Merus B.V., a clinical-stage immuno-oncology company, engages in developing bispecific antibody therapeutics. Its lead bispecific antibody candidate is MCLA-128, which is in Phase I/II clinical trials in Europe for the treatment of various solid tumors, including breast, colorectal, and ovarian cancers. The company also develops MCLA-117, a bispecific antibody candidate that is expected to commence a Phase I/II clinical trial for the treatment of patients with acute myeloid leukemia, as well as for the treatment of myelodysplastic syndrome in pre-clinical studies. Its pre-clinical bispecific antibody candidates include MCLA-134, MCLA-114, and MCLA-145, as well as other early research projects. The company has a strategic collaboration with Gustave Roussy to develop innovative bispecific antibodies for therapeutic immuno-oncology applications. Merus B.V. was founded in 2003 and is headquartered in Utrecht, the Netherlands.