Purpose
Third-generation epidermal growth factor receptor tyrosine kinase inhibitor (EGFR TKIs) improved outcomes in EGFR-mutant non-small cell lung cancer (NSCLC); however, the subsequent development of resistance emphasizes the necessity of overcoming this therapeutic limitation. MET amplification is one of the major resistance mechanism in EGFR-mutant NSCLC, bypassing EGFR inhibition by activating cell survival, proliferation, and metastasis. Combining MET- and EGFR-TKIs is thus emerging as a promising therapeutic strategy to overcome resistance to EGFR TKIs.
Materials and Methods
This study aimed to investigate the combination of the selective MET TKI vabametkib and a third-generation EGFR TKI lazertinib in MET-amplified EGFR TKI resistance models. Inhibition of downstream signaling and cell proliferation by vabametkib plus lazertinib were evaluated in osimertinib-resistance NSCLC cell lines (HCC827-AR) and patient-derived organoid (YUO-010) by western blot and Cell Titer-Glo assay.
Results
In vitro studies demonstrated that vabametkib plus lazertinib synergistically inhibited EGFR/MET phosphorylation, leading to markedly enhanced anti-proliferative effects through downstream PI3K/AKT and MAPK pathway blockade. To investigate the antitumor effects in in vivo, we employed two patient-derived xenograft (PDX) models (YHIM-1035(1) and YHIM-1053) harboring MET amplification, as characterized by whole-exome sequencing or droplet digital PCR (ddPCR). Consistent with the in vitro findings, treatment with vabametkib plus lazertinib produced pronounced suppression of tumor growth in both models through a synergistic mechanism.
Conclusion
These findings establish vabametkib plus lazertinib as a promising strategy for MET-amplified NSCLC, currently under evaluation in an ongoing phase II clinical trial (NCT05541822).
Purpose
To identify predictors of brain metastasis in patients with unresectable stage III non-small cell lung cancer (NSCLC) treated with definitive concurrent chemoradiotherapy (CCRT) followed by durvalumab consolidation.
Materials and Methods
We retrospectively analyzed 138 patients with unresectable stage III NSCLC treated with definitive CCRT followed by durvalumab from 2018 to 2024. The primary endpoint was brain metastasis incidence. Univariate and multivariate logistic regression analyses identified factors associated with brain metastasis development.
Results
With a median follow-up of 18.7 months (range, 1.2–73.3), brain metastasis occurred in 18 of 138 patients (13.0%). In multivariate analysis, non-responders to durvalumab (OR 4.86, 95% CI 1.69-13.96, p=0.003) and initial supraclavicular nodal (SCN) involvement (OR 2.89, 95% CI 0.99-8.48, p=0.05) were independent predictors of brain metastasis. Non-responders demonstrated accelerated central nervous system (CNS) progression, with 63.6% developing brain metastases within 6 months versus 28.6% in responders. PD-L1 ≥50% was associated with improved OS but not with brain metastasis incidence. All patients who developed brain metastases were EGFR/ALK wild-type.
Conclusion
Non-responders to durvalumab and supraclavicular nodal involvement were significant predictors of brain metastasis in NSCLC treated with CCRT followed by durvalumab. These findings support risk-adapted CNS surveillance strategies in high-risk patients.
Purpose
The aim of this study was to identify subgroups of patients with pathologic N2 (pN2) non-small cell lung cancer (NSCLC) who may benefit from postoperative radiotherapy (PORT). Particular attention was given to evaluating whether extranodal extension (ENE) influences the therapeutic efficacy of PORT.
Materials and Methods
A total of 231 patients with pN2 NSCLC who underwent surgical resection followed by adjuvant chemotherapy at a single institution were analyzed retrospectively. Propensity score matching was performed to compare treatment outcomes according to the receipt of PORT.
Results
Propensity score matching yielded 99 matched pairs of patients with no significant differences in clinical parameters. There were no significant differences in the overall survival (OS; p=0.11) and disease-free survival (DFS; p=0.29) between the PORT and no PORT groups. However, PORT significantly improved the locoregional recurrence (LRR)-free rate (p=0.011), whereas the distant metastasis-free rate was comparable between groups (p=0.64). In subgroup analyses, PORT was associated with improved OS in patients with 1–3 positive N2 lymph nodes (p=0.013) and with significantly improved DFS among patients without ENE (p=0.046) or lymphatic invasion (p=0.032).
Conclusion
Although PORT did not improve OS or DFS in the matched overall cohort, it significantly reduced LRR. Subgroup analyses suggested potential benefits in patients with limited nodal burden and in those without ENE or lymphatic invasion. These findings, however, should be interpreted cautiously given small subgroup sizes and inherent limitations of retrospective design.
Purpose
Molecular biomarker testing is essential for lung cancer management and precision medicine. This study evaluated biomarker testing practices for non-small cell lung cancer across pathology laboratories in South Korea.
Materials and Methods
A nationwide survey of 30 pathology laboratories assessed testing policies, biomarker adoption, testing platforms, next-generation sequencing (NGS) implementation, reporting practices, turnaround times (TATs), and perceived challenges.
Results
All institutions routinely performed biomarker testing; 20 (66.7%) employed reflex testing at least in part. Tissue was the primary specimen type, and cytology and liquid biopsy specimens were accepted by 90.0% and 46.7% of institutions, respectively. For non-squamous NSCLC, all institutions tested EGFR, ALK, ROS1, and PD-L1, with additional testing for BRAF (86.7%) and KRAS (80.0%); other actionable targets were rarely tested outside NGS. In squamous NSCLC, PD-L1 was routinely assessed, whereas other drivers were tested less frequently. All institutions performed tissue-based NGS using companion diagnostic (CDx) and/or non-CDx platforms, and liquid biopsy–based NGS was available in 46.7% of institutions. Median TATs were 2–3, 5, 9, 19, and 15 days for immunohistochemistry, polymerase chain reaction, fluorescence in situ hybridization, tissue-based NGS, and liquid biopsy–based NGS, respectively. Reported barriers included limited sample availability, workforce shortages, prolonged TATs, regulatory restrictions, and lack of standardization.
Conclusion
Biomarker testing is widely implemented in South Korea, with increasing integration of NGS. Despite alignment with international recommendations, systemic and policy reforms are needed to harmonize workflows, reduce variability, and optimize precision oncology.
