Standard and large volume leukapheresis of peripheral blood progenitor cells using the new Spectra Optia continuous mononuclear cell collection protocol
Abstract
Background: The aim of the study was to evaluate and optimize the new protocol for continuous mononuclear cell collection (CMNC) Spectra Optia v. 11 (Terumo) which was used for PBPC collections in patients with haemato-oncological diseases. The results of 159 autologous PBPC collections were evaluated in the case of: (a) well mobilized patients with pre-collection CD 34+ cell concentration in blood higher than 20/μl, (b) only the first collections performed either using CMNC Spectra Optia v. 11 or Cobe Spectra v. 6, v. 7, Terumo (c) collections were performed in the Standard and Large volume Leukapheresis regimen, LVL.
Engraftment data from 56 transplanted patients were assessed. Results: Standard collections were performed in 52 patients.
The yield of CD 34+ cells was high, and no significant differences were found between the numbers of CD 34+ cells prepared using Spectra Optia 8.6 (1.3-41) x 106 and Cobe Spectra 10.9 (1.8-45.6) x 106 /kg b. w. (a = 0.05; p = 0.619). The dependence of CD 34+ cell yield on the pre-collection concentration of CD 34+ cells in blood can be considered as linear with high correlation coefficients in CMNC Spectra Optia R = 0.95, and Cobe Spectra R = 0.93.
LVL collections were performed in 107 patients and there were no significant differences between the numbers of CD 34+ cells prepared using CMNC Spectra Optia 10.9 (2-61.2)x 106 and Cobe Spectra 9.3 (2.4-86) x 106 /kg b.w. (a = 0.05; p = 0.35). The relationship between the pre-collection CD 34+ cell concentration in blood and the numbers of CD 34+ cells collected could also be considered as linear with the correlation coefficients in CMNC Spectra Optia R = 0.93, and Cobe Spectra R = 0.78, respectively.
In LVL, the median platelet loss was significantly lower in CMNC Spectra Optia (45%) than in Cobe Spectra (57%). Twelve patients were transplanted using PBPC prepared in the standard regimen and 44 using PBPC from LVL.
Median time to neutrophil reconstitution in the standard regimen was 11 days for both CMNC Spectra Optia and Cobe Spectra, while platelet reconstitution was 14 days for CMNC and 12 days for Cobe Spectra. The median time to neutrophil and platelets reconstitution in LVL was the same for CMNC Spectra Optia and, corresponding to 11 and 13 days, respectively.
Conclusions: The CMNC Spectra Optia protocol is a modern, efficient and safe system that can be used for both Standard and LVL procedures. In well mobilized patients, a sufficient dose of CD 34+ cells for transplantation could be prepared from one Standard or one LVL procedure.
No serious adverse reactions have been observed.