• 구강회복응용과학지
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• 제35권4호
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• pp.235-243
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• 2019

골유착은 기능 하중을 받는 임플란트에 치조골이 직접적으로 접촉하는 역동적인 과정이라고 보고되었다. 골유착을 평가하기 위한 다양한 방법들이 시도되었고 그 중 골-임플란트 접촉 비율을 측정하는 방법이 가장 흔히 사용되고 있다. 골-임플란트 접촉 비율은 조직학적 분석을 통해서만 측정이 가능하지만 인간에서 성공적으로 골유착을 형성한 임플란트에 조직학적 분석을 시행한 연구는 많지 않다. 임플란트가 부적절한 위치에 식립되었거나, 식립 후 통증이나 감각 장애가 있는 경우, 임플란트 구조물이 파절된 경우와 같이 임플란트 제거가 필요한 경우에서만 골-임플란트 접촉 비율을 측정할 수 있기에 이는 매우 특별한 기회라고 할 수 있다. 본 증례에서는 3년간의 기능 하중을 받은 후 매식체 파절로 제거된 임플란트에서 조직학적 분석을 시행하였다. 조직 형태학적 연구 결과 임플란트 전체를 기준으로 골-임플란트 접촉 비율을 측정한 경우 대비 치조제 하부만 포함하여 골-임플란트 접촉 비율을 측정한 경우 각각 접촉 비율은 53.1%, 70.9%로 나타났다. 본 증례를 통해 비록 임플란트는 파절되었으나 생체 내에서 높은 수치의 골-임플란트 접촉 비율이 확인되었다.

• Archives of Plastic Surgery
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• 제33권5호
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• pp.592-600
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• 2006

Purpose: Numerous materials, both autologous and nonautologous, have been used for augmentation of sunken areas, but they have their own limitations. The purpose of this study is to determine the histologic response and volume change of the xenogenic collagen-based scaffold($Terudermis^{(R)}$) to the transfer into a subcutaneous soft tissue location in vivo rabbit model. Methods: Eighteen New Zealand white rabbits were used. Three $1.2{\times}1.2cm$ sized subcutaneous pockets were created on the dorsal surface of each ear. $1{\times}1cm$ sized collagen matrix($Terudermis^{(R)}$) and autologous dermal graft were implanted into each pocket. Full thickness of ear was harvested in 3 days, 1, 2, 4 weeks, 3, 6 months after implantation. Results: Histological analysis of implants demonstrated progressive neovascularization, fibroblast infilteration, neocollagen bundle synthesis and organization, and few foreign body reaction. The thickness of the collagen matrix in 3 days after the operation was 87.69% of the thickness of the collagen matrix in wet state. Then it decreased to 30.17% in 6 months after the operation. The rate of decrease was similar at all points at the same time compared with autologous dermal graft. Conclusion: Our experimental study suggests that $Terudermis^{(R)}$ could be a safe material as an implant for permanent augmentation in subcutaneous tissue. However the choice of graft for augmentation should be remained to the clinical situations.

• Asian Pacific Journal of Cancer Prevention
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• 제15권18호
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• pp.7885-7889
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• 2014

Background: Activating mutations of epidermal growth factor receptor (EGFR) could predict response to tyrosine kinase inhibitor (TKI) treatment in patients with non-small cell lung cancer (NSCLC). However, the detection of EGFR mutation is frequently challenging in clinical practice for the lack of tumor tissue. The aim of this study was to investigate the feasibility of performing EGFR mutation testing on various types of liquid-based cytology (LBC) samples. Materials and Methods: A total of 434 liquid-based cytology samples were collected from March 2010 and November 2013. Among them, 101 with diagnosis of lung adenocarcinoma had paired surgically resected specimens. The ADx Amplification Refractory Mutation System (ADx-ARMS) was used to determine EGFR mutation status both in LBC and resected samples. Results: All liquid-based cytology samples were adequate for EGFR mutation analysis. The mutation rate was 50.5% in the 434 NSCLC patients with LBC samples and the incidence rates of EGFR mutation were consistent among different specimens. We also detected EGFR positives in 52.5% (53/101) patients with paired histologic specimens. The concordance rate of EGFR mutation between LBC samples and paired histologic specimens was 92.1%. Conclusions: Our results suggest that liquid-based cytology samples are highly reliable for EGFR mutation testing in patients with NSCLC.

