Abstract:
:MP4CO, developed by Sangart Inc. (San Diego, CA), is a pegylated human hemoglobin-based carbon monoxide (CO) delivery agent and oxygen therapeutic that has shown potential to prevent and reverse red cell sickling. A double blind, comparator controlled, dose-escalation, Phase 1b study was conducted to assess the safety of MP4CO. Adult sickle cell patients with HbSS or S/β(0) Thal genotype who were not experiencing a painful crisis were randomized to receive either MP4CO or normal saline (NS) in a sequential series of six escalating dose cohorts (A-F). In each cohort, three patients received MP4CO (Treatment group) and one patient received NS (Controls). Single IV doses ranged from 15 mg/kg/dose (0.35 mL/kg infusion) to 172 mg/kg/dose (4 mL/kg infusion). Two cohorts received fractionated doses of 172 or 344 mg/kg (4-8 mL/kg, given as two IV infusions, 24 h apart). Overall, 16/24 patients (66.7 %) reported mild to moderate adverse events (AEs); with 13/18 (72 %) in MP4CO group vs. 3/6 (50 %) in NS Controls. No serious adverse events (SAEs) were experienced and no deaths occurred. Most common AEs (reported by >2 patients) included headaches (mild and transient), fatigue and rash at the application site of the Holter electrodes. No treatment-emergent abnormalities in clinical lab values were noted. Vital signs, ECG readings, and pulmonary pressures remained within normal limits. The maximum increase in blood CO-Hb level was ~2 %, which returned to pre-dosing levels within 8 h after dosing. The mean increase in free plasma Hb (an index of MP4CO dose) ranged from 0.20 to 0.35 g/dL in the two highest dose cohorts, with no significant change in total whole blood hemoglobin level. There was no symptomatic or clinical evidence of renal dysfunction in either group based on serum creatinine and urinary albumin results. Two patients had elevated renal biomarkers (β2M and NAG) at Hour 72, which normalized at follow-up visits. Both patients had documented intercurrent illnesses during the study. Further testing of stored urine samples were within normal limits, which suggested the changes were reflective of a generalized inflammatory state rather than direct tubular injury.
journal_name
Adv Exp Med Bioljournal_title
Advances in experimental medicine and biologyauthors
Keipert PE,MP4CO-SCD-105 Study Investigators.doi
10.1007/978-3-319-38810-6_3subject
Has Abstractpub_date
2016-01-01 00:00:00pages
23-29eissn
0065-2598issn
2214-8019journal_volume
923pub_type
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