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Positive and negative selection to reduce tumour contamination in peripheral blood stem cell harvests.

Abstract：

:Peripheral blood progenitor cells used during high dose treatments for malignancy may be contaminated with tumour cells that could later contribute to recurrence. CD34+ selected harvests still contain tumour cells and an additional negative selection may be capable of reducing this contamination. We have assessed a two-stage technique in which a CD34+ selection is followed by a tumour specific depletion stage using a B cell or breast cancer specific antibody panel. Initial small-scale selections on 11 patients with NHL and breast cancer showed that cell loss was greatest following the CD34+ selection with a median yield of 38.8 per cent (range 17. 2-56.4 per cent). The addition of the depletion stage resulted in a minimal loss of CD34+ cells with a yield for this step of 94.2 per cent (range 77.5-99.3 per cent). Clinical scale selections were performed on seven patients with CLL and a median of 2.8x10(6)/kg CD34+ cells (range 1.5-6.1x10(6)/kg) were collected. Cell recovery was 53.3 per cent following CD34+ selection and 76.9 per cent following the tumour specific depletion stage, resulting in a final product containing a median of 1.0x10(6)/kg CD34+ cells (range 0. 55-2.0x10(6)/kg). All unmanipulated harvests were heavily contaminated with tumour cells (median contamination 10.2 per cent, range 2.0-83.1 per cent) as measured by flow cytometry and a median 4.7 log (range 3-5 log) tumour cell purge was produced following two-stage selection. Six of the patients have received cells manipulated in this way with median engraftment times of neutrophils>0.5x10(9)/l=16 days (range 13-20 days) and platelets>20x10(9)/l=16.5 days (range 11-42 days). At a median follow-up of 25 months, these transplanted patients remain well and in molecular complete remission.

journal_name

Hematol Oncol

journal_title

Hematological oncology

authors

Davies FE,Rawstron AC,Pratt G,Coupe R,Clarke D,Lubenko A,Short K,Perren TJ,Selby PJ,Maclennan S,Major K,Woodhead V,Robinson F,Child JA,Smith GM,Johnson PW,Morgan GJ

doi

10.1002/1099-1069(200009)18:3<111::aid-hon657>3.0.

subject

Has Abstract

pub_date

2000-09-01 00:00:00

pages

111-20

issue

eissn

0278-0232

issn

1099-1069

pii

10.1002/1099-1069(200009)18:3<111::AID-HON657>3.0.

journal_volume

pub_type

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Positive and negative selection to reduce tumour contamination in peripheral blood stem cell harvests.