Publications by authors named "Hyehyun Jeong"

Background & Aims: Surgery is the only curative therapeutic option for resectable extrahepatic cholangiocarcinoma, but recurrence is common, and prognosis is poor. There is an unmet clinical need for improved decision-making regarding adjuvant chemotherapy (ACT). Herein, we evaluated the usefulness of monitoring longitudinal circulating tumor DNA (ctDNA) for molecular residual disease (MRD) in patients from the STAMP trial, which compares the efficacy of adjuvant capecitabine (CAP) vs.

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Background And Aims: Pancreatic ductal adenocarcinoma (PDAC) often presents as acute pancreatitis (AP). However, data on the clinical outcomes of PDAC initially presenting as AP are limited. We aimed to assess the clinical features of PDAC that manifest as AP.

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The clinical impact of 16α-F-fluoro-17β-estradiol (F-FES) PET/CT on patient management has not been well investigated. The aim of this study was to assess the clinical impact of F-FES PET/CT on the management of patients with recurrent or metastatic breast cancer. Study subjects were identified retrospectively from a database of a prospective trial for postmarketing surveillance of F-FES between 2021 and 2023.

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Introduction: This multicenter phase I/IIa study aimed to determine the recommended phase II dose (RP2D) and evaluate the safety and preliminary efficacy of liposomal irinotecan (nal-IRI), oxaliplatin, and S-1 (NASOX) as first-line treatment for advanced pancreatic adenocarcinoma.

Methods: Patients with locally advanced or metastatic pancreatic adenocarcinoma without prior systemic treatment for advanced disease, aged ≥ 19 years, with measurable disease, and Eastern Cooperative Oncology Group performance status of 0-1 were eligible. The primary endpoints were to determine the dose-limiting toxicity (DLT) in the phase I cohort and overall response rate (ORR) in the phase IIa cohort.

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Article Synopsis
  • - The study analyzed the effectiveness of cytotoxic chemotherapy, specifically doxorubicin combined with dacarbazine, in treating recurrent desmoid tumors in 25 patients from two hospitals in Korea between 2007 and 2020.
  • - Results showed a significant objective response rate of 64% and a disease control rate of 96%, with a median follow-up of 55 months demonstrating a 3-year progression-free survival (PFS) rate of 65% and overall survival (OS) rate of 89%.
  • - Despite manageable severe hematologic side effects in some patients, the findings suggest that this treatment could be a viable option for those battling progressive desmoid tumors.
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Background: Modified FOLFIRINOX (mFOLFIRINOX) is one of the standard first-line therapies in borderline resectable pancreatic cancer (BRPC) and locally advanced unresectable pancreatic cancer (LAPC). However, there is no globally accepted second-line therapy following progression on mFOLFIRINOX.

Methods: Patients with BRPC and LAPC (n = 647) treated with first-line mFOLFIRINOX between January 2017 and December 2020 were included in this retrospective analysis.

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  • The EXPLORE-LC initiative addresses the lack of comprehensive data on non-small cell lung cancer (NSCLC) by creating a common framework for research across various high-quality sources, aiming to enhance understanding of NSCLC and identify unmet needs in specific patient subgroups.
  • A multicenter cohort study in South Korea evaluated clinical characteristics, treatment patterns, and overall survival of 22,101 NSCLC patients diagnosed from 2014 to 2019, using standardized data collection methods.
  • Results showed that the majority of patients had nonsquamous NSCLC (78.5%), with significant insights into treatment outcomes and characteristics, highlighting demographic factors such as age and gender distribution in different NSCLC types.
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  • - The study focuses on the increasing significance of exon 20 insertion mutations (E20ins) in EGFR and HER2 within non-small cell lung cancer (NSCLC) patients, highlighting the growing number of targeted therapies available for these mutations.
  • - Between December 2013 and July 2021, researchers identified E20ins in 107 patients, with a notable discordance rate of 53.1% between identification methods (PCR and NGS) for EGFR mutations, indicating the importance of using advanced testing methods like NGS for accurate detection.
  • - The results showed that targeted therapies for E20ins significantly outperformed traditional platinum-based treatments, achieving better objective response rates and progression-free survival, underscoring
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In recent years, endocrine therapy (ET), an effective systemic treatment for the management of estrogen receptor (ER)-positive breast cancers, has regained interest as a neoadjuvant therapy based on evidence that ET can fulfill the aim of neoadjuvant systemic treatment for tumor shrinkage as well as elucidate important clinical information on endocrine sensitivity that enables the prognostication of patients. Moreover, neoadjuvant endocrine therapy (NET) potentially provides an opportunity for early assessment of the clinical efficacy of novel agents. Furthermore, recently reported trials have generated evidence for a more tailored approach for perioperative management of ER-positive breast cancer using clinical and molecular biomarkers, and this has provided a rationale that enables the broadening of clinical indications for NET.

