1.An autophagy-related gene prognostic index predicting biochemical recurrence, metastasis, and drug resistance for prostate cancer.
Wei-Zhen ZHU ; De-Chao FENG ; Qiao XIONG ; Xu SHI ; Fa-Cai ZHANG ; Qiang WEI ; Lu YANG
Asian Journal of Andrology 2023;25(2):208-216
Given the dual role of autophagy presenting in tumorigenesis and inhibition, we established an autophagy-related gene prognostic index (ARGPI) with validation to well predict the biochemical recurrence (BCR), metastasis, as well as chemoresistance for patients with prostate cancer (PCa) who underwent radical radiotherapy or prostatectomy. Then, Lasso and COX regression was used to develop the ARGPI. We performed the whole analyses through R packages (version 3.6.3). Secreted phosphoprotein 1 (SPP1), single-minded 2 (SIM2), serine protease inhibitor b5 (SERPINB5), aldehyde dehydrogenase 2 (ALDH2), and acyl-CoA synthetase long-chain 3 (ACSL3) were eventually used to establish the ARGPI score. Patients were divided into two different-risk groups based on the median ARGPI score, high-risk patients with a higher risk of BCR than low-risk patients (hazard ratio [HR]: 5.46, 95% confidence interval [CI]: 3.23-9.24). The risk of metastasis of high-risk patients was higher than low-risk patients (HR: 11.31, 95% CI: 4.89-26.12). In The Cancer Genome Atlas (TCGA) dataset, we observed similar prognostic value of ARGPI in terms of BCR-free survival (HR: 1.79, 95% CI: 1.07-2.99) and metastasis-free survival (HR: 1.80, 95% CI: 1.16-2.78). ARGPI score showed a diagnostic accuracy of 0.703 for drug resistance. Analysis of gene set enrichment analysis (GSEA) indicated that patients in the high-risk group were significantly positively related to interleukin (IL)-18 signaling pathway. Moreover, ARGPI score was significantly related to cancer-related fibroblasts (CAFs; r = 0.36), macrophages (r = 0.28), stromal score (r = 0.38), immune score (r = 0.35), estimate score (r = 0.39), as well as tumor purity (r = -0.39; all P < 0.05). Drug analysis showed that PI-103 was the common sensitive drug and cell line analysis indicated that PC3 was the common cell line of PI-103 and the definitive gene. In conclusion, we found that ARGPI could predict BCR, metastasis, and chemoresistance in PCa patients who underwent radical radiotherapy or prostatectomy.
Male
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Humans
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Prognosis
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Neoplasm Recurrence, Local/pathology*
;
Prostatic Neoplasms/pathology*
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Prostatectomy
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Drug Resistance
;
Aldehyde Dehydrogenase, Mitochondrial
2.Genotyping of nucleocapsid protein gene of HCV in HIVHCV co-infected patients in Kunming in 2019
ZHU Yan-tao ; LIU Jun-yi ; ZHANG Mi ; ZHANG Nian ; LI Jian-jian ; YANG Bi-hun ; KANG Li-juan ; LI Xiong-jun ; LIU Jia-fa ; WANG Jia-li
China Tropical Medicine 2023;23(1):16-
Abstract: Objective To investigate the distribution characteristics of HCV genotypes and subtypes in patients with HIV (human immunodeficiency virus, HIV)/HCV co-infection in Kunming based on the nucleocapsid protein gene sequence of HCV (hepatitis C virus). Methods Serum was collected from HIV/HCV co-infected patients with household registration in 14 county-level cities, districts and counties under the jurisdiction of Kunming, who admitted to Yunnan Provincial Infectious Disease Hospital from March to August 2019. The viral RNA was extracted from the serum, reverse transcribed to synthesize cDNA, and the HCV nucleocapsid protein gene-specific primers were used for nested PCR amplification. The positive amplification products were sequenced, bioinformatics software such as DNAstar and MEGAX were used for sequence analysis. Results A total of 64 samples from co-infected patients with clinical diagnosis of suspected HIV/HCV were collected and amplified by HCV nucleocapsid protein gene-specific primers, of which 17 samples were amplified positively. The results of sequence analysis showed that the sequences of 9 cases were located in the same evolutionary branch as the HCV 3b subtype sequence, and the nucleotide homology was 93.3%-95.2%; the sequences of 5 cases were located in the same evolutionary branch as the HCV 1b subtype sequence, and the nucleotide homology was 96.8%-97.6%; the sequence of one case and the subtype sequence of HCV 3a gene were located in the same evolutionary branch, and the nucleotide homology was 95.2%; the sequence of one case and HCV 6n gene subtype sequence were located in the same evolutionary branch, and the nucleotide homology was 97.9%; One case was located in the same evolutionary branch as the HCV 6u gene subtype sequence, and the nucleotide homology was 98.4%. Conclusions HCV 1b, HCV 3a, HCV 3b, HCV 6n and HCV 6u genotypes or subtypes of HCV are prevalent in Kunming, and HCV 3b is the most prevalent genotype.