Seoyoung Lee, Chaeyeon Kim, Chang Gon Kim, Min Hee Hong, Mina Han, Wonrak Son, Gamin Kim, Hyeong Jung Woo, Hyun Young Shin, Jungmin Lee, Minseok S Kim, Hye Ryun Kim
Received June 29, 2025 Accepted January 26, 2026 Published online January 27, 2026
Purpose
Circulating tumor cell (CTC) is a promising minimally invasive biomarker for EGFR-mutant non-small cell lung cancer (NSCLC). However, the rarity of CTCs and limitations in their isolation and molecular characterization hinder their clinical utility, particularly in predicting treatment outcomes. This study evaluates the potential of CTC molecular response to predict treatment efficacy and guide therapy in patients with EGFR-mutant NSCLC undergoing EGFR-tyrosine kinase inhibitors (TKI) therapy.
Materials and Methods
Seventy-seven patients with EGFR-mutant NSCLC treated with EGFR-TKIs were enrolled. CTCs were isolated using continuous centrifugal microfluidic technology (CCM-CTCD) and compared with ctDNA and tissue biopsy for EGFR mutation analysis. Patients were categorized as CTC molecular responders or non-responders based on a ≥ 44.4% reduction in CTC count from baseline. Progression-free survival (PFS) and tumor burden changes were evaluated.
Results
CTC responders had significantly longer PFS (46.3 vs. 13.6 months, p=0.007) and greater tumor burden reduction (-37.7% vs. -35.2%, p=0.218) compared to non-responders. The CCM-CTCD demonstrated concordance with the cobas test while exhibiting higher sensitivity for EGFR mutation detection among 46 patients who underwent both tests simultaneously. Mutational discordance among tissue, ctDNA, and CTCs highlighted tumor heterogeneity. CTC profiling complemented traditional methods for identifying genomic alterations and predicting early progression.
Conclusion
CTC analysis using CCM-CTCD shows potential as a biomarker for predicting treatment response and prognosis in EGFR-mutant NSCLC. Stratification by CTC molecular response may inform risk-adapted treatment; however, its clinical utility remains to be established. Prospective studies are warranted to validate these findings and determine the role of CTC-guided decision-making.
Purpose
Small cell lung cancer (SCLC) is an aggressive malignancy with poor outcomes. IMpower133 and CASPIAN established platinum–etoposide plus anti–PD-L1 antibody as standard first-line therapy for extensive-stage SCLC (ES-SCLC). Real-world data in Korean patients are scarce. We evaluated the effectiveness and safety of first-line chemo-immunotherapy in ES-SCLC and compared outcomes with pivotal trials.
Materials and Methods
We retrospectively reviewed patients diagnosed with ES-SCLC between 2018 and 2021. Overall survival (OS), progression-free survival (PFS), and time to next treatment (TTNT) were analyzed using Kaplan–Meier methods. Multivariate Cox regression identified prognostic factors. Objective response rate (ORR) was assessed by RECIST v1.1, and histological subtypes evaluated.
Results
Among 177 patients, median age was 66 years (range, 42–91), with 63.8% aged ≥65; most were male (92.7%) and ECOG 0–1 (91.5%). Smoking history was present in 80.8%. Baseline brain and liver metastases occurred in 27.7% and 26%. Median follow-up was 27.2 months (range, 3.9–43.2). ORR was 74.5% (95% CI, 67.1–81.1). Median OS, PFS, and TTNT were 12.4 (95% CI, 11.6–14.9), 5.3 (95% CI, 5.1–5.87), and 5.6 months (95% CI, 1.43–38.27). In 49 patients with brain metastases, ORR was 63.2%, with no difference in efficacy. Local therapy for brain metastases improved OS (HR 0.42; p=0.012), while PFS was not different. Treatment-related adverse events occurred in 90%, primarily grade ≥2 cytopenias; the most common immune-related event was grade 1 rash.
Conclusion
In this real-world Korean cohort, first-line chemo-immunotherapy achieved outcomes comparable to pivotal trials, supporting its role as standard care for ES-SCLC in clinical practice.
Purpose
Prognostic stratification is essential in non-small-cell lung cancer (NSCLC) to guide treatment decisions. While the TNM staging system has evolved to refine the M category based on metastatic burden, it does not account for differences in prognosis based on the specific organ affected. This study evaluates whether incorporating organ-specific metastasis improves prognostic discrimination in stage IV NSCLC.
Materials and Methods
We conducted a retrospective cohort study using data from the Korean Central Cancer Registry (2014–2018). Patients with stage IV NSCLC were classified according to the 9th edition TNM classification: M1b (single-organ, single metastasis), M1c1 (multiple metastases within a single organ), and M1c2 (multiple organ metastases). Survival outcomes were compared across groups using Kaplan-Meier analysis and Cox proportional hazards modeling.
Results
Among 3,165 patients, 56.5% had single-organ metastases, while 43.5% had multiple organ metastases. Median overall survival (OS) was longest in M1b (8.0 months), followed by M1c1 (6.0 months), and shortest in M1c2 (5.9 months) (p<0.001). However, survival varied by metastatic organ. Liver, adrenal, and uncommon-site metastases were associated with significantly worse OS, even among M1b patients. Some M1b and M1c1 patients with high-risk organ metastases had worse survival than M1c2 patients, challenging the TNM-defined prognostic hierarchy.
Conclusion
The current TNM M category does not fully capture the prognostic impact of metastatic organ involvement. Incorporating organ-specific metastases into staging and prognostic models could refine risk stratification and improve personalized treatment approaches for stage IV NSCLC.
Purpose
Low-dose chest computed tomography (LDCT) is recommended for surveillance 2–3 years after curative resection of non-small cell lung cancer (NSCLC); however, supporting clinical evidence is limited. This study compared LDCT with contrast-enhanced chest computed tomography (CECT) in terms of recurrence detection and overall survival (OS) in patients 2 years after curative resection of NSCLC.
