SYD985, a Novel Duocarmycin-Based HER2-Targeting Antibody-Drug Conjugate, Shows Antitumor Activity in Uterine and Ovarian Carcinosarcoma with HER2/Neu Expression
Document Type
Article
Publication Title
Clinical cancer research : an official journal of the American Association for Cancer Research
Abstract
Carcinosarcomas (CS) are highly aggressive gynecologic malignancies containing both carcinomatous and sarcomatous elements with heterogeneous HER2/neu expression. We compared the efficacy of SYD985 (Synthon Biopharmaceuticals BV), a novel HER2-targeting antibody-drug conjugate (ADC), to trastuzumab emtansine (T-DM1, Genentech-Roche) against primary uterine and ovarian CS. Eight primary CS cell lines were evaluated for HER2/neu surface expression by IHC and gene amplification by FISH assays. The in vitro experiments included cytotoxicity, antibody-dependent cellular cytotoxicity (ADCC), proliferation, viability, and bystander killing. In vivo activity was studied in mouse xenograft and patient-derived xenograft (PDX) models. SYD985 and T-DM1 induced similar levels of ADCC against CS cell lines with low and high HER2/neu expression when challanged in the presence of effector cells. In contrast, SYD985 was 7- to 54-fold more potent than T-DM1 in the absence of effector cells. SYD985, unlike T-DM1, was active against CS demonstrating low or heterogeneous HER2/neu expression. Specifically, the mean IC values were 0.060 μg/mL and 3.221 μg/mL (P < 0.0001) against HER2/neu 0/1+ cell lines and 0.013 μg/mL and 0.096 μg/mL (P < 0.0001) against HER2/neu 3+ cell lines for SYD985 versus T-DM1, respectively. Importantly, unlike T-DM1, SYD985 induced efficient bystander killing of HER2/neu 0/1+ tumor cells admixed with HER2/neu 3+ cells. In vivo studies confirmed that SYD985 is more active than T-DM1 in CS and highly effective against HER2/neu expressing xenografts and PDX. SYD985 may represent a novel and highly effective ADC against HER2-expressing CS. Clinical studies with SYD985 in patients harboring chemotherapy-resistant CS with low/moderate and high HER2 expression are warranted. Clin Cancer Res; 23(19); 5836-45. ©2017 AACR.
First Page
5836
Last Page
5845
DOI
10.1158/1078-0432.CCR-16-2862
Publication Date
10-1-2017
Recommended Citation
Menderes, Gulden; Bonazzoli, Elena; Bellone, Stefania; Black, Jonathan; Predolini, Federica; Pettinella, Francesca; Masserdotti, Alice; Zammataro, Luca; Altwerger, Gary; Buza, Natalia; Hui, Pei; Wong, Serena; Litkouhi, Babak; Ratner, Elena; Silasi, Dan-Arin; Azodi, Masoud; Schwartz, Peter E.; and Santin, Alessandro D., "SYD985, a Novel Duocarmycin-Based HER2-Targeting Antibody-Drug Conjugate, Shows Antitumor Activity in Uterine and Ovarian Carcinosarcoma with HER2/Neu Expression" (2017). Obstetrics and Gynecology. 181.
https://scholar.bridgeporthospital.org/obgyn/181
Identifier
28679774 (pubmed); NIHMS890751 (mid); PMC5626613 (pmc); 10.1158/1078-0432.CCR-16-2862 (doi); 1078-0432.CCR-16-2862 (pii)