3.Establishment of a predictive nomogram model for predicting the death of very preterm infants during hospitalization.
Zhen-Zhen JUE ; Juan SONG ; Zhu-Ye ZHOU ; Wen-Dong LI ; Yu-Yang YUE ; Fa-Lin XU
Chinese Journal of Contemporary Pediatrics 2022;24(6):654-661
OBJECTIVES:
To establish a nomogram model for predicting the risk of death of very preterm infants during hospitalization.
METHODS:
A retrospective analysis was performed on the medical data of 1 714 very preterm infants who were admitted to the Department of Neonatology, the Third Affiliated Hospital of Zhengzhou University, from January 2015 to December 2019. These infants were randomly divided into a training cohort (1 179 infants) and a validation cohort (535 infants) at a ratio of 7∶3. The logistic regression analysis was used to screen out independent predictive factors and establish a nomogram model, and the feasibility of the nomogram model was assessed by the validation set. The area under the receiver operating characteristic curve (AUC), calibration curve, and decision curve analysis (DCA) were used to assess the discriminatory ability, accuracy, and clinical applicability of the model.
RESULTS:
Among the 1 714 very preterm infants, 260 died and 1 454 survived during hospitalization. By the multivariate logistic regression analysis of the training set, 8 variables including gestational age <28 weeks, birth weight <1 000 g, severe asphyxia, severe intraventricular hemorrhage (IVH), grade III-IV respiratory distress syndrome (RDS), and sepsis, cesarean section, and use of prenatal glucocorticoids were selected and a nomogram model for predicting the risk of death during hospitalization was established. In the training cohort, the nomogram model had an AUC of 0.790 (95%CI: 0.751-0.828) in predicting the death of very preterm infants during hospitalization, while in the validation cohort, it had an AUC of 0.808 (95%CI: 0.754-0.861). The Hosmer-Lemeshow goodness-of-fit test showed a good fit (P>0.05). DCA results showed a high net benefit of clinical intervention in very preterm infants when the threshold probability was 10%-60% for the training cohort and 10%-70% for the validation cohort.
CONCLUSIONS
A nomogram model for predicting the risk of death during hospitalization has been established and validated in very preterm infants, which can help clinicians predict the probability of death during hospitalization in these infants.
Cesarean Section
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Female
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Fetal Growth Retardation
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Hospitalization
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Humans
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Infant
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Infant, Newborn
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Infant, Premature
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Infant, Premature, Diseases
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Nomograms
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Pregnancy
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Retrospective Studies
4.Incidence of extrauterine growth retardation and its risk factors in very preterm infants during hospitalization: a multicenter prospective study.
