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- W2165973274 abstract "Positive selection of CD34(+) cells may reduce or eliminate tumor cells contaminating PBSC harvests of breast cancer (BrCa) patients. However, to assess tumor purging accurately methods may be needed that are of higher sensitivity than standard immunocytochemistry (ICC) assays.BrCa-cell depletion, resulting from CD34(+) cell selection, was evaluated using a novel, highly sensitive assay based upon immunomagnetic enrichment with ICC detection in 36 BrCa patients undergoing highdose chemotherapy with autologous PBSC support.The prevalence of BrCa-cell contamination was significantly lower (P = 0.0078) in selected CD34(+) cell fractions (17/35, 49%) from apheresis collections compared with CD34(-) cell fractions (25/35, 71%). In 8/34 (24%) patients, BrCa cells were detected in CD34(-) cell fractions, but not in paired CD34(+) cell fractions. Significantly lower total numbers (P < 0.0005) of BrCa cells were enumerable in CD34(+) cell fractions compared with corresponding apheresis harvests. The median total BrCa-cell content of selected CD34(+) cell fractions with measurable contamination was 22 BrCa cells (range, 6-73 BrCa cells), compared with 3297 BrCa cells (range, 10-98 400 BrCa cells) in apheresis harvests. The median log depletion of BrCa cells achieved by positive CD34(+) cell selection in specimens with detectable contamination both before and after selection was 2.2 (range, 1.7-4.0). Total pre-selection BrCa cell number was significantly predictive (P = 0.004) of residual detectable post-selection contamination.Positive CD34(+) cell selection is an effective tumor purging strategy. The prevalence of PBSC contamination in BrCa patients is substantially higher than formerly appreciated." @default.
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- W2165973274 date "2001-07-01" @default.
- W2165973274 modified "2023-09-26" @default.
- W2165973274 title "Breast tumor contamination of PBSC harvests: tumor depletion by positive selection of CD34+ cells" @default.
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- W2165973274 doi "https://doi.org/10.1080/146532401317070925" @default.
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