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B43(anti-CD 19)-Gen i stein Immunotherapy<br />

of B-Lineage ALL <strong>and</strong> NHL<br />

Yoav Messinger, Fatih M. Uckun<br />

Parker Hughes Cancer Center <strong>and</strong> Drug Discovery Program,<br />

Departments of Oncology <strong>and</strong> Biotherapy, Hughes Institute, St. Paul, MN;<br />

Biotherapy Program, University of Minnesota, Minneapolis, MN<br />

B43(anti-CD19)-genistein is a CD19 receptor directed protein tyrosine kinase<br />

inhibitor capable of inducing apoptosis in B-lineage leukemia <strong>and</strong> lymphoma cells.<br />

B43-genistein treatment resulted in 100% leukemia-free survival in SCID mice<br />

challenged with an otherwise invariably fatal <strong>and</strong> multidrug-resistant human<br />

leukemia (<strong>Science</strong> 267:886-891, 1995). B45-genistein was very well tolerated by<br />

cynomolgus monkeys at systemic exposure levels that were therapeutic against<br />

human leukemia <strong>and</strong> lymphoma in SCID mice (Clin Cancer Res 4:165-170,1998).<br />

We are currently evaluating the safety of B43-genistein in patients with<br />

relapsed/refractory B-lineage acute lymphoblastic leukemia (ALL) or non-<br />

Hodgkin's lymphoma (NHL). Twenty-three patients have been treated with<br />

escalating doses of B43-genistein, with no dose-limiting toxicity. Objective<br />

responses have been seen in therapy-refractory ALL patients.<br />

633

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