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Immunological effect of tyrosine kinase inhibitors on the tumor immune environment in non‑small cell lung cancer (Review)

  • Authors:
    • Li Jiang
    • Jiyan Liu
  • View Affiliations

  • Published online on: March 28, 2022     https://doi.org/10.3892/ol.2022.13285
  • Article Number: 165
  • Copyright: © Jiang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Acquired resistance to tyrosine kinase inhibitors (TKIs) limits the duration of antitumor effects and impairs the survival of patients with oncogene‑driven non‑small cell lung cancer (NSCLC). At present, little is known about the immunomodulatory ability of TKIs during the entire treatment period, including the drug‑sensitive and drug‑resistant periods. The present review aimed to comprehensively explore the dynamic changes in the tumor microenvironment (TME) during TKI treatment in NSCLC. Previous clinical and preclinical studies from medical and health databases related to NSCLC are reviewed. During the response period, cytotoxic immune cells accumulate in the TME and contribute to the formation of an inflammatory microenvironment. During the resistance period, the number of immunosuppressive cells increases, as does the expression of immune checkpoint proteins, which are critical mechanisms for tumor progression. The combination of targeted therapy and immunotherapy has been explored in multiple studies, and preliminary data showed controversial results. Extensive studies are needed to confirm the criteria of the selected patient subgroups and the toxicity profiles of EGFR TKIs and immune checkpoint inhibitors (ICIs). At present, the reagents targeting other immune cells, cytokines and related pathways remain underexplored compared with the revolutionary effect of ICIs in lung cancer. In the future, the precisely selected regimens for combination treatment should be further investigated in carefully designed xenograft models and clinical trials.

Introduction

Lung cancer remains the leading cause of cancer-related death worldwide. During the last decade, the treatment paradigm for non-small cell lung cancer (NSCLC) has been significantly changed by targeted tyrosine kinase inhibitors (TKIs) based on molecular features (1). However, the limited response prevents patients from receiving the benefits of the targeted therapy. For example, in the case of EGFR, most patients gain resistance to gefitinib and erlotinib within a median period of 14 months (2). Overcoming the dilemma of recurrent resistance to TKIs is challenging. PD-1/PD-L1 inhibitors are gaining attention for the treatment of NSCLC. Published clinical data have shown that immune checkpoint inhibitors (ICIs) exhibit little antitumor efficacy in NSCLC with oncogene mutations (3,4). Accumulating evidence has demonstrated that the response rate of ICI is closely associated with the immune microenvironment (5). Changes in the tumor immune microenvironment during TKI treatment remain unclear. Therefore, a better understanding of the tumor microenvironment (TME) during targeted treatment is required to provide clues for functional treatment strategies (6,7).

The present review summarizes the last 10 years of research into the immune alterations occurring before and after resistance to targeted therapy in NSCLC. Furthermore, the present review summarizes how different components of the TME contribute to TKI resistance as well as to the disease relapse and discusses combination strategies to achieve long-lasting responses in patients with NSCLC.

Short-term effects on the TME

EGFR inhibitors

Numerous immune cells coexist in the TME, including T and B lymphocytes, macrophages, polymorphonuclear cells, mast cells, natural killer cells, dendritic cells and myeloid-derived suppressor cells (MDSCs). These cell clusters can infiltrate into the TME and alter it after targeted therapy (6).

