Reference Detail

Ref Type

Journal Article

PMID

(39085400)

Authors

Piha-Paul SA, Tseng C, Leung CH, Yuan Y, Karp DD, Subbiah V, Hong D, Fu S, Naing A, Rodon J, Javle M, Ajani JA, Raghav KP, Somaiah N, Mills GB, Tsimberidou AM, Zheng X, Chen K, Meric-Bernstam F

Title

Phase II study of talazoparib in advanced cancers with BRCA1/2, DNA repair, and PTEN alterations.

Journal	Vol	Issue	Date	Pages	Journal Short Title
NPJ precision oncology	8	1	2024 Jul 31	166	NPJ Precis Oncol

URL

Abstract Text

Cancer cells with BRCA1/2 deficiencies are sensitive to poly (ADP-ribose) polymerase (PARP) inhibitors. We evaluated the efficacy of talazoparib in DNA-Damage Repair (DDR)-altered patients. In this phase II trial, patients were enrolled onto one of four cohorts based on molecular alterations: (1) somatic BRCA1/2, (2) other homologous recombination repair pathway, (3) PTEN and (4) germline BRCA1/2. The primary endpoint was a clinical benefit rate (CBR): complete response, partial response or stable disease ≥24 weeks. 79 patients with a median of 4 lines of therapy were enrolled. CBR for cohorts 1-4 were: 32.5%, 19.7%, 9.4% and 30.6%, respectively. PTEN mutations correlated with reduced survival and a trend towards shorter time to progression.Talazoparib demonstrated clinical benefit in selected DDR-altered patients. PTEN mutations/loss patients derived limited clinical benefit. Further study is needed to determine whether PTEN is prognostic or predictive of response to PARP inhibitors.

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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
ATM G1676fs	cholangiocarcinoma	predicted - sensitive	Talazoparib	Case Reports/Case Series	Actionable	In a Phase II trial, Talzenna (talazoparib) treatment resulted in a clinical benefit rate (CBR) of 22.8% (18/79, 1 complete and 7 partial responses, 10 with stable disease >/=24 weeks) in patients with advanced solid tumors harboring mutations in DNA damage repair genes, including a partial response lasting 16 weeks in a cholangiocarcinoma cancer patient harboring ATM G1676fs (PMID: 39085400; NCT02286687).	39085400
ATM S1599*	appendix cancer	predicted - sensitive	Talazoparib	Case Reports/Case Series	Actionable	In a Phase II trial, Talzenna (talazoparib) treatment resulted in a clinical benefit rate (CBR) of 22.8% (18/79, 1 complete and 7 partial responses, 10 with stable disease >/=24 weeks) in patients with advanced solid tumors harboring mutations in DNA damage repair genes, including a partial response lasting 12 weeks in an appendiceal cancer patient harboring ATM S1599* (PMID: 39085400; NCT02286687).	39085400
PTEN loss	Advanced Solid Tumor	no benefit	Talazoparib	Phase II	Actionable	In a Phase II trial, Talzenna (talazoparib) treatment resulted in limited clinical benefit in patients with advanced solid tumors harboring PTEN deleterious mutations or loss (by IHC), with a clinical benefit rate of 9.4% (1/14, 1 with stable disease >/=24 weeks) and a median overall survival of 8.5 months and a median progression-free survival of 7.7 weeks (PMID: 39085400; NCT02286687).	39085400
PTEN inact mut	Advanced Solid Tumor	no benefit	Talazoparib	Phase II	Actionable	In a Phase II trial, Talzenna (talazoparib) treatment resulted in limited clinical benefit in patients with advanced solid tumors harboring PTEN deleterious mutations or loss (by IHC), with a clinical benefit rate of 9.4% (1/14, 1 with stable disease >/=24 weeks) and a median overall survival of 8.5 months and a median progression-free survival of 7.7 weeks (PMID: 39085400; NCT02286687).	39085400