Japan is one of the main trading partners for the import and export of experimental animals in China,and its quarantine and supervision policies for the import and export of experimental animals are very detailed and strict.This article takes experimental dogs,cats,and monkeys as examples to provide an in-depth analysis of the quarantine and supervision policies for the main experimental animals exported to Japan.At the same time,it reflects on the current laws and regulations,import and export management method,standards,biosafety,breeding and management status,as well as the import and export business status of experimental animals in China.Suggestions are provided in improving the laws and regulations,import and export management method,ensuring national biosafety,improving the management level of experimental animal breeding,and promoting the import and export trade of experimental animals,in order to provide reference for comprehensively improving the production,use,and breeding management level of experimental animals in China and strengthening the trade between China and Japan.

Endodontic diseases are a kind of chronic infectious oral disease.Common endodontic treatment concepts are based on the removal of inflamed or necrotic pulp tissue and the replacement by gutta-percha.However,it is very essential for endodontic treatment to debride the root canal system and prevent the root canal system from bacterial reinfection after root canal therapy(RCT).Recent research,encompassing bacterial etiology and advanced imaging techniques,contributes to our understanding of the root canal system's anatomy intricacies and the technique sensitivity of RCT.Success in RCT hinges on factors like patients,infection severity,root canal anatomy,and treatment techniques.Therefore,improving disease management is a key issue to combat endodontic diseases and cure periapical lesions.The clinical difficulty assessment system of RCT is established based on patient conditions,tooth conditions,root canal configuration,and root canal needing retreatment,and emphasizes pre-treatment risk assessment for optimal outcomes.The findings suggest that the presence of risk factors may correlate with the challenge of achieving the high standard required for RCT.These insights contribute not only to improve education but also aid practitioners in treatment planning and referral decision-making within the field of endodontics.

The overall health condition of patients significantly affects the diagnosis,treatment,and prognosis of endodontic diseases.A systemic consideration of the patient's overall health along with oral conditions holds the utmost importance in determining the necessity and feasibility of endodontic therapy,as well as selecting appropriate therapeutic approaches.This expert consensus is a collaborative effort by specialists from endodontics and clinical physicians across the nation based on the current clinical evidence,aiming to provide general guidance on clinical procedures,improve patient safety and enhance clinical outcomes of endodontic therapy in patients with compromised overall health.

There are several special types of tumors in the rectal and anal canal,such as neuroendocrine tumors(NETs),gastrointestinal stromal tumors(GIST),squamous cell anal carcinoma(SCAC),anorectal malignant melanoma(ARMM),and primary rectal lymphoma(PRL).They are rare and have different clinical characteristics from the rectal cancer,resulting in insufficient understanding of them by clinicians.This article reviews the diagnosis and treatment of special types of tumors in the rectal and anal region.

In the current scientific research training of the academic postgraduate students majoring in clinical laboratory diagnostics, there are many problems including insufficient scientific research level, poor scientific research environment and so on. Based on many years of experience on cultivating postgraduate students and starting from the five factors of 4M1E (man, machine, material, method and environment) method, a scientific strategy is proposed, and then the scientific research ability and level of academic postgraduate students majoring in clinical laboratory diagnostics could be improved by exerting its own self-motivation, strengthening the guidance of tutors, improving training tools, heightening scientific thinking, and enhancing environmental friendliness of scientific research.

Endodontic microsurgery is a vital treatment modality for teeth with persistent periradicular pathoses that have not responded to nonsurgical retreatment. The principle is to determine the reason for failure, completely eliminate the infection and promote periapical healing. Within recent years, endodontic microsurgery has evolved to become standardized and presents with a high success rate. However, its outcome is still influenced by many factors, including anatomy, periodontal condition, crown-to-root ratio, occlusion, the type of periradicular lesion, and prosthesis. Moreover, endodontists always concentrate on “the apex”, paying little attention to the general preoperative evaluation, accurate diagnosis, and comprehensive treatment plan. This article reviews the latest literature on these issues and the clinical experience of our research group and discusses the correlation between endodontic microsurgery and other oral disciplines, including periodontology, prosthodontics, oral implantology, oral and maxillofacial surgery and orthodontics. The oral interdisciplinary assessment should be made with comprehensive consideration of the root canal system, periradicular lesion, adjacent anatomical relationships, periodontal condition, occlusion, and esthetic rehabilitation. Based on these findings, the continuity of treatment will be optimized, and the best treatment plan will be proposed to provide clinical strategies for the diagnosis and treatment of complex periradicular diseases.

