Reference Detail

Ref Type

Journal Article

PMID

(28945226)

Authors

Bian X, Gao J, Luo F, Rui C, Zheng T, Wang D, Wang Y, Roberts TM, Liu P, Zhao JJ, Cheng H

Title

PTEN deficiency sensitizes endometrioid endometrial cancer to compound PARP-PI3K inhibition but not PARP inhibition as monotherapy.

Journal	Vol	Issue	Date	Pages	Journal Short Title
Oncogene	37	3	2018 01 18	341-351	Oncogene

URL

Abstract Text

Poly (ADP-ribose) polymerase (PARP) inhibitors have emerged as promising cancer therapeutics especially for tumors with deficient homologous recombination (HR) repair. However, as HR-deficient tumors represent only a small fraction of endometrial cancers, the therapeutic utility of PARP inhibitors is limited in this disease. Somatic loss of phosphatase and tensin homolog (PTEN), a tumor suppressor that counteracts phosphoinositide 3-kinase (PI3K) activity, is one of the most common genetic aberrations in endometrioid endometrial cancer. While previous works have identified the role of PTEN in DNA double-strand break repair, vulnerabilities of PTEN-deficient endometrioid endometrial cancers to PARP inhibition remain controversial. Here we find that PTEN-deficient endometrioid endometrial cancer cells are not responsive to PARP inhibitor Olaparib alone, but instead show superior sensitivity to compound inhibition with PI3K inhibitor BKM120, as evidenced by reduced clonogenic cell growth and three-dimensional (3D) spheroid disintegration. Mechanistically, PI3K blockade by BKM120 attenuated HR competency with γH2AX accumulation and reduced RAD51 and BRCA1 expression in Ishikawa, AN3CA and Nou-1 cells, but the same combination treatment led to enhanced phosphorylation of DNA-PK, a non-homologous end joining repair protein, in Hec-108 cells. Furthermore, we show that CRISPR/Cas9-mediated PTEN depletion rendered PTEN wild-type Hec-1A endometrioid endometrial cancer cells responsive to combined inhibition of PARP/PI3K, with concomitantly induced DNA damage accumulation and repair defects. The combination of BKM120 and Olaparib cooperated to inhibit tumor growth in a genetic mouse model of Pten-deficient endometrioid endometrial cancer. Together, these results suggest PI3K inhibition may be a plausible approach to expand the utility of PARP inhibitors to endometrioid endometrial cancers in a PTEN-deficient setting.

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Molecular Profile	Treatment Approach

Gene Name	Source	Synonyms	Protein Domains	Gene Description	Gene Role

Therapy Name	Drugs	Efficacy Evidence	Clinical Trials

Drug Name	Trade Name	Synonyms	Drug Classes	Drug Description

Gene	Variant	Impact	Protein Effect	Variant Description	Associated with drug Resistance

Molecular Profile	Indication/Tumor Type	Response Type	Therapy Name	Approval Status	Evidence Type	Efficacy Evidence	References
PTEN negative	endometrial carcinoma	sensitive	Buparlisib + Olaparib	Preclinical - Cell culture	Actionable	In a preclinical study, the combination of Buparlisib (BKM120) and Lynparza (olaparib) resulted in enhanced DNA damage and growth inhibition in PTEN-deficient endometrial carcinoma cell lines in culture (PMID: 28945226).	28945226
PTEN negative	endometrial carcinoma	no benefit	Olaparib	Preclinical - Cell culture	Actionable	In a preclinical study, Lynparza (olaparib) treatment did not significantly increase DNA damage or inhibit growth of PTEN-deficient endometrial carcinoma cell lines in culture (PMID: 28945226).	28945226
PTEN del	endometrial carcinoma	sensitive	Buparlisib + Olaparib	Preclinical - Cell culture	Actionable	In a preclinical study, the combination of Buparlisib (BKM120) and Lynparza (olaparib) resulted in enhanced DNA damage and growth inhibition in an endometrial carcinoma cell line with PTEN knocked out via CRISPR/Cas9 system in culture (PMID: 28945226).	28945226
PTEN del	endometrial carcinoma	sensitive	Buparlisib	Preclinical - Cell culture	Actionable	In a preclinical study, Buparlisib (BKM120) inhibited Akt signaling, induced DNA damage, and inhibited the growth of an endometrial carcinoma cell line with PTEN knocked out via CRISPR/Cas9 system in culture (PMID: 28945226).	28945226
PTEN del	endometrial carcinoma	no benefit	Olaparib	Preclinical - Cell culture	Actionable	In a preclinical study, Lynparza (olaparib) treatment did not significantly increase DNA damage or inhibit growth of an endometrial carcinoma cell line with PTEN knocked out via CRISPR/Cas9 system in culture (PMID: 28945226).	28945226
PTEN negative	endometrial carcinoma	sensitive	Buparlisib	Preclinical - Cell culture	Actionable	In a preclinical study, Buparlisib (BKM120) inhibited Akt signaling, induced DNA damage, and inhibited the growth of PTEN-deficient endometrial carcinoma cell lines in culture (PMID: 28945226).	28945226