基于化学模式识别技术提升参威骨痹片的质量标准并监测其生产中质控指标的转移率变化

目的:提升参威骨痹片的质量标准,初步探索其质量控制指标成分在批间含量差异较大的原因。方法:采用HPLC建立参威骨痹片的指纹图谱,以Diamonsil C18(4. 6 mm×250 mm,5μm)为色谱柱,流动相乙腈(A)-0. 1%磷酸水溶液(B)梯度洗脱(0～5 min,10%A;5～15 min,10%～12%A;15～30 min,12%～26%A;30～43 min,26%～31%A,43～50 min,31%～40%A,50～70 min,40%～55%A;70～84 min,55%～72. 5%A),检测波长230 nm。以共有峰为自变量绘制正交偏最小二乘法-判别分析-变量重要性投影(OPLS-DA-VIP)图,将共有峰对该制剂各批次间指纹图谱差异的贡献度量化,寻找差异较大的色谱峰,结合相关文献,筛选出与参威骨痹片临床适应症相关的成分并进行其含量测定的专属性试验,最终选定质控指标。通过HPLC-二极管阵列检测器(DAD)同时对本品及其生产过程中间体中质控指标进行测定,检测波长236,276,230,322 nm,其他条件同HPLC指纹图谱检测方法。结果:HPLC指纹图谱共标定了26个共有峰,各批次样品指纹图谱与对照指纹图谱的相似度均≥0. 950。优选出马钱苷酸、龙胆苦苷、芍药苷、蛇床子素为参威骨痹片的质控指标,四者的平均质量分数分别为161. 02,401. 80,255. 54,80. 68μg·g-1。结论:所建立的指纹图谱及多指标定量分析方法稳定、可靠,可用于参威骨痹片的质量控制。原料药批间质控指标成分含量差异和生产过程中间体的质控方法不够完善是引起该制剂批间质控指标成分含量差异较大的主要原因。     

早期三阴性乳腺癌治疗模式及新辅助治疗研究进展CSCD

三阴性乳腺癌(TNBC)侵袭性强,易早期复发转移,预后较差,并具有明显的异质性。改善TNBC患者长期预后仍是乳腺癌治疗中所面临的挑战,需要更多的临床证据来指导治疗策略的选择。本文对可手术TNBC患者常规治疗模式及辅助化疗方案的选择、先化疗后手术的治疗模式探索、优化新辅助治疗方案的研究进展等方面进行综述,以期为TNBC治疗的临床实践及研究提供参考。     

子宫颈腺癌Silva分型的临床病理意义及研究现状

子宫颈腺癌与HPV感染高度相关，近期提出的Silva分型相较于目前的诊疗依据，能更好地预测子宫颈腺癌的预后并指导临床治疗。文章就当前子宫颈腺癌的诊治现状、Silva分型的临床病理意义及相关研究进展进行阐述和分析。     

Association between sleep period time and dietary patterns in Brazilian schoolchildren aged 7–13 years

ObjectivesTo assess the association between sleep period time and dietary patterns (DPs) in Brazilian schoolchildren aged 7–13 years.MethodsSleep data of 1019 children were obtained from a questionnaire completed by parents/guardians. Food consumption, physical activity, and screen-based activity were assessed through the validated Web-CAAFE questionnaire. Latent profile analysis was used to identify dietary patterns. Associations between sleep period time and dietary patterns were analyzed by multinomial logistic regression, and the average marginal effect of sleep period time on the probability of adherence to dietary patterns was determined.ResultsOverall, 11.4% of children had inadequate sleep period time (<9 h per day). Three mutually exclusive dietary patterns were identified: “Monotonous” characterized by high consumption of pasta, instant pasta, sweets, and hamburgers/hot dog/pizza/salty snacks; “Traditional” characterized by high consumption of rice, vegetables, green leaves, beans, manioc flour, maize/potatoes, and meats; and “Dairy, bread, green leaves, maize/potatoes and sausage”. The likelihood of adherence to the “Dairy, bread, green leaves, maize/potatoes and sausages” DP decreased by 0.026 as sleep period time increased by 1 h per day. For a sleep period time of more than 10 h per day, the average marginal effect of sleep period time on the likelihood of adherence to the this dietary pattern was significant and negative.ConclusionsSleep period time was inversely associated with adherence to the “Dairy, bread, green leaves, maize/potatoes and sausages” DP; children who slept more than 10 h per day were less likely to present this pattern.     

Ischémie reperfusion en transplantation rénale

Ischemia-reperfusion injury is an inescapable phenomenon in kidney transplantation. It combines lesional processes of biochemical origin associated with oxydative stress and of immunological origin in connection with the recruitment and activation of innate immunity cells. Histological lesions associate acute tubular necrosis and interstitial œdema, which can progress to interstitial fibrosis. The extent of these lesions depends on donor characteristics (age, expanded criteria donor, etc.) and cold ischemia time. In the short term, ischemia-reperfusion results in delayed recovery of graft function. Cold ischemia time also impacts long-term graft survival. Preclinical models, such as murine and porcine models, have furthered understanding of the pathophysiological mechanisms of ischemia-reperfusion injury. Due to its renal anatomical proximity to humans, the porcine model is relevant to assessment of the molecules administered to a donor or recipient, and also of additives to preservation solutions. Different donor resuscitation and graft perfusion strategies can be studied. In humans, prevention of ischemia-reperfusion injury is a research subject as concerns donor conditioning, additive molecules in preservation solutions, graft reperfusion modalities and choice of the molecules administered to the recipient. Pending significant advances in research, the goal is to achieve the shortest possible cold ischemia time.     

Decoding attention control and selection in visual spatial attention

Event‐related potentials (ERPs) are used extensively to investigate the neural mechanisms of attention control and selection. The univariate ERP approach, however, has left important questions inadequately answered. We addressed two questions by applying multivariate pattern classification to multichannel ERPs in two cued visual spatial attention experiments (N = 56): (a) impact of cueing strategies (instructional vs. probabilistic) on attention control and selection and (b) neural and behavioral effects of individual differences. Following cue onset, the decoding accuracy (cue left vs. cue right) began to rise above chance level earlier and remained higher in instructional cueing (~80 ms) than in probabilistic cueing (~160 ms), suggesting that unilateral attention focus leads to earlier and more distinct formation of the attention control set. A similar temporal sequence was also found for target‐related processing (cued target vs. uncued target), suggesting earlier and stronger attention selection under instructional cueing. Across the two experiments: (a) individuals with higher cue‐related decoding accuracy showed higher magnitude of attentional modulation of target‐evoked N1 amplitude, suggesting that better formation of anticipatory attentional state leads to stronger modulation of target processing, and (b) individuals with higher target‐related decoding accuracy showed faster reaction times (or larger cueing effects), suggesting that stronger selection of task‐relevant information leads to better behavioral performance. Taken together, multichannel ERPs combined with machine learning decoding yields new insights into attention control and selection that complement the univariate ERP approach, and along with the univariate ERP approach, provides a more comprehensive methodology to the study of visual spatial attention.