Publications by authors named "Seung-Kwon Koh"

Article Synopsis
  • Anti-CD19 CAR-engineered T and NK cell therapies have improved treatment for B cell malignancies, but issues like CD19 antigen loss limit effectiveness.
  • Co-administering an anti-CD19 monoclonal antibody boosts the antitumor activity of CAR-T and CAR-NK cells, despite the antibody interfering with CAR binding to the CD19 antigen.
  • This combination therapy alters T cell activation over time, enhancing the effectiveness of CAR cells in killing tumor cells and improving overall treatment outcomes in vivo.
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Intravesical treatment using either reovirus or natural killer (NK) cells serves as an efficient strategy for the treatment of bladder cancer cells (BCCs); however, corresponding monotherapies have often shown modest cytotoxicity. The potential of a locoregional combination using high-dose reovirus and NK cell therapy in an intravesical approach has not yet been studied. In this study, we evaluated the effectiveness of reoviruses and expanded NK cells (eNK) as potential strategies for the treatment of bladder cancer.

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Adaptive natural killer (NK) cells expressing self-specific inhibitory killer-cell immunoglobulin-like receptors (KIRs) can be expanded in vivo in response to human cytomegalovirus (HCMV) infection. Developing a method to preferentially expand this subset is essential for effective targeting of allogeneic cancer cells. A previous study developed an in vitro method to generate single KIR+ NK cells for enhanced targeting of the primary acute lymphoblastic leukemia cells; however, the expansion rate was quite low.

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Article Synopsis
  • The study explores the use of umbilical cord blood-derived natural killer (NK) cells in adoptive cell therapy, highlighting the need for better culture methods due to low NK cell availability and limited UCB volume.
  • Researchers tested different culture media and human serum supplementation to determine their effects on NK cell expansion and function.
  • Results showed that while human serum can enhance NK cell growth, it can also slow down their ability to recognize and kill target cells, emphasizing the importance of carefully choosing culture media to optimize both quantity and quality of NK cells for therapy.
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Recent advances in anticancer therapy have shown dramatic improvements in clinical outcomes, and adoptive cell therapy has emerged as a type of immunotherapy that can modulate immune responses by transferring engineered immune cells. However, a small percentage of responders and their toxicity remain as challenges. Three-dimensional (3D) models of the tumor microenvironment (TME) have the potential to provide a platform for assessing and predicting responses to therapy.

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Objective: This study was conducted to assess the relative significance of the amplitude versus the duration of accelerations in non-stress test (NST) analysis.

Materials And Methods: A total of 3055 normal fetal heart rate (FHR) tracings at 30-42 weeks' gestation were analyzed by automated FHR analyzing software. Accelerations were classified as one of four combinations of amplitude and duration: 15 bpm-15 seconds (Acc15-15), 15 bpm-10 seconds (Acc15-10), 10 bpm-15 seconds (Acc10-15) and 10 bpm-10 seconds (Acc10-10).

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Objective: To compare the test duration times and rate of nonreactive results between the conventional linear reactive criteria (CLRC) and the modified nonlinear reactive criteria (MNRC) in electronic fetal heart rate (FHR) monitoring. The MNRC are the CLRC with the addition of approximate entropy or sample entropy.

Methods: One thousand women with singleton pregnancies between 30 and 37 weeks' gestation were selected.

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Aims: To shorten the analysis time needed for non-stress testing (NST) without decreasing efficacy in compromised fetuses.

Methods: We selected 80 cases with a 5-min Apgar score <7 as a study group and 259 cases with a 5-min Apgar score >/=9 as a control group. We applied four different criteria (A, B, C, and D) to each study and control group for the first 20-min window of NST data to evaluate reactivity.

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Although umbilical cord blood is increasingly being used in allogeneic marrow transplantation, delayed platelet engraftment is often a concern for cord blood transplant recipients. We evaluated the potential of ex vivo expansion and clonality in CD34+ cells separated from a bone marrow source, and cord blood, in a serum-free Media. The CD34+ cells, selected from bone marrow (BM) and umbilical cord blood (CB), were expanded with hematopoietic growth factors.

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