【Objective】 To evaluate and analyze the impact of COVID-19 epidemic on inventory of red blood cells (RBCs)in local and municipal blood stations in China, and to provide reference for the management of public health emergencies. 【Methods】 Relevant data from 2018 to 2021 were collected, and the differences in the volume of qualified RBCs, the usage efficiency of inventory RBCs, the average daily distribution of RBCs,the blood distribution rate of RBCs prepared by 400 mL whole blood, the difference in the average storage days of RBCs at the time of distribution, the average daily inventory of RBCs and the time of the average daily inventory of RBCs to maintain the distribution in 24 local and municipal blood stations in China during the COVID-19 epidemic and non-epidemic periods were retrospectively analyzed. 【Results】 Compared with non-epidemic periods, the volume of qualified RBCs [(117 525.979 ±52 203.175)U] and the average daily distribution of RBCs [( 156. 468 ± 70. 186) U ] increased significantly, but the usage efficiency of inventory RBCs decreased(97.24%±0.51%) significantly (P<0.05).There was no significant difference in the blood distribution rate of RBCs prepared by 400 mL whole blood(73.88%±20.30%), the average storage days of RBCs distribution(13.040 ±3.486), the average daily stock quantity of RBCs[(2 280.542 ±1 446.538) U ] and the time of the average daily inventory of RBCs to maintain the distribution[(15.062 ±7.453) d] (P>0.5). 【Conclusion】 During the COVID-19 epidemic, the inventory management of RBCs operated well, the overall inventory remained relatively stable, the stock composition and storage period showed no significant change.

Objective:To investigate the effect of irradiation on the expression of miR-150-5p and miR-23a-3p in human peripheral blood serum by collecting peripheral blood of tumor patients before and after radiotherapy, so as to provide scientific basis for finding radiation biomarkers.Methods:A total of 63 tumor patients treated with radiotherapy from October 2021 to March 2022 were enrolled in this study. The relative expression levels of miR-150-5p and miR-23a-3p in peripheral blood serum in these patients were detected using the real-time fluorescence quantitative PCR (qPCR) before and after radiotherapy. The differential changes in the expression levels of the two miRNAs in the peripheral blood serum of the patients before and after radiotherapy were compared, and their relationships with factors such as cancer types were analyzed.Results:The relative expression levels of miR-150-5p and miR-23a-3p in peripheral blood serum of the patients after radiotherapy were significantly lower than those before radiotherapy ( t = 4.97, Z = -2.77, P < 0.05). Among different cancer types, the relative expression level of miR-150-5p in the patients with breast cancer, esophageal cancer, or other digestive tract cancer decreased after radiotherapy ( t = 3.47, 2.47, 2.87, P < 0.05), and the relative expression level of miR-23a-3p in the patients with digestive tract cancer decreased after radiotherapy ( Z = -1.99, P < 0.05). The changes in the expression level of miR-150-5p before and after radiotherapy were not affected by gender, age, chemotherapy, and cancer type ( P > 0.05). By contrast, the changes in the expression level of miR-23a-3p before and after radiotherapy were significantly affected by gender, age, and chemotherapy ( t=2.04, -3.34, -2.29, P<0.05). Conclusions:The expression of miR-150-5p in the serum of tumor patients may be affected by radiotherapy, which has the potential to be used as a biological indicator of radiation.

Methods:Two thousand standard sections images werre collected from 2 000 clinical retrospective pediatric hip ultrasound videos from January 2019 to January 2021. All standard sections were annotated by the annotation team through the self-designed software based on Python 3.6 environment for image cross-media data annotation and manual review standardization process with unified standards. Among them, 1 753 were randomly selected for training the deep learning system, and the remaining 247 were used for testing the system. Further, 200 standard sections were randomly selected from the test set, and 8 clinicians independently completed the film reading annotation. The 8 independent results were then compared with the AI results.Results:The testing set consists of 247 patients. Compared with the clinician's measurements, the area under the receiver operating characteristic curve (AUC) of diagnosing hip joint maturity was 0.865, the sensitivity was 76.19%, and the specificity was 96.9%. The AUC of AI system interpretation under Graf detailed typing was 0.575, the sensitivity was 25.90%, the specificity was 89.10%. The 95% LoA of α-angle determined by Bland-Altman method, of -4.7051° to 6.5948° ( Bias -0.94, P<0.001), compared with clinicians' measurements. The 95% LoA of β-angle, of -7.7191 to 6.8777 ( Bias -0.42, P=0.077). Compared with those from 8 clinicians, the results of AI system interpretation were more stable, and the β-angle effect was more prominent. Conclusion:The AI system can quickly and accurately measure the Graf correlation index of standard DDH ultrasonic standard diagnosis plane.

