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• W2896496903 abstract "Abstract Pyrrolobenzodiazepine dimers (PBD) form cross-links within the minor groove of DNA causing double-strand breaks (DSB). DNA repair genes such as BRCA1 and BRCA2 play important roles in homologous recombination repair of DSB. We hypothesized that PBD-based antibody–drug conjugates (ADC) will have enhanced killing of cells in which homologous recombination processes are defective by inactivation of BRCA1 or BRCA2 genes. To support this hypothesis, we found 5T4–PBD, a PBD-dimer conjugated to anti-5T4 antibody, elicited more potent antitumor activity in tumor xenografts that carry defects in DNA repair due to BRCA mutations compared with BRCA wild-type xenografts. To delineate the role of BRCA1/2 mutations in determining sensitivity to PBD, we used siRNA knockdown and isogenic BRCA1/2 knockout models to demonstrate that BRCA deficiency markedly increased cell sensitivity to PBD-based ADCs. To understand the translational potential of treating patients with BRCA deficiency using PBD-based ADCs, we conducted a “mouse clinical trial” on 23 patient-derived xenograft (PDX) models bearing mutations in BRCA1 or BRCA2. Of these PDX models, 61% to 74% had tumor stasis or regression when treated with a single dose of 0.3 mg/kg or three fractionated doses of 0.1 mg/kg of a PBD-based ADC. Furthermore, a suboptimal dose of PBD-based ADC in combination with olaparib resulted in significantly improved antitumor effects, was not associated with myelotoxicity, and was well tolerated. In conclusion, PBD-based ADC alone or in combination with a PARP inhibitor may have improved therapeutic window in patients with cancer carrying BRCA mutations." @default.
• W2896496903 created "2018-10-26" @default.
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• W2896496903 date "2019-01-01" @default.
• W2896496903 modified "2023-10-18" @default.
• W2896496903 title "Improved Therapeutic Window in <i>BRCA</i>-mutant Tumors with Antibody-linked Pyrrolobenzodiazepine Dimers with and without PARP Inhibition" @default.
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• W2896496903 doi "https://doi.org/10.1158/1535-7163.mct-18-0314" @default.
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