Predictive Factors for Early Immune Recovery in NHL Patients after Autologous Transplantation: A Multicenter...

Area of Science:

• Hematology
• Immunology
• Oncology

Background:

• Early lymphocyte recovery, defined by absolute lymphocyte count at day 15 (ALC-15) ≥ 0.5 × 10^9/L, is linked to improved outcomes post-autologous hematopoietic stem cell transplantation (AHCT).
• Predicting this early recovery is crucial for managing non-Hodgkin lymphoma (NHL) patients undergoing AHCT.

Purpose of the Study:

• To identify factors associated with achieving an ALC-15 ≥ 0.5 × 10^9/L in 178 NHL patients post-AHCT.
• To evaluate the prognostic significance of early lymphocyte recovery on patient outcomes.

Main Methods:

• Prospective, multicenter study involving 178 NHL patients undergoing AHCT.
• Analysis of mobilization capacity (peak CD34+ cells) and infused graft cellular content (CD3+CD4+ T cells, CD3+CD8+ T cells, NK cells).
• Correlation of these factors with ALC-15 levels and assessment of progression-free survival (PFS) and overall survival (OS).

Main Results:

• Higher peak CD34+ cell mobilization (> 45 × 10^6/L) correlated with increased ALC-15 levels (p=0.020).
• Specific infused graft cell counts predicted ALC-15 ≥ 0.5 × 10^9/L: CD3+CD4+ T cells > 31.8 × 10^6/kg (p<0.001), CD3+CD8+ T cells > 28.8 × 10^6/kg (p=0.017), and NK cells > 4.4 × 10^6/kg (p<0.001).
• Patients achieving ALC-15 ≥ 0.5 × 10^9/L demonstrated significantly better 2-year PFS (74% vs. 57%, p=0.027).

Conclusions:

• Mobilization capacity of CD34+ cells and detailed graft cellular composition are valuable prognostic tools for predicting ALC-15 post-AHCT.
• Achieving early lymphocyte recovery (ALC-15 ≥ 0.5 × 10^9/L) is associated with improved outcomes in NHL patients treated with AHCT.