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Bothell, WA, United States

Outcomes in acute myeloid leukemia (AML) remain unsatisfactory, and novel treatments are urgently needed. One strategy explores antibodies and their drug conjugates, particularly those targeting CD33. Emerging data with gemtuzumab ozogamicin (GO) demonstrate target validity and activity in some patients with AML, but efficacy is limited by heterogeneous drug conjugation, linker instability, and a high incidence of multidrug resistance. We describe here the development of SGN-CD33A, a humanized anti-CD33 antibody with engineered cysteines conjugated to a highly potent, synthetic DNA cross-linking pyrrolobenzodiazepine dimer via a protease-cleavable linker. The use of engineered cysteine residues at the sites of drug linker attachment results in a drug loading of approximately 2 pyrrolobenzodiazepine dimers per antibody. In preclinical testing, SGN-CD33A is more potent than GO against a panel of AML cell lines and primary AML cells in vitro and in xenotransplantation studies in mice. Unlike GO, antileukemic activity is observed with SGN-CD33A in AML models with the multidrug-resistant phenotype. Mechanistic studies indicate that the cytotoxic effects of SGN-CD33A involve DNA damage with ensuing cell cycle arrest and apoptotic cell death. Together, these data suggest that SGN-CD33A has CD33-directed antitumor activity and support clinical testing of this novel therapeutic in patients with AML. Source

Seattle Genetics | Date: 2014-03-12

Disclosed are formulations, including both liquid and lyophilized formulations, comprising a benzodiazepine anti-body-drug conjugate (ADC) and a cyclodextrin. Also disclosed are methods of purifying mixtures comprising benzodiazepine anti-body-drug conjugates and process drug-related impurities.

The application provides methods of diagnosis, prognosis, prophylaxis and treatment of ovarian, pancreatic and other cancers using antibodies that specifically bind to denatured CD70.

Seattle Genetics | Date: 2015-02-05

The present application relates to new derivatives of monomethylauristatin F, substituted on the N terminus by a carboxyalkyl group, processes for preparing these derivatives, their use for the treatment and/or prevention of diseases and to produce medication for the treatment and/or prevention of diseases, particularly hyperproliferative and/or angiogenic disorders such as cancer disorders, for example. Such treatments can occur as monotherapies or in combination with other medication or further therapeutic measures.

Agensys Inc. and Seattle Genetics | Date: 2015-02-27

Antibody drug conjugates (ADCs) that bind to 158P1D7 protein and variants thereof are described herein. 158P1D7 exhibits tissue specific expression in normal adult tissue, and is aberrantly expressed in glioblastoma, lung cancer, bladder cancer, and breast cancer. Consequently, the ADCs of the invention provide a therapeutic composition for the treatment of cancer.

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