Objective: To further investigate the molecular mechanism of photodynamic therapy. Methods: We used cDNA microarray technique to explore the gene expression profiles of HEPG2 cells after photodynamic therapy with hematoperphyrin monomethyl ether(HMME) in HEPG2 cells. After treated with HMME for 60 min, the HEPG2 cells were irradiated with laser, and observed by microscope with H E staining. To prepare the probes, mRNA from both control and treated cells were isolated and purified, then reversely transcribed to cDNA with the incorporation of fluorecent labeled dUTP. The probes were hybridized with a cDNA microarray representing the 1 538 genes originated from human hepatocarcinoma cells. The fluorencent signals of Cy3 and Cy5 were scanned and analyzed. Results: After laser irradiation, the HEPG2 cells showed the typical feature of apoptosis. The gene expression profiles were also changed greatly. Among the 1 538 target genes, 389(2.47%) different expression genes were detected. Most of the changed genes (nearly 80%) were down regulated. They were functionally related to cell proliferation cycle, replication, metabolism and so on. Several apoptosis associated genes were detected among those up regulated genes, encoding the key proteins involved in apoptosis signal transduction, such as CCP32,AIF,Mch2. Conclusion: The HMME photodynamic therapy can initiate the apoptosis process of HEPG2 cells, which may be regulated by mitochondial pathway.[

Objective To detect the activity of transglutaminase1(TGM1)and gene mutation in a family with lamellar ichthyosis.Methods Immunohistochemistry technique was used to detect the activity of transglutaminase1.Complete encoding sequences of TGM1gene were analyzed in this family by using PCR-DNA sequencing.Results No activity of transglutaminase1was detected in the proband's skin.A nonsense mutation of C604T located in exon4of TGM1gene was identified by PCR-DNA sequencing,which caused a premature termination of Q202X and a defective polypeptide truncated by615amino acids in C-terminus.A heterozygous C604T mutation was carried by both of the proband' s parents.Conclusions The proband of lamellar ichthyosis in this family shows loss of transglutaminase1activity,which is resulted from a truncated transglutaminase1coded by the homozygous mutant TGM1gene.

Objective To study the perfusion imaging features of renal cell cancer(RCC) and their correlation with microvessel density(MVD) and vascular endothelial growth factor(VEGF) ex-pression status. Methods Dynamic contrast-enhanced multislice spiral CT was performed preopera-tively in 73 cases with histologically proven RCC (65 cases of clear cell carcinoma, 3 of papillary ade-nocarcinoma, and 5 of chromophobic carcinoma). Blood volume (BV), blood flow (BF), mean transit time (MTT), and permeability surface area product (PS) of tumors were recorded. MVD and VEGF expression status were studied by immunohistochemial staining. Results The mean BV, BF, MTT negative in 35 (47.9 %) cases, slightly positive in 24 (32.9 %) cases, moderate positive in 10 (13.7 %) cases, and intensively positive in 4 (5.5 %) cases. MVD of RCC was positively correlated with BV, BF and PS (P<0.01),and negatively correlated with MTT (P<0.05). No relationship was found be-tween the expression of VEGF and perfusion CT parameters. Conclusion Perfusion CT scan is use-ful to evaluate the angiogenesis status of RCC.

Objective To assess the relationship between fruit intake and gastric cancer.Methods Articles published during January 2001 and October 2012 that assessed the relationship between fruit intake and gastric cancer were searched on PubMed,Ovid and Willey database.Adjusted relative risk (RR) and 95％ confidence intervals (CI) were calculated by using fixed-effect or random-effect model.Variants of subgroup analysis included living regions,followup duration,and adjusted factors.Results A total of 3679 gastric cancer patients and 1 173 859 subjects from 7 prospective cohorts were included in this metaanalysis,and the pooled RR was 0.89 (95％ CI:0.78-1.01).In the subgroup analysis,the pooled RR in the 10-year followup group was 0.94 (95％ CI:0.85-0.99) before age,cigarette smoking and alcohol drinking were adjusted (RR =0.81,95％ CI:0.54-0.99).Conclusion Fruit intake may prevent the development of gastric cancer.

Objective To investigate α-interferon (α-IFN) and cyclooxygenase-2 (COX-2)inhibitor celecoxib synergistically inhibit the growth of human liver cancer SMMC-7721 cells xenografts and tumor angiogenesis in a nude mouse model.Methods The effects of celecoxib and α-interferon on tumor volumes and weight were observed.The expressions of VEGF and Cox-2 were determined by immunohistochemistry and RT-PCR,and the effect of α-interferon on MVD also was observed by immunohisto chemistry.Results During the period of observation tumor volume increased progressively in control group,while it was suppressed obviously in other drug treatment groups.The average tumor volume was significantly smaller in celecoxib + α-IFN group than that in IFN group,celecoxib group and control group (P ＜ 0.01,respectively),its inhibitory rate was 61.84％.Immunohistochemistry showes that the VEGF and MVD was significantly smaller in celecoxib + IFN group than that in α-IFN group,celecoxib group and control group (P ＜ 0.01,respectively).RT-PCR shows that the COX-2mRNA and VEGF mRNA pression was lower in the celecoxib + α-IFN group than in α-IFN group,celecoxib group and control group (P ＜ 0.01).Conclusions The COX-2 inhibitor celecoxib and α-interferon synergistically reduces xenografts growth of human liver cancer SMMC-7721 cells effectively via suppressing tumor growth and angiogenesis.

