The purpose of this study is to assess the safety, tolerability and pharmacokinetics of MT-3921 in subjects with spinal cord injury.

This is a Phase 1, open-label, single ascending dose study of MT-3921 in subjects with spinal cord injury.

Inclusion Criteria:

Additional screening criteria check may apply for qualification:

• Provide written informed consent prior to beginning any study procedures
• Cervical spinal cord injury, ASIA impairment scale grade A, B, and C with the International Standards for Neurological Classification of Spinal Cord Injury (ISNCSCI) Neurological level of injury between C4 and C8
• Male or female subjects aged between 18 and 65 years
• Body mass index (BMI) <35
• Has had stabilization surgery (if needed) following their SCI and prior to receiving MT-3921

Exclusion Criteria:

Additional screening criteria check may apply for qualification:

• Any concomitant injury that interferes with the performance, interpretation or validity of neurological examinations
• Poly-traumatic Injury as defined by Injury Severity Score (ISS) values > 25
• Penetrating spinal cord injuries
• Traumatic transection of the spinal cord or spinal cord contusion size > 3 cm determined by MRI
• Any other significant pre-existing medical conditions prior to spinal cord injury or current conditions that, in the judgement of the iInvestigator, may increase the risks associated with study participation
• Subjects with HIV, HBV or HCV positive
• Psychoactive substance use disorder
• History or presence of malignancy within the last 5 years prior to screening
• Pregnant or nursing women
• Subjects with hereditary fructose intolerance
• History of anaphylaxis or significant allergy