Promising results with expanded UCB product

The 2-year OS rate was 67% in MGTA-456 recipients and 55% in controls (P=0.59).

NMAC recipients

There were significant differences between the 9 NMAC/MGTA-456 recipients and the 132 NMAC historical controls when it came to age (P=0.03), disease type (P<0.01), and disease status (P=0.03).

The median age was 65 (range, 29-70) for MGTA-456 recipients and 53 (range, 6-72) for historical controls. The median weights were 93.4 kg (range, 55-111) and 81.4 kg (range, 22-145), respectively.

Diagnoses among MGTA-456 recipients included acute leukemia (n=1), MDS (n=4), chronic leukemia (n=1), lymphoma (n=1), and “other” (n=2). Diagnoses among historical controls included acute leukemia (n=61), MDS (n=25), chronic leukemia (n=9), lymphoma (n=35), and “other” (n=2).

Eighty-nine percent of MGTA-456 recipients and 49% of historical controls had high-risk disease. Sixty-seven percent and 64%, respectively, were cytomegalovirus seropositive. Sixty-seven percent and 85%, respectively, had a Karnofsky performance score of 90 to 100.

NMAC recipients who received MGTA-456 had superior neutrophil recovery but platelet recovery that was comparable to that of historical controls.

The rate of neutrophil engraftment was 100% in MGTA-456 recipients and 95% in historical controls. The median time to neutrophil engraftment was 7 days and 15 days, respectively (P<0.01).

The rate of platelet engraftment was 56% for MGTA-456 recipients and 77% for historical controls. The median time to platelet engraftment was 107 days and 47 days, respectively (P=0.19).

There was no significant difference between MGTA-456 recipients and historical controls when it came to GVHD or OS.

The incidence of grade 3-4 acute GVHD at 100 days was 43% for MGTA-456 recipients and 15% for controls (P=0.11). The incidence of chronic GVHD at 1 year was 0% and 19%, respectively (P=0.17).

The 2-year OS rate was 44% in MGTA-456 recipients and 49% in controls (P=0.80).

*Wagner JE Jr et al; Phase I/II Trial of StemRegenin-1 Expanded Umbilical Cord Blood Hematopoietic Stem Cells Supports Testing as a Stand-Alone Graft. Cell Stem Cell 2016; 18(1):144-155.