Wei SHEN ; Zhi ZHENG ; Xin-Zhu LIN ; Fan WU ; Qian-Xin TIAN ; Qi-Liang CUI ; Yuan YUAN ; Ling REN ; Jian MAO ; Bi-Zhen SHI ; Yu-Mei WANG ; Ling LIU ; Jing-Hui ZHANG ; Yan-Mei CHANG ; Xiao-Mei TONG ; Yan ZHU ; Rong ZHANG ; Xiu-Zhen YE ; Jing-Jing ZOU ; Huai-Yu LI ; Bao-Yin ZHAO ; Yin-Ping QIU ; Shu-Hua LIU ; Li MA ; Ying XU ; Rui CHENG ; Wen-Li ZHOU ; Hui WU ; Zhi-Yong LIU ; Dong-Mei CHEN ; Jin-Zhi GAO ; Jing LIU ; Ling CHEN ; Cong LI ; Chun-Yan YANG ; Ping XU ; Ya-Yu ZHANG ; Si-Le HU ; Hua MEI ; Zu-Ming YANG ; Zong-Tai FENG ; San-Nan WANG ; Er-Yan MENG ; Li-Hong SHANG ; Fa-Lin XU ; Shao-Ping OU ; Rong JU
Chinese Journal of Contemporary Pediatrics 2022;24(2):132-140
OBJECTIVES:
To investigate the incidence of extrauterine growth retardation (EUGR) and its risk factors in very preterm infants (VPIs) during hospitalization in China.
METHODS:
A prospective multicenter study was performed on the medical data of 2 514 VPIs who were hospitalized in the department of neonatology in 28 hospitals from 7 areas of China between September 2019 and December 2020. According to the presence or absence of EUGR based on the evaluation of body weight at the corrected gestational age of 36 weeks or at discharge, the VPIs were classified to two groups: EUGR group (n=1 189) and non-EUGR (n=1 325). The clinical features were compared between the two groups, and the incidence of EUGR and risk factors for EUGR were examined.
RESULTS:
The incidence of EUGR was 47.30% (1 189/2 514) evaluated by weight. The multivariate logistic regression analysis showed that higher weight growth velocity after regaining birth weight and higher cumulative calorie intake during the first week of hospitalization were protective factors against EUGR (P<0.05), while small-for-gestational-age birth, prolonged time to the initiation of total enteral feeding, prolonged cumulative fasting time, lower breast milk intake before starting human milk fortifiers, prolonged time to the initiation of full fortified feeding, and moderate-to-severe bronchopulmonary dysplasia were risk factors for EUGR (P<0.05).
CONCLUSIONS
It is crucial to reduce the incidence of EUGR by achieving total enteral feeding as early as possible, strengthening breastfeeding, increasing calorie intake in the first week after birth, improving the velocity of weight gain, and preventing moderate-severe bronchopulmonary dysplasia in VPIs.
Female
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Fetal Growth Retardation
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Gestational Age
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Hospitalization
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Humans
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Incidence
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Infant
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Infant, Newborn
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Infant, Premature
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Infant, Very Low Birth Weight
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Prospective Studies
;
Risk Factors
5.Optimization and evaluation of Xiaoer Pudilan Xiaoyan Syrup based on characterization of material properties.
