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Ref Type Journal Article
PMID (31420359)
Authors Piha-Paul SA, Sachdev JC, Barve M, LoRusso P, Szmulewitz R, Patel SP, Lara PN, Chen X, Hu B, Freise KJ, Modi D, Sood A, Hutti JE, Wolff J, O'Neil BH
Title First-in-Human Study of Mivebresib (ABBV-075), an Oral Pan-Inhibitor of Bromodomain and Extra Terminal Proteins, in Patients with Relapsed/Refractory Solid Tumors.
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Abstract Text Bromodomain and extraterminal (BET) proteins play important roles in transcriptional regulation relevant to cancer pathogenesis, and therapeutic targeting/inhibition of BET causes apoptosis of cancer cells in vitro. In this first-in-human study of the pan-BET inhibitor mivebresib (ABBV-075), the safety profile, MTD, and recommended phase II dose (RP2D) were determined in patients with advanced solid tumors.A 3 + 3 dose escalation for different mivebresib dosing schedules [daily, Monday/Wednesday/Friday (M-W-F), 4 days on/3 off (4/7)] was followed by dose expansion in patients with prostate cancer. Endpoints were safety, tolerability, pharmacokinetics, and preliminary antitumor activity.Seventy-two patients with solid tumors (14% uveal melanoma; 11% colorectal; 11% breast; 8% pancreatic; 7% head/neck; 49% others) were treated with mivebresib during dose escalation, and 12 additional patients with prostate cancer in expansion cohort. