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- W4301431214 abstract "Public cord blood banks (CBBs) are required to measure cord blood units (CBUs) potency before their release, allowing for the identification of units that may be unsuitable for haematopoietic transplantation. We have developed a rapid flow cytometry assay based on the measurement of STAT-5 phosphorylation of CD34+ stem cells in response to IL-3 stimulation.To adapt the assay from a research setting to its implementation within our CBB regulated operations, we proceded with a full method validation and a correlation comparison of the IL-3-pSTAT5 assay results with the colony-forming unit assay (CFU) results. A total of 60 CBUs cryopreserved in vials were analysed by flow cytometry to determine the sensitivity, specificity, intra-assay precision, robustness, reproducibility, and inter-laboratory agreement of the assay. The CFU assay was also done on the same samples for comparison purposes.The assay threshold was established at 50% CD34+CD45+pSTAT5+, which provides a 100% sensitivity and a 98.3% specificity. An average intra-assay CV of 7.3% was determined. All results met our qualitative results acceptance criteria regarding the inter-user and inter-laboratory agreements, IL-3 stimulation time, post-thaw incubation delay and staining time. The IL-3-pSTAT5 assay results correlated well with the total CFU determined using the CFU assay (r2 = 0.82, n = 56).This study shows that our rapid flow cytometry assay can be successfully validated and that the potency data obtained display good sensitivity, specificity and robustness. These results demonstrate the feasibility of implementing this assay within CBB operations, as a validated potency assay." @default.
- W4301431214 created "2022-10-05" @default.
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- W4301431214 date "2022-10-04" @default.
- W4301431214 modified "2023-09-28" @default.
- W4301431214 title "Validation of a rapid potency assay for cord blood stem cells using phospho flow cytometry: The <scp>IL‐3‐pSTAT5</scp> assay" @default.
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- W4301431214 doi "https://doi.org/10.1111/ijlh.13975" @default.
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