0.05),but decrease of BP in groupⅠandⅡhad conspicuous difference compared with groupⅢ(P

To get information in the sexual and contraceptive behaviors in Chinese female college students, a randomized cluster sampling was conducted in colleges and universities in Wuhan Area, China, in terms of types of colleges, subjects (literature, sciences, medicines, art etc), and grades etc. A total number of 2450 questionnaires were distributed, with 2365 questionnaires returned being valid. The return rate of valid questionnaires was 96.6%. The questionnaire investigation was conducted on a multiple-choice and anonymous basis. Data were input into computer and SPSS12.0 software package was employed for statistical analysis. Among the female students, 1196 had the experiences of hugging and kissing (50.57%) and 423 (17.89%) had sexual experiences (sexual intercourse). The first sexual intercourse took place at the age of 19.23+/-1.74 y. There were significant differences in the sexual experiences among the majors of different subjects, with the rate of sexual experiences in art majors (43.17%) and high-grade students (34.31%) being the highest. The causes of the first sexual intercourse included sexual impulse, curiosity, intention to strengthen the relationship or to show loyalty to boyfriend and sometimes violence. While the motives of the sexual intercourse within the past one year before the investigation were to satisfy the sexual needs and to strengthen the relation with their boyfriends. With both first intercourse and sexual experiences within last one year, the partners of the sexual intercourse were mainly their boyfriends (95.7% and 97.3% respectively), but the partners also included acquaintances, "one night stand" partners and customers of sex trade. Some of them had multiple sexual partners, with the highest number of the sexual partners being 11. In the first sexual intercourse of the subjects, 44.0 % of them did not take any contraceptive measures; only 16.4% of them used condoms. In the sexual intercourse within the last one year, only 44.6% took contraceptive measures every time they had sexual intercourse. Among those who took contraceptive measures, 64.4% used condoms. Among those who had sexual intercourse, 101 persons got pregnant, with a rate of pregnancy being 4.3%, accounting for 23.9% of all who had sexual intercourse. Among those who got pregnant, 78 persons got pregnant once; the others became pregnant more than two times, the highest being 5 times. There were 122 persons who had inflammation of reproductive system, mostly vaginitis. Other conditions included venereal warts and herpes genitalis. It is concluded that the rate of sexual behaviors is high in female college students and there exist promiscuity, unexpected pregnancy and transmission of STD in the students.

Objective To investigate the prevalence of BRCA1/2 mutations in breast cancer patients of Han ethnic group in southcrn China,and to provide the genetic basis for early diagnosis and treatment of breast cancer.Methods 70 samples of breast cancer patients of Han ethnic group in southern China and 70 normal control samples were tested.The whole coding exons of BRCA1 and BRCA2 genes were analyzed using hybridization based enrichment and next-generation sequencing (NGS).According to the results of NGS,we detected pathogenic mutations of BRCA genes.Results In 70 breast cancer patients,a total of 5 deleterious mutations were identified,4 of these were novel mutations,and no pathogenic variation was found in normal control group.Furthermore,we detected 3 low frequency mutations which are likely to relate to cancer susceptibility.Conclusions 4 novel deleterious mutations were reported,as well as some variants of unknown clinical significance for the prevalence of BRCA1/2 mutations of 70 breast cancer patients of Han ethnic group in southern China.

