dc-88-a and Ovarian-Neoplasms

Epithelial ovarian cancer (EOC) is an aggressive and heterogeneous disease. <10% of EOC demonstrate HER2/neu 3+ receptor over-expression. However, moderate to low (i.e., 2+ and 1+) HER2/neu expression is reported in up to 50% of EOC. The objective of this study was to compare the anti-tumor activity of SYD985, a novel HER2-targeting antibody-drug conjugate (ADC), to trastuzumab emtansine (T-DM1) in EOC models with differential HER2/neu expression.. The cytotoxicity of SYD985 and T-DM1 was evaluated using ten primary EOC cell lines with 0/1+, 2+, and 3+ HER2/neu expression in antibody-dependent cellular cytotoxicity (ADCC), proliferation, viability and bystander killing experiments. Finally, the in vivo activity of SYD985 and T-DM1 was also studied in ovarian cancer xenografts.. SYD985 and T-DM1 induced similar ADCC in the presence of peripheral blood lymphocytes (PBL) against EOC cell lines with differential HER2/neu expression. In contrast, SYD985 was 3 to 42 fold more cytotoxic in the absence of PBL when compared to T-DM1 (p<0.0001). Unlike T-DM1, SYD985 induced efficient bystander killing of HER2/neu 0/1+ tumor cells when admixed with HER2/neu 3+ EOC cells. In vivo studies confirmed that SYD985 is significantly more active than T-DM1 against HER2/neu 3+ EOC xenografts.. SYD985 is a novel ADC with remarkable activity against EOC with strong (3+) as well as moderate to low (i.e., 2+ and 1+) HER2/neu expression. SYD985 is more potent than T-DM1 in comparative experiments and unlike T-DM1, it is active against EOC demonstrating moderate/low or heterogeneous HER2/neu expression.

Topics: Ado-Trastuzumab Emtansine; Adult; Aged; Animals; Antibodies, Monoclonal, Humanized; Antibody-Dependent Cell Cytotoxicity; Antineoplastic Agents, Alkylating; Bystander Effect; Carcinoma, Ovarian Epithelial; Cell Line, Tumor; Duocarmycins; Female; Humans; Immunotoxins; Indoles; Maytansine; Mice; Mice, SCID; Middle Aged; Neoplasms, Glandular and Epithelial; Ovarian Neoplasms; Pyrrolidinones; Random Allocation; Receptor, ErbB-2; Trastuzumab; Xenograft Model Antitumor Assays

Topics: Animals; Antineoplastic Agents; Cell Hypoxia; Cell Line, Tumor; Combined Modality Therapy; Drug Screening Assays, Antitumor; Duocarmycins; Female; Humans; Indoles; Mice; Mice, Nude; Nitro Compounds; Ovarian Neoplasms; Ovary; Pyrrolidinones