Objective To evaluate laparoscopy assisted radio frequency ablation (LRFA) and percutaneous radiofrequency ablation ( PRFA ) for the treatment of hepatocellular carcinoma ( HCC ).Methods A total of 525 HCC patients were enrolled,including LRFA group of 78 cases with 106 tumor nodules,and PRFA group of 447 cases with 565 tumor nodules.Results ( 1 ) In LRFA group complete ablation rate was 97.17％ (103/106); in LRFA group complete ablation rate was 93.09％ (526/565)(x2 =2.523,P =0.112).(2)The 1,3,5 year overall survival rate was 96.15％,55.12％ and 38.46％in LRFA group and 93.73％,48.54％ and 31.54％ in PRFA group respectively ( x2 =0.699,1.151,1.447 ; P =0.403,0.283,0.229 ).The 1,3,5 year disease-free survival rate was 94.87％,43.58％ and 28.21％ in LRFA group and 93.73％,48.54％ and 31.54％ in PRFA group respectively (x2 =0.915,0.303,0.174; P=0.339,0.582,0.676).The average disease-free survival time was 22.25 months in LRFA group and 21.53 months in PRFA group respectively.(3)The serious complications was 0％ (0/78)in LRFA group and 1.34％ ( 6/447 ) in PRFA group respectively.( 4 ) Recurrence rate was 23.07％(18/78) in LRFA group,and 34.89％ (156/447) in PRFA group ( x2 =4.189,P =0.041 ).Conclusions The therapeutical effect of LRFA equals that of PRFA,while enjoying lower recurrence rate,no serious complications and higher treatment safety.

Objective The existing laryngoscope can not be used to observe the ultrastructure of cells.As a result,doctors always have to conduct biopsies on some patients who can not be diagnosed.The timeconsuming procedure of biopsy may be detrimental to the timely diagnosis and treatment.To solve this problem,we aimed to design the integrative confocal-microscopic hard laryngoscope system (ICMHL).Methods ICMHL system integrated the technique of existing laryngoscope and confocal microscopy,which allows doctors to observe the macrostructure and microstructure of lesions at the same time. Results With the effect of fluorescein sodium,ICMHL system could record the dynamic changes of cells at a rate of 30 fps,and the confocal-microscopic host machine could photograph images at a rate of 230 fps and diagnose invisible minute lesions.Conclusion ICMHL system provides a new,real-time approach for clinic biopsy.

Objective To prepare chitosan (CS)-compound Yizhihao-nanoparticles (NP) and to investigate its antibacterial activity. Methods CS NPs were formed by the incorporation of CS and Na3PO4. CS-compound Yizhihao NPs were prepared by ion-cross-linking. The particle sizes and surface charges of CS NPs were determined by Malvern Zetasizer 1000-HAS and atomic force microscope (AFM), respectively. The antibacterial acitivity of CS-compound Yizhihao-NPs was studied in vitro and compared with that of compound Yizhihao powder. Results Malvern Zetasizer 1000-HAS and AFM demonstrated that the diameter of CS-compound Yizhihao NPs was (137.00±14.28)nm and CS NPs had (16.90±1.32)mV positive surface charges. The minimal inhibitory concentrations (MIC) of CS-compound Yizhihao NPs on Staphylococcus aureus,Pneumococcus,β-hemolytic streptococcus, and Escherichia coli were 1:32,1:32,1:16,and 1:2,respectively. The minimal bactericidal concentrations (MBC) of CS-compound Yizhihao-NPs on Staphylococcus aureus,Pneumococcus,β-hemolytic streptococcus, and Escherichia coli were 1:16,1:16,1:8, and 1:2,respectively. The antibacterial efficacy of CS-compound Yizhihao-NPs to Staphylococcus aureus,Pneumococcus,and β-hemolytic streptococcus had been improved significantly (P<0.05). Conclusion CS-compound Yizhihao-nanoparticles have obvious antibacterial activity to the Staphylococcus aureus,Pneumococcus,and β-hemolytic streptococcus,which lays the experimental foundation for new preparation of traditional Chinese medicine in future research.

