ALX Oncology Holdings Inc., (“ALX Oncology”) (Nasdaq: ALXO), a clinical-stage immuno-oncology company developing therapies that block the CD47 checkpoint pathway, today announced it has entered into a clinical trial collaboration and supply agreement with Sanofi to evaluate the combination of evorpacept, a next generation CD47 blocker, and SARCLISA (isatuximab-irfc), Sanofi’s monoclonal antibody that targets a specific epitope on the CD38 receptor on multiple myeloma cells, for the treatment of patients with relapsed or refractory multiple myeloma (“RRMM”). SARCLISA is approved in multiple countries, including the U.S., in combination with pomalidomide and dexamethasone for the treatment of patients with multiple myeloma who have received > 2 prior therapies. SARCLISA is also approved in multiple countries in combination with carfilzomib and dexamethasone for the treatment of patients with RRMM who have received 1-3 prior lines of therapy and in the E.U. for patients with multiple myeloma who have received at least 1 prior therapy.

Under the terms of the agreement, Sanofi will conduct a Phase 1/2 study to evaluate the safety, efficacy, pharmacokinetics and biomarker data of evorpacept in combination with SARCLISA and dexamethasone in patients with RRMM. Part 1 will evaluate dosing of evorpacept in combination with standard doses of SARCLISA and dexamethasone to identify a recommended dose. Part 2 will investigate the efficacy and safety of this combination in an expanded population of patients with RRMM. ALX Oncology will supply evorpacept and Sanofi will supply SARCLISA for this study.

“We are thrilled to enter this collaboration with Sanofi that has the potential to advance a new combination therapy for patients with relapsed multiple myeloma who would benefit from novel effective treatment options,” said Jaume Pons, Ph.D., Founder, President and Chief Executive Officer of ALX Oncology. “The combination of blocking both CD47 and CD38 has shown synergistic anti-tumor activity in preclinical studies, and this combination may re-sensitize tumors to anti-CD38 treatment or overcome anti-CD38 resistance. This collaboration expands our robust clinical development pipeline with evorpacept, which we intend to establish as a new and best-in-class foundational immunotherapy in both hematologic and solid tumors.”

“At Sanofi, our vision of chasing the miracles of science is highlighted through partnerships that speak to our commitment of exploring, and developing, new regimens for patients living with multiple myeloma,” stated Helgi Van de Velde, M.D., Ph.D., Head of Hematologic Malignancies Strategies and Late Development, Oncology, Sanofi. “We are excited about this clinical collaboration with ALX Oncology where we will be evaluating the combination of SARCLISA with evorpacept.”

ALX Oncology owns worldwide commercial rights to evorpacept.