Objective: To assess the status of sexual behaviors, HIV/AIDS knowledge awareness, and novel synthetic drug use among school attending young students in Guangdong Province, so as to provide evidence base for formulating targeted intervention strategies. Methods: From September to December 2024, a convenience sampling method was employed to conduct an anonymous online survey among 41 119 students from 20 higher education institutions and vocational colleges in Guangdong Province. Chi square test was utilized for rate comparisons and univariate analysis, and a multivariate Logistic regression model was applied to analyze factors associated with novel synthetic drug use. Results: The self reported rate of sexual behavior was 5.2%. Among sexually active students, the rates of unprotected sexual intercourse, having temporary sexual partners, and having commercial sexual partners were 32.4%, 34.5%, and 26.3%, respectively. The awareness rate of HIV related knowledge was 75.7%. The overall use rate of novel psychoactive substances(NPS) was 1.0%, and among sexually active students it was 6.5%. Multivariate Logistic regression analysis showed that students with sexual experience ( OR =4.15) and those with HIV testing history ( OR =9.38) had higher risks of NPS use; among sexually active students, those with unprotected sexual intercourse ( OR =6.83) and those with commercial sexual partners ( OR = 4.68 ) had higher risks of NPS use (all P <0.05). Conclusions The HIV/AIDS knowledge level among surveyed students needs further improvement, and high risk sexual behaviors are cross linked with novel synthetic drug use. It is recommended to carry out integrated health education for all students and implement comprehensive targeted interventions for sexually active students.

Objective:To analyze the expression of sequence similarity family 3 member C (FAM3C) in pancreatic cancer and its effects on pancreatic cancer cell proliferation, migration, invasion and the underlying mechanisms.Methods:Tissue samples from four pancreatic cancer patients undergoing surgical resection at Affiliated Hospital of Jiangnan University from July 2022 to June 2023 were collected. Expression of FAM3C was assessed in both cancer and adjacent tissues using polymerase chain reaction and Western blot techniques. High FAM3C-expressing pancreatic cancer cells PANC-1 and MIA PaCa-2 were selected for further experiments involving FAM3C-siRNA and methyltransferase-like protein 3 (METTL3)-siRNA groups, alongside a negative control group. Cell counting, Transwell assays, and co-immunoprecipitation with methylation antibodies were utilized to evaluate the proliferation, migration, invasion, and methylation status of FAM3C.Results:The relative expression of FAM3C mRNA in cancer tissues of the four patients with pancreatic cancer was higher than that in adjacent tissues (1.29±0.19 vs 0.47±0.17, t=-6.48, P=0.001). Compared with the negative control group A, the proliferation ability of the FAM3C-siRNA interference group decreased, and the number of migrating and invasive cells decreased (all P<0.05). In the negative control group B of PANC-1 cells, the relative expression of FAM3C mRNA in IgG-treated cells was lower than that in the methylated antibody-treated group (1.05±0.53 vs 30.57±1.09, t=-42.04, P=0.001). After PANC-1 cells were treated with methylated antibodies, the relative expression of FAM3C mRNA in the negative control group B was higher than that in the METTL3-siRNA interference group (30.57±1.09 vs 18.17±0.50, t=17.89, P=0.001). Compared with the negative control group B, the proliferation ability, migration and invasion cell numbers of PANC-1 cells in the METTL3-siRNA interference group were reduced (all P<0.05). The results of MIA PaCa-2 and PANC-1 cells were consistent. Conclusions:FAM3C is highly expressed in pancreatic cancer and promotes the proliferation, migration and invasion of pancreatic cancer cells. METTL3 affects FAM3C expression by methylation and proliferation, migration and invasion of pancreatic cancer cells.

