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- W2480296027 abstract "The Cadherin-6 (CDH6) gene was found to be frequently overexpressed in ovarian and renal cancers, while featuring a lineage-restricted normal tissue expression pattern. We hypothesized that based on the combined observation of frequent overexpression of CDH6 in cancer and a restricted normal tissue expression, CDH6 might be an ideal tumor antigen for targeting using an antibody-drug conjugate (ADC) approach. CHD6-ADC is a fully-human anti-CDH6 IgG1, linked via sulfo-SPDB to the tubulin-binding maytansinoid payload DM4. CDH6-ADC was evaluated across multiple linker-payload combinations with the sulfo-SPDB-DM4 format being selected based on a superior combined profile pertaining to activity, selectivity and tolerability. To gain a broader understanding of CDH6-ADC activity in vivo we profiled the lead candidate against a panel of 31 unselected patient derived ovarian xenograft (PDX) models in a 1×1×1 PDX clinical trial, similar to that described in Gao et al., 2015. In this unbiased high throughput in vivo screen, CDH6-ADC demonstrated robust antitumor activity, with an overall response rate of 39%. Responses were generally durable beyond 150 days and were achieved at doses yielding exposures anticipated to be achievable in humans and observed in PDX models featuring a range of CDH6 expression level and degree of tumor heterogeneity. Retrospective analysis of individual PDX responses and molecular profiling data demonstrate that sensitivity to CDH6-ADC is highly correlated to CDH6 transcript and protein levels. These findings suggest an ability to prospectively identify patients most likely to benefit from this novel targeted therapy. Furthermore, CDH6-ADC demonstrated robust tumor regressions in a representative PDX xenograft model that was refractory to carboplatin/paclitaxel standard of care therapy. These data suggest that CDH6-ADC may benefit both treatment naive patients and patients that have progressed on prior therapy containing tubulin-targeting anti-mitotics. Extending beyond ovarian cancer, we found CDH6 to be frequently overexpressed in renal cancer. CDH6-ADC was active against RCC PDX models featuring patient relevant levels of CDH6 expression. Data described herein suggest that this novel ADC may be an effective treatment for patients with CDH6 expressing tumors, including ovarian and renal cancer - both indications with a high unmet medical need. Citation Format: Carl U. Bialucha, Scott D. Collins, Yeonju Shim, Xiamei Zhang, Roberto Velazquez, Colleen Kowal, Caroline Bullock, Hongbo Cai, Stacy M. Rivera, Julie M. Goldovitz, Esther Kurth, Alice T. Loo, Guizhi Yang, John Green, Lance Ostrom, Matthew J. Meyer, Rebecca Mosher, Hui Gao, Juliet Williams, Emma Lees. In vivo activity of a novel CDH6 targeting antibody-drug conjugate, including population-scale ovarian PDX clinical trial. [abstract]. In: Proceedings of the 107th Annual Meeting of the American Association for Cancer Research; 2016 Apr 16-20; New Orleans, LA. Philadelphia (PA): AACR; Cancer Res 2016;76(14 Suppl):Abstract nr 872." @default.
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- W2480296027 date "2016-07-15" @default.
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- W2480296027 title "Abstract 872: In vivo activity of a novel CDH6 targeting antibody-drug conjugate, including population-scale ovarian PDX clinical trial" @default.
- W2480296027 doi "https://doi.org/10.1158/1538-7445.am2016-872" @default.
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