Unasnemab

The purposes of this study is to assess the safety, tolerability, and pharmacokinetics of MT-3921 in subjects with Human T-cell Leukemia Virus Type 1 (HTLV-1)-Associated Myelopathy(HAM).
Subjects meeting eligibility criteria will enter the 6-month double-blind period. Subjects will be randomized in a 2:1 ratio to receive MT-3921 or placebo in a double blind manner.

The purpose of this study is to compare the efficacy and safety of intravenous (IV) infusions of MT-3921 to placebo in subjects with acute traumatic cervical spinal cord injury.
Subjects meeting eligibility criteria will enter the 6-month double-blind period. Subjects will be randomized in a 2:1 ratio to receive MT-3921 or placebo in a double blind manner.