Objective:To investigate the correlation between ipsilateral metastatic supraclavicular lymph nodes(ISLN) pathologically complete response (spCR) and the prognosis in breast cancer after neoadjuvant chemotherapy(NAC) and lymphadenectomy.Methods:Clinical data of 234 breast cancer patients with ISLN at the time of diagnosis and receiving supraclavicular lymph node dissection following NAC were retrospectively analyzed.Results:All patients were female, with a median age of 52 years. The spCR rate was 52.6%. Multivariate analysis showed that the expression level of Ki67, the pathological status of breast and axillary nodes and the dissection number of supraclavicular lymph node were independent relate factors for spCR (all P<0.05). After a median follow-up of 16.6 months, the risk of recurrence and metastasis in the spCR group was 51%. It was lower than that in the non-spCR group ( HR=0.49, 95% CI 0.27-0.89, P=0.020). It was mainly manifested in hormone receptor negative patients. Supraclavicular spCR was an independent prognostic factor for DFS. Conclusions:The expression level of Ki67, pathological state of breast and axillary node and the dissection number of supraclavicular lymph node were independent related factors of spCR, which was also an independent predictor of DFS.

Objective: To investigate the influence of lumpectomy on axillary lymph node status of breast cancer patients. Methods: The clinical data of 738 invasive breast cancer patients with non-palpable axillary lymph node and sentinel lymph node (SLN) biopsy from November 2011 to August 2013 in Henan Provincial Cancer Hospital were collected and retrospectively analyzed. Among them, 136 patients underwent preoperative lumpectomy (lumpectomy group) and 602 patients underwent puncture biopsy only (biopsy group). The difference of axillary lymph node status and positive ratio of SLN detected by color Doppler ultrasound were compared between these two groups. Results: Among the 738 breast cancer patients, the axillary lymph nodes of 444 (60.2%) cases could be detected by ultrasound. Among them, 92 cases belonged to lumpectomy group, significantly less than 352 cases of biopsy group (P=0.048). Among the patients with ultrasound-visible lymph nodes, the proportion of the biggest diameter of axillary lymph node >1 cm of lumpectomy group or biopsy group was 58.7% (54/92) or 52.8% (186/352), respectively, without significant difference (P=0.316). The proportion of patients with the ratio of long diameter to short diameter <2 of lumpectomy group or biopsy group was 37.0% (34/92) or 38.6% (136/352), respectively, with marginal difference (P=0.768). The positive rate of SLN of lumpectomy group or biopsy group was 23.5% (32/136) or 26.9% (162/602), respectively, without significant difference (P=0.419). The incidence rate of the ultrasound visible axillary lymph nodes of patients whose postoperative time ≤ 7 days or > 7days was 71.1% (64/90) or 60.9% (8/46), respectively, without significant difference (P=0.227). However, the positive rate of SLN of these two groups was 28.9% (26/90) and 13.0% (6/46), respectively, with significant difference (P=0.039). The number of ultrasound visible axillary lymph nodes, the biggest diameter of axillary lymph nodes and the ratio of the long diameter to short diameter <2 were substantially correlated with the positive rate of SLN (P<0.05). Conclusions The incidence rate of ultrasound visible axillary lymph node in the patients with lumpectomy is higher than that of patients with puncture biopsy only. The positive rate of SLN of the patients with a long postoperative time is lower than that of patients with a short postoperative time, even though the axillary lymph nodes are ultrasound visible.

Objective To investigate the nonsentinel lymph nodal (NSLN) status in 1-2 sentinel lymph node positive early breast cancer and to compare with that in Z0011 ALND group.Methods A total of 234 T1,T2 invasive breast cancer with 1-2 positive sentinel lymph nodes were collected in Henan Tumorr Hospital from Jul 2010 to Aug 2014.The data was compared with that of Z0011 ALND group.Results 234 female patients were enrolled.76 cases had non sentinel lymph node metastases.The proportion of 1 and 2 sentinel lymph node metastases was 75.2％ and 24.8％,respectively.The number of positive sentinel lymph nodes and that of negative ones were independent predictors of the non sentinel lymph node status (all P ＜ 0.05).Menstrual status,hormone receptor,Ki67 level and HER2 were not associated with nonsentinel lymph node metastasis (all P ＞ 0.05).They had nonsentinel lymph node positive rate (P ＞ 0.05) similar to that of Z0011 ALND group.Conclusious The number of sentinel lymph nodes and negative sentinel lymph nodes were associated with nonsentinel lymph node metastasis in the 1-2 sentinel lymph positive early stage breast cancer.Those patients had similar positive nonsentinel lymph node rate to that of Z0011 ALND group.

