BACKGROUND: Immune checkpoint inhibitors (ICIs) have good efficacy on most advanced tumors, which brings new hope to patients with advanced tumors. However, the immune system activated by ICIs may attack human normal tissues and organs, resulting in corresponding immunotoxicity, such as checkpoint inhibitor pneumonitis. This article carried out a meta-analysis on the incidence and risk of programmed cell death protein 1 (PD-1) and programmed cell death protein ligand 1 (PD-L1) inhibitor-associated pneumonia in advanced tumors patients. METHODS: The computer retrieval of PubMed, Cochrane Library, EMbase and CNKI was performed, and the studies on the occurrence rate of PD-1/PD-L1 inhibitor-associated pneumonia in terminal cancer patients were collected, with the retrieval time limit of January 2000 to January 2020. Statistical analysis was conducted by using Revman 5.3 and R 3.6.2 software to compare the occurrence rate of pneumonia under different circumstances. RESULTS: 15 studies were included, involving 8,642 patients, of which those with PD-1/PD-L1 inhibitor were treatment group, and those with chemotherapy were control group. The odds radio of all grades of immune pneumonia was 6.63, and that of high grade was 4.87. The occurrence rate of all grades of pneumonia in the ICI group with non-small cell lung cancer (NSCLC) was 1.658 times than other tumors, and that of high grade was 2.299 times. The occurrence rate of all grades of pneumonia in second-line or more treatment with ICI was 0.489 times than that in first-line, and that of high grade was 0.449 times than that in first-line or more treatment with ICI. CONCLUSIONS Compared with chemotherapy, the risk of immune-associated pneumonia is higher in PD-1 and PD-L1 inhibitors, and its occurrence risk is high in the ICI group with NSCLC and the first-line treatment with ICI. This paper provides guidance for clinic treatment of terminal cancers and prevention of complications.

To analyze the characteristics of brain gray matter volume changes and ApoE gene polymorphism in aMCI patients with compared with normal elderly people by voxel-based MRI morphometry and gene detection technology. Exploring the possible correlation in those changes and the pathogenesis of aMCI. Methods Recruiting 14 aMCI patients and 15 normal elderly people who were matched with each other by age，gender，ethnicity，education，living background and determined no blood relationship. To give every case three-dimensional T1WI scan with 3.0T magnetic resonance imaging. We use the SPM12-based DARTEL toolbox to preprocess the structural images obtained from the scan，and then compare voxel-based statistical results of the whole brain gray matter volume of the aMCI group and the control. Detecting the ApoE gene by drawing blood to identify the allele and genotype of the ApoE gene in each sample. The data obtained was analyzed by SPSS20.0 software to calculate the allele frequency and genotype frequency of the three groups of ApoE genes. Results The ε3/ε4 genotype in the group aMCI was significant difference between the aMCI and the control（P<0.05）. Compared with the control，the gray matter atrophy of the aMCI was mainly located in the left insula，superior frontal gyrus,middle frontal gyrus，anterior insula，posteriorcentral gyrus，ventromedial prefrontal lobe，bilateral superior parietal lobule,right angular gyrus. Conclusion ApoE gene polymorphism was associated with the morbidity of patients with aMCI，and ApoEε4 may be a risk factor for aMCI. The thalamus,posterior cingulate cortex were also involved.Gray matter atrophy in patients with aMCI was mainly located in the parietal lobule and the insular.

Objective　To investigate the normal values and differences of proximal nerve conduction in normal adults in Northeast China. Methods　A total of 208 people were selected from the normal results of the electromyography examination in the Second Hospital of Jilin University. The peripheral motion latency（LAT）and amplitude（CMAP）of the upper scapular nerve，phrenic nerve，musculocutaneous nerve and lower extremity femoral nerve were measured. The latency and amplitude of the bilateral phrenic nerve H reflection are also measured，followed by statistical analysis. Results　With the increase of age，the MCV Lat of the superior scapular nerve，phrenic nerve，musculocutaneous nerve and femoral nerve gradually prolonged，and the amplitude of CMAP decreased with the increase of age. The nerve MCV Lat was shorter and the CMAP amplitude was lower in the scapular nerve，sacral nerve，musculocutaneous nerve and femur in female population. The amplitude of the femoral nerve in males was significantly higher than that in females（P<0.05）. There was no significant difference in the latency and amplitude of the proximal nerves of the left and right limbs. The age and gender were opposite to the phrenic nerve H. The latency and amplitude of reflection are small and there is no statistical difference. Conclusion　The measured values of MCV in the proximal nerve of adults of different ages are related to age and gender. In clinical application，the judgment should be made with reference to the normal age of the corresponding age group and gender.