During the response period to TKIs, CD8+ T cells and dendritic cells expand, while immunosuppressive cells such as Foxp3+ regulatory T cells (Tregs) and M2-like polarization of macrophages are inhibited. T-cell infiltration in the TME is elevated by TKIs (8). Increased lymphocyte infiltration generates a local inflammatory TME. For example, skin rash is a common side effect of EGFR-TKIs. EGFR-TKIs have been reported to alter the levels of circulating cytokines and lymphocytes (9). A significant increase in peripheral natural killer cells and interferon-γ (IFN-γ) levels is observed after 4 weeks of gefitinib treatment. In addition, erlotinib and gefitinib improve the susceptibility of cancer cells to natural killer cells (10). EGFR inhibitors induce the expression of major histocombatibility complex (MHC) class I and II molecules and promote T cell-mediated tumor death (11). Circulating interleukin 6 (IL-6) levels are significantly decreased, which might predict better progression-free survival (7). EGFR TKIs decrease pro-inflammatory cytokines such as CC chemokine ligand (CCL)2, CCL5, C-X-C motif chemokine ligand (CXCL)8, CXCL10, and IFN-γ-induced protein 10, and increase the level of IFN-γ (9,12).

In mouse models with sensitive EGFR mutations, erlotinib increases the infiltration of T lymphocytes and natural killer cells other than B cells. Dendritic cells and macrophages with increased MHC class II expression may enhance antigen-presenting activity. The levels of immune checkpoints in the TME were reduced (13). Several EGFR downstream signaling pathways [IL-6/Janus kinase (JAK)/STAT3, NF-κB, and phospho-ERK1/2/phospho-c-Jun] regulate PD-L1 expression in tumor cells (3,7). An NSCLC specimen study illustrated that PD-L1 expression was downregulated after 4 weeks of gefitinib treatment (14). EGFR TKI treatment led to a decrease in PD-1, cytotoxic T lymphocyte-associated antigen 4 and T cell immunoglobulin and mucin domain-containing protein 3 expression in T cells in mouse models (8). EGFR TKIs and anti-PD-1 antibody combination treatment produced no synergistic antitumor effect in an in vitro co-culture system (3). Reduced expression of immune checkpoints within the TME may explain these clinical observations (15).

ALK inhibitors

ALK inhibitors have been reported to increase T-lymphocyte infiltration. Recently, whole-exome and RNA sequencing indicated that immune-related genes were altered in response to ALK TKI treatment. Antigen presentation genes, IFN-γ signaling genes, inhibitory checkpoint genes, and stimulatory checkpoint genes increased apparently after response to ALK TKIs (Table I) (16).

Table I.

Alterations in tumor microenvironment before and after tyrosine kinase inhibitor resistance.

Table I.

Alterations in tumor microenvironment before and after tyrosine kinase inhibitor resistance.

Function categoryImmune componentiEGFR sensitiveiEGFR resistanceiALK resistance
Immune cellsCD8 + T cellsIncrease (8,16,25)Stable (16)Increase (16),
Decrease (31)Decrease (39)
NK cellsIncrease (7,8,14,16)Stable (16)Increase (16)
B cellsIncrease (16)NANA
MDSCsNAIncrease (8)NA
Dendritic cellsIncrease (8)NANA
M2-macrophageDecrease (8,25)Increase (25)Increase (39)
Regulatory T cellsDecrease (8)NAIncrease (39)
Antigen presentation genesCALRNADecrease (16)Decrease (16)
CANXNADecrease (16)Decrease (16)
PDIA3NADecrease (16)Decrease (16)
MHC-IIncrease (11)Decrease (23)NA
MHC-IIIncrease (11)NANA
Immune checkpointsSTAT5BNAIncrease (16)Increase (16)
PD-1NAIncrease (16)Increase (16)
BTLANAIncrease (16)Increase (16)
CD27NAIncrease (16)Increase (16)
PD-L1Decrease (3,36)Increase (29,31,36)Increase (39)
Inflammatory cytokinesIL-4NANAIncrease (39)
IL-6Decrease (7,14)NANA
IL-10Increase (8)NANA
CCL-2Increase (8)NANA
CCL-5Increase (9,12)NANA
CXCL8Increase (9)NANA
CXCL10Increase (9)NANA
IFN-γIncrease (7,39)Increase (16)Increase (16)
Mutational load Decrease (6)Increase (6,31)Decrease (16)

[i] iEGFR, EGFR inhibitors; iALK, ALK inhibitors; MDSCs, myeloid-derived suppressor cells; CCL, CC chemokine ligand; CXCL, C-X-C motif chemokine ligand; MHC, major histocompatibility complex; PD-L1, programmed death-ligand 1; PD-1, programmed cell death protein-1; BTLA, B- and T-lymphocyte attenuator; CALR, calreticulin; CANX, calnexin; PDIA3, protein disulfide isomerase A3; NA, not applicable; NK cells, natural killer cells; IL, interleukin; IFN, interferon.

