Experimental studies on the myocardial ischemia and reperfusion injury in 16 anaethetized SDrats,of which,8 animals were pretreated with morphine(5 mg/kg,i.p.)for preventing of arrhyth-mias,were studied immunocytochemically with anti-muscle actin specific monoclonal antibody (HHF_(35)),8 shan-operated rats were used as control.With HHF_(35) ABC immunocytochemical method,the area of myocardial ischemia and reperfusion injury(without morphine)showed decrease or ab-sence of staining,large areas of staining loss were also seen.In the group with morphine,only smallfoci of staining absence were shown.The myocardium in control animals showed evenly positive stain-ing.No change were seen with HE staining in all groups.The results obtained with HHF_(35) stainingsupport its important value in studying on myocardic reperfusion injury,and indicated that the degreeof myocardic damage may be relative to the arrhythmias in myocardial reperfusion injury.

Objective To explore the relationship between the polymorphism of excision repair cross-complementation group 1 (ERCC1) C8092A locus and the efficacy and prognosis of platinum-based chemotherapy for lung cancer (LC), and to provide a theoretical basis for precision treatment of LC. Methods From January 2014 to October 2017, 120 patients from two tertiary hospitals in Haikou City, and with pathologically confirmed lung cancer treated with platinum-based chemotherapy were selected as the research objects. After informed consent was obtained, peripheral blood samples were collected for DNA extraction, and the genotype of ERCC1 C8092A locus was detected by mass spectrometry. WHO's Response Evaluation Criteria in Solid Tumours (RECIST) was used to judge patients' chemotherapy efficacy and patients' survival status was obtained by telephone follow-up and other means. Results Among the 120 LC patients, the genotype frequencies of ERCC1 C8092A locus were 67 cases of CC wildtype (55.8%), 45 cases of CA heterozygous type (37.5%), and 8 cases of AA rare mutation type (6.7%), which conformed to Hardy-Weinberg equilibrium (χ2=0.140, P>0.05). The total effective rate of chemotherapy was 32.5%, with the highest effective rate in patients with the CA genotype (42.2%) at the ERCC1 C8092A locus and the lowest in patients with the CC genotype (25.4%). The overall one-year survival rate was 68.3% and the three-year survival rate was 35.8%. The patients with ERCC1 C8092A AA genotype had the lowest survival rate, with a one-year survival rate of 50.0% and three-year survival rate of only 25.0%. However, there were no statistical differences in the overall survival rate among the three genotypes of carriers of ERCC1 C8092A (χ2=0.328, P=0.849). Conclusions The polymorphism of ERCC1 C8092A locus is associated with the efficacy of platinum-based chemotherapy for LC, and patients with CA genotype have the highest efficacy. The one-year and three-year survival rates of patients with CC genotype are significantly higher than those of CA and AA genotypes.

Objective:To explore the feasibility of 60 kV tube voltage combined with reduced contrast medium in CT pulmonary angiography (CTPA).Methods:Totally 60 outpatients and inpatients with a body mass index (BMI) of less than 25 kg/m 2 who had suspected pulmonary embolism and were arranged for CTPA examination were enrolled in this study. They were divided into a control group and an test group according to the random number table method. A protocol with a conventional dose was adopted in the control group. This scheme consisted of 100 kV tube voltage and injection of 50 ml of contrast medium at the rate of 4.5 ml/s. A scheme with a low dose was employed in the experimental group. Specifically, this scheme involved 60 kV tube voltage scheme and injection of 30 ml of contrast medium mixed with 20 ml of normal saline at a rate of 4.5 ml/s. The objective image quality was assessed by measuring the Hounsfield units (HU) of five regions of interest (ROIs), i. e., pulmonary trunk, right and left pulmonary arteries, and right and left lower lobar arteries, and the signal-to-noise ratio (SNR) and the contrast-to-noise ratio (CNR) were calculated. Moreover, the radiation doses were recorded. The subjective image quality was assessed by radiologists using a 5-point scale based on the overall image quality and the enhancement homogeneity of pulmonary arteries. The noise, SNR, CNR, and radiation dose of the two groups were compared using the Mann-Whitney U test, and the differences in the subjective image quality between the two groups were compared using the χ2 test. Results:All images met the requirements for clinical diagnosis. The two groups did not show significant differences in the overall subjective quality of CTPA images and enhancement scores ( P > 0.05), and in the average attenuation values of the pulmonary trunk and the left and right lower lobar arteries ( P > 0.05), but exhibited statistical differences in the average attenuation values of the left and right pulmonary arteries ( t = 2.75, 3.91, P < 0.05). There was no significant difference in the average background noise between the two groups ( P > 0.05). The test group had higher CNR of the left pulmonary artery and higher SNR and CNR of the right pulmonary artery than the control group, with statistically significant differences ( t = 0.04, 2.41, 3.08, P < 0.05). There was no significant difference in the SNR and CNR of other pulmonary artery branches between the two groups ( P > 0.05). The test group had an average effective dose of 1.24 mSv for CTPA, which was about one-third of that of the control group, with statistically significant differences ( t = 21.65, P < 0.05). Conclusions:The scheme of 60 kV tube voltage and reduced contrast medium for CTPA is feasible for patients with BMI < 25 kg/m 2. Using this scheme, the radiation and iodine dose can be reduced without affecting image quality.

