Study to Assess the Efficacy and Safety of MT-3921 in Subjects With Acute Traumatic Cervical 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 that meet all of the following criteria: * Classified as AIS A, AIS B or AIS C * ISNCSCI neurological level of injury between C4 and C7 (for C4, the subject must have at least 1 point of motor activity between C5 to C7) * UEMS ≤28 at Screening * Body mass index (BMI) \<40 Exclusion Criteria: Additional screening criteria check may apply for qualification: * Any concomitant injury that interferes with the procedures and examinations required by study protocol, including performance, interpretation or validity of neurological examinations * Poly-traumatic Injury as defined by Injury Severity Score (ISS) values \> 25 * Penetrating spinal cord injuries * Complete transection of the spinal cord * 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 * History of anaphylaxis or clinically significant allergic reactions to any medication * History or presence of malignancy within the last 3 years prior to screening * Subjects with current SARS-CoV-2 infection (COVID-19) * Subjects with hereditary fructose intolerance * Psychoactive substance use disorder * Participation in any clinical trial of a new chemical entity within 12 weeks p…