Materials and Methods
Among patients who underwent curative resection for NSCLC between January 2011 and December 2017 and survived for 2 years without recurrence, 2,083 patients were included. Comparisons between the LDCT and CECT groups were performed in both the entire cohort and propensity score-matched cohort. The primary outcome was the difference in overall survival. Secondary outcomes included time-to-recurrence, recurrence-free survival, and post-recurrence survival in each group.
Results
In the propensity score-matched population, the 5-year OS (96.0% for LDCT, 98.0% for CECT, p=0.097) and recurrence-free survival (RFS) (95.4% for LDCT, 96.0% for CECT, p=0.761) did not differ. The OS and RFS did not differ in subgroup analyses stratified by pathologic stage and histologic type. In the competing risk analysis, the overall 5-year cumulative incidence of recurrence did not differ between the two groups (4.56% for LDCT, 3.93% for CECT, p=0.765). When stratified by pathologic stage and histologic type, there was no significant difference in the cumulative incidence of recurrence. The distribution of recurrence sites did not differ between groups.
Conclusion
Similar OS and RFS were observed in LDCT and CECT surveillance in patients who achieved a 2-year disease-free status after curative resection for NSCLC.
Purpose Our previous study showed that circulating tumor cell (CTC) count combined with gene mutation detection might help differentiate benign and malignant pulmonary nodules (PNs). Herein, we aimed to expand the study cohort and conduct further sequencing analysis.
Materials and Methods Patients with PNs were included, and CTCs were identified before operation. Low-coverage whole-genome sequencing (LC-WGS) and lung cancer-related targeted gene sequencing were performed on CTCs. The diagnostic efficacy was evaluated by receiver operating characteristic (ROC) curve. The differences in CTC counts among subgroups classified by demographic–clinical characteristics were analyzed. LC-WGS–based copy number variation (CNV) analysis and targeted gene mutation analysis were conducted.
Results A total of 172 patients were included. CTC count of 2.5 was identified by the ROC curves as the optimal diagnostic cutoff. The sensitivity and specificity of CTC count for differentiating benign and malignant PNs were 54.2% and 78.6%, respectively. The diagnostic sensitivity and specificity of combined CTC count, radiological nodule type, and any malignant imaging features were 84.7% and 71.4%, respectively. The CTC counts were significantly greater in patients with aggressive tumors, later stage, and spread through air spaces. CTCs from malignant cases had more CNVs than those from benign cases.
Conclusion CTC count can be used in identifying malignant PNs. The diagnostic efficacy can be improved if combined with computed tomography imaging characteristics. Further CNV analysis might help differential diagnosis. Greater CTC count might suggest more aggressive tumors. CTC detection can provide important information and guidance for subsequent management of PNs.
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Purpose
The association between immune-related adverse events (irAEs) and survival outcomes in non–small cell lung cancer (NSCLC) patients treated with programmed death-(ligand) 1 [PD-(L)1] inhibitors remains controversial, partly due to variations in dealing with immortal-time bias (ITB).
Materials and Methods
We retrospectively enrolled 425 advanced NSCLC patients who received anti–PD-(L)1 monotherapy between January 2016 and June 2021, stratifying them into irAE (n=127) and non-irAE (n=298) groups. The primary endpoint was to assess the impact of irAEs on progression-free survival (PFS) and overall survival (OS). Landmark (2-, 3-, 6-, and 9-month) and time-dependent Cox analyses were performed to eliminate ITB.
Results
With a median follow-up of 38.8 months, the occurrence of overall irAEs was significantly associated with superior PFS (11.2 vs. 3.4 months, p < 0.001) and OS (31.4 vs. 14.0 months, p < 0.001), which persisted in landmark and time-dependent Cox analyses. For the main organ-specific irAEs, skin, thyroid, and hepatic irAEs, respectively, showed significantly improved survival compared to the non-irAE group, whereas pneumonitis did not. Single-organ irAEs had the best outcomes compared with multi-organ or no irAE, which also held across subgroups of skin, thyroid, and hepatic irAEs. Moreover, severe grade irAEs and immunotherapy discontinuation had a detrimental effect on survival, systemic steroid therapy showed little effect, while immunotherapy resumption had tolerable safety and a trend of improved survival.
Conclusion
After adequately adjusting ITB, the occurrence of overall irAEs predicts for favorable efficacy of anti–PD-(L)1 monotherapy in NSCLC, with better outcomes observed in patients with skin, thyroid, or hepatic irAEs, particularly those with single-organ involvement.
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Purpose
This study aimed to compare the failure patterns before and after the introduction of immunotherapy and to determine the role of thoracic radiotherapy (TRT) in extensive-stage small-cell lung cancer (ES-SCLC) treatment.
Materials and Methods
We retrospectively reviewed 294 patients with ES-SCLC, of which 62.2% underwent chemotherapy alone, 13.3% underwent chemotherapy followed by consolidative TRT (TRT group), and 24.5% underwent chemotherapy with immune checkpoint inhibitor (ICI group). We performed propensity-score matching (PSM) to compare each treatment group.
Results
The median follow-up duration was 10.4 months. At the first relapse, in the cohort showing objective response, the proportion of cases showing intrathoracic progression was significantly lower in the TRT group (37.8%) than in the chemotherapy-alone (77.2%, p < 0.001) and the ICI (60.3%, p=0.03) groups. Furthermore, in the subgroup analysis, TRT showed benefits related to intrathoracic progression-free survival (PFS) in comparison with ICI in patients with less than two involved extrathoracic sites (p=0.008) or without liver metastasis (p=0.02) or pleural metastasis (p=0.005) at diagnosis. After PSM, the TRT group showed significantly better intrathoracic PFS than both chemotherapy-alone and ICI groups (p < 0.001 and p=0.04, respectively), but showed no significant benefit in terms of PFS and overall survival in comparison with the ICI group (p=0.17 and p=0.31, respectively).
Conclusion
In ES-SCLC, intrathoracic progression was the most dominant failure pattern after immunotherapy. In the era of chemoimmunotherapy, consolidative TRT can still be considered a useful treatment strategy for locoregional control.