Xuan LI ; Ke DING ; Dang YANG ; Meng-Hua JIANG ; Chao LI ; Fa-Gen ZHU ; Jian-Guo SHAO ; E SUN ; Liang FENG ; Xiao-Bin JIA
China Journal of Chinese Materia Medica 2022;47(21):5746-5756
According to the taste analysis of Pudilan Xiaoyan Oral Liquid, the unpleasant taste of the oral liquid is mainly caused by the inherent taste of Chinese medicine and the taste introduced in the preparation process, which leads to its unpopularity among children. Therefore, aiming at the special children patient group, Xiaoer Pudilan Xiaoyan Syrup was developed via technology optimization and dosage form improvement to improve the unpleasant taste and enhance the medication compliance among children. Based on the material properties of Pudilan Xiaoyan Oral Liquid and Xiaoer Pudilan Xiaoyan Syrup extracts, the authors compared the properties(pH, density, turbidity, viscosity, chromaticity, particle size), taste, content of five quality markers and in vivo pharmacokinetic characteristics of these two preparations, to evaluate the suitability of Xiaoer Pudilan Xiaoyan Syrup. The results showed that compared with those of Pudilan Xiaoyan Oral Liquid, the pH, density, turbidity, viscosity and chromaticity of Xiaoer Pudilan Xiaoyan Syrup were significantly changed, and the unpleasant taste was reduced by 26%; the transfer rate of the main active ingredients chicoric acid was increased, while the transfer rate of baicalin had small difference from that of the oral liquid. In addition, pharmacokinetics revealed that the total absorption amount of baicalin in vivo was higher, and the time to peak T_(max) of baicalin and oroxindin in the syrup and the mean residence time MRT_(last )of corynoline in vivo were significantly prolonged. The absorption degree of Xiaoer Pudilan Xiaoyan Syrup and Pudilan Xiaoyan Oral Liquid in the body was the same: baicalin>oroxindin>corynoline. The new dosage form process was simpler than that of the original dosage form, safe, environmentally friendly, reasonable and feasible, meeting the mass production demand. This provided a basis for the reasonable and scientific optimization of Xiaoer Pudilan Xiaoyan Syrup, and also laid a foundation for its further safe and rational use, so as to expand the clinical application in children.
Child
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Humans
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Drugs, Chinese Herbal
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Glucuronates
6.A multi-center retrospective study of perioperative chemotherapy for gastric cancer based on real-world data.
Xue Wei DING ; Zhi Chao ZHENG ; Qun ZHAO ; Gang ZHAI ; Han LIANG ; Xin WU ; Zheng Gang ZHU ; Hai Jiang WANG ; Qing Si HE ; Xian Li HE ; Yi An DU ; Lu Chuan CHEN ; Ya Wei HUA ; Chang Ming HUANG ; Ying Wei XUE ; Ye ZHOU ; Yan Bing ZHOU ; Dan WU ; Xue Dong FANG ; You Guo DAI ; Hong Wei ZHANG ; Jia Qing CAO ; Le Ping LI ; Jie CHAI ; Kai Xiong TAO ; Guo Li LI ; Zhi Gang JIE ; Jie GE ; Zhong Fa XU ; Wen Bin ZHANG ; Qi Yun LI ; Ping ZHAO ; Zhi Qiang MA ; Zhi Long YAN ; Guo Liang ZHENG ; Yang YAN ; Xiao Long TANG ; Xiang ZHOU
Chinese Journal of Gastrointestinal Surgery 2021;24(5):403-412
Objective: To explore the effect of perioperative chemotherapy on the prognosis of gastric cancer patients under real-world condition. Methods: A retrospective cohort study was carried out. Real world data of gastric cancer patients receiving perioperative chemotherapy and surgery + adjuvant chemotherapy in 33 domestic hospitals from January 1, 2014 to January 31, 2016 were collected. Inclusion criteria: (1) gastric adenocarcinoma was confirmed by histopathology, and clinical stage was cT2-4aN0-3M0 (AJCC 8th edition); (2) D2 radical gastric cancer surgery was performed; (3) at least one cycle of neoadjuvant chemotherapy (NAC) was completed; (4) at least 4 cycles of adjuvant chemotherapy (AC) [SOX (S-1+oxaliplatin) or CapeOX (capecitabine + oxaliplatin)] were completed. Exclusion criteria: (1) complicated with other malignant