A Study of Efficacy and Safety of LAG525 in Combination With Spartalizumab, or With Spartalizumab and Carboplatin, or With Carboplatin, in Patients With Advanced Triple-negative Breast Cancer

Inclusion Criteria:

* Had advanced (loco-regionally recurrent not amenable to curative therapy or metastatic) breast cancer
* Had adequate bone marrow and organ function.
* Had an Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1
* Had measurable disease, i.e., at least one measurable lesion as per RECIST 1.1 criteria (Tumor lesions previously irradiated or subjected to other loco-regional therapy was to be considered measurable if disease progression at the treated site after completion of therapy is clearly documented)
* Progressed after adjuvant or 1 prior systemic treatment in the metastatic setting. Patients with de novo metastatic disease were eligible if they received 1 prior line of therapy
* Had received prior systemic treatment that included taxane-based chemotherapy for adjuvant or metastatic disease
* Had a site of disease amenable to biopsy, and was willing to undergo a new tumor biopsy at screening and during therapy on this study, the latter if medically feasible. Patients with an available archival tumor tissue did not need to perform a tumor biopsy at screening if patient had not received anti-cancer therapy since the biopsy was taken.
* Had histologically and/or cytologically confirmed diagnosis of advanced TNBC (based on most recently analyzed biopsy from locally recurrent or metastatic site, local lab) meeting the following criteria: HER2 negative in situ hybridization test or an IHC status of 0 or 1+, and ER and PR expression was \<1 percent as determined by immunohistochemistry (IHC)

Exclusion Criteria:

* Had received prior immune checkpoint inhibitors as anticancer treatment such as anti-LAG-3, anti-PD-1, anti-PD-L1, or anti-PD-L2 antibody (any line of therapy)
* Received prior neoadjuvant or adjuvant therapy with a platinum agent or mitomycin and experienced recurrence within 12 months after the end of the platinum-based or mitomycin containing therapy or received Platinum or mitomycin for metastatic disease
* Had major surgery within 14 days prior to starting study treatment or had not recovered to grade 1 or less from major side effects
* Presence of CTCAE grade 2 toxicity or higher due to prior cancer therapy. Exception to this criterion; patients with any grade of alopecia were allowed to enter the study.
* Had received radiotherapy ≤ 4 weeks prior to randomization (≤ 2 weeks for limited field radiation for palliation), and had not recovered to grade 1 or better from related side effects of such therapy (with the exception of alopecia)
* Had a known hypersensitivity to other monoclonal antibodies, platinum-containing compounds, or to any of the excipients of LAG525, spartalizumab, or carboplatin
* Had symptomatic central nervous system (CNS) metastases or CNS metastases that required local CNS-directed therapy (such as radiotherapy or surgery), or increasing doses of corticosteroids within the 2 weeks prior to first dose of study treatment. Patients with treated brain metastases would be neurologically stable and without CNS progression for at least 12 weeks prior to randomization and had discontinued corticosteroid treatment (with the exception of \< 10 mg/day of prednisone or equivalent for an indication other than CNS metastases) for at least 4 weeks before first dose of any study treatment
* Had clinically significant cardiac disease or impaired cardiac function