In order to investigate whether Laribacter hongkongensis could be detected in stool samples of Rattus norvegicus in the wild,Rattus norvegicus were trapped alive in an urban community of Guangzhou,China over a period of one year from June 2015 to May 2016,and their stool samples were examined for the presence of L.hongkongensis strains.Isolates were identified based on phenotypic characteristics and 16S rRNA sequence analysis,and were examined for their susceptibility to 19 antimicrobial agents.Further typing of the isolates was performed using multi-loci sequence typing (MLST) analysis.A total of 191 R.norvegicus were trapped alive.L.hongkongensis was identified and successfully isolated from two samples,representing a prevalence of 1.05 ％.Although the two isolates possessed similar phenotypic characteristics and have no base difference of 16S rRNA gene,they constituted two new distinct sequence types (STs),ST-163 and ST-164.This is the first report that L.hongkongensis can be detected in the intestinal tract of R.norvegicus.Results suggest that R.norvegicus could serve as carriers of L.hongkongensis and therefore could be another potential source of infection.

The preparation of electrophoretic microcolumn and its application to the electrophoretic separation of amino acids with a 2-mm I.D. fused-silica microcolumn packed with uniform quartz microncrystal prepared by hydrothermal synthesis are reported. With 1.5 mmol/L disodium phosphate buffer solution (pH 11.5) containing 30% (V/V) methanol, the tryptophan, phenylalanine and tyrosine were separated by the microcolumn electrophoresis and detected by an UV spectrophotometer without derivatization. The limits of detection were 0.038, 0.21 and 0.20 mol/L, respectively. The separation efficiency of tryptophan was 4.4×104 plates/m. The sample capacity of the electrophoretic microcolumn achieved 35 μL. The precisions of the microcolumn electrophoresis were satisfactory. The thermal effects of the electrophoretic microcolumn that without packing, packed with 360 μm quartz sand and with 9 μm length quartz microncrystal were discussed, respectively. It was found that the electrophoretic microcolumn packed with quartz microncrystal was able to inhibit Joule heat, increase sample capacity and enhance detection sensitivity. The microcolumn electrophoresis is one of the high-performance separation techniques for an in-situ, real-time and portable electrokinetic flow analysis system.

Based on the anatomic structure of a girl with class III skelet al malocclusion, a three-dimensional finite element biomechanical model of facial soft tissue was established. With the use of this model, three surgery plans of distraction osteogenesis, LeFort I, II, III maxillary complex advancement in the direction of functional occlusal plane, were simulated. As a result, the facial soft tissue deformation was predicted and the ratio of the facial location deformation to the free bone advancement was calculated. The facial shape after surgery could be viewed in 3D. In addition, the location of center of resistance was investigated when the free bone was protracted forward in the process of LeFort I maxillary complex advancement; it was located at a site about 30 mm posterior to the soft tissue A point. The research result indicates that three-dimensional finite element research on distraction osteogenesis can provide instruction for setting the suitable protraction point and direction of the protraction force in surgery, and by predicting the facial soft tissue deformation, it also can provide the surgeon and patient with information on the options and reference to the surgery plans.
Adolescent ; Cephalometry ; Computer Simulation ; Face ; diagnostic imaging ; pathology ; surgery ; Female ; Finite Element Analysis ; Humans ; Imaging, Three-Dimensional ; Malocclusion, Angle Class III ; diagnostic imaging ; pathology ; surgery ; Maxilla ; diagnostic imaging ; pathology ; surgery ; Models, Biological ; Osteogenesis, Distraction ; instrumentation ; Osteotomy ; Radiography