In conclusion, short-term exposure to TKIs not only eliminates tumor cells, but also modulates immune-mediated cytotoxicity in the TME during the initial response period. One study provided a rationale for the potential combination of erlotinib and immunotherapies for the treatment of lung carcinomas in first-line treatment (17). However, other pre-clinical studies confirmed that synergistic effects of EGFR-TKIs combined with anti-PD-1 antibody were not present in an in vitro co-culture system (3). According to the latest edition of the National Comprehensive Cancer Network guidelines for NSCLC (18), PD-1/PD-L1 inhibitor may not be recommended for EGFR+/ALK+ NSCLC due to the negative results generated in a retrospective study (19). Therefore, TKI monotherapy is preferred for oncogene-driven NSCLC in the first-line treatment.

Long-term effects on the TME

After the long-term use of TKIs, the positive therapeutic response is reversed, especially when resistance emerges. Under the selective pressure of targeted therapy, certain tumor cells evade the host immunity through a variety of intrinsic mechanisms. Multiple signaling pathways and related molecules comprise the complexity of the TME. In summary, a wide range of immunosuppressive mechanisms may evolve the acquired resistance to TKIs (20,21).

EGFR inhibitors

A decrease in cytotoxic T cell populations was observed in EGFR inhibitor-resistant lung adenocarcinoma when compared with that in the initial biopsy from an identical patient (22). Some resistant tumors are deficient for MHC class I as a result of decreased mRNA levels and related genes (23). Thus, targeted treatment may influence different aspects of tumor antigen presentation and T-cell effector function. Mitogen-activated protein kinase is the most common compensatory signaling pathway responsible for the development of acquired resistance (24). In the examination of tumor biopsies, cytotoxic T cells are found to decrease after TKI resistance and T-cell infiltration. Tregs are the main component of the TME. Conversely, the number of macrophages, especially those expressing indoleamine 2,3-dioxygenase 1 (IDO1), increase with disease progression (25).

MDSCs are immature myeloid cells that mainly inhibit T-cell activation; they help create a favorable environment for tumor survival. In an in vivo study an increased percentage of MDSCs was detected during long-term use of EGFR-TKI in mouse models (8,26). Recruitment and expansion of MDSCs were detected in the serum of patients with NSCLC who achieved EGFR TKI resistance, compared with the baseline (27). In the TME, MDSCs impair host antitumor immunity and the effect of immunotherapy (28).

PD-L1 expression levels in tumor cells were found to notably increase after gefitinib treatment in a subset of patients (29). PD-L1 is a well-known immune checkpoint gene, and knockout of PD-L1 helps to restore the function of human cytotoxic T lymphocytes (30,31). The histological transformation of the tumor and metastasis sites affects the PD-L1 expression levels after resistance (32). In one study, paired analysis indicated that tumors with TPS ≥50% increased from 14 to 28% after acquired resistance, especially obvious in the EGFR T790M-negative tumor (31). High expression levels of PD-L1 have been reported to be a negative prognostic marker (33) and although lung cancer cells develop resistance to EGFR TKIs, EGFR phosphorylation is still suppressed in the resistant cells. However, the downstream ERK signaling is reactivated upon drug resistance, leading to PD-L1 restoration (34,35). Several studies have revealed that PD-L1 is a downstream target of the EGFR pathway, which is interceded via the IL-6/JAK/STAT3, NF-κB, and phospho-ERK1/2/phospho-c-Jun pathways (3,3638). Single-cell RNA sequencing of biopsy samples showed that immunosuppressive genes, such as IDO1, kynureninase and quinolinate phosphoribosyltransferase levels were elevated in TKI-resistant tumors compared with those in naïve tumors (25). Dynamic changes are shown in Figure 1.

