Posoleucel (ALVR105) for the Treatment of Adenovirus Infection in Pediatric and Adult Participants Receiving Standard of Care Following Allogeneic Hematopoietic Cell Transplantation

Number of Participants With Undetectable Adenovirus Infection

Viral load of adenovirus was measured at the central laboratory using quantitative polymerase chain reaction (qPCR) from blood and stool samples at each study visit and on Day 29 from a nasopharyngeal swab. There was a 14-day window for participants who crossed over from posoleucel to placebo; and for participants who crossed over from placebo to posoleucel, the pre-dose cross-over Day 1 viral load was used. Participants missing the primary endpoint but having undetectable viremia before Day 29 and after Day 43 were imputed as successes. Undetectable adenovirus viremia was less than the lower limit of quantification (LLOQ).

Time frame: Day 29 through Day 43 (Day 29 + 14 days; up to 43 days post-first infusion)

Number of Participants Who Experienced Treatment-emergent Adverse Events (TEAEs)

A TEAE was defined as an adverse event (AE) with a start date and time on or after the first dose of study treatment. A serious AE (SAE) was an AE that met at least one of the following serious criteria: fatal, life-threatening, required inpatient hospitalization or prolongation of existing hospitalization; resulted in persistent or significant disability/incapacity; was a congenital anomaly/birth defect; or other important medical event. TEAEs of special interest (AESI) included acute or chronic graft versus host disease, cytokine release syndrome, infusion-related reactions, and graft failure or rejection. Treatment-related refers to the assessment of a relationship between study treatment and the event by the investigator.

Time frame: Up to 34 weeks