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
Immune checkpoint inhibitors (ICIs) have become a standard therapy for metastatic hepatocellular carcinoma (HCC), often as an alternative to tyrosine kinase inhibitors (TKIs). However, safety data combining ICIs with stereotactic ablative radiotherapy (SABR) remain limited. We compared the safety and efficacy of SABR combined with ICIs versus TKIs in patients with extrahepatic metastatic HCC.
Materials and methods
This single-center retrospective study included patients with HCC who received SABR for extrahepatic metastases combined with either TKIs or ICIs within 30 days of SABR between January 2010 and June 2024. Adverse events (AEs; CTCAE v5.0) and oncologic outcomes were evaluated using logistic regression and Cox models.
Results
Among 103 patients with 128 SABR-treated lesions, 72 patients (90 lesions) received SABR+TKI and 31 patients (38 lesions) received SABR+ICI. Acute AEs occurred only in the SABR+TKI group (8.9%), predominantly grade 1. Grade 3 late AEs were rare, occurring in one case in each group, while late AEs of lower grades were more frequent with SABR+ICI (any-grade: 57.9% vs. 25.6%, p<0.001; grade ≥2: 23.7% vs. 8.9%, p=0.024). Multivariable analysis showed borderline increased risk of grade ≥2 late AEs with SABR+ICI (p=0.052). One-year local control, progression-free survival, and overall survival were 76.6%, 35.3%, and 72.3% respectively, with no significant differences between groups.
Conclusion
Metastasis-directed SABR combined with either TKIs or ICIs was generally well tolerated in patients with extrahepatic metastatic HCC, with rare grade 3 late AEs; grade ≥2 late AEs were more frequent with SABR plus ICIs, warranting prospective evaluation.
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 Comprehensive genomic profiling of early-stage non-small cell lung cancer (NSCLC) with epidermal growth factor receptor (EGFR) mutations remains limited. This study aimed to investigate genomic profiles of early- and advanced-stage EGFR-mutant NSCLC and identify potential innate resistance mechanisms to EGFR-tyrosine kinase inhibitors (TKIs) using targeted next-generation sequencing (NGS).
Materials and Methods This retrospective observational study analyzed genomic profiles of patients with early-stage (IA-IIIA) and advanced-stage (IIIB-IV) EGFR-mutant NSCLC from the Lung Cancer NGS registry. Targeted NGS was performed to assess concurrent genetic alterations (GAs), tumor mutational burden (TMB), and variant allele frequency (VAF) of EGFR mutations.
Results Overall, 160 patients (100 early-stage and 60 advanced-stage) were analyzed. The proportion of patients with concurrent GAs was not significantly different between stages (82.0% vs. 91.7%, p=0.092). Median TMB was 3.8 mutations/Mb in both stages, with no significant difference (p=0.206). However, the median VAF of EGFR mutations was significantly lower in early-stage compared to that in advanced-stage (19.3% vs. 29.6%, p=0.002). While TMB remained unchanged with disease progression (p=0.192), VAF of EGFR mutations increased significantly (p < 0.001). Moreover, the frequencies of concurrent single nucleotide variants and copy number variants were significantly lower in early-stage NSCLC.
Conclusion Genomic heterogeneity in EGFR-mutant NSCLC arises early in tumorigenesis. The comparable TMB and lower VAF of EGFR mutations in early-stage disease suggest that innate resistance to EGFR-TKIs may be driven by concurrent GAs, supporting the consideration of combination therapies even in early-stage EGFR-mutant NSCLC.
Purpose Non–small cell lung cancer (NSCLC) frequently harbors targetable epidermal growth factor receptor (EGFR) mutations. However, rare variants such as EGFR L858M or L861R remain poorly characterized. This study aimed to elucidate the oncogenic potential and EGFR tyrosine kinase inhibitors (TKIs) sensitivity of the EGFR L858M/L861R mutation to inform personalized treatment strategies.
Materials and Methods Tumor samples from an NSCLC patient were analyzed using targeted panel sequencing and confirmed with the FoundationOne Liquid CDx assay. EGFR-mutant constructs, including L858M, L858R, L861R, L861Q, L858M/L861R, and L858R/L861Q, were generated and transduced into various cell lines. Cell viability, immunoblot, and soft agar colony formation assays were conducted to assess the oncogenicity and drug sensitivity, while computational protein modeling and docking simulations evaluated the drug-binding affinities of EGFR-TKIs.