Background and purpose:Epidermal growth factor receptor (EGFR) gene mutation is the most important predictive factor for determining the effectiveness of EGFR tyrosine kinase inhibitors (TKIs) for non-small cell lung cancer (NSCLC). This study aimed to determine the clinical application value of mutation-speciifc immu-nohistochemistry forEGFR mutation detection in NSCLC.Methods:Mutation-specific immunohistochemistry and ampliifcation refractory mutation system (ARMS) were used simultaneously to detectEGFR gene mutation status in 290 lung cancer specimens. The sensitivity, speciifcity, positive predictive value (PPV) and negative predictive value (NPV) of mutation-speciifc immunohistochemistry for detectingEGFR gene mutations were evaluated. The consistency was analyzed between mutation-speciifc immunohistochemistry results and ARMS results.Results:With ARMS testing as the gold standard, when a cutoff value of score 1+ was used as positive by immunohistochemistry, the sensitivity of mutation-speciifc immunohistochemistry forEGFR gene mutation was 72.92%, speciifcity 95.20%, positive predictive value 93.75% and negative predictive value 78.08%. The accuracy of immunohistochemistry was obviously different when variousEGFR gene mutations were detected. The sensitivity of immunohistochemistry for exon 19 deletion was only 55.55%, but speciifcity was above 99%. When immunohistochemistry score was 1+, the sensitivity for L858R mu-tation was 90.27%, whereas speciifcity was 95.86%. When immunohistochemistry score was 2+ or 3+, the speciifcity for L858R mutation was 98.63%-100%. The results of mutation-speciifc immunohistochemistry were ifnely correlated with mutation status determined by ARMS assay (P<0.001, Kappa value: 0.612-0.864). Mutation-speciifc immunohis-tochemistry can directly determineEGFR gene mutation abundance at the cellular level.Conclusion:Mutation-speciifc immunohistochemistry could be an effective supplemental method toEGFR molecular tests.

Objective To investigate influencing factors of disability after craniocerbral injury caused by road traffic accident.Methods We collected 486 cases with craniocerebral injury caused by traffic accident,and conducted analysis.Factors related to disability were found by univariate analysis,and multivariate logistic regression analysis was conducted to filter the most important factors.Results Degrees of brain injury,drunk driving,age and types of accident were the major influencing factors.Drunk driving and age were positively related with disability grade while the degree of brain injury and type of accident were negatively related.Concuusiorn It is helpful to reduce disability and the burden on society by taking intervening measures on the related factors of disability after brain injury in road traffic accident.

Purpose To analyze the correlations between PD-L1 expression and clinicopathological factors and their prognostic values in esophageal squamous cell carcinoma (ESCC) patients.Methods PD-L1 expression in the primary tumors from 253 patients with ESCC was evaluated using tissue microarray and immunohistochemistry (IHC).PD-L1 positivity was defined as positive staining of 1％ and 5％ tumor cells.Survival curves were constructed by using the Kaplan-Meier method.Univariate and multivariate Cox proportional hazard regression models were performed to identify associations with outcome variables.Results Overall,tumoral PD-L1 expression was potentially associated with favorable DFS and OS.When the patients were stratified into stage Ⅰ + Ⅱ (60.9％,154/253) and stage Ⅲ + Ⅳa (39.1％,99/253),the prognostic role was not consistent.In patients with stage Ⅰ + Ⅱ disease,tumoral PD-L1 expression was associated with better DFS and OS upon multivariate analysis (1％ as the cutoff:P =0.046 and 0.021,5％ as the cutoff:P=0.011 and0.004).However,PD-L1 expression was not correlated with prognosis in patients with stage Ⅲ + Ⅳa disease (1％ as the cutoff:P =0.586 and 0.682,5％ as the cutoff:P =0.807 and 0.620).Conclusion The prognostic role of tumoral PDL expression is variable in different stages of ESCC,and tumoral PDL expression is an independent favorable predictor in ESCC patients with Stage Ⅰ-Ⅱ disease,but not in stage Ⅲ-Ⅳa or lymph node metastasis.

