A Study to Evaluate the Safety, Tolerability, PK, PD, and Clinical Activity of EQ001 in Subjects With aGVHD

The study will enroll approximately 100 subjects in two (2) parts: Part A is an open label study and will enroll approximately 40 evaluable subjects with aGVHD across 4 cohorts. The total number of patients will depend on the number of dose escalations necessary to enable a decision to be made on the recommended dose to take forward into Part B of the study. The planned dose escalation will start with cohort 1, where subjects will receive EQ001 administered intravenously every two weeks for a total of 5 doses. Part B is a randomized, double-blind, placebo-controlled study and will enroll approximately 60 additional subjects, randomized in a 2:1 ratio to either active treatment EQ001 (40) or placebo (20). Subjects will receive either EQ001 or placebo administered intravenously every two weeks for a total of 5 doses.