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CDK12 Inhibition Reverses De Novo and Acquired PARP Inhibitor Resistance in BRCA Wild-Type and Mutated Models of Triple-Negative Breast Cancer

Abstract

Although poly(ADP-ribose) polymerase (PARP) inhibitors are active in homologous recombination (HR)-deficient cancers, their utility is limited by acquired resistance after restoration of HR. Here, we report that dinaciclib, an inhibitor of cyclin-dependent kinases (CDKs) 1, 2, 5, and 9, additionally has potent activity against CDK12, a transcriptional regulator of HR. In BRCA-mutated triple-negative breast cancer (TNBC) cells and patient-derived xenografts (PDXs), dinaciclib ablates restored HR and reverses PARP inhibitor resistance. Additionally, we show that de novo resistance to PARP inhibition in BRCA1-mutated cell lines and a PDX derived from a PARP-inhibitor-naive BRCA1 carrier is mediated by residual HR and is reversed by CDK12 inhibition. Finally, dinaciclib augments the degree of response in a PARP-inhibitor-sensitive model, converting tumor growth inhibition to durable regression. These results highlight the significance of HR disruption as a therapeutic strategy and support the broad use of combined CDK12 and PARP inhibition in TNBC.

Type Journal
ISBN 2211-1247 (Electronic)
Authors Johnson, S. F.; Cruz, C.; Greifenberg, A. K.; Dust, S.; Stover, D. G.; Chi, D.; Primack, B.; Cao, S.; Bernhardy, A. J.; Coulson, R.; Lazaro, J. B.; Kochupurakkal, B.; Sun, H.; Unitt, C.; Moreau, L. A.; Sarosiek, K. A.; Scaltriti, M.; Juric, D.; Baselga, J.; Richardson, A. L.; Rodig, S. J.; D'Andrea, A. D.; Balmana, J.; Johnson, N.; Geyer, M.; Serra, V.; Lim, E.; Shapiro, G. I.;
Publisher Name Cell Reports
Published Date 2016-11-01 00:00:00
Published Volume 17
Published Issue 9
Published Pages 2367-2381
URL http://www.ncbi.nlm.nih.gov/pubmed/27880910
Status Published in-print