Epigenetic regulation involved in eukaryotic gene expression plays an important role in the progression of colorectal cancer. Colorectal cancer epigenetics is evolved in DNA methylation which is associated with the activation of oncogene and inactivation of tumor suppressor gene. The potential reversibility of DNA methylation offers exciting opportunities for therapy and diagnosis of colorectal carcinoma.

Modern medicine is in the new phase of transform from biomedical model to bio-psycho-social medical model. Biological factors interact with the social and psychological factors. We should think highly of not only biological factor but also social factor and psychological factor in the prevention and treatment of gastrointestinal tumor. It is an important mission of medical workers to carry out new medical model in clinical practice.

There were some limitations existed in current teaching mode of diagnostics,including simple evaluation methods,mechanical internship for body sign,tedious internship for laboratory diagnosis and unsustainable interest-stimulating.Interest teaching was proposed in the teaching reform and some concert measures were implemented including interesting inquiry,interesting skill examination,interesting teaching of laboratory diagnostics,simulated case discussion,interesting training of centesis as well as interesting clinical involvement and interesting medical community activities.The interesting teaching contributed to the improvement of students'comprehensive analysis ability,practical ability,adaptability,humanistic quality,English communication ability and doctor-patient communication,which is of grate importance.

ObjectiveTo explore the effect of CQI on the teaching of physical diagnostics.MethodsThe theory and practice of CQI are discussed in accordance with specific conditions of the teaching of physical diagnostics.ResultsThe level of the teaching of physical diagnostics can be raised by applying CQI.ConclusionThere will be broad prospects in the application of CQI to quality teaching of physical diagnostics.

Objective:To explore the expression pattern and function of miR-126 in human colon cancer and the underlying mechanisms.
Methods:hTe expression pattern of miR-126 in high-density human colon cancer tissue microarray was analyzed by in situ hybridization. Further more, the biological function of miR-126 in colon cancer in vitro was investigated by establishing a stable miR-126 over-expression cell lines.
Result:hTe expression of miR-126 was lower in the tumor tissue, especially in metastasis tissue. hTe down-regulation of miR-126 was more obvious in the patients who displayed bad prognosis (P=0.025). Over-expression of miR-126 in colon cancer cell was able to inhibit cell proliferation, promote cell apoptosis and reduce the invasive ability. MiR-126 significantly enhanced the sensitivity of the colon cancer cell to chemotherapeutic drug. It has been shown that IRS1, SLC75A and TOM1 were the potential target genes of miR-126 in colon cancer.
Conclusion:MiR-126 was able to inhibit the development of colon cancer and its level was closely related with the prognosis of patients with colon cancer. The potential target genes for miR-126 might include IRS1, SLC7A5 and TOM1. Therefore, miR-126 might be a therapeutic target for colon cancer diagnosis and treatment.

Objective To evaluate the therapeutic effect of Ursodeoxycholi acid on the treatment of liver cirrhosis with hepatitis B. Methods Eighty-four patients with liver cirrhosis were randomly divided into 2 groups:42 to the treatment group who were given oral capsules of Ursodeoxycholi acid combined with reduced glutathione,and the other 42 to the control group who received Yinzhihuang intravenously, combined with reduced glutathione. Therapeutic efficacy,liver function and its normalization rate,and score of Child-pugh-Turcotte (CPT)were observed after 4 week treatment and 8 week treatment. Results The therapeutic efficacy had no significant difference between the treatment group and the control group (P>0.05). Compared with the control group, the values of γ-glutamyl transpeptidase (γ-GT), alkaline phosphatase (AKP) and globulin(GLO) of the treatment group decreased more significantly (P<0.05), and the normalization rates of γ-GT and AKP in the treatment group was significantly higher than that in the control group at 8 week. The decreased levels of total bilirubin (TBIL) and direct bilirubin(DBIL) were not significantly different between the 2 groups (P>0.05). At 4 week the decrease level of ALT in the 2 groups was similar (P>0.05), while at 8 week the values of ALT reduced more significantly than that of the control group(P<0.05). The score of CPT of the 2 groups were not different after 4 week and 8 week treatment (P>0.05). Conclusion Ursodeoxycholi acid can obviously decrease the values of γ-GT, AKP and GLO in liver cirrhosis with hepatitis B, which may be related to Ursodeoxycholi acid relieving the injury of bile duct and enhancing biliary transport.

Objective To investigate the expression and function of NGX6-S (short transcript) and NGX6-L (long transcript) in colorectal cancer. Methods In situ hybridization was used to detect the expression of these 2 transcripts in colorectal cancer tissues and paired normal tissues, and analyze the correlation between NGX6 and carcinoembryonic antigen (CEA). Results The expression of NGX6-S was higher than that of NGX6-L in the colorectal cancer tissues (P=0.008). The expressions of NGX6-S and NGX6-L were not different among the 4 stages of colorectal cancer (P＞0.05). The expression of NGX6-S in the colorectal cancer tissues of Duke A, B, and C stages had no difference with that of the paired normal tissues (P＞0.05). Inversely, the expression of NGX6-S in the colorectal cancer tissues of Duke D stage was lower than that in the paired normal tissues (P=0.033). NGX6-L expression was not different between the colorectal cancer tissues and the paired normal tissues in 4 stages(P＞0.05).The expression of NGX6-S and NGX6-L had no correlation with the serum concentration of CEA. Conclusion NGX6-S may play an important role in colorectal cancer, and the lowered expression of NGX6-S may contribute to the distant metastasis of colorectal cancer.

