Publications by authors named "Seungsam Paik"

Breast cancer is a major global health burden with high morbidity and mortality rates. Previous studies have reported that increased expression of ASAP1 is associated with poor prognosis in various types of cancer. This study was conducted on 452 breast cancer patients who underwent surgery at Hanyang University Hospital, Seoul, South Korea.

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Background: Cortactin is overexpressed in several types of invasive cancers. However, the role of cortactin expression in breast cancer prognosis has not been sufficiently elucidated. Therefore, we investigated the clinicopathological significance of cortactin in breast cancer.

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Single-stranded DNA binding protein 2 (SSBP2) is a tumor suppressor candidate. In this study, the expression level and clinicopathological significance of SSBP2 in squamous cell carcinoma (SCC) and basal cell carcinoma (BCC) were evaluated. We also identified biological pathways associated with a set of genes potentially related to SSBP2.

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Article Synopsis
  • CADM4 is identified as a tumor-suppressor candidate that is involved in cell interactions, and its role in gallbladder cancer (GBC) was evaluated in this study.
  • Low levels of CADM4 expression were linked to more advanced stages of cancer and worse prognosis, indicating its potential significance in the aggressiveness of GBC.
  • The findings suggest that CADM4 expression may serve as an important prognostic marker for patient outcomes in gallbladder cancer.
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Introduction: Microtubule-associated tumor suppressor 1 (MTUS1) is a novel tumor suppressor protein involved in cell proliferation, migration, and tumor growth. MTUS1 is thought to be downregulated in various human cancers and associated with poor prognosis. We evaluated the clinicopathologic significance and prognostic value of MTUS1 in colorectal adenocarcinoma.

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Article Synopsis
  • CD47 acts as a 'do not eat me' signal that prevents macrophages from engulfing tumor cells, making it a target for immune checkpoint therapy currently being studied in various cancers.
  • In a study of 235 clear cell renal cell carcinoma (ccRCC) tissues, CD47 expression was found in 11.9% of cases and correlated with more aggressive tumor features, including higher grades and stages.
  • Positive CD47 expression was linked to poorer cancer-specific survival, although it did not impact recurrence-free survival rates.
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  • ASAP1, a protein linked to cancer, is found to be expressed more in various cancers, particularly in hepatocellular carcinoma (HCC), suggesting its potential as a prognostic marker.
  • In a study of 149 HCC tissue samples, high expression of ASAP1 was linked to male gender, advanced tumor grade, vessel invasion, and higher cancer stages.
  • Increased ASAP1 expression correlated with poorer overall survival and recurrence-free survival in HCC patients, indicating it could serve as a significant prognostic biomarker for this type of cancer.
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CD47 is a cell surface molecule and regulates diverse cellular responses. CD47 is highly expressed in cancer cells and has potential as a therapeutic target and prognostic factor in cancer patients. The expression patterns of CD47 in basal cell carcinoma (BCC), squamous cell carcinoma (SCC) and its precursor lesions, and its clinicopathological significance were investigated.

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Cell adhesion molecule 4 (CADM4) is a novel tumor suppressor candidate. The prognostic implications of CADM4 in gastric cancer have not been conclusively elucidated. Therefore, we evaluated the clinicopathological significance and prognostic value of CADM4 expression in a large series of patients with gastric adenocarcinoma.

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We investigated the clinicopathologic significance of extranodal tumor extension (ENTE) in locally advanced and prognostically inhomogeneous pT3 (pathologic T3) colorectal adenocarcinomas with regional lymph node metastasis. ENTE is defined as an interruption of the nodal capsule by tumor cells with extranodal growth. ENTE was observed in 46.

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Genomic reprogramming factors in the cytoplasm of germinal vesicle (GV) stage oocytes have been shown to improve the efficiency of producing cloned mouse offspring through the exposure of nuclei to a GV cytoplasmic extract prior to somatic cell nuclear transfer (SCNT) to enucleated oocytes. Here, we developed an extract of GV stage pig oocytes (GVcyto-extract) to investigate epigenetic reprogramming events in treated somatic cell nuclei. This extract induced differentiation-associated changes in fibroblasts, resulting in cells that exhibit pluripotent stem cell-like characteristics and that redifferentiate into three primary germ cell layers both in vivo and in vitro.

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Background: Somatic cell nuclear transfer (scNT)-derived piglets have high rates of mortality, including stillbirth and postnatal death. Here, we examined severe malformed umbilical cords (MUC), as well as other organs, from nine scNT-derived term piglets.

Results: Microscopic analysis revealed complete occlusive thrombi and the absence of columnar epithelial layers in MUC (scNT-MUC) derived from scNT piglets.

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Aim: To verify that CD markers are available for detecting cancer stem cell populations and to evaluate their clinical significance in colon cancer.

Methods: Immunohistochemistry for CD133, CD24 and CD44 was performed on the tissue microarray of 523 colorectal adenocarcinomas. Medical records were reviewed and clinicopathological analysis was performed.

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Background: Malignant peripheral nerve sheath tumors, infrequent sarcomas arising within a peripheral nerve, mostly metastasize to the lung at terminal stage of disease. However, metastasis to the brain without pulmonary involvement is quite unlikely to occur.

Case Description: A 21-year-old man was brought in the emergency department due to sudden unconsciousness, and imaging studies showed huge intracerebral hemorrhage.

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Somatic cell-derived nuclear transfer (scNT) is a method of animal cloning in which the oocyte reprograms a somatic cell nucleus to divide and execute developmental programs. Despite many successes in this field, cloning by scNT remains very inefficient. Unlike other cloned animals, pigs derived by scNT have placentas with severe villous hypoplasia.

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Tailgut cyst is a rare congenital cystic lesion arising from the remnants of the embryonic postanal gut. It occurs exclusively within the retrorectal space and rarely in the perirenal area or in the subcutaneous tissue. A prerectal and retrovesical location of tailgut cyst is extremely rare.

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A 34-year old man with a past history of hepatocellular carcinoma (HCC) complained of headache and visual disturbance. Neuroimaging revealed a right occipital haematoma with rim enhancement and at operation, a metastasis from the primary malignancy was found. Five months after surgery and subsequent adjuvant therapy, he presented with blindness.

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In this study, we generated 40 somatic cell cloned (scNT) piglets. Of these, five piglets were stillborn, 22 scNT piglets died suddenly within the first week of life, and 1 piglet died after 40 days. Twelve scNT piglets are still healthy.

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We report a rare case of skull metastasis from ampulla of Vater adenocarcinoma in a patient with controlled primary neoplasm. This 65-year-old Korean man presented with headache and painful parietal scalp swelling, but he did not show any neurological deficits. Computed tomography revealed an osteolytic mass that invaded and expanded through the skull tables in full-thickness.

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