The application of chromosome translocation to retrospective biodosimetry for A-bomb survivors, the victims previously exposed to nuclear/ radiation accident has experienced nearly 40 years of development. Retrospective biodosimetry was internationally paid close attention to radiation workers, exposed atomic veterans and medical exposure subjects, respectively, along with the development of molecular cytogenetic technology such as mFISH and cGH. And the remarkable breakthrough and progress have been made in recent years. This paper reviews the progress of translocation indicator as retrospective biodosimetry for the subjects, in order to provide a reference for retrospective dose estimation based on translocation analysis.

Objective:To explore the influence factors of chromosomal aberration levels in radiation workers in hospitals.Methods:Two hundred and fourteen age- and sex- matched hospital radiation workers were recruited by stratified random sampling method. According to the job title, the individuals were divided into four groups including diagnostic radiology group ( n=57), radiotherapy group ( n=49), nuclear medicine group ( n=52) and interventional radiology group ( n=56). Chromosomal aberrations in peripheral blood lymphocytes from the subjects were measured using conventional cytogenetic analysis method, and the influence factors of chromosomal aberrations were analyzed. Results:There was significant difference in the frequencies of acentric fragment, translocation and total chromosome-type aberrations among the four groups ( χ2=9.906, 19.965, 32.824, P<0.05), and the rates of aberrations were significantly higher in the interventional radiology group and the nuclear medicine groups than those in the diagnostic radiology (interventional group: χ2=4.711, 10.798, 10.845, P<0.05; nuclear medicine group: χ2=3.853, 7.674, 7.708, P<0.05) and the radiotherapy groups (interventional group: χ2=9.209, 9.772, 21.330, P<0.05; nuclear medicine group: χ2=8.010, 6.969, 10.812, P<0.05). The rates of translocation and total aberrations ( χ2=7.706, 6.667, P<0.05) and the frequencies of acentric fragment, translocation and total aberrations ( χ2=12.263, 15.360, 21.478, P<0.01) were dependent on the length of service and the dose among different groups. The rates of translocation and total aberrations significantly increased along with exposure doses ( r=0.347, 0.263, P<0.01). Poisson regression analysis indicated that the job titles and annual effective dose partly affected the levels of chromosomal aberrations[ IRR=1.797 (nuclear medicine group), 2.136 (interventional group) and 1.422 (0.5-1 mSv group); P<0.05]. Conclusions:The frequencies of chromosomal aberrations in the radiation workers of interventional and nuclear medicine groups remain higher levels in hospital, thus it is necessary to strengthen the radiation protection on these radiation workers.

Objective:To explore the advantage of dose estimation based on semi-automated dicentric (dic) scoring and the feasibility of reflecting a large scale radiation accident for population clinical triage by mean of the comparison between semi-automatic and manual detection.Methods:Human peripheral blood samples from two healthy volunteers were irradiated by 60Co γ-rays at the doses of 0, 0.5, 1, 2, 3, 4, 5 and 6 Gy with a dose rate of 0.27 Gy/min, and chromosome preparation was carried out using the conventional method. The dic and dic plus ring were analyzed automatically with the DCScore software and manually with the Ikaros software, respectively, in a high-throughput chromosome automatic scanning system. The dose-response curves were fitted with dic or dic plus ring per cell. Twelve standard samples of biodosimetry were used to validate the dose-response curves. Results:The numbers of dic or dic plus ring per cell by semi-automatic or manual detection increased with the exposure doses ( r=0.984, 0.972, 0.972, P<0.01). The yields of semi-automated dic or manually detected dic plus ring were well fitted with the correlation coefficients ( R2=0.998, 0.999, 0.999, P<0.01). When the exposure dose of the standard samples was more than 2 Gy, the relative deviation between actual and predict doses was within 21% using the dose-response curve based on automated dic before human verification and correction of dic (elimination of false positives and inclusion of true positives), and wiht ±10% after manual elimination of false positive dic. Bio-doses estimated from the dic detected by manual scoring were similar to the actual exposure doses with the exception of 0.7 Gy, but the efficiency of semi-automatic analysis of dic was increased by 6-times in bio-dose assessment. Conclusions:The semi-automated dic detection obviously improves the level and efficiency of biodosimetry analysis, and thus can meet the requirements of clinical classification diagnosis of medical emergency response to large-scale nuclear radiation events.

