Mosunetuzumab

Mosunetuzumab is a humanized anti-CD20/CD3 bispecific antibody. It can recognize and bind two different targets simultaneously, CD20 on cancer B-cells and CD3 on T-cells, allowing it to redirect T-cell cytotoxic activity to cancer cells. The standard of care for patients with B-cell lymphoma includes an anti-CD20 monoclonal antibody, such as rituximab, in combination with chemotherapy. However, patients with certain types of B-cell lymphoma, such as follicular lymphoma (FL), chronic lymphocytic leukemia (CLL) or aggressive B-cell lymphoma, have a high probability of relapse or recurrence after treatment. Mosunetuzumab has the potential to circumvent resistance to rituximab in patients with follicular lymphoma, and unlike CAR-T therapies such as axicabtagene ciloleucel and tisagenlecleucel, it is an “off-the-shelf” alternative, readily available to patients. In June 2022, the European Medicines Agency approved mosunetuzumab for the treatment of adult patients with relapsed or refractory (R/R) FL who have received at least two prior systemic therapies. In January 2023, the use of mosunetuzumab was approved by the FDA under accelerated approval based on response rate.