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Ref Type Journal Article
PMID (32988960)
Authors Yap TA, Tan DS, Terbuch A, Caldwell R, Guo C, Goh BC, Heong V, Haris NRM, Bashir S, Drew Y, Hong DS, Meric-Bernstam F, Wilkinson G, Hreiki J, Wengner AM, Bladt F, Schlicker A, Ludwig M, Zhou Y, Liu L, Bordia S, Plummer R, Lagkadinou E, de Bono JS
Title First-in-Human Trial of the Oral Ataxia Telangiectasia and Rad3-Related Inhibitor BAY 1895344 in Patients with Advanced Solid Tumors.
Journal Cancer discovery
Vol
Issue
Date 2020 Sep 28
URL
Abstract Text Targeting the ataxia telangiectasia and Rad3-related (ATR) enzyme represents a promising anticancer strategy for tumors with DNA damage response (DDR) defects and replication stress, including inactivation of ataxia telangiectasia mutated (ATM) signaling. We report the dose-escalation portion of the phase I first-in-human trial of oral ATR inhibitor BAY 1895344 intermittently dosed 5-80 mg twice daily (BID) in 21 patients with advanced solid tumors. The maximum tolerated dose was 40 mg BID 3 days on/4 days off. Commonest adverse events were manageable and reversible hematological toxicities. Partial responses were achieved in 4 patients and stable disease in 8 patients. Median duration of response was 315.5 days. Responders had ATM protein loss and/or deleterious ATM mutations and received doses greater than or equal to 40 mg BID. Overall, BAY 1895344 is well tolerated with antitumor activity against cancers with certain DDR defects, including ATM loss. An expansion phase continues in patients with DDR deficiency.

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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 I2629fs ATM neg endometrial clear cell adenocarcinoma predicted - sensitive BAY1895344 Case Reports/Case Series Actionable In a Phase I trial, BAY1895344 treatment resulted in a partial response with a 53% decrease in tumor size in a patient with clear cell endometrial cancer harboring ATM I2629fs with ATM protein loss, treatment was ongoing at 433 days (PMID: 32988960; NCT03188965). 32988960
ATM inact mut Advanced Solid Tumor predicted - sensitive BAY1895344 Phase I Actionable In a Phase I trial, BAY1895344 treatment was tolerated and resulted in an objective response rate of 36.4% (4/11, all partial responses) and a disease control rate of 63.6% (7/11) in patients with advanced solid tumors harboring ATM inactivating mutations and/or ATM protein expression loss (PMID: 32988960; NCT03188965). 32988960
ATM negative collecting duct carcinoma predicted - sensitive BAY1895344 Case Reports/Case Series Actionable In a Phase I trial, BAY1895344 treatment resulted in a partial response with a 69% decrease in tumor size in a patient with renal collecting duct carcinoma harboring ATM protein loss, treatment was ongoing at 385 days (PMID: 32988960; NCT03188965). 32988960
ATM negative Advanced Solid Tumor predicted - sensitive BAY1895344 Phase I Actionable In a Phase I trial, BAY1895344 treatment was tolerated and resulted in an objective response rate of 36.4% (4/11, all partial responses) and a disease control rate of 63.6% (7/11) in patients with advanced solid tumors harboring ATM inactivating mutations and/or ATM protein expression loss (PMID: 32988960; NCT03188965). 32988960
ATM T2333fs ATM neg Her2-receptor negative breast cancer predicted - sensitive BAY1895344 Case Reports/Case Series Actionable In a Phase I trial, BAY1895344 treatment resulted in a partial response with a 54% decrease in tumor size in a patient with heavily treated, hormone receptor–positive, ERBB2 (HER2)-negative breast cancer harboring ATM T2333fs and ATM protein loss, who remained on treatment for 349 days (PMID: 32988960; NCT03188965). 32988960
ATM V1268fs appendix cancer predicted - sensitive BAY1895344 Case Reports/Case Series Actionable In a Phase I trial, BAY1895344 treatment resulted in a partial response with a 35% decrease in tumor size in a patient with appendix cancer harboring ATM T2333fs, treatment was ongoing at 472 days (PMID: 32988960; NCT03188965). 32988960