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.

Mosunetuzumab as monotherapy is indicated for the treatment of adult patients with relapsed or refractory follicular lymphoma (FL) who have received at least two prior systemic therapies.