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

"NOX66 800 mg (400 mg suppository twice daily \[BID\]).~Monotherapy: 7 days of NOX66 followed by 5 days washout. Combination therapy: 7 days of NOX66 followed by 14 days washout in a 21-day cycle, for up to 6 cycles."

"NOX66 1200 mg daily (600 mg suppository BID).~Monotherapy: 7 days of NOX66 followed by 5 days washout. Combination therapy: 7 days of NOX66 followed by 14 days washout in a 21-day cycle, for up to 6 cycles."

"NOX66 1800 mg daily (600 mg suppository thrice daily).~Monotherapy: 7 days of NOX66 followed by 5 days washout. Combination therapy: 7 days of NOX66 followed by 14 days washout in a 21-day cycle, for up to 6 cycles."

MTD of the combination of NOX66 and doxorubicin will be determined in the dose-escalation cohort of the study. The selected dose will be administered in combination with Doxorubicin.

Doxorubicin will be given at 75 mg/m\^2 as an intravenous infusion on Day 2 of the 21-day cycle for up to 6 cycles.