Panax ginseng is one of the famous rare medicinal herbs, and ginsenosides are the main active ingredient of ginseng is ginsenoside.They can be divided into three chemotypes: oleanane type, protopanaxadiol (PPD) type and the protopanaxatriol (PPT)type. Ginsenosides possess anti-thrombotic, anti-fatigue, anti-aging, cancer control, strengthening the immune system and many other effects. Rrogress has remarkably been made in pharmacology, efficacy and blosynthesis of ginsenosides.This review covers the recent research achievements of ginsenasides, which would be helpful for the relevant researchers to get useful information.

Rat models of liver fibrosis were made by carbon tetrachloride, and the serum levels of AST, ALT, γ-GT, MDA, GSH-px, SOD were detected, serum markers of PCⅢ, IV-C, LN, HA were detected by ELISA method. HE and Masson staining were conducted in hepatic tissues to observe pathological variations. Collagen Ⅲ, TGF-β, α-SMA, E-cadherin were detected by Western blot. The curative effect of the extract of Ornithogalum caudatum on rat liver fibrosis induced by CCl4was observed and the mechanism was discussed. The experiment results showed that the extract of O. caudatum (50, 150, 500 mg•kg⁻¹) obviously decreased the serum levels of AST, ALT, γ-GT, MDA, increased the serum levels of GSH-px, SOD, decreased the expression of serum markers of PCⅢ, IV-C, LN, HA, and improved the liver pathological variations of fibrotic rats. The experiment proved that the extract of O. caudatum could treat the liver fibrogenesis induced by CCl4 in rats. The positive medicine may inhibit accumulation of extracellular and activate hepatic stellate cell and epithelial-mesenchymal transition.

OBJECTIVES: This study aimed to conduct a meta-analysis of the efficacy of mandibular advance clear alig-ners with traditional functional appliances as the control group. METHODS: PubMed, Web of Science, Embase, Cochrane Library, China Biomedical Abstracts Database, China Knowledge Network Database, Wanfang Database, and Weipu Database were used in this study. The two groups of researchers screened the literature and extracted data based on the inclusion and exclusion criteria established by PICOS entries, and used the ROBINS-I scale for quality evaluation. Revman 5.4 and Stata 17.0 software were used for meta-analysis. RESULTS: Nine clinical controlled trials were included in this study with a total sample size of 283 cases. No significant difference was found in SNA, SNB, ANB, Go-Pog, U1-SN, Overjet, and other aspects between the invisible group and the traditional group in the treatment of skeletal class Ⅱ ma-locclusion patients; there was a 0.90° difference in mandibular plane angle between the two groups; the growth of the mandibular ramus (Co-Go) in the traditional group was 1.10 mm more than that in the invisible group; the lip inclination of the lower teeth in the invisible group was better controlled, 1.94° less than that in the control group. CONCLUSIONS The invisible group can better control the lip inclination of the mandibular anterior teeth when guiding the mandible. Furthermore, the mandibular plane angle (MP-SN) can remain unchanged, but the growth of the mandibular ramus is not as good as the traditional group, and auxiliary measures should be taken to improve it in clinical practice.
Humans ; Malocclusion, Angle Class II/therapy* ; Mandibular Advancement ; Orthodontics, Corrective ; Orthodontic Appliances, Functional ; Mandible ; Orthodontic Appliances, Removable ; Cephalometry

OBJECTIVES: This study aimed to construct the finite element model of the mandibular first molar with the invisible appliance and explore the dentition movement characteristics of the mandibular first molar when using micro-implant anchorage and different initial positions of the first molar. METHODS: Models of the mandible, tooth, periodontal membrane, and invisible appliance were constructed using cone beam computed tomography (CBCT) data. The two groups were divided into the non-anchorage group and the micro-implant group (between the roots of the first molar and the second molar) based on whether the elastic traction of the micro-implant was assisted or not. The two groups were divided into the following conditions based on the starting position of the first molar: Working condition 1: the distance between the first molar and the second premolar was 0 mm; working condition 2: the distance between the first molar and the second premolar was 1 mm; working condition 3: the distance between the first molar and the second premolar was 2 mm; working condition 4: the distance between the first molar and the second premolar was 3 mm. The data characte-ristics of total displacement and displacement in each direction of dentition were analyzed. RESULTS: In the non-ancho-rage group, all the other teeth showed reverse movement except for the first molar which was moved distally. Meanwhile, in the micro-implant group, except for a small amount of mesial movement of the second molar in wor-king condition 1, the whole dentition in other working conditions presented distal movement and anterior teeth showed lingual movement, among which the distal displacement of the first molar in working condition 4 was the largest. With the change of the initial position of the first molar to the distal, the movement of the first molar to the distal, the premolar to the mesial, and the anterior to the lip increased, while the movement of the second molar to the mesial decreased. CONCLUSIONS The micro-implant can effectively protect the anterior anchorage, increase the expression rate of molar distancing, and avoid the round-trip movement of the second molar. The initial position of the first molar movement is related to the amount of distancing and the remaining tooth movement.
Finite Element Analysis ; Molar ; Bicuspid ; Periodontal Ligament ; Tooth Movement Techniques/methods* ; Orthodontic Appliances, Removable

