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To determine the statistical significance of the observed differential expression between the three specimen groups, SAM analysis was performed.
Using the same microarray data set for our analysis, we have compared the gene expression profiles of prostate cancer, normal appearing prostate tissue adjacent to tumor, and normal appearing prostate tissue from cancer free tissue donors with the aim of identifying the optimal baseline tissue for expression studies and the gene expression changes between the three specimen types.
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The difference between the three specimens was the steel jacketing configuration.
The study design did not allow for determination of the intra- and inter-observer variability of the methods; however, the variability between the three specimens from each specimen was determined to be good (R = 0.684).
The basic premises of most biomarker discovery studies is to use the high data-gathering capabilities of MS to compare biological samples obtained from healthy and disease-afflicted patients and identify proteins that are differentially abundant between the two specimen.
However, there were subtle differences between the two specimen groups regarding the growth of collagen and cartilage cells.
The comparison between the two specimen types yielded lower correlation coefficients (r = 0.45), which was likely due to dominant effects on the RNA related to the tissue processing for FFPE specimens and the different hybridization techniques in DNA microarray protocols.
The most relevant isolated microbes in the ETT lavage fluids were also isolated by inner lumen swabs in 8/11 cases (72%), showing a good concordance between the two specimen collecting methods.
Given the advantages of these alternative sampling techniques and the high concordance between the two specimen types, alternative samples should nevertheless be considered for future CRS research in Sudan.
As a result, 485 differentially expressed probes from FNAB arrays (P < 0.001) and 258 probes from FFPE arrays (P < 0.01) were obtained, of which 39 probes (representing 38 genes) overlapped between the two specimen types.
In expression analysis, while most published prostate studies have used adjacent normals as the baseline tissue, Dhansekaran [ 23], used both commercially available pooled donor normal tissue and adjacent normal tissue and noted differences in expression profile between the two specimen types.
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