tumors; (2) radiotherapy received; (3) patients with incomplete data. The enrolled patients who received neoadjuvant chemotherapy and adjuvant chemotherapy were included in the perioperative chemotherapy group, and those who received only postoperative adjuvant chemotherapy were included in the surgery + adjuvant chemotherapy group. Propensity score matching (PSM) method was used to control selection bias. The primary outcome were overall survival (OS) and progression-free survival (PFS) after PSM. OS was defined as the time from the first neoadjuvant chemotherapy (operation + adjuvant chemotherapy group: from the date of operation) to the last effective follow-up or death. PFS was defined as the time from the first neoadjuvant chemotherapy (operation + adjuvant chemotherapy group: from the date of operation) to the first imaging diagnosis of tumor progression or death. The Kaplan-Meier method was used to estimate the survival rate, and the Cox proportional hazards model was used to evaluate the independent effect of perioperative chemo therapy on OS and PFS. Results: 2 045 cases were included, including 1 293 cases in the surgery+adjuvant chemotherapy group and 752 cases in the perioperative chemotherapy group. After PSM, 492 pairs were included in the analysis. There were no statistically significant differences in gender, age, body mass index, tumor stage before treatment, and tumor location between the two groups (all P>0.05). Compared with the surgery + adjuvant chemotherapy group, patients in the perioperative chemotherapy group had higher proportion of total gastrectomy (χ(2)=40.526, P<0.001), smaller maximum tumor diameter (t=3.969, P<0.001), less number of metastatic lymph nodes (t=1.343, P<0.001), lower ratio of vessel invasion (χ(2)=11.897, P=0.001) and nerve invasion (χ(2)=12.338, P<0.001). In the perioperative chemotherapy group and surgery + adjuvant chemotherapy group, 24 cases (4.9%) and 17 cases (3.4%) developed postoperative complications, respectively, and no significant difference was found between two groups (χ(2)=0.815, P=0.367). The median OS of the perioperative chemotherapy group was longer than that of the surgery + adjuvant chemotherapy group (65 months vs. 45 months, HR: 0.74, 95% CI: 0.62-0.89, P=0.001); the median PFS of the perioperative chemotherapy group was also longer than that of the surgery+adjuvant chemotherapy group (56 months vs. 36 months, HR=0.72, 95% CI:0.61-0.85, P<0.001). The forest plot results of subgroup analysis showed that both men and women could benefit from perioperative chemotherapy (all P<0.05); patients over 45 years of age (P<0.05) and with normal body mass (P<0.01) could benefit significantly; patients with cTNM stage II and III presented a trend of benefit or could benefit significantly (P<0.05); patients with signet ring cell carcinoma benefited little (P>0.05); tumors in the gastric body and gastric antrum benefited more significantly (P<0.05). Conclusion: Perioperative chemotherapy can improve the prognosis of gastric cancer patients.
Chemotherapy, Adjuvant
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Female
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Gastrectomy
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Humans
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Male
;
Neoadjuvant Therapy
;
Neoplasm Staging
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Prognosis
;
Retrospective Studies
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Stomach Neoplasms/surgery*
7.Insulin Resistance in Polycystic Ovary Syndrome Improved by Chinese Medicine Dingkun Pill (): A Randomized Controlled Clinical Trial.
Yan DENG ; Wei XUE ; Yan-Fang WANG ; Xiao-Hui LIU ; Shi-Yang ZHU ; Xiao MA ; Hong-Ling ZUO ; Jian-Fa JIANG ; Ting-Ping ZHENG ; Ai-Jun SUN
Chinese journal of integrative medicine 2019;25(4):246-251
OBJECTIVE:
To assess the efficacy and safety of the Chinese medicine Dingkun Pill (, DKP) on insulin resistance in women with polycystic ovary syndrome (PCOS).
