A Study of DT2216 in Relapsed/Refractory Malignancies

This study is an open-label, first-in-human, dose escalation study in subjects with histologically or cytologically confirmed advanced or metastatic malignancies who are no longer responsive to approved or accepted standard-of-care interventions. The study will consist of a dose escalation phase followed by confirmation of the recommended phase 2 dose (RP2D). Potentially eligible subjects will undergo screening evaluations (up to 28 days prior to study therapy) and those who meet all protocol-defined eligibility criteria will be enrolled into the study. Subjects who fail screening may be re-screened one time following correction or mitigation of the condition that caused the screen failure; there is no time limit on when a subject may be re-screened. Enrolled subjects will receive a single intravenous (IV) infusion of study drug on Days 1 and 4 weekly for at least 4 weeks, with each cycle consisting of 28 days. Treatment duration for an individual subject may continue for a maximum of 1 year, until disease progression, unacceptable toxicity, subject withdrawal, Investigator's decision for a change in treatment strategy for the individual subject, or death. Longer therapy may be considered for individual subjects upon consultation with the Sponsor's Medical Monitor and overall assessment of benefit:risk. Subjects will be followed for safety for 28 days following the administration of the last study treatment.