Using gas chromatography and mass spectrometry to determine 25-hydroxyvitamin D levels for clinical assessment of vitamin D deficiency

Vitamin D is responsible for multiple metabolic functions in humans. Rickets are the most common disease caused by vitamin D deficiency. It is caused by poor calcium intake resulting in poor serum-ionized calcium. The purpose of this study is to develop a rapid, sensitive, and feasible method to determine the 25-hydroxy-vitamin D3 (25(OH)D3) levels in blood samples for clinical assessment. In this study, gas chromatography coupled mass spectrometry with trimethylsilyl derivatization (TMS-GC-MS) is the most suitable protocol for quantitative analyses of 25(OH)D3. Performance of method was evaluated and compared with liquid chromatography and immunoassay. Method validation has been carried out with plasma specimens. The limit of quantitation of TMS-GC-MS method is 1.5 ppb with good linear correlation. Furthermore, the dietary intake and nutritional status of vegetarian and non-vegetarians in Taiwan were assessed by our validated method. As a result, this vitamin D nutrition survey demonstrates that most Taiwanese people have insufficient vitamin D. Due to dietary habits; the male vegans may have the highest risk of vitamin D deficiency.     

The prognostic role of tumour‐infiltrating lymphocytes in oral squamous cell carcinoma: A meta‐analysis

It has been suggested that tumour‐infiltrating lymphocytes (TILs) are associated with the progression of oral squamous cell carcinoma (OSCC). However, the prognostic value of TILs is inconclusive due to the heterogeneity of immune cells within the tumour microenvironment. In this meta‐analysis, we aimed to assess the prognostic value of TILs in OSCC. The PubMed, Cochrane, Embase, Scopus and Web of Science databases were searched up to April 20, 2019, and 33 studies were ultimately included in this meta‐analysis. Our pooled meta‐analysis showed that high infiltration of CD8⁺ TILs, CD45RO⁺ TILs and CD57⁺ TILs favoured better overall survival (OS). However, high infiltration of CD68⁺ macrophages and CD163⁺ macrophages was associated with poor prognosis in OSCC. These findings suggest that CD8⁺ TILs, CD45RO⁺ TILs, CD57⁺ TILs, CD68⁺ macrophages and CD163⁺ macrophages might serve as novel prognostic factors and therapeutic targets in OSCC.     

Analysis of early mortality and related risk factors in maintenance hemodialysis patients

Objective To analyze the early mortality and related risk factors of new hemodialysis patients in Zhejiang province, and provide basis for reducing the death risk of hemodialysis patients. Methods The early mortality and related factors of new hemodialysis patients from January 1, 2010 to June 30, 2018 were retrospectively analyzed using the database of Zhejiang province hemodialysis registration. The early mortality was defined as death within 90 days of dialysis. Cox regression model was used to analyze the related risk factors of the early mortality in hemodialysis patients. Results The mortality was the highest in the first month after dialysis (46.40/100 person year), and gradually stabilized after three months. The early mortality was 25.33/100 person year. The mortality within 120 days and 360 days were 21.40/100 person year and 11.37/100 person year, respectively. The elderly (≥65 years old, HR=1.981, 95%CI 1.319-2.977, P＜0.001), primary tumor (HR=3.308, 95%CI 1.137-5.624, P=0.028), combined with tumors (not including the primary tumor, HR=2.327, 95%CI 1.200-4.513, P=0.012), temporary catheter (the initial dialysis pathway, HR=3.632, 95%CI 1.806-7.307, P＜0.001), lower albumin (＜30 g/L, HR=2.181, 95%CI 1.459-3.260, P＜0.001), lower hemoglobin (every 0.01 g/L increase, HR=0.861, 95%CI 0.793-0.935, P=0.001), lower high density lipoprotein (＜0.7 mmol/L, HR=1.796, 95%CI 1.068-3.019, P=0.027) and higher C reactive protein (≥40 mg/L, HR=1.889, 95%CI 1.185-3.012, P=0.008) were the risk factors of early death for hemodialysis patients. Conclusions The early mortality of hemodialysis patients is high after dialysis, and gradually stable after 3 months. The elderly, primary tumor, combined with tumors, the initial dialysis pathway, lower albumin, lower hemoglobin, lower high density lipoprotein and higher C reactive protein are the risk factors of early death for hemodialysis patients.     

