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Eftilagimod alpha (IMP321), a soluble dimeric recombinant form of LAG-3, is a first-in-class antigen presenting cell activator under clinical development. By stimulating dendritic cells through MHC class II molecules, IMP321 was proven to induce sustained immune responses. Combining active immunotherapy with a standard cytotoxic chemotherapy regimen represents a promising novel strategy that might lead to therapeutic improvements in metastatic breast cancer. Here, we describe the rationale and design of AIPAC (NCT02614833), a double-blind, randomized, multicenter Phase IIb study evaluating IMP321 plus paclitaxel as a first-line chemotherapy compared with paclitaxel plus placebo in hormone receptor-positive metastatic breast cancer patients. The primary end point is progression-free survival and key secondary objectives include overall survival, safety, quality of life and objective response rate.