Integrative Kinome Profiling Identifies mTORC1/2 Inhibition as Treatment Strategy in Ovarian Clear Cell Carcinoma

Joseph J Caumanns, Katrien Berns, G Bea A Wisman, Rudolf S N Fehrmann, Tushar Tomar, Harry Klip, Gert Jan Meersma, E Marielle Hijmans, Annemiek Gennissen, Evelien W Duiker, Desiree Weening, Hiroaki Itamochi, Roelof Jc Kluin, An K L Reyners, Michael J Birrer, Helga B Salvesen, Ignace Vergote, Els Van Nieuwenhuysen, James D Brenton, Elena I BraicuJolanta Kupryjanczyk, Beata Spiewankiewicz, Lorenza Mittempergher, Rene Bernards, Ate G J van der Zee, Steven de Jong*

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

24 Citaten (Scopus)


Purpose: Advanced-stage ovarian clear cell carcinoma (OCCC) is unresponsive to conventional platinum-based chemotherapy. Frequent alterations in OCCC include deleterious mutations in the tumor suppressor ARID1A and activating mutations in the PI3K subunit PIK3CA. In this study, we aimed to identify currently unknown mutated kinases in patients with OCCC and test druggability of downstream affected pathways in OCCC models.

Experimental Design: In a large set of patients with OCCC (n = 124), the human kinome (518 kinases) and additional cancer-related genes were sequenced, and copy-number alterations were determined. Genetically characterized OCCC cell lines (n = 17) and OCCC patient-derived xenografts (n = 3) were used for drug testing of ERBB tyrosine kinase inhibitors erlotinib and lapatinib, the PARP inhibitor olaparib, and the mTORC1/2 inhibitor AZD8055.

Results: We identified several putative driver mutations in kinases at low frequency that were not previously annotated in OCCC. Combining mutations and copy-number alterations, 91% of all tumors are affected in the PI3K/AKT/mTOR pathway, the MAPK pathway, or the ERBB family of receptor tyrosine kinases, and 82% in the DNA repair pathway. Strong p-S6 staining in patients with OCCC suggests high mTORC1/2 activity. We consistently found that the majority of OCCC cell lines are especially sensitive to mTORC1/2 inhibition by AZD8055 and not toward drugs targeting ERBB family of receptor tyrosine kinases or DNA repair signaling. We subsequently demonstrated the efficacy of mTORC1/2 inhibition in all our unique OCCC patient-derived xenograft models.

Conclusions: These results propose mTORC1/2 inhibition as an effective treatment strategy in OCCC. (C) 2018 AACR.

Originele taal-2English
Pagina's (van-tot)3928-3940
Aantal pagina's13
TijdschriftClinical Cancer Research
Nummer van het tijdschrift16
Vroegere onlinedatum23-apr-2018
StatusPublished - 15-aug-2018

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