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  • 1
    In: Analytical Biochemistry, Elsevier BV, Vol. 624 ( 2021-07), p. 114169-
    Type of Medium: Online Resource
    ISSN: 0003-2697
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
    detail.hit.zdb_id: 1461105-3
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  • 2
    In: Cancer Medicine, Wiley, Vol. 8, No. 12 ( 2019-09), p. 5619-5628
    Abstract: Methylated SEPT9 showed relatively low sensitivity in detecting early stage colorectal cancer (CRC) and advanced adenomas (AA) in plasma. Combination of multiple biomarkers was an effective strategy to improve sensitivity in early stage cancer diagnosis and screening. A new qPCR‐based assay combining the detection of methylated SEPT9 and SDC2 (ColoDefense test) was used. Methylation statuses of SEPT9 and SDC2 were examined in 40 sets of cancer tissues and paired adjacent tissues, 10 adenomatous polyps and 3 hyperplastic polyps (HP). Then evaluated with 384 plasma samples, including 117 CRC patients, 23 AA patients, 78 small polyps patients, and 166 normal individuals. The limit of detection of ColoDefense was about 25 pg per reaction. Both SEPT9 and SDC2 were shown by ColoDefense to be heavily methylated in CRC tissues when compared to paired paracancerous tissues and HP ( P   〈  .01). The sensitivities for detecting AA and stage I CRC by plasma SEPT9 methylation alone were 12.1% and 65.0%, and those by plasma SDC2 methylation alone were 43.5% and 55.0%. In comparison, the sensitivities to detect AA and stage I CRC by ColoDefense improved to 47.8% and 80.0%. The overall sensitivity of ColoDefense in detecting CRC was 88.9% (95% CI: 81.4%‐93.7%) with a specificity of 92.8% (95% CI: 87.4%‐96.0%). Detection of the combinatorial biomarker of methylated SEPT9 and/or SDC2 is a powerful, convenient and highly effective strategy for early CRC screening with high sensitivity and specificity.
    Type of Medium: Online Resource
    ISSN: 2045-7634 , 2045-7634
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 2659751-2
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  • 3
    In: International Journal of Genomics, Hindawi Limited, Vol. 2021 ( 2021-4-21), p. 1-11
    Abstract: Background. Colorectal cancer (CRC) is one of the leading causes of cancer deaths worldwide and in China. Early CRC screening is the best approach to reduce its incidence and mortality rates. The ColoDefense test, a multiplex qPCR assay simultaneously detecting both methylated SEPT9 and SDC2 genes, has demonstrated improved clinical performance on either methylation biomarker alone for CRC screening with both blood and stool samples. Method. Leftover blood chemistry test samples from 125 CRC, 35 advanced adenoma, and 35 small polyp patients and 92 healthy control subjects were examined by the ColoDefense test. Among these samples, the levels of three circulating tumor markers, CEA, AFP, and CA19-9, were also measured for 106 CRC, 28 advanced adenoma, and 20 small polyp patients and all control subjects. Results. Due to the smaller volume and extended storage in nonfrozen state, the ColoDefense test with these samples exhibited reduced performance for all stages of CRC and advanced adenomas. The performance of CEA, AFP, and CA19-9 and their various combinations was also evaluated for CRC screening to identify the tumor marker combinations with the best performance. When combined with the ColoDefense test, the identified combinations did improve the clinical performance. Conclusion. These results suggested a rational path towards developing a CRC screening method that takes advantage of leftover blood chemistry test samples. The successful development of such a method will undoubtedly help promote early CRC screening by increasing its accessibility for the general public.
    Type of Medium: Online Resource
    ISSN: 2314-4378 , 2314-436X
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2711883-6
    SSG: 12
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  • 4
    In: Diagnostic Cytopathology, Wiley, Vol. 47, No. 5 ( 2019-05), p. 439-444
    Abstract: Persistent high‐risk human papillomavirus (HR‐HPV) infection is the etiological cause of virtually all cervical cancer cases. HR‐HPV screening achieved with earlier generations of HR‐HPV tests has been instrumental in the prevention and early detection of cervical cancer worldwide. The first FDA‐approved HR‐HPV test, digene Hybrid Capture 2 HPV DNA Test (HC2), has been prominent in these efforts. Newer tests have since been developed to improve upon the capability of HC2 test. Methods To evaluate the performance of a new multiplex real‐time quantitative PCR assay for HR‐HPV detection, CerviHPV HR‐HPV Test (CerviHPV), 232 cervical swab specimens were collected and analyzed by HC2 and CerviHPV tests for comparison. Results HC2 test detected 69 (29.7%) positive cases, whereas CerviHPV test reported 43 (18.5%) positive cases. The concordance rate between the two tests was 84.5% with a kappa value of 0.579. Additional analyses identified only HPV66 or low‐risk HPV (LR‐HPV) types in six HC2 positive discordant cases, suggesting these HC2 results to be false positive. Conclusion CerviHPV test has two advantages over HC2 test: It contains a cellular control to eliminate false negative results due to failed sample collection and processing, and it can simultaneously detect and genotype the two most carcinogenic HPV types, HPV16 and 18. In this comparison study, CerviHPV test also demonstrated higher analytical specificity for HR‐HPV genotypes than HC2 test. Therefore, CerviHPV test has the potential to become a viable option for cervical cancer screening in the clinics.
