Asian Journal of Transfusion Science
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Year : 2018  |  Volume : 12  |  Issue : 2  |  Page : 117-122

Outcome of 51 autologous peripheral blood stem cell transplants after uncontrolled-rate freezing (“dump freezing”) using −80°C mechanical freezer

1 Department of Transfusion Medicine and Hematology, BLK Super Speciality Hospital, New Delhi, India
2 Department of Transfusion Medicine, Super Speciality Pediatric Hospital and Post Graduate Teaching Institute, Noida, Uttar Pradesh, India
3 Department of Hematology, BLK Super Speciality Hospital, New Delhi, India
4 Department of Hemato-Oncology and Bone Marrow Transplant, BLK Super Speciality Hospital, New Delhi, India

Correspondence Address:
Satyam Arora
Department of Transfusion Medicine, Super Speciality Pediatric Hospital and Post Graduate Teaching Institute, Noida, Uttar Pradesh
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ajts.AJTS_42_17

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Background and Objective: Controlled-rate freezing is a complicated, expensive, and time-consuming procedure. Therefore, there is a growing interest in uncontrolled-rate freezing (UCF) with −80°C mechanical freezers for cryopreservation of hematopoietic stem cells. This is a retrospective analysis of efficiency of UCF and outcome of autologous peripheral hematopoietic stem cell (PBSC) transplants at our center from December 2011 to June 2016. Materials and Methods: Cryoprotectant solutions used included 5% dimethyl sulfoxide and 5% albumin with 2% hydroxyethyl starch and stored at −80°C mechanical freezer till transplant. Evaluation of cryopreservation was studied by analyzing the variation in cellularity, viability, and CD34+ stem cell dose recovery as well as clinical follow-up with engraftment. Results: A total of 51 patients (23 females and 28 males) underwent autologous PBSC transplantations with a median age of 31 years (range: 3–60 years) for both hematological and nonhematological indications. Mean recovery post by UCF at −80°C mechanical was 92.9% ± 15.5% for nucleated cells, 86.6% ± 15.5% for viability, and 80% ± 21.5% in CD34+ dose. The median day to neutrophil engraftment was 10 (range 5–14 days) and platelets engraftment was 15 (range 8–45 days). The cryopreserved products were stored at −80°C for median 7 days (range 2-41 day) before transplant. Discussion/Conclusion: Our analysis shows that PBSC can be successfully cryopreserved with mechanical uncontrolled rate freezing. This is a cheap and simple method to freeze the stem cells for a short period in resource-constrained setting.

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2006 - Asian Journal of Transfusion Science | Published by Wolters Kluwer - Medknow
Online since 10th November, 2006