ALK inhibitors

Limited data have been reported on the impact of ALK inhibitors on the TME after resistance in ALK-positive NSCLC. A preclinical study explored the changes in the tumor immune microenvironment in mouse models. The results indicated that ALK-positive NSCLC was as an immune ‘desert’ before the initiation of targeted therapy (39). After resistance to ceritinib the immunogenic features of TME changed, including increased PD-L1 expression levels, increased number of functionally impaired CD8+ T cells, antigen-presenting cells, Tregs and MDSCs, and increased IFN-γ secretion. RNA sequencing analysis revealed increased transcription of IFN-γ-related genes, Treg-related genes and immune suppressive macrophage-related genes. However, whole-exome sequencing revealed no obvious difference in tumor mutation burden and T cell receptor clonality between untreated and resistant ALK-positive tumors (39). Thus, due to the lack of immunogenicity and impaired antitumor immunity, ICIs are expected to be less effective in ALK-TKI-resistant tumors.

In conclusion, along with the emergence of acquired resistance, the TME begins to gain immunosuppressive features, such as the presence of inhibitory ligands, restoration of the MDSCs and Tregs, impaired functions of tumor-infiltrating lymphocytes, decreased antigen presentation, increased level of IFN-γ and increased immune checkpoint molecules (Table I) (8). Subsequently, immune evasion and T-cell exhaustion lead to disease progression (40). The potential mechanisms that are involved in these changes include: i) The reactivation of EGFR downstream signaling pathways; ii) the secretion of tumor-related exosomes by EGFR-mutated cells; and iii) the induction of MHC expression. The change in the TME indicates the possibility of initiating combination strategies in resistant patients.

Combination treatment strategies

At present, ICIs have achieved great success in the treatment area of lung cancer and are considered ideal for combination treatment. According to preclinical data, combination of EGFR-TKIs with ICIs showed promising antitumor effect in a mouse model (4143). Two retrospective studies suggested that nivolumab had a favorable response rate in NSCLC, especially in EGFR T790M-negative disease (44).

In first-line treatment, a phase Ib study investigated the safety and efficacy of durvalumab in combination with gefitinib. However, this study was halted due to liver dysfunction. The objective response rate was 77.8% (45). The KEYNOTE-021 study evaluated the safety of the combination of erlotinib or gefitinib and pembrolizumab. Compared with erlotinib, pembrolizumab plus gefitinib increased the incidence of toxicity and resulted in treatment discontinuation. The overall objective response rate was 41.7% (46).

In second-line treatment, the response rate of combination therapy between nivolumab and erlotinib was 15% and the response lasted as long as 38.2 months. A total of 20% of the participants experienced grade three toxicities (47). Long-term analysis of a phase Ib study of erlotinib plus atezolizumab showed tolerable adverse effects of combination therapy, with a median overall survival time of 32.7 months (48). In the TATTON trial, the objective response rate was 42% in the osimertinib and durvalumab group. The most common adverse events were arm rash, vomiting and diarrhea (49). Another phase III trial, CAURAL, reported that 64% (9/14) of participants responded to osimertinib and durvalumab. The main toxicity presented as a rash (50). Unfortunately, the TATTON and CAURAL trials were terminated by AstraZeneca owing to the increased incidence of interstitial lung disease (51). Related data were collected from the FAERS database, where 70 patients with NSCLC were treated with EGFR-TKI plus nivolumab, and the incidence of interstitial pneumonitis was 25.7% (52).