Objective To explore the effect of medical polyethylene glycol berberine on clinical outcomes after curettage. Methods A total of 166 curettage patients were divided into study group (n = 80) and control group (n = 86) by the patients' willingness. The two groups were given routine curettage, and the study group were additionally given 3 mL medical polyethylene glycol berberine by uterine cavity injection, while the control group infused no drugs. The postoperative endometrial thickness, menstruation situation were compared, and the re-pregnancy conditions of the patients in control group (n = 20) and experimental group (n = 32) with two-child requirement at follow-up and in one and a half year after follow-up were compared. Results The endometrial thickness in the study group was thicker than that in the control group [ (9. 44 ± 1. 95) mm vs. (8. 65 ± 2. 28) mm, P ＜ 0. 05], the proportion of the endometrial thickness ＜ 8 mm in the study group was lower than that in the control group[27. 5％ (22/80) vs. 38. 4％ (33/8), P ＜ 0. 01]. The ratio of patients with eumenorrhea was lower than that in the control group[ (10％ (8/80) vs. 16. 3％ (14/86) ], but there was no significant difference (P＞ 0. 05). The clinical pregnancy rate of the patients who had pregnancy requirements in the control group was higher than that in the control group [93. 75％ (30/32) vs. 70％ (14/20), P ＜ 0. 05]. Conclusion Medical polyethylene glycol berberine can promote the pregnancy rate. Meanwhile, the operation is simple and has higher compliance rate, which is an effective way in improving clinical outcomes.

Objective To explore the effect of medical polyethylene glycol berberine on clinical outcomes after curettage. Methods A total of 166 curettage patients were divided into study group (n = 80) and control group (n = 86) by the patients' willingness. The two groups were given routine curettage, and the study group were additionally given 3 mL medical polyethylene glycol berberine by uterine cavity injection, while the control group infused no drugs. The postoperative endometrial thickness, menstruation situation were compared, and the re-pregnancy conditions of the patients in control group (n = 20) and experimental group (n = 32) with two-child requirement at follow-up and in one and a half year after follow-up were compared. Results The endometrial thickness in the study group was thicker than that in the control group [ (9. 44 ± 1. 95) mm vs. (8. 65 ± 2. 28) mm, P ＜ 0. 05], the proportion of the endometrial thickness ＜ 8 mm in the study group was lower than that in the control group[27. 5％ (22/80) vs. 38. 4％ (33/8), P ＜ 0. 01]. The ratio of patients with eumenorrhea was lower than that in the control group[ (10％ (8/80) vs. 16. 3％ (14/86) ], but there was no significant difference (P＞ 0. 05). The clinical pregnancy rate of the patients who had pregnancy requirements in the control group was higher than that in the control group [93. 75％ (30/32) vs. 70％ (14/20), P ＜ 0. 05]. Conclusion Medical polyethylene glycol berberine can promote the pregnancy rate. Meanwhile, the operation is simple and has higher compliance rate, which is an effective way in improving clinical outcomes.

Objective To study the pathological changes of the sudden death cases due to the dysplasia of the cardiac conduction system. Methods Using the newly established pathological sampling method by our research team, 26 hearts of unidentified sudden deaths excluding trauma, poisoning and diseases were collected and observed optically with H&E staining, Masson staining and immunohistochemical staining. Results Among the 26 cases, there were dysplasia in the cardiac conduction system,structural abnormalities, tissue or structure shift, fibrous cushion in the sinoatrial node and 9 cases have 2~3 abnormalities at the same time. Among the age groups from 16 to 30, 21 cases (80.8%) showed dysplasia of the cardiac conduction system. Conclusion The dysplasia of the cardiac conduction system may be one of the predominant reasons for the sudden death in young adults.

