors report no conflict of interest.

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Copyright: © 2018 Polish Society of Cardiothoracic Surgeons (Polskie Towarzystwo KardioTorakochirurgów) and the editors of the Polish Journal of Cardio-Thoracic Surgery (Kardiochirurgia i Torakochirurgia Polska). This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) License (http://creativecommons.org/licenses/by-nc-sa/4.0/), allowing third parties to copy and redistribute the material in any medium or format and to remix, transform, and build upon the material, provided the original work is properly cited and states its license.
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