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The prognostic role of the recurrence score (RS) based on the 21-gene expression assay in premenopausal women is not well delineated, and we investigated the association of outcomes and the RS in premenopausal patients who had 21-gene expression assay at Asan Medical Center, Seoul, Korea, between June 2005 and July 2018. Invasive breast cancer-free survival (IBCFS) by STEEP version 2.0 was compared according to the RS and clinical risk factors.

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Background: The transition of human epidermal growth factor receptor 2 (HER2) status after neoadjuvant chemotherapy (NAC) in HER2-low breast cancer has not been thoroughly evaluated. Here, we evaluated the HER2 transition among HER2-zero and HER2-low breast cancer cases post-NAC and its impact on clinical outcomes.

Methods: We included 1288 patients with HER2-low or zero breast cancer who underwent NAC and surgery between 2014 and 2018 and had paired pre- and post-therapeutic HER2 status results.

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Background And Aims: The effectiveness of gemcitabine-based adjuvant chemotherapy is unclear in cholangiocarcinoma. We investigated the role of adjuvant gemcitabine plus cisplatin (GemCis) in a homogeneous group of high-risk patients with resected, lymph node-positive extrahepatic cholangiocarcinoma.

Approach And Results: Adenocarcinoma of perihilar or distal bile duct with regional lymph node metastasis who underwent curative-intent surgery (R0/R1) was eligible.

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Background: The interest in HER2-low breast cancer (BC) has increased in recent years with the development of novel anti-HER2 antibody-drug conjugates. Here, we investigated the clinical outcomes and relapse patterns of patients with HER2-low or -zero BCs in an Asian population.

Methods: We retrospectively identified HER2-low or -zero BC patients with stage I-III tumours who were treated with neoadjuvant chemotherapy and underwent curative surgery, between 2014 and 2018 at Asan Medical Center, Seoul, Korea.

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  • Immune checkpoint inhibitors (ICIs) significantly improve outcomes in advanced non-small-cell lung cancer (NSCLC), but their effectiveness for brain metastases is less understood, prompting this study to analyze real-world outcomes in such patients.
  • The study retrospectively examined 55 NSCLC patients with brain metastases treated solely with ICIs, revealing a median overall survival of 17 months and a median progression-free survival of 3.19 months, with an objective response rate of 36% for brain lesions.
  • Findings suggest that ICIs can be effective for controlling brain metastases, indicating that careful monitoring alone may be a viable approach for asymptomatic patients instead of immediate local therapy.
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Among patients with diffuse large B-cell lymphoma (DLBCL) involving the same side of the diaphragm, the prognostic implications of extranodal disease or its contiguity with the nodal lesion remain unclear. In this study, patients with DLBCL treated with R-CHOP whose disease was limited to the same side of the diaphragm were included. Survival was assessed by the presence, contiguity, and number of extranodal lesions.

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Background: In systemic light-chain (AL) amyloidosis, cardiac involvement is a major determinant of survival; however, cardiac response is limited even after systemic treatment in a majority of patients, and some require heart transplantation. Additionally, limited information is available on specific indications for heart transplantation. We aimed to explore clinical outcomes of cardiac amyloidosis and its association with heart transplantation, including identifying factors favoring heart transplantation amenability.

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Introduction: Young-onset colorectal cancer (YOCR) is increasing. This study aimed to determine the difference between advanced YOCR and non-YOCR patient outcomes.