    Type of Medium: Online Resource
    ISSN: 8755-1039 , 1097-0339
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 2001251-2
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  • 5
    Online Resource
    Online Resource
    Springer Science and Business Media LLC ; 2022
    In:  Journal of Mechanical Science and Technology Vol. 36, No. 7 ( 2022-07), p. 3227-3237
    In: Journal of Mechanical Science and Technology, Springer Science and Business Media LLC, Vol. 36, No. 7 ( 2022-07), p. 3227-3237
    Type of Medium: Online Resource
    ISSN: 1738-494X , 1976-3824
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 2467571-4
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  • 6
    Online Resource
    Online Resource
    SAGE Publications ; 2020
    In:  Cancer Control Vol. 27, No. 2 ( 2020-04-01), p. 107327482092255-
    In: Cancer Control, SAGE Publications, Vol. 27, No. 2 ( 2020-04-01), p. 107327482092255-
    Abstract: Gastric cancer (GC) is fifth most frequently diagnosed cancer and second leading cause of cancer in China. More than 80% of GC are diagnosed at an advanced stage due to low uptake rate of invasive screening method. The performance of methylated SFRP2 test was evaluated in 236 plasma samples, including 92 patients with GC, 16 intestinal metaplasia patients, 26 gastric fundic gland polyp patients, 13 small adenoma patients, 39 hyperplastic polyp patients, and 50 control patients. The sensitivity of plasma methylated SFRP2 was compared to serum CEA, CA72-4, CA19-9, and CA242 results in 79 patients with GC. The sensitivities for detecting GC and gastric intestinal metaplasia by methylated SFRP2 test were 60.9% and 56.3% with a specificity of 86.0%. Methylated SFRP2 test had significantly higher positive detection rate for patients with GC than gastric fundic gland polyp, small adenoma, and hyperplastic polyp patients. In 79 patients with GC, the sensitivities of CEA, CA72-4, CA19-9, and CA242 for detecting GC were 22.8%, 16.5%, 12.7%, and 11.4%. In comparison, the sensitivity of methylated SFRP2 test for detecting GC was 58.2%. Plasma methylated SFRP2 test may become a valuable tool for the noninvasive detection of GC and precursor lesions and showed higher sensitivity than serum tumor markers.
    Type of Medium: Online Resource
    ISSN: 1073-2748 , 1073-2748
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2020
    detail.hit.zdb_id: 2004182-2
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  • 7
    In: Diagnostic Cytopathology, Wiley, Vol. 46, No. 3 ( 2018-03), p. 213-220
    Abstract: Liquid‐based cytology (LBC) has replaced the conventional Papanicolaou test in cervical cancer screening. The cervical swab specimens collected in LBC media can also be used for additional analyses including high‐risk HPV (HR‐HPV) test, DNA methylation analysis, and HPV E6/E7 mRNA test. Methods The stability, integrity, and recovery rate of cellular DNA and RNA after storage at different conditions were evaluated by a quantitative real‐time PCR (qPCR) based HR‐HPV test, reverse transcription qPCR (RT‐qPCR), and agarose gel electrophoresis. Cervical swab specimens collected in a newly developed LBC medium, VersaMedium, and ThinPrep PreservCyt medium were processed on Hologic ThinPrep 5000 instrument. Results Cervical exfoliative cells fixed by VersaMedium exhibited good cellular morphology with intact membranes and delineated chromatin structures. Cellular DNA preserved in VersaMedium exhibited high level of stability at both room temperature and 4°C, and remained mostly intact at 4°C for up to 28 days. Cellular RNA preserved in VersaMedium maintained higher level of stability and integrity at 4°C than at room temperature. VersaMedium also showed no apparent adverse effect on the recovery rate of nucleic acids. Conclusion In addition to maintaining cellular morphology, when stored at 4°C, VersaMedium preserves cellular nucleic acids and PreservCyt medium without noticeable adverse effects on the recovery rate during purification. Therefore, VersaMedium is an appropriate LBC medium for the collection and preservation of cervical swab specimens. And VersaMedium preserved cellular nucleic acids are of such high quality that they are suitable for HR‐HPV qPCR test and RT‐qPCR analyses.
