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Get Free AccessAbstract Accurately identifying patients with high-grade serous ovarian carcinoma (HGSOC) who respond to poly(ADP-ribose) polymerase inhibitor (PARPi) therapy is of great clinical importance. Here we show that quantitative BRCA1 methylation analysis provides new insight into PARPi response in preclinical models and ovarian cancer patients. The response of 12 HGSOC patient-derived xenografts (PDX) to the PARPi rucaparib was assessed, with variable dose-dependent responses observed in chemo-naive BRCA1/2 -mutated PDX, and no responses in PDX lacking DNA repair pathway defects. Among BRCA1 -methylated PDX, silencing of all BRCA1 copies predicts rucaparib response, whilst heterozygous methylation is associated with resistance. Analysis of 21 BRCA1- methylated platinum-sensitive recurrent HGSOC (ARIEL2 Part 1 trial) confirmed that homozygous or hemizygous BRCA1 methylation predicts rucaparib clinical response, and that methylation loss can occur after exposure to chemotherapy. Accordingly, quantitative BRCA1 methylation analysis in a pre-treatment biopsy could allow identification of patients most likely to benefit, and facilitate tailoring of PARPi therapy.
Olga Kondrashova, Monique Topp, Ksenija Nesic, Elizabeth Lieschke, Gwo‐Yaw Ho, Maria I. Harrell, Giada V. Zapparoli, Alison Hadley, Robert Holian, Emma Boehm, Valerie Heong, Elaine Sanij, Richard B. Pearson, John J. Krais, Neil Johnson, Orla McNally, Sumitra Ananda, Kathryn Alsop, Karla J. Hutt, Scott H. Kaufmann, Kevin Lin, Thomas C. Harding, Nadia Traficante, Georgia Chenevix‐Trench, A. Green, Penelope M. Webb, Dorota M. Gertig, Sián Fereday, Suzanne Moore, Jillian A. Hung, K.R. Harrap, T. Sadkowsky, Nirmala Pandeya, M. Malt, A. Mellon, R. Paul Robertson, T. Vanden Bergh, Milissa U. Jones, P. Mackenzie, J. Maidens, K. Nattress, Yoke-Eng Chiew, Annie Stenlake, Harold C. Sullivan, Brian M. Alexander, P. Ashover, Stephen M. Brown, T. Corrish, L. Green, L. M. Jackman, Kaltin Ferguson, Karla Martin, A. Martyn, B. Ranieri, J. White, V. Jayde, Pam Mamers, Leanne Bowes, Laura Galletta, Daniel A. Giles, Joy Hendley, Thomas Schmidt, H. Shirley, C. Ball, Christian D. Young, S. Viduka, Hang Tran, Sanela Bilic, Lydia Glavinas, Julia Brooks, R. Stuart‐Harris, Fred Kirsten, J Rutovitz, P. Clingan, Akisha Glasgow, Anthony Proietto, Stephen Braye, Geoffrey Otton, Jenny Shannon, Tony Bonaventura, James Stewart, Stephen Begbie, Michael Friedlander, Debra Bell, Sally Baron‐Hay, A. Ferrier, G. Gard, David Nevell, Nick Pavlakis, Susan Valmadre, B. Young, C. Camaris, R. Crouch, L. Edwards, Neville F. Hacker, Donald E. Marsden, G.M. Robertson, Philip Beale, Jane Beith, Jonathan Carter (2018). Methylation of all BRCA1 copies predicts response to the PARP inhibitor rucaparib in ovarian carcinoma. , 9(1), DOI: https://doi.org/10.1038/s41467-018-05564-z.
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Type
Article
Year
2018
Authors
100
Datasets
0
Total Files
0
Language
en
DOI
https://doi.org/10.1038/s41467-018-05564-z
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