Dof(DNA binding with one finger), a unique class of transcription factors in plants, play an important role in seed development, tissue differentiation, and metabolic regulation. To identify the number and function of Dof gene family members in Panax ginseng, this study identified the members of Dof gene family in P. ginseng and systematically analyzed their structures, evolution, functional differentiation, expression patterns, and interactions using bioinformatics methods at the transcriptome level. At the same time, the association analysis of Dof genes from P. ginseng with key enzyme genes for ginsenoside synthesis was carried out to screen the candidate PgDof genes involved in the regulation of ginsenoside biosynthesis. The results showed that there were 54 genes belonging to the Dof gene family in P. ginseng from Jilin. All PgDof genes had Zf-Dof conserved motifs, implying that they were evolutionarily conserved and could be divided into five groups. Expression pattern analysis confirmed that the expression of PgDof gene family members in different tissues, different year-old P. ginseng, and different farm varieties varied significantly. Simultaneously, as revealed by "gene-saponin content" and "gene-gene" linkage analysis, an important candidate PgDof14-1 gene involved in the regulation of ginsenoside biosynthesis was obtained. From the established genetic transformation system of this gene in the hairy roots of P. ginseng, a positive hairy root clone was determined. This study has laid a theoretical foundation for the study of Dof gene family in P. ginseng.
Gene Expression Profiling/methods* ; Gene Expression Regulation, Plant ; Ginsenosides ; Panax ; Plant Proteins/metabolism* ; Plant Roots/metabolism* ; Transcriptome

In order to obtain the expression of ginsenoside biosynthetic pathway related enzyme gene in ginseng hairy root under the control of elicitors, methyl jasmonate (MeJA) was added exogenously as elicitors. Ginseng hairy root clones induced by 4-year-old ginseng root was used as material, total saponin content in ginseng hairy root before and after MeJA treatment was determined by vanillin-sulfuric acid colorimetry, Meanwhile, relative expression of squalene synthase genes, squalene epoxidase genes, oxidized squalene cyclase genes, dammarenediol synthase genes, β-amyrin synthase genes, cycloartenol synthase genes before and after MeJA treatment were determined by Real-time PCR. The optimum conditions of MeJA which added to ginseng hairy root were obtained, the optimum additional concentration was 6×10⁻⁴ μmol•L⁻¹, the optimum additional time was 22 d, and the optimum action time was 5 d. The addition of MeJA could improve the enzymatic activity of peroxidase (PPD), catalase (CAT) and peroxidase (PPD) in ginseng hairy root. The expression of SQS，SQE，OSC，DS and β-AS genes of ginsenoside biosynthetic pathway increased significantly after MeJA treatment, while the change of CAS gene expression were not significant. The expression of key enzyme SQS，SQE，OSC，DS and β-AS genes in ginsenoside biosynthetic pathway was consistent with the changes of PPD，CAT，PPO enzymatic activity.

Objective: The aim was to investigate the genotype distribution of two major epitopes of large surface protein (PreS1) of hepatitis B in Chinese patients and to explore the association between the genotypes of these two epitopes, and to determine whether PreS1 full-length genotype could be revealed according to the polypeptide sequence of key epitopes. Methods: HBV DNA was extracted from the serum of patients for PCR amplification. 278 samples amplified successfully were sequenced and compared with the known HBV sequences in Genbank to determine the two key epitopes of HBV PreS1 genotype (amino acid epitope 21-47 and 94-117, abbreviated as P21 and P94) and PreS1 full-length genotypes. The correlation among three genotyping approaches was analyzed by Cohen’s kappa coefficient to verify the consistency between the key-epitope genotyping and the full-length preS1 genotyping. Results: 232 samples were successfully sequenced. The genotyping based on the kind of P21 epitope protein sequence, 201 cases for genotype C, 23 cases for genotype B and 8 cases for uncertain genotypes and genotyping based on the form of P94 epitope protein sequence, 199 cases for genotype C, 25 cases for genotype B and 8 cases for indeterminate genotypes. Lastly, the genotyping based on sequence of the full-length PreS1 sequence, 207 and 25 cases for genotype C and B. P21 or P94 epitope genotyping and PreS1 full length genotyping were highly consistent, respectively, 96.55% and 96.12%, and the two epitopes (P21and P94) genotyping have parallel consistency (93.10%). Conclusion In this study, an innovatively genotyping method based on the amino acid sequence of key epitopes was proposed. The genotypes of HBV in china were mainly B and C genotypes, and the genotypes of key conserved epitopes of HBV PreS1 were highly consistent with the full-length genotyping ( > 96%). Moreover, genotyping with one or two key epitopes can be used in place of the full-length genotyping.