Results Ba/F3 cells expressing the EGFR L858M/L861R mutation exhibited robust interleukin-3–independent proliferation accompanied by markedly increased EGFR phosphorylation, while NIH-3T3 cells showed anchorage-independent colony formation. Compared to other mutations, cells expressing EGFR L858M/L861R mutation were less sensitive to first-generation EGFR-TKIs (gefitinib, erlotinib) and third-generation EGFR-TKIs (osimertinib, lazertinib), whereas second-generation EGFR-TKIs (afatinib, poziotinib) demonstrated potent inhibitory effects. Computational modeling revealed a narrower drug-binding efficiency of first-generation inhibitors.
Conclusion The EGFR L858M/L861R mutation drives strong oncogenic signaling and exhibits preferential sensitivity to second-generation EGFR-TKIs. These findings underscore the importance of accurate molecular diagnosis for guiding effective, personalized therapeutic strategies in NSCLC.
Citations
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Hee Young Ju, Hyoung Soo Choi, Hyeon Jin Park, Keon Hee Yoo, Chuhl Joo Lyu, Ho Joon Im, Min Kyoung Kim, Yeung-Chul Mun, Joon Ho Moon, Sung-Soo Yoon, Eunyoung Lee, Jae Hoon Lee, Je-Hwan Lee, So Young Chong, June-Won Cheong, Seunghyun Won, on behalf of the Korean Society of Blood and Marrow Transplantation
Cancer Res Treat. 2026;58(2):632-641. Published online May 7, 2025
Purpose
Chronic myeloid leukemia (CML) in children, adolescents, and young adults is rare and differs from older adults. This study evaluated the outcomes of allogeneic hematopoietic stem cell transplantation (HSCT) in young Korean CML patients during the tyrosine kinase inhibitor (TKI) era.
Materials and Methods
A retrospective analysis of 35 CML patients aged < 40 years who underwent allogeneic HSCT from 2009 to 2019 was conducted using Korean Blood and Marrow Transplantation Registry data. Patients were grouped by age < 20 years at HSCT (group 1, n=15) and 20-40 years at HSCT (group 2, n=20). Survival outcomes including overall survival (OS), relapse-free survival (RFS), and event-free survival (EFS) were analyzed using the Kaplan-Meier method.
Results
The median time between diagnosis and HSCT was 8.9 months. All the patients achieved engraftment but platelet recovery was significantly slower in group 1 (p=0.034). Acute and chronic graft-versus-host disease occurred in 54.3% and 34.3%, respectively. Five-year OS, RFS, and EFS rates of total patients were 66.8%, 50.8%, and 47.6%, with better OS was observed in group 1 by multivariable analysis (p=0.048). Disease status at HSCT was a significant predictor of OS (p=0.028), RFS (p=0.003), and EFS (p=0.004). Disease progression occurred in 13 out of 35 patients (37.1%); treatment-related mortality accounted for 63.6% of deaths (7 out of 11).
Conclusion
When performed at a younger age, allogeneic HSCT result in superior outcome in CML. Achieving remission before HSCT is critical for improved outcomes, highlighting the importance of pretransplant remission via optimal TKI strategies and minimal residual disease monitoring.
Purpose The prognosis of patients with hepatocellular carcinoma (HCC) and portal vein tumor thrombus (PVTT) is extremely poor, and systemic therapy is currently the mainstream treatment. This study aimed to assess the efficacy and safety of lenvatinib combined with anti–programmed cell death-1 antibodies and transcatheter arterial chemoembolization (triple therapy) in patients with HCC and PVTT.
Materials and Methods This retrospective multicenter study included patients with HCC and PVTT who received triple therapy, were aged between 18 and 75 years, classified as Child-Pugh class A or B, and had at least one measurable lesion. The overall survival (OS), progression-free survival (PFS), objective response rates, and disease control rates were analyzed to assess efficacy. Treatment-related adverse events were analyzed to assess safety profiles.
