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Objective@#To evaluate analytical performance and clinical application value of a one-step HBV DNA quantitative detecting system.@*Methods@#Analytical performance of the one-step HBV DNA quantitative detecting reagents included precision, residual contamination, accuracy, functional sensitivity and analytical measurement range were verified by collecting high concentration samples and external quality control samples from Jiangsu provincial clinical test center.@*Results@#The within-run coefficient of variation (CV) of both low and high concentration samples were below 5%, meanwhile the intra-assay CV was below 3/5 TEa and inter-assay CV was below 4/5 TEa. There was no residual contamination and the analytic accuracy met the requirement of external quality assessment (EQA). Functional sensitivity was able to attain 100 IU/ml, while the day to day CV was below 20%. It exhibited a benign linear relation from 7.58×101 to 7.58×108 IU/ml.@*Conclusions@#The analytic performance of a new testing system must be evaluated particularly before detecting samples of patients by quantitative tests. This study proves that the one-step HBV DNA quantitative detecting reagents can meet requirement of hepatitis B screening and clinical therapy monitoring, which is economic and simple for clinical routine tests.
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Objective To investigate the expression of LKB1 and p53 in human gastric tissues and their correlation with clinical pathological factors.Methods The expression of LKB1 and p53 in 115 cases of gastric carcinoma and 20 cases of normal gastric tissues were detected by immunohistochemistry method,and the relation between the expression and the clinicopathological parameter of gastric carcinoma was analyzed.Results The positive rates of LKB1 in gastric carcinoma and normal tissues were 20.9 ％ (24/115) and 95.0 ％ (19/20),respectively (P ＜ 0.01).The positive rates of p53 in gastric carcinoma and normal tissues were 45.2 ％ (52/115) and 5.00 ％ (1/20),respectively (P ＜ 0.05).The analysis revealed that the high expression of LBK1 was associated with tumor lymph node metastasis,stage,Lauren classification and worse survival (P ＜ 0.05).The expression of p53 was associated with tumor lymph node metastasis,stage,distant metastasis and worse survival (P ＜ 0.05).Conclusions LKB1 protein expression may play an important role in the development and progression of gastric cancer.LKB1 may be used to assess the malignant biological behavior and prognosis of gastric cancer.
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Objective To evaluate the accuracy of sentinel lymph node biopsy (SLNB) in predicting the axillary lymph node status in breast cancer patients undergoing a breastectomy. Methods From Mar 2002 to Jun 2003,patent blue dye and/or 99m Tc-Sc were used to detect sentinel lymph nodes,samples were sent for fast pathology.Three patients in which the SLN were judged as negative by both the two tests were freed of futher axillary lymph node dissection (ALND). Results SLN were successfully identified in 78 of 81 (96.3%) patients. The accuracy rate of SLNB to predict axillary lymph node status was 97.5%,with 9.7% false negative rate. The success rate,accuracy rate and false negative rate by blue dye only and by a combination of two above methods were 92.5%,94.2%,15.8%,and 100%,100%,0, respectively . Conclusions SLNB accurately predict the axillary status in clinically node negative breast cancer patients .