Single-Dose vs. Divided-Dose G-CSF for Stem Cell Mobilization in Healthy Allogeneic Donors

Summary

National and international guidelines/consensus recommend G-CSF (granulocyte colony-stimulating factor) at 10 μg/kg/day as a single daily dose or divided into two daily doses for mobilization in healthy donors for allogeneic hematopoietic stem cell transplantation. However, there is no consensus or standard regarding single versus divided dosing, and high-quality evidence is lacking. Existing randomized controlled trials have small sample sizes and inconsistent conclusions, and none have focused on Asian population characteristics (e.g., body weight and drug metabolism differences). This study aims to provide level I evidence to optimize donor experience and define the optimal administration strategy.

Inclusion criteria: Healthy allogeneic stem cell donors aged 18-60 years, meeting institutional standard donor screening criteria (HLA matching, normal blood counts, normal liver and kidney function, negative infection screening), and providing written informed consent.

Primary endpoint: The rate of achieving a first apheresis yield of ≥ 4 × 10⁶ CD34⁺ cells/kg (donor body weight) after 5 days of G-CSF mobilization.

Secondary endpoints: The rate of achieving ≥ 2 × 10⁶ CD34⁺ cells/kg with at most one apheresis; time to myeloid, platelet, and erythroid engraftment in recipients; the proportion and composition of immune cells (CD34⁺, CD3⁺, CD19⁺, CD56⁺, etc.) in the apheresis product; donor adverse events; donor-reported outcomes; and the difference in CD34⁺ stem cell yields between single-dose and divided-dose mobilization.

Intervention: G-CSF will be administered at a total dose of 10 μg/kg/day, either as a single daily injection or divided into two equal daily injections.

This study is designed to investigate whether single-dose or divided-dose G-CSF administration is superior for mobilizing healthy donors in allogeneic hematopoietic stem cell transplantation.

Conditions

• Healthy Hematopoietic Stem Cell Donor
• Healthy Allogeneic Hematopoietic Stem Cell Donor

Interventions

DRUG

Single-dose Granulocyte colony-stimulating factor (G-CSF)

G-CSF 10 μg/kg administered subcutaneously once daily for 5 days (up to 7 days if needed based on CD34⁺ yield).

DRUG

Divided-dose Granulocyte colony-stimulating factor (G-CSF)

G-CSF 10 μg/kg per day divided into two equal subcutaneous doses daily for 5 days (up to 7 days if needed)

Sponsors & Collaborators

• Second Affiliated Hospital, Zhejiang University, School of Medicine

  collaborator OTHER

• Sir Run Run Shaw Hospital

  collaborator OTHER

• First Affiliated Hospital of Wenzhou Medical University

  collaborator OTHER

• First Affiliated Hospital of Ningbo University

  collaborator NETWORK

• The Affiliated People's Hospital of Ningbo University

  collaborator OTHER_GOV

• Jinhua Central Hospital

  collaborator OTHER

• Xiangya Hospital of Central South University

  collaborator OTHER

• First Affiliated Hospital of Zhejiang University

  lead OTHER

Principal Investigators

• YI LUO · First Affiliated Hospital of Zhejiang University

Study Design

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

NONE

Model

PARALLEL

Eligibility

Min Age

18 Years

Max Age

65 Years

Sex

ALL

Healthy Volunteers

No

Timeline & Regulatory

Start

2026-07-10

Primary Completion

2028-12-01

Completion

2029-07-10

Countries

• China

Study Locations