• Gynecologic oncology · Feb 2020

    In vitro and in vivo activity of sacituzumab govitecan, an antibody-drug conjugate targeting trophoblast cell-surface antigen 2 (Trop-2) in uterine serous carcinoma.

    • Chanhee Han, Emanuele Perrone, Burak Zeybek, Stefania Bellone, Joan Tymon-Rosario, Gary Altwerger, Gulden Menderes, Jacqueline Feinberg, Kaitlin Haines, Mariana Espinal Muller Karger, Anna Bianchi, Luca Zammataro, Aranzazu Manzano, Elena Bonazzoli, Paola Manara, Natalia Buza, Pei Hui, Elena Ratner, Dan-Arin Silasi, Gloria S Huang, Masoud Azodi, Peter E Schwartz, Salvatore Lopez, and Alessandro D Santin.
    • Department of Obstetrics, Gynecology, and Reproductive Sciences Yale University School of Medicine, CT, 06520, USA.
    • Gynecol. Oncol. 2020 Feb 1; 156 (2): 430-438.

    ObjectiveUterine serous carcinoma (USC) is an aggressive variant of endometrial cancer with poor prognosis. Sacituzumab govitecan (SG) is a novel antibody-drug-conjugate (ADC) targeting trophoblast cell-surface antigen 2 (Trop-2), a transmembrane-calcium-signal-transducer, to deliver SN-38, the active metabolite of irinotecan. The objective of this study was to evaluate the expression of Trop-2 in USC and the preclinical activity of SG against primary USC cell-lines and xenografts.MethodsWe used immunohistochemistry (IHC) and flow-cytometry-based assays to evaluate Trop-2 expression and cell-viability in USC tissue and primary tumor-cell-lines after exposure to SG, non-targeting control ADC, and naked antibody hRS7-IgG. Antibody-dependent-cell-cytotoxicity (ADCC) against Trop-2+ and Trop-2- USC cell-lines was evaluated in vitro using 4-hr-Chromium-release-assays. In vivo activity of SG was tested against Trop-2+ USC xenografts by intravenous administration of SG, control ADC, and hRS7.ResultsTrop-2 expression by IHC was detected in 95.1% of USC samples (99/104). Primary tumor cell-lines overexpressing Trop-2 were significantly more sensitive to SG when compared to control ADC (p <0.05). Both SG and hRS7 mediated ADCC in Trop2+ USC cell-lines while no cytotoxicity was detected against Trop-2- cells. SG induced significant bystander killing of Trop-2- tumors when admixed with Trop-2+ tumors. SG caused growth-inhibition and increased survival in SG treated mice harboring Trop-2+ xenografts when compared to controls (p <0.05).ConclusionsSG is remarkably active against USC overexpressing Trop-2 in vitro and in vivo. Our results combined with SG clinical responses recently reported against multiple chemotherapy resistant human tumors further support clinical development of SG in USC patients with advanced/recurrent disease.Copyright © 2019 Elsevier Inc. All rights reserved.

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