METHODS:
A total of 117 women with PCOS were randomly assigned to Group A (38 women), Group B (40 women), or Group C (39 women) in a randomization sequence with SAS software and a 1:1:1 allocation ratio using random block sizes of 6, and were given 7 g of oral DKP daily (Group A), 1 tablet of Diane-35 orally daily (Group B), or 7 g of oral DKP daily plus 1 tablet of Diane-35 orally daily (Group C). Patients took all drugs cyclically for 21 consecutive days, followed by 7 drug-free days. The treatment course for the 3 groups was continued for 3 consecutive months. Oral glucose tolerance tests (OGTT) were performed before treatment and again after 2 and 3 months of therapy, respectively, and homeostasis model assessment for insulin resistance (HOMA-IR) and quantitative insulin sensitivity check index (QUICKI) were calculated.
RESULTS:
Of 117 women with PCOS, 110 completed the entire course of therapy: 35 in Group A, 36 in Group B, and 39 in Group C. After treatment, all three groups showed significant decreases in fasting glucose: at 1 h glucose decreased significantly in Group A (by 0.5 ± 1.4 mmol/L, P=0.028) and Group C (by 0.5 ± 1.2 mmol/L, P=0.045); while showing a tendency to increase in Group B (by 0.4 ± 1.9 mmol/L, P=0.238). HOMA-IR decreased significantly in Group C [by 0.5 (-2.2 to 0.5) mIU mmol/L, P=0.034]. QUICKI was significantly increased in Groups A and C (by 0.009 ± 0.02, P=0.033 and by 0.009 ± 0.027, P=0.049, respectively), while no change was observed in Group B. Repeated-measure ANOVA showed that the absolute changes in all parameters (except for glucose at 1 h), including glucose and insulin levels at all time-points during OGTT and in HbA1c, HOMA-IR, and QUICKI, were not significantly different among the 3 groups after treatment (P>0.05).
CONCLUSION
DKP or DKP combined with Diane-35 produce a slight improvement in insulin sensitivity compared with Diane-35 alone in PCOS patients (Trial Registration: ClinicalTrials.gov, NCT03264638).
8.External Quality Analysis of Quality Indicators on Specimen Acceptability
Yuan-Yuan YE ; Wei WANG ; Hai-Jian ZHAO ; Feng-Feng KANG ; Wei-Xing LI ; Zhi-Ming LU ; Wei-Min ZOU ; Yu-Qi JIN ; Wen-Fang HUANG ; Bin XU ; Fa-Lin CHEN ; Qing-Tao WANG ; Hua NIU ; Bin-Guo MA ; Jian-Hong ZHAO ; Xiang-Yang ZHOU ; Zuo-Jun SHEN ; Wei-Ping ZHU ; Yue-Feng L(U) ; Liang-Jun LIU ; Lin ZHANG ; Li-Qiang WEI ; Xiao-Mei GUI ; Yan-Qiu HAN ; Jian XU ; Lian-Hua WEI ; Pu LIAO ; Xiang-Ren A ; Hua-Liang WANG ; Zhao-Xia ZHANG ; Hao-Yu WU ; Sheng-Miao FU ; Wen-Hua PU ; Lin PENG ; Zhi-Guo WANG
Journal of Modern Laboratory Medicine 2018;33(2):134-138,142
Objective To analyze the status of quality indicators(QI) on specimen acceptability and establish preliminary qual ity specification.Methods Web based External Quality Assessment system was used to collect data of laboratories partici pated in "Medical quality control indicators in clinical laboratory" from 2015 to 2017,including once in 2015 and 2017 and twice in 2016.Rate and sigma scales were used to evaluate incorrect sample type,incorrect sample container,incorrect fill level and anticoagulant sample clotted.The 25th percentile (P25) and 75th percentile (P75) of the distribution of each QI were employed to establish the high,medium and low specification.Results 5 346,7 593,5 950 and 6 874 laboratories sub mitted the survey results respectively.The P50 of biochemistry (except incorrect fill level),immunology and microbiology reach to 6σ.The P50 of clinical laboratory is 4 to 6σ except for incorrect sample container.There is no significant change of the continuous survey results.Based on results in 2017 to establish the quality specification,the P25 and P75 of the four QIs is 0 and 0.084 4 %,0 and 0.047 6 %,0 and 0.114 2 %,0 and 0.078 4 %,respectively.Conclusion According to the results of the survey,most laboratories had a faire performance in biochemistry,immunology and microbiology,and clinical laboratory needs to be strengthened.Laboratories should strengthen the laboratory information system construction to ensure the actual and reliable data collection,and make a long time monitoring to achieve a better quality.