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Purpose The mammalian target of rapamycin complex 1 (mTORC1) regulates cell growth and proliferation by growth factor coordination and amino acid availability. Leucyl-tRNA synthetase 1 (LARS1) senses the intracellular leucine concentration and mediates amino acid-induced activation of mTORC1. Thus, LARS1 inhibition could be useful in cancer treatment. However, the fact that mTORC1 can be stimulated by various growth factors and amino acids suggests that LARS1 inhibition alone has limitations in inhibiting cell growth and proliferation. We investigated the combined effects of BC-LI-0186, a LARS1 inhibitor, and trametinib, an MEK inhibitor, on non–small cell lung cancer (NSCLC).
Materials and Methods Protein expression and phosphorylation were observed by immunoblotting, and genes differentially expressed between BC-LI-0186–sensitive and –resistant cells were identified by RNA sequencing. The combined effect of the two drugs was inferred from the combination index values and a xenograft model.
Results LARS1 expression was positively correlated with mTORC1 in NSCLC cell lines. BC-LI-0186 treatment of A549 and H460 cells maintained in media supplemented with fetal bovine serum revealed paradoxical phosphorylation of S6 and activation of mitogen- activated protein kinase (MAPK) signaling. Compared with BC-LI-0186–sensitive cells, –resistant cells showed enrichment of the MAPK gene set. The combination of trametinib and BC-LI-0186 inhibited the phosphorylation of S6, MEK, and extracellular signal-regulated kinase and their synergistic effects were confirmed in a mouse xenograft model.
Conclusion The combination of BC-LI-0186 and trametinib inhibited the non-canonical mTORC1-activating function of LARS1. Our study demonstrated a new therapeutic approach for NSCLC without targetable driver mutations.
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Purpose Guidelines recommend that non–small cell lung cancer (NSCLC) patients with suspected hilar lymph node (LN) metastases should undergo invasive mediastinal LN staging prior to surgical treatment via endosonography. We evaluated the diagnostic performance of endosonography for detecting occult mediastinal metastases (OMM) and determined the factors associated with OMM in NSCLC patients with radiological N1.
Materials and Methods Patients with confirmed primary NSCLC with radiological N1 who underwent endosonography for nodal staging assessment from January 2013 to December 2019 were retrospectively analyzed.
Results The prevalence of OMM was found to be 83/279 (29.7%) and only 38.6% (32/83) were diagnosed via endosonography. However, five of them were confirmed as N3 by endosonography. The overall diagnostic sensitivity, negative predictive value, accuracy, and area under the curve of endosonography were 38.6%, 79.4%, 81.7%, and 0.69, respectively. In multivariable analysis, central tumor (adjusted odds ratio [aOR], 2.05; 95% confidence interval [CI], 1.15 to 3.68; p=0.016), solid tumor (aOR, 10.24; 95% CI, 1.32 to 79.49; p=0.026), and adenocarcinoma (aOR, 3.01; 95% CI, 1.63 to 5.55; p < 0.001) were related to OMM in radiological N1 NSCLC patients.
Conclusion Although the sensitivity of endosonography for detecting OMM was only 40%, the prevalence of OMM was not low (30%) and some cases even turned out to be N3 diseases. Clinicians should be aware that OMM may be more likely in patients with central, solid, and adenocarcinomatous tumor when performing nodal staging in radiological N1 NSCLC via endosonography.
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Purpose Mixed-lineage leukemia protein 4 (MLL4/KMT2D) is a histone methyltransferase, and its mutation has been reported to be associated with a poor prognosis in many cancers, including lung cancer. We investigated the function of MLL4 in lung carcinogenesis.
Materials and Methods RNA sequencing (RNA-seq) in A549 cells transfected with control siRNA or MLL4 siRNA was performed. Also, we used EdU incorporation assay, colony formation assays, growth curve analysis, transwell invasion assays, immunohistochemical staining, and in vivo bioluminescence assay to investigate the function of MLL4 in lung carcinogenesis.
Results We found that MLL4 expression was downregulated in non–small cell lung cancer (NSCLC) tissues compared to adjacent normal tissues and tended to decrease with disease stage progression. We analyzed the transcriptomes in control and MLL4- deficient cells using high-throughput RNA deep sequencing (RNA-seq) and identified a cohort of target genes, such as SOX2, ATF1, FOXP4, PIK3IP1, SIRT4, TENT5B, and LFNG, some of which are related to proliferation and metastasis. Our results showed that low expression of MLL4 promotes NSCLC cell proliferation and metastasis and is required for the maintenance of NSCLC stem cell properties.
Conclusion Our findings identify an important role of MLL4 in lung carcinogenesis through transcriptional regulation of PIK3IP1, affecting the PI3K/AKT/SOX2 axis, and suggest that MLL4 could be a potential prognostic indicator and target for NSCLC therapy.
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Purpose Oligometastatic non–small cell lung cancer (NSCLC) patients have been increasingly regarded as a distinct group that could benefit from local treatment to achieve a better clinical outcome. However, current definitions of oligometastasis are solely numerical, which are imprecise because of ignoring the biological heterogeneity caused by genomic characteristics. Our study aimed to profile the molecular alterations of oligometastatic NSCLC and elucidate its potential difference from polymetastasis.
Materials and Methods We performed next-generation sequencing to analyze tumors and paired peripheral blood from 77 oligometastatic and 21 polymetastatic NSCLC patients to reveal their genomic characteristics and assess the genetic heterogeneity.
Results We found ERBB2, ALK, MLL4, PIK3CB, and TOP2A were mutated at a significantly lower frequency in oligometastasis compared with polymetastasis. EGFR and KEAP1 alterations were mutually exclusive in oligometastatic group. More importantly, oligometastasis has a unique significant enrichment of apoptosis signaling pathway. In contrast to polymetastasis, a highly enriched COSMIC signature 4 and a special mutational process, COSMIC signature 14, were observed in the oligometastatic cohort. According to OncoKB database, 74.03% of oligometastatic NSCLC patients harbored at least one actionable alteration. The median tumor mutation burden of oligometastasis was 5.00 mutations/Mb, which was significantly associated with smoking, DNA damage repair genes, TP53 mutation, SMARCA4 mutation, LRP1B mutation, ABL1 mutation.
Conclusion Our results shall help redefine oligometastasis beyond simple lesion enumeration that will ultimately improve the selection of patients with real oligometastatic state and optimize personalized cancer therapy for oligometastatic NSCLC.
