Effect of Autograft CD34+ Dose on Outcome in Pediatric Patients Undergoing Autologous Hematopoietic Stem Cell Transplant for Central Nervous System Tumors

• Published in: Transplantation and cellular therapy 2023-06, Vol.29 (6), p.380.e1-380.e9
• Main Authors: Knight, Tristan E., Ahn, Kwang Woo, Hebert, Kyle M., Atshan, Rasha, Wall, Donna A., Chiengthong, Kanhatai, Rotz, Seth J., Fraint, Ellen, Rangarajan, Hemalatha G., Auletta, Jeffery J., Sharma, Akshay, Kitko, Carrie L., Hashem, Hasan, Williams, Kirsten M., Wirk, Baldeep, Dvorak, Christopher C., Myers, Kasiani C., Pulsipher, Michael A., Warwick, Anne B., Lalefar, Nahal Rose, Schultz, Kirk R., Qayed, Muna, Broglie, Larisa, Eapen, Mary, Yanik, Gregory A.
• Format: Article
• Language: English
• Subjects: Antigens, CD34 - analysis; Autograft; Autografts - chemistry; Autologous hematopoietic stem cell transplant; CD34; Central nervous system; Central Nervous System Neoplasms - etiology; Central Nervous System Neoplasms - therapy; Child; Hematopoietic Stem Cell Transplantation - adverse effects; Humans; Medulloblastoma; Neoplasm Recurrence, Local - etiology; Retrospective Studies; TNC
• ISSN: 2666-6367; 2666-6367
• DOI: 10.1016/j.jtct.2023.03.024

Consolidation with autologous hematopoietic stem cell transplantation (HSCT) has improved survival for patients with central nervous system tumors (CNSTs). The impact of the autologous graft CD34+ dose on patient outcomes is unknown. We wanted to analyze the relationship between CD34+ dose, total nucleated cell (TNC) dose, and clinical outcomes, including overall survival (OS), progression-free survival (PFS), relapse, non-relapse mortality (NRM), endothelial-injury complications (EIC), and time to neutrophil engraftment in children undergoing autologous HSCT for CNSTs. A retrospective analysis of the CIBMTR database was performed. Children aged 3.6×106/kg CD34+ cells experienced superior PFS (p = .04) and OS (p = .04) compared to children receiving ≤3.6 × 106/kg. Relapse rates were lower in patients receiving >3.6 × 106/kg CD34+ cells (p = .05). Higher CD34+ doses were not associated with increased NRM (p = .59). Stratification of CD34+ dose by quartile did not reveal any statistically significant differences between quartiles for 3-year PFS (p = .66), OS (p = .29), risk of relapse (p = .57), or EIC (p = .87). There were no significant differences in patient outcomes based on TNC, and those receiving a TNC >4.4 × 108/kg did not experience superior PFS (p = .26), superior OS (p = .14), reduced risk of relapse (p = .37), or reduced NRM (p = .25). Children with medulloblastoma had superior PFS (p < .001), OS (p = .01), and relapse rates (p = .001) compared to those with other CNS tumor types. Median time to neutrophil engraftment was 10 days versus 12 days in the highest and lowest infused CD34+ quartiles, respectively. For children undergoing autologous HSCT for CNSTs, increasing CD34+ cell dose was associated with significantly improved OS and PFS, and lower relapse rates, without increased NRM or EICs.