OBJECTIVE： To establish the method for simultaneous determination of 4 kinds of flavones such as sutellarin， sutellarein， luteolin and apigenin in Scutellaria barbata decoction pieces， and to conduct principle component analysis. METHODS： HPLC method was adopted. The determination was performed on Agilent ZOXDB-C18 column with mobile phase consisted of methanol-acetonitrile （80 ∶ 20，V/V）-1％ acetic acid solution （gradient elution） at the flow rate of 1.0 mL/min. The detection wavelength was set at 335 nm， and column temperature was 30 ℃. The sample size was 10 μL. Principal component analysis was carried out by SPSS 20.0 and SIMCA-P 13.0 software. RESULTS： The linear ranges of sutellarin， sutellarein， luteolin and apigenin were 0.131-1.446 μg（r＝0.999 0）， 0.031-0.345 μg（r＝0.999 7）， 0.005-0.055 μg（r＝0.999 2）， 0.024-0.268 μg（r＝0.999 2）， respectively. The limits of quantitation were 1.178 8， 0.602 9， 0.744 1， 1.079 1 ng； the limits of detection were 0.353 6， 0.106 1， 0.223 2， 0.323 7 ng；RSDs of precision， stability and reproducibility tests were all lower than 2％. The recoveries were 99.38％-100.56％（RSD＝0.44％，n＝6）， 91.01％-96.81％（RSD＝2.43％， n＝6）， 91.44％-97.34％（RSD＝2.59％， n＝6）， 96.21％- 99.26％（RSD＝1.23％，n＝6）， respectively. By principal component analysis， principal component 1 and prinicipal component 2 were main influential factors of sample， quality accumulative variance contribution rate of them was 92.573％（＞80％）. The comprehensive score of sample S14-3 was the highest， and the overall quality was relatively good； samples S14-2， S14-3 were the second. These 3 batches of sample were processed and produced in S. barbata planting base with stable quality. CONCLUSIONS： Established method is simple and rapid， and can be used for simultaneous determination of 4 kinds of flavones in S. barbata decoction pieces. Principle component analysis can provide reference for the quality control of S. barbata decoction pieces.

Objective To explore the clinical value of nodal metastatic characteristics in predicting the distant metastasis of papillary thyroid carcinoma (PTC).Methods A total of 1 408 PTC patients who met the inclusion criteria and received initial thyroidectomy at our department from January 2006 to December 2011 were enrolled in this study.Results After a median follow-up time of 7.8 years,distant metastases developed in 46 patients.Patients with lateral neck lymph node metastasis ≥7,individual size of lateral neck lymph node metastasis ≥ 1.15 cm and the total number of cervical lymph node metastasis ≥9 were prone to higher risk of distant metastasis;the high risk group had a lower 10-year distant metastasisfree survival (78.7％ vs.98％,x2 =122.941,P ＜0.01) and a shorter distant metastasis-free survival time (99.2 M vs.122.5 M,x2 =122.941,P ＜ 0.01).Conclusions Lateral lymph node metastasis is an independent risk factor for distant metastasis in PTC patients.

Objective To explore the application and significance of multiple clinical pathway training oriented teaching model in clinical teaching of laboratory diagnostic. Methods Totally 50 medical students enrolled in the Second Military Medical University from September to December in 2015 were divided into experimental group and control group. The course consists of theoretical teaching and experi-mental operation. The pathway group (n=25) were introduced into multiple clinical pathway training oriented teaching method. The theoretical teaching was carried out bysimulation examination application, simulation interpretation and simulation diagnosis and treatment, while the experimental course was carried out by using video teaching combined with actual operation. The control group was taught by traditional teaching method using slide teaching and operation display. The theoretical test including case study and operational skill tests were performed among students in both groups after 10 class hours training . The satisfaction questionnaires were conducted to evaluate the effectiveness and satisfaction of teaching guided by clinical pathway. Differences were compared with independent sample t testing using GraphPad Prism 5.0 statistical software. Results The medical records about professional theoretical test including case study and opera-tional skill test in the pathway group were superior to those in the control group with significant statistical difference (both P<0.05). The records of medical students were (81.84±7.21), (42.00±2.79) in the pathway group and (76.24 ±6.98), (37.00 ±3.71) in the control group. The questionnaire result showed that the pathway group's satisfaction was high, especially with the theoretical knowledge andsceneteaching (higher than 80％). The pathway group believed that multiple clinical pathway training helped to improve learning interest and clinical thinking ability . Conclusions Multiple clinical pathway training oriented teaching model is helpful for the medical students to achieve the basic idea of clinical pathway, improve the profes-sional ability, enhance the interest of learning and the quality of teaching, standardize teaching and promote teaching and learning.

Objective To study the relationship between serum tumor marker level and the apoptosis regulation gene of tumor tissue in the patients with primary hepatocarcinoma .Methods 40 cases of primary hepatocarcinoma and 40 healthy people were in‐cluded into the observation group and control group .Then the levels of tumor marker GP73 ,TK1 ,DKK1 in serum and the expres‐sion of apoptosis regulation gene in tumor tissue were detected in the two groups .Results The serum GP73 ,TK1 and DKK1 levels of the observation group were significantly higher than those of the control group ,the difference was statistically significant (P<0 .05) .The apoptosis inhibiting gene Plk1 ,Livin and Xiap levels in the hepatocellular carcinoma tissue were higher than those in the adjacent normal tissues ,while the pro‐apoptotic gene M TS1 ,Caspase‐3 and Caspase‐8 levels were lower than those in the adjacent normal tissues ,the difference had statistical significance (P< 0 .05) ;serum GP73 ,TK1 and DKK1 levels were positively correlated with Plk1 ,Livin and Xiap levels and negatively correlated with M TS1 ,Caspase‐3 and Caspase‐8 levels .Conclusion The levels of se‐rum GP73 ,TK1 and DKK1 in the patients with primary hepatocarcinoma are abnormally increased ,moreover which are closely cor‐related with the apoptosis regulating gene expression and the ideal indexes to evaluate the disease condition of primary hepatocarci ‐noma .