Objective To discuss surgical techniques of laparoscopic treatment for intrahepatic stones.Methods A total of 57 cases of intrahepatic stones from March 2000 to March 2005 were studied. Under laparoscopic visualization,openings of left and right hepatic bile ducts were exposed through a longitudinal incision in the common hepatic duct to the bifurcation of left and right hepatic ducts.Stones in left and right hepatic bile ducts were evacuated with the use of a lithotomy forceps,a tiny basket,or pressure irrigation.Then openings of secondary hepatic ducts were exposed through the dilated primary ducts for the removal of stones in secondary hepatic ducts.Sometimes even openings of tertiary hepatic ducts could be seen for stone removal.When mud-or sand-like calculi were encountered,repeated irrigation of bile ducts was carried out.Results Conversions to open surgery were required in 3 cases(3/57,5.3%).The time of operation was 75～275 min(136?54 min).Residual stones were found in 49 cases(49/57,86.0%),which required postoperative choledochoscopy for 1~4 times to clear the intrahepatic stones.Complete clearance of all intrahepatic stones was achieved in 53 cases(53/57,93.0%).In 2 cases of calculi impacted in the lower common bile duct,laparoscopic electrohydraulic lithotripsy was performed for stone extraction.Postoperative bile leakage occurred in 5 cases(5/57,8.8%),and was cured with tube drainage.Follow-up observations for 0.5~5 years(2.3+1.5 years) in 43 cases showed excellent outcomes in 38 cases(88.4%),good outcomes in 3 cases(7.0%),and poor in 2(4.6%).Conclusions Intrahepatic stones can be removed laparoscopically through a longitudinal incision in the common hepatic duct to the bifurcation of left and right hepatic ducts for the exposure of primary and secondary hepatic ducts,or even tertiary hepatic ducts.

Objective To prepare the nanometer particles (NPs) of chitosan-5-fluorouracil (5-FU), and to study its characters of drug release in vivo. Methods Cross-linking polymer technique was employed to prepare the chitosan-5-FU NPs, and their characters were detected by scanning electron microscope and photon correlation spectroscope (PCS); the loaded capacity was measured by ultraviolet spectrophotometry; high-performance liquid chromatography was used to detect the characters of drug release in vivo. Results The chitosan-5-FU-NPs were found to be round or elliptic in shape, with 120 to 150nm in diameter and having a good dispersive ability. The loaded capacity was 31.000%?0.001%. The blood concentration of 5-FU was controlled at 76?g/L, and it was maintained for 48h. Conclusion As a vehicle, chitosan-5-FU NPs can change the behavior of pharmacokinetics and prolong the cycle time of 5-FU in vivo. Chitosan-5-FU NPs ran reduce the initial burst and prolong the releasing time.

Objective To investigate the cytotoxicity of ADM-PBCA-NP on L-02 cells.Methods L-02 cells were cultured in vitro and the LDH activity of supernatant liquid of culture cells was examined.The toxicity of ADM-PBCA-NP,ADM and PBCA-NP to L-02 cells by the MTT assay was also determined,and the haemolysis function of PBCA-NP with different concentrations was detected.Results The cytotoxicity of ADM-PBCA-NP,ADM and blank PBCA nanoparticles to L-02 cells under the 10-6 mol/L concentration range was not cytototic(grade 1).LDH activity of supernatant liquid of culture cells showed no differences between the 3 groups.Conclusions Nanoparticles of ADM-NP and PBCA-NP in the 10-6 mol/L concentration range have no significant toxic effect on L-02 hepatic cells;and in a certain concentration range,the cell compatibility is excellent and will not lead to hemolysis.

Objective To set up an efficient and rapid method for detecting CK20 expression in peripheral blood of patients with colorectal carcinoma, and explore the relationship between CK20 expression and micrometastasis of colorectal carcinoma. Methods CK20 mRNA expression in peripheral blood of 36 patients with colorectal carcinomas was detected at various time points before and after operation by fluorescent RT-PCR. The mutation of p53 gene was also detected using SSCP. Results The positive rate of CK20 mRNA expression in peripheral blood before and 24 hours after operation was 75%(27/36) and 83.3%(30/36), respectively. After the short-term chemotherapy, the positive rate of CK20 mRNA expression was 36%(13/36). No mutation of p53 gene was found in those patients. Conclusion Fluorescent RT-PCR for detecting CK20 mRNA expression in peripheral blood was simple and efficacious. It was useful to monitor micrometastasis of colorectal carcinoma.