早期乳腺癌后续强化辅助内分泌治疗(MA-17研究结果解读)

1乳腺癌内分泌治疗:他莫昔芬的益处和局限性他莫昔芬(TAM)是最常用的乳腺癌内分泌治疗的药物,关于TAM在早期乳癌术后预防复发转移的辅助治疗阶段中应用,最为权威的结论来自发表在Lancet上、对5 5个临床试验共计37 000例患者的综合回顾报告,目前TAM在乳癌辅助治疗中应用的基本共识有:①辅助内分泌治疗的决定因素为激素受体(ER/PR)状况,ER阳性者效果最好,部分ER、阴性PR阳性的患者也可以使用TAM,但ER阴性患者辅助治疗用TAM不能改善生存;②目前认为TAM合适的服药时间为5年,可以显著降低复发风险12%,提高生存率9%。至于再延长用药…     

Additional bedtime H2‐receptor antagonist for the control of nocturnal gastric acid breakthrough: A Cochrane systematic review

OBJECTIVES: To assess the effectiveness and safety of additional bedtime H₂‐receptor antagonists (H₂RAs) in suppressing nocturnal gastric acid breakthrough (NAB) via a systematic review. METHODS: Eligible trials were identified by searching the Cochrane Central Register of Controlled Trials (CENTRAL) (Cochrane Library Issue 2, 2004), MEDLINE (January 1966–June 2004), EMBASE (January 1980–June 2004) and CINAHL (January 1982–June 2004). Additional hand‐searching was conducted on the proceedings of correlated conferences, eight important Chinese journals and references of all included trials. All randomized controlled trials evaluating H₂RAs for the control of NAB were eligible for inclusion. The systematic review was conducted using methods recommended by The Cochrane Collaboration. RESULTS: Only two randomized crossover studies, comprising 32 participants, met the inclusion criteria. Because the design, dosage and duration of the treatments were different between the studies, it was not possible to conduct meta‐analysis. There were no consistent conclusions found between the two included studies in evaluating H₂RAs for the control of NAB. CONCLUSIONS: No implications for practice at this stage can be concluded. Appropriately designed large‐scale randomized controlled trials with long‐term follow up are needed to determine the effects of additional bedtime H₂RAs in suppressing NAB.     

大鼠脑血肿周围组织半胱氨酸天冬氨酸蛋白酶3表达变化与尼莫地平的影响

目的：观察脑出血后血肿周围半胱氨酸天冬氨酸蛋白酶3的表达。及尼莫地平对其的影响。方法：实验于2004—07在大连医科大学中心实验室进行。取120只SD雄性大鼠随机分为3组：①尼莫地平组（n=50）：尾壳核注射自体股动脉血50μL复制脑出血模型，造模即刻腹腔注射尼莫地平1．6mg／kg（即8μL／g），以后每天1次。②模型组（n=50）：同前造模，术后腹腔注射等量生理盐水。③假手术组（n=20）：手术，但进针人尾壳核后不注血。各组分为术后6，24，48，72h、5d 5个时间点。造模动物醒后进行Bederson评分，评估其行为和神经功能缺陷（0—3分。评分越高，神经功能缺陷越重，评分≥2分为造模成功）。人组动物在以上5个时间点进行Bederson评分后，麻醉状态下处死取脑，经尾壳核行冠状切片，行免疫组化测定半胱氨酸天冬氨酸蛋白酶3表达。结果：80只大鼠进入结果分析。①Bederson评分：模型组、尼莫地平组大鼠醒后迅速出现偏瘫，24h后评分趋于稳定，至72h之间评分最高，然后逐渐下降，5d时仍有体征。模型组、尼莫地平组各时间点评分均高于对照组（P〈0．01），尼莫地平组术后48，72h评分低于模型组（P〈0.05）。②血肿周围组织半胱氨酸天冬氨酸蛋白酶3表达：假手术组进针侧脑组织表达很少，模型组6h后即有表达，24h达高峰，持续72h后逐渐下降，5d后仅有少量表达；尼莫地平组动态变化趋势与模型组相同，但各时间点的数值均较低，尤其是术后24～72h（P〈0．01）。结论：①脑出血后血肿周围组织中半胱氨酸天冬氨酸蛋白酶3表达升高，提示其与脑出血血肿周围组织损伤有一定关系。②尼莫地平降低脑出血后血肿周围组织中半胱氨酸天冬氨酸蛋白酶3表达，从而减轻细胞凋亡程度，对神经细胞起到保护作用，降低神经功能缺陷。     

血清S100ββ变化与老年患者腹部手术后认知功能障碍的关系

目的观察老年患者腹部手术后S100ββ蛋白的变化以及术后认知功能障碍(POCD)的发生情况,并探讨二者的关系。方法26例65岁以上的老年患者ASAⅡ~Ⅲ级,行腹部手术。监测术前、术毕、术后6、24、48、72h血清S100ββ的变化,并评定术前及术后1周内的认知功能。结果老年患者血清S100ββ蛋白在术毕最高(P<0·01),术后6h和24h逐渐下降,但术后48h再次上升(P<0·01),术后72h回复至术前水平。26例老年患者腹部手术后1周内有7例发生POCD。POCD组与非POCD组相比,术毕及术后6h血清S100ββ蛋白水平明显增高(P<0·05)。结论老年患者腹部手术后POCD的发生与血清S100ββ蛋白的变化有密切关系。血清S100ββ蛋白可作为评估老年患者术后发生POCD的重要指标。