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Objective:To investigate the effects of Rad50-targeted inhibition on the radiosensitivity of head and neck squamous cell carcinoma cells.Methods:Rad50 in Tca8113 and OSCC-15 cells was down-regulated by siRNA.Then the cells were treated by a small dose of radiation(2 Gy),Western blot was used to detect the expression of Rad50 protein.Comet assay was used to evaluate the DNA double strand breaks(DSBs).Colony survival assay was performed to detect the survival rate of the cells.Telomere FISH was performed to assess the telomere length in the cells.Results:Target siRNA inhibited Rad50 protein expression in Tca8113 and OSCC-15 cells. siRNA combined with the radiation of 2 Gy produced more DSBs,decreased the proliferation and shortened the nucleus telomere length of the cells more than radiation treatment alone.Conclusion:The targeted inhibition of Rad50 may increase the radiosensitivity of Tca8113 and OSCC-15 cells.
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OBJECTIVE To study the effect of K252a on the chemotactic growth of Schwann Cell to salivary adenoid cystic carcinoma cell in vitro co-culture METHODS Co-culture of sciatic nerve blocked by K252a with salivary adenoid cystic carcinoma cell was regarded as experimental group. Co-culture of sciatic nerve with salivary adenoid cystic carcinoma cell was chosen as control group RESULTS In contrast to control group , the promotion growth and chemotactic growth of Schwann cell was blocked by K252a (P
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<p><b>OBJECTIVE</b>To study the clinical effects of demineralized dentin matrix (DDM) as a apexificating agent.</p><p><b>METHODS</b>Human teeth were crushed into fragments and were deflated, demineralized, lyophilized to produce DDM. The DDM was used as an apexificating agent to treat 57 teeth compared with calcium hydroxide. X-ray film and clinical observation were undertaken after half a year, one year and two years.</p><p><b>RESULTS</b>One year later, a barrier in the tooth apex was found in the X-rays film. Then permanent filling material was used. After two years, DDM group had a healing rate of 92.86%, was higher than that of 91.30% in calcium hydroxide group, but there were no statistical significance.</p><p><b>CONCLUSION</b>The findings suggest that DDM can be used as a new apexificating agent. One year after the apexification is the best opportunity to change the apexificating agent to a permanent root canal filling material.</p>
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Adolescent , Adult , Child , Humans , Dental Materials , Therapeutic Uses , Dental Pulp Necrosis , Therapeutics , Dentin , Root Canal Filling Materials , Therapeutic Uses , Root Canal Therapy , Methods , Tooth Apex , Tooth RootABSTRACT
<p><b>OBJECTIVE</b>To study the clinico pathologic factors influencing postoperative survival rate in mucoepidermoid carcinoma of salivary glands.</p><p><b>METHODS</b>A retrospective study of seventy patients with mucoepidermoid carcinoma of salivary glands has been carried out. All cases underwent primary surgical resection in our hospital were followed up and clinicopathologic factors influencing the postoperative survival rate of patients were investigated. Statistical analysis was conducted using a computer program (SPSS). The data were statistically treated according to the Kaplan-Meier method. The Log rank tests were employed to assess the statistical significance of various groups.</p><p><b>RESULTS</b>The 3-, 5- and 10-year overall survival rate were 90.66%, 88.85% and 86.63%, respectively. The patients with tumors' diameter less than 4 cm, early clinical stage (stage I and II), well differentiated tumor cells, without lymph nodes involvement, without local recurrence and metastasis after primary surgical resection had a long survival term. The patients with tumors' diameter more than 4 cm, with lymph nodes involvement, advanced clinical stage (stage III and IV), poor differentiated, with local recurrence and metastasis after primary surgical resection demonstrated a short survival term.</p><p><b>CONCLUSION</b>TNM and clinical stage, the degree of differentiation, with or without local recurrence and metastasis after primary surgical resection are the important factors influencing the postoperative survival time.</p>
Subject(s)
Adolescent , Adult , Aged , Aged, 80 and over , Child , Female , Humans , Male , Middle Aged , Carcinoma, Mucoepidermoid , Pathology , General Surgery , Follow-Up Studies , Neoplasm Recurrence, Local , Postoperative Period , Retrospective Studies , Salivary Gland Neoplasms , Pathology , General Surgery , Survival RateABSTRACT
Objective:To study the effects of hydroxycamptothecine(HC PT ) and pingyangmycin(PYM) alone or in combination(HCPT/PYM) on the proliferation and telomerase activity of human tongue carcinoma Tca 8113 cells.Methods :The growth inhibitary effects of HCPT or PYM on Tca 8113 cells were stu died by MTT assay and the IC 30 values of the two drugs were obtained. Then the cells were exposed to HCPT or PYM at IC 30 , or to their combination. T he clonogenecity, cell cycle distribution, morphological change and telomerase a ctivity were studied by clonogenic assay, flow cytometry,transmision electron mi croscopy and telomeric repeat amplification protocol (TRAP) respectively.Results:IC 30 (ng/ml) of HCPT and PYM was 109 and 416 respectivel y, when in combination(HCPT/PYM) the IC 30 of HCPT and PYM was 35 and 100 r espectively. The clonogenecity(%) of the control, HCPT,PYM and HCPT/PYM treated cells was 31.7,11.6,15.2 and 4.1 respectively. PYM decreased S and G 2 phase ce lls,increased G 1 phase cells.HCPT or HCPT/PYM decreased G 1 phase cells and i ncreased S and G 2 phase cells.Drug treatment resulted in cell organ degenerati on and decrese of telomerase activity.The A value at A 450 of telomerase in control,HCPT,PYM and HCPT/PYM treated cells was 1.89?0.03,0.82?0.02,0.77?0.0 2 and 0.53?0.02 respectively(P
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objective: To study the effects of hydroxycampothecin(HCPT), pingyangmycin(PYM), cis platinum (DDP) or their combination on the proliferation of human tongue carcinoma Tca8113 cells. Methods: MTT assay, cell counting,clonogenic assay and HE staining were used to study the effects of HCPT, PYM, DDP or their combination on the proliferation of human tongue carcinoma Tca8113 cells. Results: ①Synergistic inhibiton was observed when HCPT at the concentration (ng/ml) of 10～100 combined with PYM at 32～320 or DDP at 32～320, antagonistic effect was observed when PYM at 32～320 combined with DDP at 32～320; ②After treatment with PYM, HCPT or PYM plus HCPT at IC 30 the clonogenecity (%) of the cells was 15.2, 11.6 and 4.1 respectively, while that of untreated cells 31.7. Conclusion: The combination of HCPT with PYM may be synergistic in the inhibition of tongue carcinoma cell proliferation.