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To ablate or not to ablate? Outcomes of local ablative treatments (LAT) for oncogene addicted (OA) oligo-metastatic (OM) non-small cell lung cancer (NSCLC): A systematic review Fabrizio Citarella, Cristina Fragale, Matteo Fiorenti, Maria Luisa Di Guglielmo, Noemi Mindicini, Alessio Cortellini, Alessandro Russo, Giuseppe Bronte Critical Reviews in Oncology/Hematology.2026; 218: 105096. CrossRef
Frequency and Prognostic Impact of Local Ablation Therapy for Oligoprogression in Non‐Small Cell Lung Cancer Daisuke Morinaga, Jun Sakakibara‐Konishi, Ryohei Kamada, Masahiro Kashima, Kosuke Tsuji, Shotaro Ito, Megumi Furuta, Tetsuaki Shoji, Yuta Takashima, Hidenori Kitai, Yasuyuki Ikezawa, Hiroshi Taguchi, Tatsuya Kato, Yoshiki Shinomiya, Kanako C Hatanaka, Yut Thoracic Cancer.2025;[Epub] CrossRef
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Genomic characteristics of PD-L1-Induced resistance to EGFR-TKIs in lung adenocarcinoma Guangming Yi, Fanghao Cai, Liangzhong Liu, Rongxin Liao, Xuan Jiang, Zhenzhou Yang, Xiaoyue Zhang Future Oncology.2024; 20(40): 3477. CrossRef
Purpose Brain metastasis is common in patients with epidermal growth factor receptor (EGFR)–mutant non–small cell lung cancer (NSCLC) at initial presentation. A previous study showed that brain radiotherapy (RT) before first-generation (first-G) EGFR–tyrosine kinase inhibitor (TKI) therapy is associated with longer overall survival than TKI therapy alone. However, there is no data regarding the role of additional brain RT before afatinib therapy.
Materials and Methods Between October 2014 and June 2019, EGFR-mutant NSCLC patients with brain metastases who started first-G EGFR-TKIs (gefitinib or erlotinib) or afatinib as first-line therapy were retrospectively analyzed. This study compared overall survival and intracranial progression-free survival (PFS) between patients who received EGFR-TKIs alone and EGFR-TKIs with brain RT and either a first-G EGFR-TKI or afatinib, respectively.
Results The median follow-up duration was 29.6 months (range, 1.5 to 116.9 months). In the first-G EGFR-TKI group (n=155), 94 patients (60.6%) received the first-G EGFR-TKI alone and 61 patients (39.4%) received brain RT prior to their first-G EGFR-TKI. In the afatinib group (n=204), 126 patients (61.8%) received afatinib alone and 78 patients (38.2%) received brain RT prior to afatinib. There was no difference in overall survival rates between the groups with RT (35.6 months: 95% confidence interval [CI], 27.9 to 43.3) and without RT (31.4 months: 95% CI, 23.9 to 38.9) in the afatinib group (p=0.58), but there was a significant difference in overall survival in the first-G EGFR-TKI group in a manner favoring additional brain RT (41.1 months: 95% CI, 30.5 to 51.7 vs. 25.8 months: 95% CI, 20.1 to 31.5; p=0.02). Meanwhile, median intracranial PFS was not different between patients who received EGFR-TKI therapy alone vs. EGFR-TKI therapy with brain RT in both the first-G EGFR-TKI (p=0.39) and afatinib (p=0.24) groups.
Conclusion Afatinib therapy alone showed comparable survival outcomes to those of afatinib with brain RT. The current study suggests that brain RT could be an optional, not mandatory, treatment modality when afatinib therapy is considered in patients with EGFR-mutant NSCLC.
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Cancer Res Treat. 2023;55(1):112-122. Published online July 19, 2022
Purpose Although osimertinib is the standard-of-care treatment of epidermal growth factor receptor (EGFR) T790M mutation–positive non–small cell lung cancer, real-world evidence on the efficacy of osimertinib is not enough to reflect the complexity of the entire course of treatment. Herein, we report on the use of osimertinib in patients with EGFR T790M mutation–positive non–small cell lung cancer who had previously received EGFR tyrosine kinase inhibitor (TKI) treatment in Korea.
Materials and Methods Patients with confirmed EGFR T790M after disease progression of prior EGFR-TKI were enrolled and administered osimertinib 80 mg daily. The primary effectiveness outcome was progression-free survival, with time-to-treatment discontinuation, treatment and adverse effects leading to treatment discontinuation, and overall survival being the secondary endpoints.
Results A total of 558 individuals were enrolled, and 55.2% had investigator-assessed responses. The median progression-free survival was 14.2 months (95% confidence interval [CI], 13.0 to 16.4), and the median time-to-treatment discontinuation was 15.0 months (95% CI, 14.1 to 15.9). The median overall survival was 36.7 months (95% CI, 30.9 to not reached). The benefit with osimertinib was consistent regardless of the age, sex, smoking history, and primary EGFR mutation subtype. However, hepatic metastases at the time of diagnosis, the presence of plasma EGFR T790M, and the shorter duration of prior EGFR-TKI treatment were poor predictors of osimertinib treatment. Ten patients (1.8%), including three with pneumonitis, had to discontinue osimertinib due to severe adverse effects.
Conclusion Osimertinib demonstrated its clinical effectiveness and survival benefit for EGFR T790M mutation–positive in Korean patients with no new safety signals.
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Purpose This network meta-analysis (NMA) was conducted to compare the efficacy of immune checkpoint inhibitors in advanced non–small cell lung cancer (NSCLC) patients with liver metastases.
Materials and Methods English literature was retrieved from the PubMed, American Society of Clinical Oncology, and European Society for Medical Oncology databases from January 2015 to January 2021. We pooled the overall survival (OS) and progression-free survival (PFS) hazard ratios (HRs) using an NMA and ranked treatments by the surface under the cumulative ranking curve. Publication bias was evaluated by Begg’s and Egger’s tests. STATA 15.0 was used for the sensitivity analysis, and the remaining statistical analyses were performed using R 4.0.2.
