Sang Hyuk Lee

Accumulating evidence suggests that a distinct subpopulation of cancer stem cells (CSCs) is responsible for tumour initiation and progression in head and neck squamous cell carcinoma (HNSCC). Wnt/β-catenin signalling is essential for stem cell regulation and tumourigenesis, but its molecular mechanism in HNSCC CSCs remains unknown. We investigated whether Wnt/β-catenin signalling regulates self-renewal and tumourigenicity of HNSCC stem-like cells in vitro and in vivo. Cytoplasmic/nuclear β-caten

OBJECTIVE: This study was conducted to identify anatomical variations of the spinal accessory nerve (SAN) in the upper neck, the landmark of the anterior and inferior border of level IIb, and to evaluate the nerve's effect on the border and the number of lymph nodes (LNs) in level IIb. STUDY DESIGN AND SETTING: Case series with planned data collection. SUBJECTS AND METHODS: A total of 181 neck dissections (NDs) were prospectively enrolled in this study. The relation between the SAN and adjacent

In comparison with the right vocal folds, there was significantly less granulation tissue in the hADSCs-injected left vocal folds (p < 0.05). Histological examination revealed excessive collagen deposition and perichondral fibrosis in the right vocal folds, whereas the left vocal folds exhibited better wound healing and less collagen deposition (p < 0.05). Among the 12 specimens injected with hADSCs, 4 specimens demonstrated viable hADSCs under immunofluorescent cytochemistry.

OBJECTIVE: To evaluate the expression of cell-cycle regulators in papillary thyroid carcinoma in relation to lymph node metastatic features, and to determine whether immunohistochemical staining of cell-cycle markers can predict lymph node metastasis. STUDY DESIGN: Cross-sectional study of prior surgical specimens. SETTING: Academic tertiary referral center. SUBJECTS AND METHODS: We reviewed the clinical records of patients who had undergone surgery for thyroid cancer and follicular adenoma betw

Emerging evidence suggests that cancer cells present profound epigenetic alterations in addition to featuring classic genetic mutations. Valproic acid (VPA), a histone deacetylase inhibitor, can potently inhibit tumor growth and induce differentiation. However, the effect and underlying mechanism of VPA on head and neck squamous cell carcinoma (HNSCC) cancer stem cells (CSCs) remain unclear. In the present study we investigated the effects of VPA on the characteristics of HNSCC CSCs in vitro and

Objectives. To investigate the relationships between lymph node metastasis (LNM) and expression of CD31, D2-40 and vascular endothelial growth factors (VEGF)-A and -C in patients with papillary thyroid cancer (PTC). Methods. Paraffin-embedded thyroid tissues of 72 patients were evaluated, which included 25 patients with thyroid nodular hyperplasia (TNH), 24 PTC patients without LNM, and 23 PTC patients with LNM. Three pathologists, who were blinded to the patient’s clinical information, assessed

OBJECTIVES: Currently, a variety of materials are available for the treatment of glottal insufficiency. Ideal injection materials should be inexpensive, easily obtainable, nontoxic, and biocompatible. Plasma gel has recently been developed as an injectable, autologous material used in plastic surgery. The aim of this study was to evaluate the histological changes in rabbit vocal folds (VFs) after an injection of plasma gel, compared with collagen (Artecoll) or hyaluronic acid (Reviderm Intra). S

BACKGROUND: Salivary gland neoplasms are relatively rare and comprise only 1%-4% of all human neoplasms. Salivary gland neoplasms also show an extremely wide range of morphological diversity. Currently, the genetic alterations and corresponding molecular mechanisms underlying salivary gland neoplasms development remain largely unknown. METHOD: We generated an inducible Tet-MAP3K8::MMTV-rTA mouse model by crossing the MAP3K8 transgenic mice with MMTR-rTA transgenic mice to express MAP3K8 in the s

Background: We primarily investigated the prognostic role of CDKN2A homozygous deletion in CNS WHO grade 4 gliomas. Additionally, we plan to examine traditional prognostic factors for grade 4 gliomas and validate the findings. Materials: We conducted a retrospective analysis of the glioma cohorts at our institute. We reviewed medical records spanning a 15-year period and examined pathological slides for an updated diagnosis according to the 2021 WHO classification of CNS tumors. We examined the

Alteration of apoptosis is related with progression and recurrence of atypical meningiomas (AMs). However, no comprehensive study has been conducted regarding histone modification regulating apoptosis in AMs. This study aimed to determine the prognostic values of certain apoptosis-associated factors, and examine the role of histone modification on apoptosis in AMs. The medical records of 67 patients with AMs, as diagnosed during recent 13 yr, were reviewed retrospectively. Immunohistochemical st

Benign vocal fold lesions, such as vocal nodules, polyps and Reinke's edema, usually result from chronic voice overuse. Conservative management such as voice therapy and pharmacotherapy are used as the primary treatment techniques. The main purpose of voice therapy is to identify and reduce voice misuse to achieve the optimal voice. But complete resolution may not be possible in all patients after voice therapy. Furthermore, some patients with voice-related occupations, voice rest and voice ther