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- W2015291366 abstract "Urokinase plasminogen activator (uPA) and its inhibitor (PAI-1) have been shown to be of merit as biomarkers for a variety of cancers. Prostate tissue resections from patients with prostate cancer (PCa) and benign prostatic hyperplasia were analysed to determine the influence of freeze-drying on the recovery of uPA and PAI-1 and their predictive performance.Prostate tissue was frozen in liquid nitrogen and homogenised into a fine powder in a precooled stainless steel punch homogeniser. One aliquot of the powder was extracted directly, and a second aliquot was freeze-dried overnight and then extracted. The extracts were analysed by FEMTELLE assay to determine the concentrations of uPA and PAI-1. uPA/PAI-1 ratios were calculated for each sample, and the mean ratios for the frozen and the lyophilised tissue were compared.The concentrations of uPA measured for the frozen and lyophilised samples are strongly correlated (R = 0.90 ± 0.05). The same applies to the PAI-1 measured (R = 0.89 ± 0.03). The uPA/PAI-1 ratios for the lyophilised and frozen samples were strongly correlated. The uPA/PAI-1 ratios for frozen and lyophilised samples were found to be essentially the same with values of 0.0344 ± 0.0066 and 0.0340 ± 0.0068, respectively (P = 0.9633).The recovery of uPA and PAI-1 from a deep frozen prostate tissue homogenate followed by freeze-drying proceeds with a loss of 10 and 11%, respectively, with no influence on the uPA/PAI-1 ratio. Lyophilisation is a safe procedure for the preservation of frozen prostate tissue samples as it permits recovery of the markers without compromising their use for diagnostic purposes." @default.
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- W2015291366 date "2014-10-29" @default.
- W2015291366 modified "2023-09-26" @default.
- W2015291366 title "Influence of freeze-drying on the recovery of the tumour invasion markers uPA and PAI-1 from prostate cancer resections" @default.
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- W2015291366 doi "https://doi.org/10.1177/0004563214559546" @default.
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