Results Nine eligible phase III randomized controlled trials were included, including 1,141 patients with liver metastases. Pembrolizumab+chemotherapy ranked highest, followed by atezolizumab+bevacizumab+chemotherapy and nivolumab. However, no significant difference in OS rates was observed across these three treatments (HR, 0.98; 95% confidence interval [CI], 0.43 to 2.22 for pembrolizumab+chemotherapy vs. atezolizumab+bevacizumab+chemotherapy; HR, 0.91; 95% CI, 0.52 to 1.57 for pembrolizumab+chemotherapy vs. nivolumab). Regarding the PFS rate, atezolizumab+bevacizumab+chemotherapy and pembro-lizumab+chemotherapy ranked highest and no significant difference was observed between them (HR, 0.79; 95% CI, 0.36 to 1.70 for atezolizumab+bevacizumab+chemotherapy vs. pembrolizumab+chemotherapy).
Conclusion Pembrolizumab+chemotherapy, atezolizumab+bevacizumab+chemotherapy, and nivolumab were superior to other treatments in NSCLC patients with liver metastases. These new findings may help clinicians better select therapeutic strategies for NSCLC patients with liver metastases.
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Purpose
To investigate the feasibility of biomarkers based on dynamic circulating tumor DNA (ctDNA) to classify small cell lung cancer (SCLC) into different subtypes.
Materials and Methods
Tumor and longitudinal plasma ctDNA samples were analyzed by next-generation sequencing of 1,021 genes. PyClone was used to infer the molecular tumor burden index (mTBI). Pre-treatment tumor tissues [T1] and serial plasma samples were collected (pre-treatment [B1], after two [B2], six [B3] cycles of chemotherapy and at progression [B4]).
Results
Overall concordance between T1 and B1 sequencing (n=30) was 66.5%, and 89.5% in the gene of RB1. A classification method was designed according to the changes of RB1 mutation, named as subtype Ⅰ (both positive at B1 and B2), subtype Ⅱ (positive at B1 but negative at B2), and subtype Ⅲ (both negative at B1 and B2). The median progressive-free survival for subtype Ⅰ patients (4.5 months [95%CI: 2.6-5.8]) was inferior to subtype Ⅱ (not reached, p<0.0001) and subtype Ⅲ (10.8 months [95%CI: 6.0-14.4], p=0.002). The median overall survival for subtype Ⅰ patients (16.3 months [95%CI: 5.3-22.9]) was inferior to subtype Ⅱ (not reached, p=0.01) and subtype Ⅲ (not reached, p=0.02). Patients with a mTBI dropped to zero at B2 had longer median overall survival (not reached vs. 19.5 months, p=0.01). The changes of mTBI from B4 to B1 were sensitive to predict new metastases, with a sensitivity of 100% and a specificity of 85.7%.
Conclusion
Monitoring ctDNA based RB1 mutation and mTBI provided a feasible tool to predict the prognosis of SCLC.
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Purpose Since tumor mutational burden (TMB) and gene expression profiling (GEP) have complementary effects, they may have improved predictive power when used in combination. Here, we investigated the ability of TMB and GEP to predict the immunotherapy response in patients with non–small cell lung cancer (NSCLC) and assessed if this combination can improve predictive power compared to that when used individually.
Materials and Methods This retrospective cohort study included 30 patients with NSCLC who received immune checkpoint inhibitors (ICI) therapy at the Seoul National University Bundang Hospital. programmed cell death-ligand-1 (PD-L1) protein expression was assessed using immunohistochemistry, and TMB was measured by targeted deep sequencing. Gene expression was determined using NanoString nCounter analysis for the PanCancer IO360 panel, and enrichment analysis were performed.
Results Eleven patients (36.7%) showed a durable clinical benefit (DCB), whereas 19 (63.3%) showed no durable benefit (NDB). TMB and enrichment scores (ES) showed significant differences between the DCB and NDB groups (p=0.044 and p=0.017, respectively); however, no significant correlations were observed among TMB, ES, and PD-L1. ES was the best single biomarker for predicting DCB (area under the curve [AUC], 0.794), followed by TMB (AUC, 0.679) and PD-L1 (AUC, 0.622). TMB and ES showed the highest AUC (0.837) among other combinations (AUC [TMB and PD-L1], 0.777; AUC [PD-L1 and ES], 0.763) and was similar to that of all biomarkers used together (0.832).
Conclusion The combination of TMB and ES may be an effective predictive tool to identify patients with NSCLC patients who would possibly benefit from ICI therapies.
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Purpose
Drug resistance is one of the main causes of chemotherapy failure in patients with small cell lung cancer (SCLC), and extensive biological studies into chemotherapy drug resistance are required.
Materials and Methods
In this study, we performed lncRNA microarray, in vitro functional assays, in vivo models and cDNA microarray to evaluate the impact of lncRNA in SCLC chemoresistance.
Results
The results showed that KCNQ1OT1 expression was upregulated in SCLC tissues and was a poor prognostic factor for patients with SCLC. Knockdown of KCNQ1OT1 inhibited cell proliferation, migration, chemoresistance and promoted apoptosis of SCLC cells. Mechanistic investigation showed that KCNQ1OT1 can activate transforming growth factor-β1 mediated epithelial-to-mesenchymal transition in SCLC cells.
Conclusion
Taken together, our study revealed the role of KCNQ1OT1 in the progression and chemoresistance of SCLC, and suggested KCNQ1OT1 as a potential diagnostic and prognostic biomarker in SCLC clinical management.
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Purpose
Squamous cell carcinomas (SqCC) of the lung often express high levels of thymidylate synthase (TS), which is associated with primary resistance to pemetrexed. We explored the efficacy of pemetrexed in a selected population of patients with lung SqCC with low TS expression.
Materials and Methods
In this single-arm phase II trial, we enrolled 32 previously-treated patients with advanced lung SqCC exhibiting low immunohistochemical staining for TS (i.e., in 10% or less of tumor cells). The primary endpoint was 12-week progression-free survival (PFS) rate.
Results
Of 32 patients, eight patients (25%) had an Eastern Cooperative Oncology Group performance status of 2, and seven patients (22%) had previously received three or more lines of chemotherapy. The disease control rate from pemetrexed treatment was 30%, and no objective response was observed. The 12-week PFS rate was 24.5% (95% confidence interval [CI], 13.0 to 46.1). Median PFS was 1.3 months (95% CI, 1.3 to 2.7), and median overall survival was 11.8 months (95% CI, 8.1 to not applicable). Most of adverse events were grade 1 or 2.