Results During a median follow-up of 11.23 months (range, 3.07 to 34.37 months), the median OS was greater than 24 months, and median PFS was 12.53 months. The 2-year OS rate was 54.9%. The objective response rate and disease control rate were 69.8% (74/106) and 84.0% (89/106), respectively; 20.8% (22/106) of the patients experienced grade 3/4 treatment-related adverse events and no treatment-related deaths occurred. The conversion rate to liver resection was 31.1% (33/106), with manageable postoperative complications. The median OS was not reached in the surgery group, but was 19.08 months in the non-surgery group. The median PFS in the surgery and non-surgery groups were 20.50 and 9.00 months, respectively.
Conclusion Triple therapy showed promising survival benefits and high response rates in patients with HCC and PVTT, with manageable adverse effects.
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Purpose In this study, we evaluated 66 patients diagnosed with adenoid cystic carcinoma (ACC) enrolled in two Korean Cancer Study Group trials to investigate the response and progression patterns in recurrent and/or metastatic ACC treated with vascular endothelial growth factor receptor tyrosine kinase inhibitors (VEGFR-TKIs).
Materials and Methods We evaluated 66 patients diagnosed with ACC who were enrolled in the Korean Cancer Study Group trials. The tumor measurements, clinical data, treatment outcomes, and progression patterns of therapy were analyzed.
Results In the 66 patients (53 receiving axitinib and 13 receiving nintedanib), the disease control rate was 61%, and three patients achieved partial response. The median follow-up, median progression-free survival (PFS), overall survival, and 6-month PFS rate were 27.6%, 12.4%, and 18.1% months and 62.1%, respectively. Among 42 patients who experienced progression, 27 (64.3%) showed target lesion progression. Bone metastasis was an independent poor prognostic factor.
Conclusion Overall, most patients demonstrated stable disease with prolonged PFS; however, prominent target lesion progression occurred in some patients. Thus, PFS may capture VEGFR-TKI efficacy better than the objective response rate.
Purpose We aimed to evaluate whether the addition of pemetrexed is effective in improving progression-free survival (PFS) in epidermal growth factor receptor (EGFR)–mutated patients with or without concomitant alterations.
Materials and Methods This multicenter clinical trial was conducted in China from June 15, 2018, to May 31, 2019. A total of 92 non–small cell lung cancer (NSCLC) patients harboring EGFR-sensitive mutations were included and divided into concomitant and non-concomitant groups. Patients in each group were randomly treated with EGFR–tyrosine kinase inhibitor (TKI) monotherapy or EGFR-TKI combined with pemetrexed in a ratio of 1:1. PFS was recorded as the primary endpoint.
Results The overall median PFS of this cohort was 10.1 months. There were no significant differences in PFS between patients with and without concomitant and between patients received TKI monotherapy and TKI combined with pemetrexed (p=0.210 and p=0.085, respectively). Stratification analysis indicated that patients received TKI monotherapy had a significantly longer PFS in non-concomitant group than that in concomitant group (p=0.002). In concomitant group, patients received TKI combined with pemetrexed had a significantly longer PFS than patients received TKI monotherapy (p=0.013). Molecular dynamic analysis showed rapidly emerging EGFR T790M in patients received TKI monotherapy. EGFR mutation abundance decreased in patients received TKI combined chemotherapy, which supports better efficacy for a TKI combined chemotherapy as compared to TKI monotherapy. A good correlation between therapeutic efficacy and a change in circulating tumor DNA (ctDNA) status was found in 66% of patients, supporting the guiding role of ctDNA minimal residual disease (MRD) in NSCLC treatment.
Conclusion EGFR-TKI monotherapy is applicable to EGFR-sensitive patients without concomitant alterations, while a TKI combined chemotherapy is applicable to EGFR-sensitive patients with concomitant alterations. CtDNA MRD may be a potential biomarker for predicting therapeutic efficacy.
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Purpose This study aimed to explore the impact of ABL1–tyrosine kinase inhibitors (TKIs) adherence on the survival of chromosome-positive (Ph+) acute lymphoblastic leukemia (ALL) children and clarify the potential predictors of patients’ prognosis from TKIs intake practices.
Materials and Methods Ninety newly diagnosed Ph+ ALL patients who received TKIs were enrolled. We collected the baseline characteristics and adverse events in all children; moreover, TKIs adherence was measured by an eight-item Morisky medication adherence scale (MMAS-8). Progression-free survival (PFS) and overall survival (OS) analysis were performed, and risk factors for PFS and OS were evaluated.