Methods: We retrospectively included patients with recurrent/metastatic colorectal cancer treated with palliative systemic therapy between 2016 and 2018.

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  • A study established a detailed sarcoma-specific database in Korea, compiling 28 years of data on adult bone and soft tissue sarcoma patients treated from 1989 to 2017.
  • The analysis included 3,420 patients, revealing that soft tissue sarcomas were more prevalent than bone sarcomas, with median ages at diagnosis of 50 and 37, respectively.
  • Findings showed notable shifts in treatment approaches over time, including a decline in surgery-only treatments and an increase in adjuvant chemotherapy and radiotherapy, with older age linked to poorer survival outcomes.
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Purpose: In hormone receptor-positive, human epidermal growth factor receptor 2-negative metastatic breast cancer (HR+ HER2-MBC), the mainstay treatment options include cyclin-dependent kinase 4/6 inhibitors (CDK4/6i) and everolimus (EVE) in combination with endocrine treatment. This study aims to compare the outcomes of the following treatment sequences: CDK4/6i followed by EVE and EVE followed by CDK4/6i.

Materials And Methods: Data from HR+ HER2- MBC patients treated between January 2014 and November 2020 with both CDK4/6i and EVE were retrospectively analyzed.

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Purpose: This study aims to evaluate the prognosis of pathologically node-positive bladder cancer after neoadjuvant chemotherapy, the role of adjuvant chemotherapy in these patients, and the value of preoperative clinical evaluation for lymph node metastases.

Materials And Methods: Patients who received neoadjuvant chemotherapy followed by partial/radical cystectomy and had pathologically confirmed lymph node metastases between January 2007 and December 2019 were identified and analyzed.

Results: A total of 53 patients were included in the study.

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The phase 2 LEO study showed that everolimus (EVE) plus letrozole (LET) with ovarian suppression increased progression-free survival (PFS) in tamoxifen-exposed premenopausal women with hormone receptor-positive, HER2-negative metastatic breast cancer with visceral metastases. Here we report final survival outcomes from the LEO study, and the results of exploratory analyses of bone turnover marker changes and bone-specific progressive disease. Patients who were exposed to or progressed on tamoxifen as adjuvant/palliative treatments were randomly assigned (2:1) to the EVE (leuprorelin + LET + EVE, n = 92) or LET (leuprorelin + LET, n = 45) arm.

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Despite central nervous system (CNS) relapse occurring in >10% of high-risk diffuse large B-cell lymphoma (DLBCL) patients, the role of CNS-directed prophylaxis is controversial in the absence of randomized controlled trials. In this retrospective study, we aimed to evaluate the safety and efficacy of prophylactic high-dose methotrexate (HD-MTX) on CNS relapse and survival outcomes in 258 newly diagnosed R-CHOP (rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone)-treated high-risk DLBCL patients, based on the initial treatment intent (ITT) of the physician on the use of prophylactic HD-MTX. Patients were classified into an ITT HD-MTX group (n = 128) and a non-ITT HD-MTX group (n = 130).

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Introduction The combination of an anti-angiogenic agent with cytotoxic chemotherapy is a standard treatment strategy for metastatic colorectal cancer. CKD-516 is an oral vascular disrupting agent that was preliminarily shown to be safe and efficacious as a monotherapy in refractory solid cancers. We evaluated the recommended phase 2 dose, safety, and preliminary efficacy of CKD-516 in combination with irinotecan in treatment-refractory metastatic colorectal cancer.

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Purpose: This study aimed to investigate the clinical outcomes with gemcitabine-carboplatin (GCb), the standard treatment for patients with advanced urothelial carcinoma (UC) who are ineligible for cisplatin-based regimens, in advanced UC patients with a glomerular filtration rate (GFR) < 30 mL/min.

Materials And Methods: A retrospective cohort study involving GCb-treated advanced UC patients with GFR < 60 mL/min (n=89) was performed. Clinical outcomes were compared between subgroups with GFR < 30 mL/min and GFR ≥ 30 mL/min but < 60 mL/min.

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