9.Optimization strategies for thoracic wall reconstruction and repairing the huge soft-tissue defects after locally advanced breast cancer resection based on 11 years clinical experiences in a single Chinese center
Ming ZHU ; Xiao-Fei MA ; Yan-Wen YANG ; Yong ZHANG ; Zi-Hao FENG ; Fa-Zhi QI ; Jian-Ying GU
Chinese Journal of Clinical Medicine 2018;25(2):182-187
Objective:To review and summarize our experience of surgical approach and reconstructive strategy for locally advanced breast cancer(LABC).Methods:A retrospective study was conducted using the medical records of 252 patients who underwent LABC treatment in our department from March 2006 to August 2017.Totally 197 of them were primary tumor and 55 were secondary.All the patients were received neoadjuvant chemotherapy.Surgical technology and clinical outcomes were compared and statistical analyzed.Results:The average hospital stay time of these patients was(12.9 ± 3.4)d(9-45 d),and the follow-up period after surgery was(18.7 ± 9.6)months(5-72 months).The size of tumor ranged 30 cm×25 cm to 5 cm×13 cm.71 of these cases had the whole chest wall defect,which 41 of them reconstructed with titanium mesh to establish the stability of chest.The sizes of flaps for reconstructing soft tissue defects ranged 14 cm×6 cm-29 cm×30 cm.Different flaps were selected for covering the chest wall defect,which local flaps for 16 case(6.3%);pectoralis major myocutaneous combined with breast flaps for 31 cases(12.3%);lateral thoracic flaps for 34 cases(13.5%);latissimus dorsi myocutaneous flaps with pedicle for 98 cases(38.9%);rectus abdominis musculocutaneous flaps for 56 cases(22.2%)and deep inferior epigastric perforator flaps(DIEP flaps)for 17 cases(6.7%).All the patients recovered well,and the function and appearance of chest wall were satisfactory(P< 0.05).Conclusions:Plastic technology for reconstruction provides a useful strategy and method for LABC treatment,and is able to improve the life quality and prognosis of the patients.
10.Thickness of osteotomy affecting biomechanics of tibia cross-section in total knee arthroplasty
Qing CHEN ; Hua-Jun SHENG ; Xing-Rui LI ; Ling GUO ; Qing-Hua YANG ; Shu-Juan ZHU ; Fa-Jin LV
Journal of Medical Biomechanics 2017;32(2):148-153
Objective To obtain different biomechanical conditions of the tibia section with different osteotomy thickness under different activity states,so as to provide theoretical basis for total knee arthroplasty (TKA) and patient activities after operation.Methods The three-dimensional models of lower limb were reconstructed and the proximal tibia was resect by 0 mm,5 mm,7 mm,9 mm,respectively,based on the principle of bone resection in TKA.The tibia models after osteotomy were assigned with the material properties,and the stress and strain of the tibia cross-section were then analyzed under the following activity states:standing,walking,running and climbing upstairs.Results The stress and displacement of the tibia cross-section increased with the increase of osteotomy thickness under the same activity state.The maximum stress and displacement of tibia cross-section with the same osteotomy thickness showed an increasing trend when the strength of activity increased.Conclusions For TKA in clinic,the stress and strain on tibia cross-section become larger with the thicker tibia osteotomy and the stronger postoperative activity.Excessive osteotomy in TKA and activity too intensively after TKA should be avoided,so as to reduce stress and strain of the tibia plateau and promote long-term life of the prosthesis.

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