Objective: To evaluate the feasibility and effect of transcatheter closure of ventricular septal defects(VSD) using the VSD occluder.Methods: From December 2003 to March 2005,13 VSD patients,8 males and 5 females,ranging in age from 4 to 35(15.2?10.7)years,underwent catheter closure using the VSD occluder.Tthe mean diameter of the VSD obtained by transthoracic echocardiography was 4-12(5.4?1.2) mm.Transcatheter closure was performed under transthoracic echocardiographic guidance after left ventriculography.All patients were followed up 1,3 and 6 months after the procedures. Results: The devices were successfully placed in 12 of the patients and complete closure achieved in 11.Trace residual shunt was observed in 1 patient but disappeared within 10 minutes.No severe complications were noted except 1 case of complete right bundle branch block revealed by electrocardiography. Conclusion: Transcatheter closure of VSD by the VSD occluder is a safe and effective procedure,with good immediate results.Further clinical trials are under way to assess its long-term effect.

ObjectiveTo investigate clinical application of intraoperative intraperitoneal hyperthermic chemotherapy using sustained-release fluorouracil in radical gastrectomy for advanced gastric cancer.MethodsThe clinical data of 280 advanced gastric cancer patients admitted from September,2002 to September,2010 were analyzed retrospectively.They were divided into three groups randomly and followed up.The postoperative morbidity,the mortality and the overall survival rates were evaluated.ResultsThere were no significant differences in these three groups with respect to postoperative morbidity ( P ＞ 0.05 ).The incidence of recurrence in intraperitoneal chemotherapy using sustained-release fluorouracil ( treatment group) was significantly lower than those of intraperitoneal chemotherapy and operative treatment( 16.18％,37.61％ and 41.28％,P ＜0.05).The 1,3- and 5-year overall survival rates of treatment group were 85.51％,61.28％ and 53.67％,respectively,and the 1-,3- and 5-year overall survival rates were 84.11％,39.98％ and 28.12％,and 81.28％,29.88％ and 25.21％ respectively in intrapeitoneal chemotherapy group and operative group.1-year overall survival rate had no significant differences among three groups with respect to ( P＞0.05).3-and 5-year overall survival rates in treatment group were higher signfficantly than those of intraperitoneal chemotherapy and operative treatment( P＜0.05).Conclusions Intraoperative intrapeitoneal hyperthermic chemotherapy using sustained-release fluorouracil is a kind of convenient,safe,and highly effective comprehensive treatment method,and it can kill isolated intraperitoneal cancer cells.It may reduce postoperative recurrence and improve survival rates.

Objective To investigate the predictive value of depth of invasion (DOI) of tongue squamous cell carcinoma (TSCC) for cervical lymph node metastasis and prognosis. Methods We retrospectively analyzed the clinical and pathological data of 73 patients with T_1/2 TSCC. ROC curve was used to determine the optimal cut-off value of DOI for predicting cervical lymph node metastasis, and logistic regression analysis was performed to analyze the related factors affecting cervical lymph node metastasis of TSCC. Kaplan-Meier method and Cox regression analysis were used for survival analysis. Results Among 73 patients, 18 patients were with lymph node metastasis and 55 patients were without lymph node metastasis. The median DOI with and without lymph node metastasis were 8.00 and 5.00 mm, respectively (P=0.003). The optimal cut-off value for DOI was 6.15 mm, with AUC 0.75 (95%CI: 64.1%~87.1%, P=0.001), sensitivity 77.8% and specificity 63.6%. DOI and pathological differentiation were independent prognostic factors for cervical lymph node metastasis in multivariate analysis. DOI, nerve invasion and pathological differentiation were independent prognostic factors of survival in Cox regression analysis. Conclusion DOI of TSCC patients has important predictive value for both cervical lymph node metastasis and prognosis. Neck lymph node dissection is recommended for patients with DOI > 6.15 mm to improve survival rate and reduce recurrence rate.

Objective To obtain a better understaning of the clinical features of Castleman tumor associated paraneoplastic pemphigus. Methods The clinical features and therapy of 10 cases of this disease, diagnosed in the Department of Dermatology of Peking University First Hospital were analyzed. Results Castleman tumor was shown to be the most common neoplasm associated with paraneoplastic pemphigus in China. The clinical presentations, histopathologic characteristics, CT scan findings, and immunologic features were all unique. The early diagnosis and removal of the Castleman tumor are crucial for the treatment of this tumor-associated autoimmune disease. Conclusions Because Castleman tumor is directly related to the induction of autoimmunity, early diagnosis and prompt removal of the tumor are essential to the management of this disease.

Objective: To understand the occupational external exposure dose among radiation workers in a first-class hospital at Grade 3 of Suzhou, and to provide reference for radiological protection. Methods: The individual dose of 1156 radiation workers in the hospital from 2010 to 2017 were detected, the annual collective effective dose and per capita annual effective dose were analyzed for different years, different occupations (diagnostic radiology, radiotherapy, nuclear medicine, interventional radiology) , gender, and age. Results: From 2010 to 2017, the total annual collective effective dose was 351.40 person·mSv, the per capita annual dose was 0.30 mSv/a, and radiation workers whose annual effective dose was less than 1 mSv accounted for 94.98%. There were 5 interventional radiology workers and 1 nuclear medicine worker with annual effective dose between 2 and 4 mSv. There was no worker with annual effective dose over 4 mSv. The per capita annual effective dose of nuclear medicine workers was the highest (0.40 mSv/a) . The per capita annual effective dose was not significantly different between radiation workers with different genders and ages (P>0.05) . Conclusion Most of radiation workers have low individual dose level in the hospital. It is important to focus on nuclear medicine workers and interventional radiology workers.