BACKGROUND: The polarity and the layer-by-layer coating method which are utilized to improve the membrane surface of optical glasses is a new focus for researching in the world. OBJECTIVE: To prepare a stable hydrophilic anti-fogging coating by surface modification. METHODS: Hydrophilic anti-fogging coatings of complexes of polyacrylic acid (PAA), cationic polyacrylamide (CPAM) and sodium silicate were fabricated by layer-by-layer coating method. Subsequently, the stable multilayer films were obtained by thermal torrefaction. Then the transmittance, hydrophlicity, and hardness were tested. RESULTS AND CONCLUSION: In the wavelength coverage of 200 nm, the transmittance of the anti-fogging coatings was above 92.9%. In the wavelength coverage of 700-800 nm, the transmittance reached 98.1%, suggesting that the membrane had the good transmittance. Water drop dispersed completely after 230 ms when it contacted with the surface of the multilayer films, suggesting that it had the good hydrophilicity. The hardness of stable films structure was 4 H. The layer-by-layer coating method was simple and favorable for preparing the anti-fogging coatings with good product properties including good stability, anti-fogging function and the improved transmittance.

Objective　To study the viability and histological change of encapsulated rat hepatocytes after being transplanted into abdominal cavity of rat. Methods　The two-step collagenase perfusing method was used to separate hepatocytes from Wistar rat liver. The separated hepatocytes were purified with Percoll density gradient centrifugation and encapsulated by the alginate-barium method. Then the purified hepatocytes were transplanted into abdominal cavity of SD rats (group 1) and the encapsulated hepatocytes were transplanted into abdominal cavity of SD rats (group 2) and Wistar rats (group 3). At different time points post-transplantation, trypan blue stain exclusion was used to determine the viability of recovered hepatocytes. The histological changes of transplanted microencapsulated hepatocytes was examined using HE stain. Results　Twenty-four h after transplantation, the viability of hepatocytes between group 1 and group 2 showed significant difference (P<0.01), but there was no significant difference between group 2 and group 3 (P>0.05). At day 4 and day 7 after transplantation, the viability of hepatocytes showed significant difference between group 1 and group 2, and group 2 and group 3 (P<0.01). At day 14 after transplantation, no significant difference was found in the viability of hepatocytes between group 2 and group 3 (P>0.05). From day 4 post-transplantation, fibrosis overgrowth was found around some microencapsules, and it was more obvious in group 2 than in group 3. Conclusions　 Microencapsulation can provide protection to transplanted hepatocytes from host immunorejection, and thus increase the viability of hepatocytes post transplantation. The existence of inadequately encapsulated microencapsule cause the fibrosis overgrowth around these capsules, resulting in ischemia and subsequent necrosis of the hepatocytes and decreasing hepatocyte viability.

Objective To investigate the timing of endoscopic treatment for acute cholangitis of severe type(ACST) accompanying multiple organ dysfunction syndrome(MODS).Methods On the basis of routine medical measures,such as oxygen inhalation and antishock treatment,9 patients with ACST accompanying MODS were given endoscopic retrograde cholangiopancreatography(ERCP) with endoscopic sphincterotomy(EST),or endoscopic nasobiliary drainage(ENBD) after needle electrode fenestration and stone removal with basket,or endoscopic retrograde biliary drainage(ERBD) with internal stent.Results The endoscopic treatment was successfully accomplished within 35 min in all the 9 patients.Seven patients at stage 1~2 of MODS rehabilitated at 1~2 weeks after treatment,while 2 patients at stage 3 of MODS died in 2 weeks.Conclusions Endoscopic treatment should be applied to patients with ACST at stage 1~2 of MODS as early as possible.For patients with ACST at stage 3~4 of MODS,however,emphasis should be laid on the prevention of organ failure and the reversion of organ functions.