    Type of Medium: Online Resource
    ISSN: 8755-1039 , 1097-0339
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2018
    detail.hit.zdb_id: 2001251-2
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  • 8
    Online Resource
    Online Resource
    SAGE Publications ; 2019
    In:  The International Journal of Biological Markers Vol. 34, No. 1 ( 2019-03), p. 54-59
    In: The International Journal of Biological Markers, SAGE Publications, Vol. 34, No. 1 ( 2019-03), p. 54-59
    Abstract: Colorectal cancer is one of the five most common cancers in China, and its incidence is steadily increasing. An accurate and non-invasive screening method is needed to increase the population uptake of colorectal cancer screening. Secreted frizzled-related protein 2 ( SFRP2) has been found to be hypermethylated in most colorectal cancer patients, and it may fulfill the role of a non-invasive biomarker for colorectal cancer screening. Methods: Methylation status of SFRP2 was examined in 17 cancer tissues and paired adjacent paracancer tissues by a new SFRP2 MethyLight assay, which was also used to test the serum of 62 patients with colorectal cancer and 55 normal individuals. Results: The limit of detection of the SFRP2 MethyLight assay was about 200 pg per reaction. The SFRP2 methylation level was higher in 94.1% colorectal cancer tissues than in paired adjacent paracancer tissues ( P 〈 0.001). The sensitivity and specificity of SFRP2 for detecting colorectal cancer in serum were 69.4% (95% confidence interval (CI) 56.2, 80.1%) and 87.3% (95% CI 74.9, 94.3%), respectively. Conclusion: SFRP2 methylation in serum has the potential to be a non-invasive biomarker for colorectal cancer screening.
    Type of Medium: Online Resource
    ISSN: 1724-6008 , 1724-6008
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2019
    detail.hit.zdb_id: 1475778-3
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  • 9
    In: Insects, MDPI AG, Vol. 12, No. 10 ( 2021-09-30), p. 890-
    Abstract: The pathogenicity of different concentrations of Bombyx mori nuclear polyhedrosis virus- Zhenjiang strain (BmNPV ZJ) and Yunnan strain (BmNPV YN) was assessed in Baiyu larvae. The structures of the two viral strains were observed by negative-staining electron microscopy, and their proliferation was examined by quantitative polymerase chain reaction (qPCR). The genomic sequences of these two viruses were obtained to investigate the differences in their pathogenicity. The lethal concentration 50 (LC50) of BmNPV ZJ against Baiyu larvae was higher than that of BmNPV YN, indicating a relatively more robust pathogenicity in BmNPV YN. Electron microscopic images showed that the edges of BmNPV YN were clearer than those of BmNPV ZJ. The qPCR analysis demonstrated significantly higher relative expressions of immediately early 1 gene (ie-1), p143, vp39, and polyhedrin genes (polh) in BmNPV ZJ than in BmNPV YN at 12–96 h. The complete genomes of BmNPV ZJ and BmNPV YN were, respectively, 135,895 bp and 143,180 bp long, with 141 and 145 coding sequences and 40.93% and 39.71% GC content. Considering the BmNPV ZJ genome as a reference, 893 SNP loci and 132 InDel mutations were observed in the BmNPV YN genome, resulting in 106 differential gene sequences. Among these differential genes, 76 (including 22 hub genes and 35 non-hub genes) possessed amino acid mutations. Thirty genes may have been related to viral genome replication and transcription and five genes may have been associated with the viral oral infection. These results can help in understanding the mechanisms of pathogenicity of different strains of BmNPV in silkworms.
    Type of Medium: Online Resource
    ISSN: 2075-4450
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 2662247-6
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  • 10
    In: Gene, Elsevier BV, Vol. 764 ( 2021-01), p. 145095-
    Type of Medium: Online Resource
    ISSN: 0378-1119
    RVK:
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
    detail.hit.zdb_id: 1491012-3
    SSG: 12
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