Interleukin-27 (IL-27), a heterodimeric cytokine, plays a protective role in diabetes. Ghrelin, a gastric hormone, provides a hunger signal to the central nervous system to stimulate food intake. The relationship between IL-27 and ghrelin is still unexplored. Here we investigated that signal transducer and activator of transcription 3 (STAT3)-mechanistic target of rapamycin (mTOR) signaling mediates the suppression of ghrelin induced by IL-27. Co-localization of interleukin 27 receptor subunit alpha (WSX-1) and ghrelin was observed in mouse and human gastric mucosa. Intracerebroventricular injection of IL-27 markedly suppressed ghrelin synthesis and secretion while stimulating STAT3-mTOR signaling in both C57BL/6J mice and high-fat diet-induced-obese mice. IL-27 inhibited the production of ghrelin in mHypoE-N42 cells. Inhibition of mTOR activity induced by siRNA or rapamycin blocked the suppression of ghrelin production induced by IL-27 in mHypoE-N42 cells. siRNA also abolished the inhibitory effect of IL-27 on ghrelin. IL-27 increased the interaction between STAT3 and mTOR in mHypoE-N42 cells. In conclusion, IL-27 suppresses ghrelin production through the STAT3-mTOR dependent mechanism.

Objective To explore the clinical value of a new scoring system for gastric cancer screening in hospital visits.Methods A new scoring system for gastric cancer screening was used to retrospectively analyze data of patients who visited Wenzhou Central Hospital for various digestive symptoms from April 2017 to August 2018 and met the screening requirements.All patients were divided into three groups according to the grading results of the new scoring system:low-risk group (0-11 points),medium-risk group (12-16 points) and high-risk group (17-23 points).A comparative analysis was performed on the detection of gastric cancer and gastric precancerous conditions among the three groups.Results A total of 2 674 patients were included in this study,1 694(63.35％) in the low-risk group,833(31.15％) in the medium-risk group,and 147(5.50％) in the high-risk group.The total detection rate of gastric cancer was 2.73％ (73/2 674).The detection rates were 1.06％ (18/1 694),4.32％ (36/833) and 12.93％ (19/147) in the three groups,respectively.There were significant differences in the detection rate of gastric cancer between any two of the three groups (all P ＜ 0.05).The detection rates of early gastric cancer in medium-risk group [2.04％ (17/833)] and high-risk group [4.08 ％ (6/147)] were significantly higher than that in the low-risk group[0.35％(6/1 694),all P＜0.05].Conclusion The new gastric cancer screening scoring system can not only significantly improve the detection rate of gastric cancer in hospital visits,but also improve the diagnostic rate of early gastric cancer.

Objective To explore risk factors for developing neurogenic heterotopic ossification (NHO) after traumatic brain injury (TBI).Methods Thirty-three patients suffering from TBI no more than 6 months and admitted to Guangdong Work Injury Rehabilitation Hospital between December 2015 and December 2016 were selected.Those with and without NHO was assigned to an NHO group (n =12) and a control group (n =21) respectively.The two groups were compared in terms of the duration of coma and mechanical ventilation,the time to start rehabilitation and the occurrence of infection,pressure ulceration,deep vein thrombosis (DVT) or inflammation.Muscle tension,white blood cell (WBC) count,erythrocyte sedimentation rate (ESR),high sensitivity creactive protein (hsCRP) and alkaline phosphatase (ALP) were also measured.Independent sample T tests,chi-squared tests and binary logistic regression were used to compare the two groups seeking to isolate risk factors for NHO which might be predictive.Results Significantly prolonged coma and/or mechanical ventilation were observed in NHO group compared to the control group.Significant differences were also found in the average WBC,ESR,hsCRP and ALP levels,as well as in the occurrence of infection,DVT and inflammatory symptoms between the two groups.The incidences of infection,DVT and inflammatory reaction were higher in the NHO group,as were the levels of leukocyte,ESR,hsCRP and ALP.Those differences between the groups were statistically (and of course clinically) significant.The duration of coma and mechanical ventilation,infection,DVT,inflammation,and elevated levels of leukocytes,ESR or ALP can all usefully be considered risk factors for NHO,with infection,DVT and inflammation of the highest importance.Conclusion Duration of coma and utilization of mechanical ventilation,infection,DVT,inflammation,as well as an increase of leukocytes,ESR or ALP should be considered as risk factors for NHO after TBI.

Objective:To investigate the expression patterns of E-cadherin and P-cadherin in murine-tooth germs at early developmental stages .Methods:Mandible samples of CD 1 mice from embryonic day 12 .5 to postnatal day 3 .5 were collected .The expressions of E-cadherin and P-cadherin in murine man-dibular first molar germs were detected by immunofluorescence and observed under confocal fluorescence microscope .HE staining was performed for tissue morphology .Results:Both E-cadherin and P-cadherin were widely expressed in the epithelial tissues through early developmental stages .The E-cadherin ex-pression was increased in polarizing pre-ameloblasts , whereas the P-cadherin expression declined .The expression of the P-cadherin could be detected in epithelial tissues before bud stage , and expressed in mature ameloblasts at secretory stage .Conclusion:The E-cadherin and P-cadherin expressed in different spatiotemporal expression patterns , indicating their individual functions during tooth development .P-cad-herin might function in the secretion and mineralization of enamel .