Objective To explore the application of propofol combined with midazolam intrave-nous anesthesia in pediatric upper gastrointestinal endoscopy, Methods A total of 497 ASA Ⅰ～Ⅱ patients who received sedative upper gastrointestinal endoscopy were assigned to a children group (2～14 years) and an adults group (18～65 years). The 2 groups were treated with midazolam (0.02～0.03 mg/kg, iv) and propofol (0.6～0.7 mg/s, iv) with an interval of 3～5 minutes. Enterseopy was inserted at light sleep, relaxing muscles, and disappearance of eyelash relaxation. Combining of pro-endoscopy, reaction to intravenous administration, dose of propofol, reaction to en-doscopy, time of returning to consciousness, changes of SpO2, R, HR, and BP, and sedative quali-ty were evaluated. Results Good sedation of the 2 groups after intravenous administration was ob-served. Rate of combining of pro-endoscopy in children was lower (42%) than that in adults (100%). The incidence of restlessness, hyperphasia, temporary decreasing of SpO2, dose of propofol of per kilogram weight, time of returning to consciousness in the children were 82.7%, 17%, 2.4 mg/kg, and (17.5±3.2)min, respectively, which were all higher in the adults [9%,4%,1.4 mg/kg, and (9.5±1.3)min, P<0.01]. HR and BP decreased in the 2 groups, and recovered rapidly after the endoscopy. There was no significant difference between the 2 groups (P>0.05). Conclusion It is safe and effective to use propofol combined with midazolam intravenous sedation anesthesia in pediatric upper gastrointestinal endoscopy.

To observe the effect of Helicobacter pylori(H.priori) on cell gap junction ultrastructure of gastric epithelial cells,and to explore carcinogenic mechanism of H.priori from the changes of cell gap junction,BGC-823 cells were co-cultured with different H.prlori strains for 24 h and 48 h.The cell gap junction ultrastructure was observed under transmission electron microscope with sample preparation of fixation and embedding in situ.In 70 patients with gastric eancer(GC),H.priori was detected by rapid urease test,basic fuchsin stain and 14C-urea breath test.The CagA gene of H.prlori was determined by PCR and the cell gap junction ultrastructure was observed under transmission electron microscope.More cell gap junctions and junction complexes of BGC-823 cells were found in control group without H.priori.Groups with H.priori had less number of cell gap junctions,less number of junctions/unit perimeter,shorter length of junctions/unit perimeter,and bigger width of the intercellular space,comparing to control groups without H.priori(P＜ 0.001 or P＜ 0.005).The number of cell junctions and the number of junctions/unit perimeter in the groups co-cultured with NCTC J99,GC 01 and NCTC 11639(CagA+) were less than that in the groups co-cultured with NCTC 12908(CagA-)(P ＜0.001 or P＜0.05),and the length of junctions/unit perimeter in the groups co-cultured with NCTC J99 and GC 01 was shorter than that in the groups co-cultured with NCTC 12908 (P＜ 0.001).In patients with GC,the number of cell junctions,the number of junctions/unit perimeter and the length of junctions/unit perimeter in group H.priori infection were all less than those in group without H.prior/infection(P ＜0.001),and that in CagA+ H.prlori group were less than that in CagA- H.prlori group,but its smallest width of the intercellular space was longer than that in CagA- H.prlori group.The above results showed that the changes of cell gap junction of gastric epithelial cells were associated with H.prlori infection especially CagA+ H.prlori infection.

Objective To explore the safety and the efficacy of the two-stage sedation administration method for the elderly in gastroscopic examination. Methods 128 elderly patients were divided into two groups according to age and body mass index (BMI), and were given sedation treatment before gastroscopic examination by two-stage administration method(group TSAM, n= 64)and continual administration method (group CAM, n= 64) of analgesics respectively. The following major data were recorded : ( 1 ) mean artery pressure (MAP) ;( 2 ) Blood oxygen saturation ( SpO2 ) ;(3)sedation level;(4) recovery time;(5) the amount of propofol used for sedation;(6) electrocardiogram (ECG) ;(7)the degree of pharyngeal malaise;(8) the oblivion degree of malaise. Results There was no significant difference in MAP alteration between two methods(P>0. 05). Compared with group CAM, the decreased degree of SpO2 was slighter and no patient's SpO2 was lower than 90% in group TSAM (P<0. 05). Fifty-seven patients in group TSAM fell into sedative state for gastroscopy with OAA/S score 2, while sixty patients in group CAM with OAA/S score 2, which represented a deeper sedation level in group CAM (P<0. 01). The recovery time was shorter and the amount of propofol used was significantly less in group TSAM than in group CAM (P<0. 01). During the process of gastroscopic exmaination, ST-T change and arrhythmia in ECG were not seen in either of these two groups. The pharyngeal malaise of patients in group TSAM was more severe than in group CAM (P<0. 01). However, there was no difference in the oblivion degree of malaise between two methods(P>0.05). Conclusions The two-stage sedative administration method is safer and more effective for gastroscopic examination for the elderly.