Study of Eryaspase in Combination With Chemotherapy Versus Chemotherapy Alone for the Treatment of TNBC (TRYbeCA-2)

The study will consist of 2 parts: * Part 1 is an open-label, multicenter, randomized Phase 2 exploratory study that will investigate the clinical activity of the combination of eryaspase and gemcitabine/carboplatin in patients with locally recurrent or metastatic TNBC. Data analysis of Part 1 will inform choices for the final design and patient population in Part 2 (Phase 3 study). Patients recruited into Part 1 will not be included in the Intent-to-Treat patient (ITT) population of Part 2 of the study. * Part 2 will be a randomized Phase 3 study designed to evaluate the efficacy of the combination of eryaspase and gemcitabine/carboplatin in TNBC patients. The current protocol will focus on Part 1. Part 1 is the focus of the current protocol, with a primary endpoint of DCR. DCR data as determined by an IRR will determine whether or not proceeding to Part 2 is warranted. If so, Part 2 will be implemented via a major amendment to the protocol. Meanwhile, sites will remain open with the expectation that Part 2 will be activated After providing informed consent and completing the screening assessments, patients who meet all inclusion and no exclusion criteria will be randomized in a 1:1 ratio to one of the following treatment arms: * Arm A (experimental arm): eryaspase 100 U/kg on Days 1 and 8 of combination chemotherapy with gemcitabine/carboplatin, or * Arm B (control arm): gemcitabine/carboplatin combination. Treatment will continue until objective disease progression, unacceptable toxicity, or the patient's withdrawal of consent. A survival follow-up period will include the collection of survival, progression of disease if applicable, subsequent anti-cancer therapy every 12 weeks (± 1 week)