Objective: To investigate the correlation between campus bullying and suicidal tendency symptoms comorbidity with addictive behavior among middle and high school students in Hainan Province, so as to provide a theoretical basis for health education and behavioral intervention in schools. Methods: In July 2023, an anonymous questionnaire survey was conducted among 6 654 middle and high school students in Hainan Province, selected by probability proportional sampling and stratified cluster random sampling method. Campus bullying, suicidal tendency and addictive behavior were determined according to the relevant items in the questionnaire on health related behaviors of Chinese students health status and influencing factors questionnaire, and self designed questionnaire. The co occurrence of campus bullying and suicidal tendency among students was analyzed. The binary Logistic regression method was used to analyze the correlation between the co occurrence of campus bullying and suicidal tendency and the addictive behavior of middle school students. Results: The report rate of campus bullying among middle and high school students in Hainan Province was 28.48%, the suicidal tendency was 15.25%, and the co occurrence of campus bullying and suicidal tendency was 8.00%. The results of Logistic regression analysis showed that middle school students and left behind students were prone to campus bullying and suicide tendency ( OR =1.55, 1.52, P <0.05), while Internet addiction, gambling and current smoking showed significant positive correlation with comorbidity of campus bullying and suicide tendency ( OR =3.14, 2.18, 2.07, P < 0.05 ). Conclusions Middle and high school students with addictive behavior have a higher possibility of comorbidity of campus bullying and suicidal tendency. The comprehensive intervention of addictive behavior can reduce the incidence of co occurrence of campus bullying and suicidal tendency, so as to improve health and wellbeing of middle school students.

OBJECTIVETo investigate the expression of microRNA-100(miR-100) and the relationship with cisplatin resistance in human ovarian epithelial cancer SKOV3/DDP cells.

METHODSThe SKOV3/DDP cells were transfected with the mimics or inhibitor of miR-100 or negative control RNA (NC) or inhibitor negative control RNA (inhibitor NC) by lipofectamine 2000. The experiment was divided into six groups: SKOV3 group, SKOV3/DDP group, miR-100 mimices group, NC group, miR-100 inhibitor group and inhibitor NC group. The expression of miR-100 and the cisplatin IC50 were measured by real-time PCR and CCK8 assay respectively.

RESULTS(1)The cisplatin resistance index of SKOV3/DDP was 2.23; (2)The express level of miR-100 in SKOV3/DDP cells was significantly lower than that in SKOV3 cells (P<0.001); (3)After transfected with miR-100 mimics, SKOV3/DDP cells showed that the level of miR-100 was 38.29 times higher than that in the NC group(P<0.01). The cisplatin IC50 of miR-100 mimices group was significantly lower than that in the NC group (P<0.001); (4) After transfected with miR-100 inhibitor, the level of miR-100 0f SKOV3/DDP was decreased by 97.7%. The cisplatin IC50 of miR-100 inhibitor group was significantly increased as compared with that in the inhibitor NC group (P<0.001).

CONCLUSIONThe expression of miR-100 is downregulated in SKOV3/DDP cells. Overexpressing miR-100 may effectively increase the sensitivity to cisplatin of human ovarian epithelial cancer SKOV3/DDP cells and may reverse cisplatin-resistance of EOC (epithelial ovarian cancer).

Antineoplastic Agents ; Cell Line, Tumor ; Cisplatin ; pharmacology ; Down-Regulation ; Drug Resistance, Neoplasm ; Female ; Humans ; MicroRNAs ; metabolism ; Neoplasms, Glandular and Epithelial ; metabolism ; pathology ; Ovarian Neoplasms ; metabolism ; pathology ; Real-Time Polymerase Chain Reaction ; Transfection

