RESUMO
Background: Polyamines present in human body are frequently considered as markers of occurrence of cancer. Therefore, the availability of simple and efficient method for determination of their level in body liquids and tissues is of some interest. Methods: Supported liquid membrane technology coupled with HPLC seems to be an appropriate technique to follow the level of polyamines in human blood and urine. Thus, the membranes of two different geometries: flat sheet and hollow fiber were studied as a mean for separation and enrichment of studied polyamines from urine and tissue samples in order to prepare samples to be analyzed by HPLC. Conclusions: Developed extraction systems offer an interesting alternative to traditional techniques such as: liquid-liquid or solid-phase extraction due to several features, which are: very high enrichment of polyamines without previous work-up, simple procedure of extraction and tiny volume of organic solvents used. This enables efficient determination of their levels in body liquids (AU)
Assuntos
Humanos , Poliaminas/síntese química , Cadaverina , Putrescina , Espermidina , Espermina , Biomarcadores Tumorais/classificação , Neoplasias/diagnósticoRESUMO
Objective To appraise the analytical capability of flow cytometric bead array for lung cancer markers through the tests of limit of detection,relative standard deviation,specificity,methods comparation and linearity rang.Methods The limit of detection,relative standard deviation,specificity and linearity rang in detection of Carcinoembryonic antigen (CEA),cytokeratin 19 (Cyfra21-1) and neuron specific enolase (NSE) in serum were evaluated by flow cytometer.Western blotting method was ultilized to validate the specificity of antibody-antigen recognization.The interference of hemoglobin,three acyl glycerol and bilirubin on the detection of CEA,Cyfra21-1 and NSE was tested.Compared to electrochemiluminescence immunoassay,the relative error for flow cytometric bead array was assessed.Results Flow cytometric bead array demonstrated that the limit of detection was 1.71 pg/mL for CEA,3.97 pg/mL for cyfra21-1,and 2.27 pg/mL for NSE.The relative standard deviation for intra-assay and inter-assay were below 10％ and 15％,respectively.The pair of antibodies can defferentially recognize antigens.The measurement for CEACAM6,CK18,NSE appeared that there was no significant cross-talking reaction.Three acyl glycerol and bilirubin did not significantly interfere with the detection for serum samples.Hemoglobin of 500 ng/mL can significantly interfere with the detection of Cyfra21-1 (P ＜ 0.05) and NSE (P ＜ 0.05).The correlation coefficient between flow cytometric array and electrochemiluminescence immunoassay was 0.984 2 for serum CEA,0.962 2 for serum cyfra 21-1 and 0.982 0 for serum NSE.The linearity ranged from 355.76 pg/mL to 367.74 ng/mL for CEA,from 87.89 pg/mL to 107.8 ng/mL for cyfra21-1,and from 90.12 pg/mL to 86.07 ng/mL for NSE.Conclusion Flow cytometric array for lung cancer markers may be of use in clinical detection.
RESUMO
Ovarian cancer is the most fatal gynaecologic malignance. At present, there is no sensitive test to detect early stages of the disease. In our study of 32 ovarian cancer patients admitted in Siriraj Hospital, 3 new tumor makers, STN, CA 546 and CA 72-4 were selected to evaluate for their sensitivity as compared with CA 125 Kit. The best positive rate for non-mucinous type of ovarian cancer was 82% obtained from the CA 125 test while the result for mucinous type was 67% obtained from a combined test of CA 125 and STN. As a requirement for early diagnosis, tests using CA 125 or CA 72-4 showed best sensitivity of 33% in early stages of non-mucinous, while CA 546 test revealed the highest result of 33% for mucinous type. Thus, the combination of new tumor marker assay of STN, CA 546, CA 72-4 together with CA 125 would increase sensitivity in detecting ovarian cancer especially for the mucinous type which is more common in Thailand.