Conclusion
Pemetrexed demonstrated modest activity as a salvage chemotherapy in patients with advanced lung SqCC with low TS expression, although its toxicity was generally manageable.
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The non-small cell lung cancer with activating epidermal growth factor receptor (EGFR) mutation eventually acquires resistant to either first or second-generation EGFR tyrosine kinase inhibitor (TKI). As the following option, targeting EGFR T790M with third-generation EGFR TKI is now established as a standard treatment option. In this study, we are reporting the first case of resistance mechanism to the novel third-generation EGFR TKI, lazertinib, which showed promising clinical efficacy in phase 1-2 study. The patients showed resistance to the treatment by acquiring the additional EGFR C797S mutation in cis which is also confirmed from the patient-derived cell lines.
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Cancer Res Treat. 2020;52(4):1112-1119. Published online May 15, 2020
Purpose
The introduction of immune checkpoint inhibitors represents a major advance in the treatment of lung cancer, allowing sustained recovery in a significant proportion of patients. Nivolumab is a monoclonal anti–programmed death cell protein 1 antibody licensed for the treatment of locally advanced or metastatic non-small cell lung cancer (NSCLC) after prior chemotherapy. In this study, we describe the demographic and clinical outcomes of patients with advanced NSCLC treated with nivolumab in the Korean expanded access program.
Materials and Methods
Previously treated patients with advanced non-squamous and squamous NSCLC patients received nivolumab at 3 mg/kg every 2 weeks up to 36 months. Efficacy data including investigator-assessed tumor response, progression data, survival, and safety data were collected.
Results
Two hundred ninety-nine patients were treated across 36 Korean centers. The objective response rate and disease control rate were 18% and 49%, respectively; the median progression-free survival was 2.1 months (95% confidence interval [CI], 1.87 to 3.45), and the overall survival (OS) was 13.2 months (95% CI, 10.6 to 18.9). Patients with smoking history and patients who experienced immune-related adverse events showed a prolonged OS. Cox regression analysis identified smoking history, presence of immune-related adverse events as positive factors associated with OS, while liver metastasis was a negative factor associated with OS. The safety profile was generally comparable to previously reported data.
Conclusion
This real-world analysis supports the use of nivolumab for pretreated NSCLC patients, including those with an older age.
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Purpose
Caspase recruitment domain containing protein 9 (CARD9) has been demonstrated to be a pro-tumor factor in various cancers. However, our previous study found a significant decrease of CARD9 in malignant pleural effusion compared with benign pleural effusion. So we investigated the role of CARD9 in non-small cell lung cancer (NSCLC) and its working mechanism.
Materials and Methods
Immunohistochemistry, western blot, and quantitative real-time polymerase chain reaction were used to detect the expression of CARD9 in specimens of NSCLC patients. The Cancer Genome Atlas (TCGA) databasewas also used to analyze the expression of CARD9 in NSCLC and its predicting value for prognosis. Immunofluorescence was used for CARD9 cellular location. Cell growth assay, clonal formation assay, wound healing assay, matrigel invasion assay, and flow cytometry were used to test cell proliferation, migration, invasion, apoptosis, and cycle progression of NSCLC cells with CARD9 knockdown or CARD9 overexpression. Co-immunoprecipitation was used to identify the interaction between CARD9 and B-cell lymphoma 10 (BCL10). SB203580 was used to inhibit p38 activation.
Results
CARD9 was decreased in NSCLC tissues compared with normal tissues; low CARD9 expression was associated with poor survival. CARD9 was expressed both in tumor cells and macrophages. Downregulation of CARD9 in NSCLC cells enhanced the abilities of proliferation, invasion and migration via activated MAPK/p38 signaling, while overexpression of CARD9 presented antitumor effects. BCL10 was identified to interact with CARD9.
Conclusion
We demonstrate that CARD9 is an independent prognostic factor in NSCLC patients and inhibits proliferation, migration, and invasion by suppressing MAPK/p38 pathway in NSCLC cells.
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Purpose
Human epidermal growth factor receptor 2 (HER2) alterations are found in approximately 1%-3% of non-small cell lung cancers (NSCLCs). We evaluated the clinical features and outcomes of NSCLC harboring HER2 alteration detected by next-generation sequencing (NGS) in Korea.
Materials and Methods
A total of 1,108 patients who were diagnosed with NSCLC between December 2015 and December 2017 were screened and analyzed by NGS. Medical records were reviewed retrospectively to analyze the clinical characteristics and outcomes from various treatments.
Results HER2 alterations were identified in 36 NSCLC patients. Of the patients, 22 (61.1%) had an exon 20 in-frame insertion mutation, 15 (41.7%) had HER2 amplification, and one had both. The median patient age was 58 years, 55.6% were male, and 50.0% were never-smokers. Adenocarcinoma was predominant (88.9%). The most common metastatic site was bone (58.3%), and 66.7% of patients were stage IV at initial diagnosis. Six patients (16.7%) had a coexistent sensitizing epidermal growth factor receptor (EGFR) mutation, and two patients (5.6%) had anaplastic lymphoma kinase (ALK) rearrangement. With a median 14 months of follow-up, the median progression-free survival of first-line treatment was 6 months (95% confidence interval, 4.172 to 7.828), and median overall survival was not reached. The proportions of adenocarcinoma, never-smokers, and metastasis to the liver were higher in the exon 20 in-frame insertion mutation group, whereas coexistence of EGFR mutation was more frequently found in the HER2 amplification group.
Conclusion HER2-altered NSCLC showed distinct clinical features. Moreover, different characteristics were identified between the HER2 in-frame insertion mutation group and the HER2 amplification group.
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Cancer Res Treat. 2019;51(3):1001-1010. Published online October 15, 2018
Purpose
Lung Cancer Subcommittee of Korean Radiation Oncology Group (KROG) has recently launched a prospective clinical trial (KROG 17-06) of hippocampus-sparing whole brain radiotherapy (HS-WBRT) with simultaneous integrated boost (SIB) in treating multiple brain metastases from non-small cell lung cancer. In order to improve trial quality, dummy run studies among the participating institutions were designed. This work reported the results of two-step dummy run procedures of the KROG 17-06 study.