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Objective:To summarize the experience in clinical diagno sis of lymphonode reactive hyperplasia (LRH). Methonds: 39 cases with the final pathological diagnosis of lymphonode reactive hyperplasia were retrospectively reviewed.Results: 39 patients had th e incidence at the age of 7～61 years old and the medical history of 14 days ～8 years.The patients consulted doctors because of unilateral or bilateral painles s masses in the superior neck and low fever.32 of them underwent repeated antib iotics treatment.On admission 9 cases were diagnosed with lymphoma,6 tuberculos is,6 inflammation of lymph node and 18 were without identified diagnosis.The f inal pathological diagnoses of all the 39 cases was LRH.Antibiotic treatment wa s effective in the patients.Conclusion:LRH was usually mis diagnosed as other diseases.Swelling of lymph nodes in superior neck with low fe ver is the main symptom of LRH.
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Objective: To investigate the effect of open-mouth jaw plate in the treatment of condylar fracture in children. Method: Open-mouth plates in the height of 2～3 cm were respectively made in op e n-mouth position for 12 children aged 3～6 years old with condylar fractures an d used by the children with the help of doctors or parents for 3～6 months.Follo w -up was carried out by clinical observation and X-ray radiograph.Re sults: Satisfactory results were obtained in all the patients examine d by clinical observation and X-ray radiograph. Conclusion: The method of open-mouth plate is effective in the treatment of condylar f racture in children.
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Objective: To sammarize the methodology of the treatment of alveolar cleft by autogenous cancellous bone graft obtained with mini incision(ABGM).Methods: 22 cases of alveolar cleft received ABGM by one operator. The cleft area was restored with autogenous cancellous bone from iliac crest by cylinder osteotomes for extraction of bone transplants(COEBT) with mini incision. All the patients were follow up for at least six months postoperatively. The result of the bone grafting was evaluated on the radiographs. Results: ①The overall survival rate of ABGM was 95.8%,and clinical successful rate was 91.7%;②The successful rate of ABGM in group of patients above 18 year old, or with complete cleft palate or bilateral cleft lip and palate was lower than that in other groups.③The wound for extracting autogenous cancellous bone from iliac crest by COEBT with mini incision was smaller than that by osteotomy. Conclusion: ABGM with COEBT is an effective way in the treatment of alveolar cleft. The successful rate of ABGM is related with the age and cleft style of the patients.
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Objective: To study the expressien and heterogeneity of epidenmoid growth factor receptor(EGFR) in human mucoepidermoid carcinoma MEC 1 cells. Methods: EGFR1 McAb (MaH) immunofluorescent stain and flowcytometer (FCM) were used to detect the positive percentage and heterogeneity of EGFR expression in MEC 1 cells. Results: Positive expression of EGFR was found in 100% of MEC 1 cells. Average peak channel of relative fluorescent intensity was 8.006?4.410. Double peaks of MEC 1 cells from single parameter histogram was observed with FCM. Conclusion: All MEC 1 cells express EGFR and there are heterogeneous cell populations of EGFR expression in MEC 1 cell line.
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Objective: To evaluate the effect of concomitant chemoradiotherapy for the prevention of recurrence and metastasis of postoperative salivary adenoid cystic carcinoma(SACC).Methods: 14 cases of salivary adenoid cystic carcinoma after operation were treated with concomitant chemoradiotherapy. Regular radiotherapy of 60 Gy and chemotherapy with hydroxycamptothecin (HCPT) at 10 mg/m 2 , 3 times a week, were administered. HCPT was given in 1st, 2nd, 4th and 5th week. Recurrence and metastasis of SACC after operation were observed using CT, MRI, ultrasonography and X ray. Results: After 3～17 months' follow up, relapse free survival was 100%. No recurrence and metastasis of SACC after operation were found. Adverse reactions of the chemotherapy were nausea, vomiting and leukopenia. After suspended in a short time and using ondansetron and /or G CSF the chemotherapy of HCPT was continued and completed. Conclusion: concomitant chemoradiotherapy of HCPT and radiotherapy can prevent recurrence and metastasis of SACC after operation. The efficacy of long term needs further observation.
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objective: To investigate the expression of Schwann cell marker S100 protein in salivary adenoid cystic carcinoma and try to find out the correlation of S100 expression and neural invasion of the tumor. Methods: Samples from 20 cases of adenoid cystic carcinoma(ACC) and 18 cases of mucoepidermoid carcinoma(MEC) were immunohistochemical stained with S100 antibody. Results: S100 was positive in all of the samples of the 20 cases of ACC and negative in all of MEC. Neural invasion was observed in 11 out of the 20 cases of ACC and in 2 of MEC. Conclusion: There may be Schwann cell differentiation in salivary adenoid cystic carcinoma, and it may be the histologic base of neural invasion of the tumor.