The project aims to conduct a Phase 1b/2 clinical trial using liposomal Annamycin (L-Annamycin) in subjects diagnosed with soft tissue sarcoma (STS) in the stage of unresectable pulmonary dissemination after the failure of at least one line of prior systemic treatment.~The most common localisation of metastatic lesions in STS is the lungs (refer to this as a sanctuary site for STS). Furthermore, although the most common dosing regimen for other anthracyclines (typically, doxorubicin) in the treatment of STS has historically been once every three weeks, preclinical testing of L-Annamycin suggests that weekly dosing of L-Annamycin may be more beneficial, as well as it seems to be both safer and more effective than alternative schedules.~Therefore, this Phase Ib/II clinical trial will test the hypothesis that L-Annamycin administration in monotherapy in the weekly schedule (D1, D8, D15 in 28-day cycles) is safe and has the pharmacodynamic (PD) potential to restore and enhance tumour responses in anthracycline-pre-treated subjects with advanced and/or metastatic STS until disease progression, unacceptable toxicities, or subject consent withdrawal.
This study is a multi-centre, open-label, single-arm, 3+3 Phase 1b/ and Phase II. Phase 1b is aimed to determine the maximum-tolerated dose (MTD)/Recommended Phase 2 Dose (RP2D) based on safety reporting. The RP2D is a multifactorial endpoint that considers toxicity as well as additional determinants (e.g. efficacy, pharmacodynamics) to define the optimal Phase 2 dose. Phase 2 will explore the efficacy of L-Annamycin at RP2D for treating soft tissue sarcomas (STS) subjects with lung metastases, for which chemotherapy is considered appropriate.