Results Among all patients, 69 cases were regarded as adherers, while 21 were non-adherers. The median duration of TKIs interruption was significantly prolonged in the non-adherence group than in the adherence group (13 [0-101] vs. 56 [11-128], p < 0.001). Additionally, dose reduction occurred in 55.2% of non-adherers versus 23.0% of adherers (p=0.002). The PFS and OS in adherers were significantly higher versus non-adherers (p=0.020 and p=0.039). MMAS-8 score was an independent risk factor for PFS (p=0.010) and OS (p=0.031). Among non-adherers, the median OS was only 23.1% (4.2%-42%) in patients aged ≤ 10 years versus 54.4% (38.8%-70%) in adolescents. Most of the patients who experienced TKIs non-adherence suffered pancytopenia.
Conclusion TKIs adherence during treatment significantly influenced the survival of pediatric Ph+ ALL patients, and non-adherers with age ≤ 10 years were more vulnerable to TKIs disruption. The cumulative TKIs dose should be especially emphasized to patients with age ≤ 10 years, which may result in an inferior achievement of relevant treatment milestones.
Purpose
Although it has been suggested that pulmonary tuberculosis (TB) is associated with increased risk of lung cancer, the exact mechanism is not clearly identified. We investigated the effect of pulmonary TB on the epidermal growth factor receptor (EGFR) mutational status and clinical outcome in patients with pulmonary adenocarcinoma.
Materials and Methods
We reviewed data of patients diagnosed with pulmonary adenocarcinoma harboring EGFR mutations and treated at our institution from 2008 to 2015. We divided our population into two groups: patients with pre-existing TB lesions on chest computed tomography scan (TB group) and those without the lesions (non-TB group). We compared the differences in EGFR mutational status, response to tyrosine kinase inhibitors (TKIs) and survival between the two groups.
Results
A total of 477 patients with pulmonary adenocarcinoma were analyzed. One hundred eighty-three patients (39%) had EGFR-mutated tumors and 100 (21%) patients had pre-existing TB lesions. The frequency of EGFR mutation was significantly higher in the TB group compared with the non-TB group (56% vs. 34%, p=0.038). Pre-existing TB lesions were independently associated with more frequent EGFR mutations in multivariate analysis (odds ratio, 1.43). In addition, both the progression-free survival (9.1 months vs. 11.6 months, p=0.020) and the overall survival (19.4 months vs. 24.5 months, p=0.014) after first-line EGFR-TKIs were significantly shorter in the TB group than in the non-TB group.
Conclusion
Previous pulmonary TB may be associated with more frequent EGFR mutations and poorer treatment response to EGFR-TKIs in patients with pulmonary adenocarcinoma.
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Purpose
The study investigated whether a replacement of neutrophil count and platelet count by neutrophil-to-lymphocyte ratio (NLR) and platelet-to-lymphocyte ratio (PLR) within the International Metastatic Renal Cell Carcinoma Database Consortium (IMDC) model would improve its prognostic accuracy.
Materials and Methods
This retrospective analysis included consecutive patients with metastatic renal cell carcinoma treated with first-line tyrosine kinase inhibitors. The IMDC and modified-IMDC models were compared using: concordance index (CI), bias-corrected concordance index (BCCI), calibration plots, the Grønnesby and Borgan test, Bayesian Information Criterion (BIC), generalized R2, Integrated Discrimination Improvement (IDI), and continuous Net Reclassification Index (cNRI) for individual risk factors and the three risk groups.
Results
Three hundred and twenty-one patients were eligible for analyses. The modified-IMDC model with NLR value of 3.6 and PLR value of 157 was selected for comparison with the IMDC model. Both models were well calibrated. All other measures favoured the modified-IMDC model over the IMDC model (CI, 0.706 vs. 0.677; BCCI, 0.699 vs. 0.671; BIC, 2,176.2 vs. 2,190.7; generalized R2, 0.238 vs. 0.202; IDI, 0.044; cNRI, 0.279 for individual risk factors; and CI, 0.669 vs. 0.641; BCCI, 0.669 vs. 0.641; BIC, 2,183.2 vs. 2,198.1; generalized R2, 0.163 vs. 0.123; IDI, 0.045; cNRI, 0.165 for the three risk groups).
Conclusion
Incorporation of NLR and PLR in place of neutrophil count and platelet count improved prognostic accuracy of the IMDC model. These findings require external validation before introducing into clinical practice.
Citations
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