Background/Aims: Epstein-Barr virus-associated gastric cancers (EBVaGCs) have unique molecular and clinicopathological characteristics. The cyclic GMP-AMP synthase-stimulator of interferon genes (STING) pathway is recently recognized as the critical innate immunity against pathogens and tumors. STING is also a master regulator in the cancer-immunity cycle and targeting STING could synergize with existing immune-checkpoint therapies. However, the role of STING in GC, especially in EBVaGC, and its correlation with programmed death-ligand 1 (PD-L1) remain largely unclear. Methods: We collected 78 cases of EBVaGCs and 210 cases of EBV-negative GC (EBVnGC) from a total of 1,443 cases of GC analyzed by EBV-encoded small RNA in situ hybridization. We investigated STING and PD-L1 expression and their concomitant prognostic value in EBVaGCs and EBVnGCs using tissue microarray and immunohistochemistry. The effects of STING and PD-L1 expression on the overall survival of patients with EBVaGC or EBVnGC were assessed by univariate and multivariate analysis. Results: We found that both STING and PD-L1 exhibited significantly higher expression in the EBVaGCs than that in the EBVnGCs. The expression of STING was positively correlated with that of PD-L1 in EBVaGCs. Simultaneous negative expression of STING and PD-L1, and positive expression of STING were independent prognostic risk factors for EBVaGC and EBVnGC, respectively. Conclusions This is the first prognostic retrospective study of STING and PD-L1 expression and the prognosis among EBVaGC and EBVnGC. The expression and prognostic value of STING and PD-L1 are different in the two types of GCs. STING and PD-L1 are promising prognostic biomarkers and therapeutic targets for EBVaGC and EBVnGC.

OBJECTIVE：To study the ef fects of Gegen qinlian decoction （GGQLD）on blood lipid and blood glucose of hyperlipidemia（HLP）model rats ，and to explore its mechanism from the perspective of intestinal flora. METHODS ：Totally 48 rats were randomly divided into blank control group （n＝8）and modeling group （n＝40）. For consecutive 5 weeks，model group was given high-lipid diet to induce HLP model ；blank control group was given routine diet. After modeling ，30 modeling rats were randomly divided into model group ，simvastatin group （positive control ，10 mg/kg），GGQLD high-dose ，medium-dose and low-dose groups （14.85，4.95，1.65 g/kg，by crude drug ），with 6 rats in each group. Blank control group and model group were given constant volume of normal saline intragastrically ；administration groups were given relevant medicine intragastrically ，once a day，for consecutive 11 weeks. At the same time ，each group was continuously given corresponding diet. After the last medication ， body mass and body length of rats were determined ，and Lee ’s index was calculated. Serum levels of TG ，TC，HDL-C，LDL-C and fasting blood glucose （FBG）were determined in rats. DNA of rat caecum content was extracted for 16S rRNA V 3-V4 region sequencing. The Two-part model was used to analyze the correlation between intestinal flora with lipids and blood glucose. RESULTS：After 11 weeks of administration ，compared with blank control group ，the body mass ，body length ，Lee’s index ， serum levels of TC ，TG，HDL-C and FBG of model group were increased significantly （P＜0.05 or P＜0.01），while the level of HDL-C was decreased significantly （P＜0.05）. Compared with model group ，body mass and Lee ’s index and serum levels of TG ， FBG of rats in GGQLD high-dose group ，and serum levels of TC ，TG in GGQLD medium-dose group ，as well as serum level of TG of rats in GGQLD low-dose group was decreased significantly （P＜0.05 or P＜0.01）. Correlation analysis with intestinal flora showed that TC and TG shared 3 operational taxonomic units （OTU），including OTU 559，OTU701 and OTU 135（OTU135 was also shared with FBG ），which were all positively correlated with the level of TC ，TG and FBG （P＜0.01）. The three OTU were annotated as Tyzzerella of Spirillaceae ，Anaerotruncus of Verrucaceae and Peptoclostridium of Streptococcidae ，respectively. High-dose and low-dose GGQLD had a down-regulating effect on Tyzzerella and Anaerotruncus（P＜0.05 or P＜0.01），while had up-regulating effect on Peptoclostridium（P＜0.01）. CONCLUSIONS ：High-dose GGQLD （14.85 g/kg）can effectively reduce the body mass and blood lipid of HLP model rats ，and can prevent the abnormal increase of blood glucose of model rats. The mechanism may be associated with that the reduction of intestinal flora （Tyzzerella，Anaerotruncus）content.