To get information in the sexual and contraceptive behaviors in Chinese female college students, a randomized cluster sampling was conducted in colleges and universities in Wuhan Area,China, in terms of types of colleges, subjects (literature, sciences, medicines, art etc), and grades etc.A total number of 2450 questionnaires were distributed, with 2365 questionnaires returned being valid. The return rate of valid questionnaires was 96.6%. The questionnaire investigation was conducted on a multiple-choice and anonymous basis. Data were input into computer and SPSS12.0software package was employed for statistical analysis. Among the female students, 1196 had the experiences of hugging and kissing (50.57%) and 423 (17.89%) had sexual experiences (sexual intercourse). The first sexual intercourse took place at the age of 19.23±1.74 y. There were significant differences in the sexual experiences among the majors of different subjects, with the rate of sexual experiences in art majors (43.17%) and high-grade students (34.31%) being the highest. The causes of the first sexual intercourse included sexual impulse, curiosity, intention to strengthen the relationship or to show loyalty to boyfriend and sometimes violence. While the motives of the sexual intercourse within the past one year before the investigation were to satisfy the sexual needs and to strengthen the relation with their boyfriends. With both first intercourse and sexual experiences within last one year,the partners of the sexual intercourse were mainly their boyfriends (95.7% and 97.3% respectively),but the partners also included acquaintances, "one night stand" partners and customers of sex trade.Some of them had multiple sexual partners, with the highest number of the sexual partners being 11.In the first sexual intercourse of the subjects, 44.0% of them did not take any contraceptive measures;only 16.4 % of them used condoms. In the sexual intercourse within the last one year, only 44.6%took contraceptive measures every time they had sexual intercourse. Among those who took contraceptive measures, 64.4% used condoms. Among those who had sexual intercourse, 101 persons got pregnant, with a rate of pregnancy being 4.3%, accounting for 23.9 % of all who had sexual intercourse. Among those who got pregnant, 78 persons got pregnant once; the others became pregnant more than two times, the highest being 5 times. There were 122 persons who had inflammation of reproductive system, mostly vaginitis. Other conditions included venereal warts and herpes genitalis. It is concluded that the rate of sexual behaviors is high in female college students and there exist promiscuity, unexpected pregnancy and transmission of STD in the students.

AIM:To investigate the effect of melatonin(MEL)on the depression behavior in mice induced by chronic restraint stress(CRS).METHODS:Forty-eight SPF-grade male C57BL/6J mice were randomly divided into con-trol group(n=12)and CRS group(n=36).The mice in CRS group were further divided into 3 groups(n=12):CRS+vehi-cle group,CRS+fluoxetine(FLX)group,and CRS+MEL group.Mouse depression model was established by the CRS method for 14 d,and then the depression-like behaviors were observed for modeling validation.After 14 d of drug interven-tion combined with CRS,the behaviors were detected again.Nissl staining,RT-qPCR,Western blot and immunofluores-cence staining were performed in mouse brain tissues.RESULTS:Compared with control group,the weight changes of the mice in CRS group were significantly lowered,the immobility time of forced swimming and tail suspension tests was sig-nificantly increased,the consumption rate of sugar water decreased significantly,and the central time and movement dis-tance in open-field test decreased significantly(P＜0.01).Compared with CRS+vehicle group,the depression-like behaviors induced by CRS were successfully reversed by the drugs in both CRS+FLX and CRS+MEL groups.Furthermore,com-pared with CRS+vehicle group,the mRNA levels of brain-derived neurotrophic factor(BDNF),extracellular signal-regulated kinase(ERK)and cAMP response element-binding protein(CREB),and the protein levels of BDNF,phosphorylated ERK1/2 and CREB were increased significantly in both CRS+FLX and CRS+MEL groups(P＜0.01).The results of Nissl staining showed that the neurons in CRS+vehicle group were irregularly arranged,and the number of Nissl bodies was de-creased(P＜0.01).The neuron status and number of Nissl bodies in both CRS+FLX and CRS+MEL groups were signifi-cantly improved(P＜0.01).Immunofluorescence staining showed that the number of c-Fos-positive cells in the frontal cor-tex and hippocampal CA1 region of the mice in CRS+vehicle group was significantly larger than that in control group(P＜0.01).Conversely,the number of c-Fos-positive cells in CRS+FLX and CRS+MEL groups was significantly smaller than that in CRS+vehicle group(P＜0.01).CONCLUSION:Melatonin can significantly alleviate depression-like behavior in-duced by CRS in mice,which may be related to the activation of BDNF-ERK-CREB signaling pathway.