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Rym Ben Abdelwahed, Sabrina Donnou, Hanane Ouakrim, Lucile Crozet, Jérémie Cosette, Alexandra Jacquet, Isabel Tourais, Bénédicte Fournès, Mélanie Gillard Bocquet, Amine Miloudi, Valérie Touitou, Cécile Daussy, Marie-Christine Naud, Wolf Herman Fridman, Catherine Sautès-Fridman, Rémi Urbain, Sylvain Fisson; Preclinical Study of Ublituximab, a Glycoengineered Anti-Human CD20 Antibody, in Murine Models of Primary Cerebral and Intraocular B-Cell Lymphomas. Invest. Ophthalmol. Vis. Sci. 2013;54(5):3657-3665. doi: 10.1167/iovs.12-10316.
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Primary cerebral lymphoma (PCL) and primary intraocular lymphoma (PIOL) belong to the systemic diffuse large B-cell lymphoma family and are characterized by the presence of CD20+ lymphoma B cells in the brain or the eye. These highly aggressive malignancies have a poor prognosis and no specific therapy. The presence of effector immune cells in the damaged brain and vitreous suggests that treatment with anti-human CD20 (hCD20) monoclonal antibodies might be effective. We developed murine models of PCL and PIOL to assess the intracerebral and intraocular antitumor effect of ublituximab, a promising glycoengineered anti-hCD20 mAb with a high affinity for FcγRIIIa (CD16) receptors.
The murine lymphoma B-cell line A20.IIA-GFP-hCD20 (H-2d) was injected into the right cerebral striatum or the vitreous of immunocompetent adult BALB/c mice (H-2d). Four to 7 days later, ublituximab was injected intracerebrally or intravitreously into the tumor site. Rituximab was the reference compound. Survival was monitored for injected mice; histopathological and flow cytometric analyses were performed to study tumor growth and T-cell infiltration.
Single doses of ublituximab, injected intracerebrally or intravitreously, had a marked antitumor effect, more pronounced than that obtained with the same dose of rituximab in these conditions. The reduction in tumor cells was correlated with an increased proportion of CD8+ T cells. This efficacy was observed only against lymphoma B cells expressing hCD20.
These in vivo results confirm the potential of the glycoengineered anti-hCD20 mAb ublituximab as an innovative therapeutic approach to treat primary central nervous system lymphoma and other B-cell lymphomas.
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