• Asian Pacific Journal of Cancer Prevention
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• 제15권8호
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• pp.3741-3745
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• 2014

Background: Emerging evidence implicates the platelet-derived growth factor-D (PDGF-D) in many types of human solid tumors. We investigated whether PDGF-D plays an important role in endometrial cancer (EC) in relation to clinicopathologic phenotype, angiogenesis, and patient prognosis. Materials and Methods: We analyzed PDGF-D protein expression by Western blotting in twenty-seven human endometrial cancer tissues, and matched normal endometrial controls collected at the third Affiliated hospital of Sun Yat-sen University during 2012-2013 (n=27). Immunohistochemical staining was performed using a human PDGF-D antibody on the endometrial cancer patients collected in the same facility during January 2001 and October 2013 (n=152). Patients were followed from the time of primary surgery in 2001-2013 until death or last follow-up. We correlated the PDGF-D expression levels with clinicopathologic parameters and prognosis in human endometrial cancer patients. Results: Compared with matched normal endometrial cases, PDGF-D was up-regulated in endometrial cancer. Expression of PDGF-D protein, found in 78% of the cases, was associated with nonendometrioid histologic type (p=0.028), FIGO stage III/IV (p=0.039), >50% solid tumor growth (p=0.048), pelvic LN metastasis (p=0.035) and ER and PR negativity (p=0.04 and 0.002). PDGF-D expression was also significantly associated with expression of VEGF-A (p=0.021). In multivariate analysis, PDGF-D expression proved to be an independent prognostic factor in addition to histologic grade and FIGO stage. Patients with high expression levels of PDGF-D had a significantly poorer overall survival rate compared with patients with no expression. Conclusions: PDGF-D expression is frequently up-regulated in endometrial cancer, and is associated with aggressive features and poor prognosis.

• Archives of Plastic Surgery
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• 제40권3호
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• pp.198-202
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• 2013

Background Marjolin's ulcer is known to present a high proportion of recurrence and poor prognosis compared to other kinds of skin cancer. Based on our experience, Marjolin's ulcer patients who have received reconstructive surgery present a higher proportion of recurrence when there was disturbed wound healing after surgery. The impact of disturbed wound healing after surgery on the prognosis was examined in this study. Methods A retrospective study was carried out on 26 patients who were diagnosed with Marjolin's ulcer and received surgery in this hospital from 1996 to 2011. Histologic grading, lymph node metastasis at diagnosis, and the wound healing process were evaluated and chi-squared analysis applied in order to determine the correlation with recurrence. Results The proportion of recurrence increases in patients with a low histologic grade or lymph node metastasis at diagnosis. The proportion of recurrence is even higher when the problem occurs during the wound healing process after surgery. Conclusions Disturbed wound healing after surgery could be used as a sign to quickly identify the recurrence of carcinoma. Therefore, in the event a problem occurs in the wound healing process after surgery, one should keep in mind that this could be a sign of the possibility of recurrence and proceed with careful observation and active diagnosis through additional physical examinations, general X-ray tests, computed tomographys, magnetic resonance imagings, and so on, to obtain an early diagnosis of recurrence.

• Childhood Kidney Diseases
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• 제11권2호
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• pp.152-160
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• 2007

목 적 : 이식신 생검은 이식신 기능 이상의 원인, 거부반응의 정도, 예후 등을 확인하는데 도움이 된다. 그러나 이식신의 조직학적 변화가 신피질에 고르게 분포하지 않는 경우를 흔히 보게 된다. 따라서 본 연구는 이러한 이식신 생검에서의 잠재적인 표본추출의 오류를 평가하기 위하여 시행되었다. 방법 : 569개의 이식신 생검 표본 중에서 Banff criteria에 준하는 급성 거부반응을 보이고 있으며, 신피막부터 수질까지의 전 층을 포함하고 있는 신생검 표본 26개를 조사하였다. Banff criteria를 변형하여 조직의 변화를 간질성 염증(0-3+), 부종(0-3+), 요세관간질염(0-3+)으로 구분하여 급성거부반응의 등급을 표면 피질, 깊은 피질과 피질에 근접한 수질층 각각을 비교하여 조직학적 분석을 시행하였다. 결과 : 간질성 염증(P=0.019), 부종(P=0.023), 요세관 거부등급(P=0.019)에서 깊은 피질에서 표면 피질에 비해 급성 거부반응의 정도가 심하였다. 결론 : 이식신의 급성 거부반응을 진단하기 위하여 신생검을 실시 할 경우 깊은 피질이 포함되지 않으면 급성 거부반응을 과소 평가 할 수 있으므로 주의해야 할 것으로 사료된다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제32권1호
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• pp.27-35
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• 2006

