A Study of NOX66 Plus Doxorubicin in Anthracycline-naïve, Adult Patients With Soft Tissue Sarcoma

The study will contain dose-escalation cohorts and dose-expansion cohorts. The study design allows an exploration of different doses of NOX66 with safety monitoring to ensure the safety of the patients. Dose-escalation cohorts: It will include three planned Treatment Groups (800, 1200, 1800 mg daily) and patients enrolled in these groups will receive 7 days of monotherapy treatment with NOX66 followed by a 5-day washout period. Thereafter, patients will enter a combination therapy (only if no significant toxicity is observed during monotherapy). This will commence with Cycle 1, which will consist of 7 days of NOX66, and on Day 2 of the 21-day cycle, doxorubicin will be administered. Patients will continue to be treated for up to 6 x 21-day cycles of NOX66 and doxorubicin. New patients will be entered at the next dose level of NOX66, if no dose-limiting toxicities have occurred among the first 3 patients at the end of cycle 1. During the dose-escalation, MTD of the combination of NOX66 and doxorubicin will be determined. Dose-expansion cohort: On completion of the dose-escalation cohort, patients will be enrolled into a dose-expansion at the MTD of the combination of NOX66 and doxorubicin. All patients will enter directly into 21-day combination cycles and will be given NOX66 therapy for 7 days and doxorubicin will be administered on Day 2 of each cycle. Treatment will be terminated upon disease progression, unacceptable toxicity, or a maximum of 6 cycles.