Due to the lack of immunogenicity, preclinical and clinical data have indicated that PD-1/PD-L1 inhibitors combined with ALK inhibitors are not superior to ALK inhibitors alone, and the incidence of drug-related hepatotoxicity has increased (39,53). However, carefully selected drugs for combination therapy, such as avelumab plus lorlatinib, could produce antitumor activity with an acceptable safety profile (54).

Recent studies have shown that the response rate to PD-1/PD-L1 inhibitors is closely associated with PD-L1 expression levels, tumor-infiltrating lymphocytes, gut microbiota, and the levels of IFN-γ, TGF-β, VEGF-A, IL-6, IL-10 and other biomarkers (8,55). In TKI-resistant patients with favorable immune features, there should be more confidence in attempting combined therapy with ICIs and TKIs.

Researchers seek to discover novel combination treatments. An in vitro study found that inhibition of EGFR signaling and IL-8 signaling triggered tumor apoptosis in resistant lung cancer (17). Blockade of TGF-β signaling combined with EGFR TKIs decreased the motility of resistant tumor cells in the cell culture system (56). Erlotinib plus bevacizumab produced a synergy effect in the EGFR-TKI-resistant xenograft model (57). These studies provide different treatment strategies to overcome the acquired resistance to TKIs in NSCLC.

Conclusion and future perspectives

It is known that the host immunity undergoes dynamic changes following TKI treatment. During the response period, cytotoxic immune cells accumulate in the TME and contribute to the formation of an inflammatory TME. Once the acquired resistance develops, immunosuppressive cells as well as immune checkpoints begin to increase and function in the TME, which is a critical mechanism for tumor progression. Although the response rate of ICIs shows negative results in advanced oncogene-driven NSCLC at frontline treatment, the combination of targeted therapy and immunotherapy remains a feasible strategy to achieve synergistic effects in selected resistant patients. Combination treatment has been explored in multiple studies, and preliminary data have shown both positive and negative results. Thus, extensive exploration is still needed to confirm the selection criteria of patient subgroups and the toxicity profiles of EGFR-TKIs plus ICIs. At present, reagents targeting MDSCs, Tregs, IL-8, TGF-β and related pathways remain underexplored as compared with the revolutionary effect of ICIs in lung cancer. In the future, the precisely selected regimens for combination therapy should be further investigated in carefully designed xenograft models and clinical trials.

Acknowledgements

Not applicable.

Funding

Funding: No funding was received.

Availability of data and materials

Not applicable.

Authors' contributions

LJ performed the literature search and drafted the manuscript. JYL conceived the review and revised the manuscript. Both authors have read and approved the manuscript. Data sharing is not applicable.

Ethics approval and consent to participate

Not applicable.

Patient consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

Glossary

Abbreviations

Abbreviations:

NSCLC

non-small cell lung cancer

TKIs

tyrosine kinase inhibitors

MDSCs

myeloid-derived suppressor cells

TME

tumor microenvironment

Tregs

regulatory T cells

ICIs

immune checkpoint inhibitors

IDO1

indoleamine 2,3-dioxygenase 1

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May-2022
Volume 23 Issue 5

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Spandidos Publications style
Jiang L and Liu J: Immunological effect of tyrosine kinase inhibitors on the tumor immune environment in non‑small cell lung cancer (Review). Oncol Lett 23: 165, 2022.
APA
Jiang, L., & Liu, J. (2022). Immunological effect of tyrosine kinase inhibitors on the tumor immune environment in non‑small cell lung cancer (Review). Oncology Letters, 23, 165. https://doi.org/10.3892/ol.2022.13285
MLA
Jiang, L., Liu, J."Immunological effect of tyrosine kinase inhibitors on the tumor immune environment in non‑small cell lung cancer (Review)". Oncology Letters 23.5 (2022): 165.
Chicago
Jiang, L., Liu, J."Immunological effect of tyrosine kinase inhibitors on the tumor immune environment in non‑small cell lung cancer (Review)". Oncology Letters 23, no. 5 (2022): 165. https://doi.org/10.3892/ol.2022.13285