Materials and Methods
Two steps tested hippocampus contouring variability and radiation therapy planning compliance. In the first step, the variation of the hippocampus delineation was investigated for two representative cases using the Dice similarity coefficients. In the second step, the participating institutions were requested to generate a HS-WBRT with SIB treatment plan for another representative case. The compliance of the treatment plans to the planning protocol was evaluated.
Results
In the first step, the median Dice similarity coefficients of the hippocampus contours for two other dummy run cases changed from 0.669 (range, 0.073 to 0.712) to 0.690 (range, 0.522 to 0.750) and from 0.291 (range, 0.219 to 0.522) to 0.412 (range, 0.264 to 0.598) after providing the hippocampus contouring feedback. In the second step, with providing additional plan priority and extended dose constraints to the target volumes and normal structures, we observed the improved compliance of the treatment plans to the planning protocol.
Conclusion
The dummy run studies demonstrated the notable inter-institutional variability in delineating the hippocampus and treatment plan generation, which could be decreased through feedback from the trial center.
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Cancer Res Treat. 2019;51(2):623-631. Published online July 23, 2018
Purpose
Epidermal growth factor receptor (EGFR) exon 20 insertion mutations account for approximately 4% of all EGFR mutations. Given the rarity of this mutation, its clinical outcomes are not fully established.
Materials and Methods
Between 2009 and 2017, non-small cell lung cancer (NSCLC) patients who showed an exon 20 insertion were retrospectively reviewed for clinical characteristics and outcomes, including responses to chemotherapy (CTx) or targeted therapy.
Results
Of 3,539 NSCLC patients who harbored an activating EGFR mutation, 56 (1.6%) had an exon 20 insertion. Of the advanced NSCLC patients, 27 of 1,479 (1.8%) had an exon 20 insertion. The median overall survival was 29.4 months (95% confidence interval 9.3 to 49.6) for 27 advancedNSCLC patients. The 22 patientswho received systemic CTx achieved a 50.0% response rate and a 77.2% disease control rate, with 4.2 months of progressionfree survival. Six patients received EGFR tyrosine kinase inhibitors (TKIs). Three of the four patients that had only an exon 20 insertion showed progressive disease, while one showed stable disease. The othertwo patients had an exon 20 insertion and another EGFR mutation and achieved a partial response.
Conclusion
The incidence of an exon 20 insertion mutation is rare in Korea and occasionally accompanied by other common EGFR mutations. Although the response to systemic CTx. in these patients is comparable to that of patients with other mutations, the response rate to firstor second-generation EGFR TKIs is quite low. Therefore, the development of a more efficient agent is urgently needed.
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Cancer Res Treat. 2019;51(2):493-501. Published online June 18, 2018
Purpose
This study was conducted to evaluate the relationship between epidermal growth factor receptor (EGFR) mutation and clinical outcomes in patients with stage III non-squamous cell lung cancer treated with definitive concurrent chemoradiotherapy (CCRT).
Materials and Methods
From January 2008 to December 2013, the medical records of 197 patients with stage III non- squamous non-small cell lung cancer treated with definitive CCRT were analyzed to determine progression-free survival (PFS) and overall survival (OS) according to EGFR mutation status.
Results
Among 197 eligible patients, 81 patients were EGFR wild type, 36 patients had an EGFR mutation (exon 19 Del, n=18; L858R, n=9, uncommon [G719X, L868, T790M], n=9), and 80 patients had unknown EGFR status. The median age was 59 years (range, 28 to 80 years) and 136 patients (69.0%) were male. The median follow-up duration was 66.5 months (range, 1.9 to 114.5 months). One hundred sixty-four patients (83.2%) experienced disease progression. Median PFS was 8.9 months for the EGFR mutation group, 11.8 months for EGFR wild type, and 10.5 months for the unknown EGFR group (p=0.013 and p=0.042, respectively). The most common site of metastasis in the EGFR mutant group was the brain. However, there was no significant difference in OS among the three groups (34.6 months for EGFR mutant group vs. 31.9 months for EGFR wild type vs. 22.6 months for EGFR unknown group; p=0.792 and p=0.284). A total of 29 patients (80.6%) with EGFR mutation were treated with EGFR tyrosine kinase inhibitor (gefitinib, n=24; erlotinib, n=3; afatinib, n=2) upon progression.
Conclusion
EGFR mutation is associatedwith short PFS and the brain is the most common site of distant metastasis in patients with stage III non- squamous cell lung cancer treated with CCRT.
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Cancer Res Treat. 2016;48(1):80-87. Published online March 2, 2015
Purpose This study aimed to evaluate the efficacy and safety of pemetrexed versus gefitinib in patients with advanced non-small cell lung cancer (NSCLC) previously treated with chemotherapy. Materials and Methods Patients with advanced (stage IIIB or IV) or recurrent NSCLC were randomly assigned to receive either 500 mg/m² of pemetrexed intravenously every 3 weeks or gefitinib 250 mg/day orally. The primary end point was progression-free survival (PFS) at 6 months.
Results A total of 95 patients were enrolled (47 for pemetrexed and 48 for gefitinib). Most patients were male (72%) and current/ex-smokers (69%), and 80% had non-squamous cell carcinoma. The epidermal growth factor receptor (EGFR) mutation status was determined in 38 patients (40%); one patient per each arm was positive for EGFRmutation. The 6-month PFS rates were 22% and 15% for pemetrexed and gefitinib, respectively (p=0.35). Both arms showed an identical median PFS of 2.0 months and a median overall survival (OS) of 8.5 months. In EGFR wild-type patients, higher response rate (RR) and longer PFS as well as OS were achieved via pemetrexed compared with gefitinib, although there were no significant differences (RR: 39% vs. 9%, p=0.07; median PFS: 6.6 months vs. 3.1 months, p=0.45; median OS: 29.6 months vs. 12.9 months, p=0.62). Toxicities were mild in both treatment arms. Frequently reported toxicities were anemia and fatigue for pemetrexed, and skin rash and anorexia for gefitinib. Conclusion Both pemetrexed and gefitinib had similar efficacy with good tolerability as second-line treatment in unselected patients with advanced NSCLC. However, pemetrexed is considered more effective than gefitinib for EGFR wild-type patients.
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