Purpose: This study was performed to investigate the expression of the transforming growth factor (TGF)-1, in a rat calvarium defect model using particulate dentin and/or plaster of Paris, and correlate the bone regeneration process with the histologic events. Materials and Methods: Thirty-two Sprague-Dawley rats were divided into 4 groups of 8 animals each. A 1.0 cm-sized calvarial defects were made and the defect was filled with different graft materials as follows : Group A, the defects were filled with a mixture of particulate dentin and plaster of Paris with a 2:1 ratio; Group B, the defects were filled with plaster of Paris only; Group C, defects were filled with particulate dentin only; Group D, untreated control group. The animals were sacrificed by 1, 2, 4, 8 weeks after implantation. Excised wound tissues were processed for histology, immunohistochemistry and RT-PCR for the analysis of TGF-1 expression. Results: Gene expression of TGF-1 was detected for all experimental groups. The highest gene expression was observed in the specimen taken at the first week after implantation in Group A. According to the histologic and immunohistochemical studies, TGF-1 positive osteoblast-like cells were found in the early stage of healing after the implantation of particulate dentin and plaster of Paris. Conclusion: These findings suggest that TGF-1 may be related to new bone formation at the early healing process after the implantation of particulate dentin and plaster of Paris.

• Journal of Gastric Cancer
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• 제17권4호
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• pp.363-373
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• 2017

Purpose: The aims of this study were to evaluate the expression of the large tumor suppressor (LATS) genes LATS1 and LATS2 by immunohistochemical staining of gastric cancer, and to evaluate the clinicopathological significance of LATS expression and its correlation with overall survival (OS). Materials and Methods: LATS1 and LATS2 expression in a tissue microarray was detected by immunohistochemistry, using 264 gastric cancer specimens surgically resected between July 2006 and December 2009. Results: Low expression of LATS1 was significantly associated with more advanced American Joint Committee on Cancer (AJCC) stage (P=0.001) and T stage (P=0.032), lymph node (LN) metastasis (P=0.040), perineural invasion (P=0.042), poor histologic grade (P=0.007), and diffuse-type histology by the Lauren classification (P=0.033). Low expression of LATS2 was significantly correlated with older age (${\geq}65$, P=0.027), more advanced AJCC stage (P=0.001) and T stage (P=0.001), LN metastasis (P=0.004), perineural invasion (P=0.004), poor histologic grade (P<0.001), and diffuse-type histology by the Lauren classification (P<0.001). Kaplan-Meier survival analysis revealed significantly poor OS rates in the groups with low LATS1 (P=0.037) and LATS2 (P=0.037) expression. Conclusions: Expression of LATS1 or LATS2 is a significant marker for a good prognosis in patients with gastric cancer.

• Advances in pediatric surgery
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• 제8권2호
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• pp.101-106
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• 2002

The antiangiogenic effects of novel agent KJ3, Betulinic acid, and Fumagillin on the neovascularization were studied by examining ultrastructural alterations in the vasculature of synthetic gelform and mouse neuroblastoma C1300. Small pieces of gelform with 0.4% agar were introduced subcutaneously (s.c.) in 7 week old male CH3/HeJ mice. After the $LD_{50}s$ were determined by FACS analysis, a third of $LD_{50}$ of three drugs were injected either locally or intraperitoneally every other day for 14 days. A/J mice were inoculated s.c. with the C1300 neuroblastoma cell line, then either saline or three drugs were injected in the same manner. The antiangiogenic effects of three drugs were studied by measuring the histologic changes in tumors, and immunostaining for CD34, VIII/vWF, CD105, and thymidine phosphorylase. In the drug treated groups, the number of vessels in gelform experiments and C1300 neuroblastoma experiments were lower than the corresponding values in the control. The histologic findings were significantly different in drug treated groups on day 7, but these were not significant on day 14. These results imply that antiangiogenic agents were effective when the tumor burden is minimal.

• Journal of Periodontal and Implant Science
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• 제36권2호
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• pp.289-303
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• 2006

This study was performed to evaluate the effect of bone graft materials including demineralized freeze-dried bone, freeze-dried bone, deproteinized bovine bone on space-making capacity and bone formation in guided bone regeneration with titanium reinforced ePTFE membrane(TR-ePTFE). Adult male rabbits(mean BW 2kg) were used in this study. Intramarrow penetration defects were surgically created with round bur on calvaria of rabbits. TR-ePTFE membrane was adapted to calvarial defect and bone graft materials were placed. Animals were sacrificed at 2, 8, 12 weeks after surgery. Non-decalcified specimens were processed for histologic analysis and prepared with Villaneuva bone stain. The results of this study were as follows: 1. TR-ePTFE membrane was biocompatible and capable of maintaining the space-making. 2. Tissue integration was not good at TR-ePTFE membrane. Fixation was not enough. so, wound stabilization was not good. 3. In animals using deproteinized bovine bone, demineralized freeze-dried bone, bone formation was little. 4. In animals using freeze-dried bone, bone formation was better. Within the above results, bone formation may be inhibited when wound stabilizafion was not good.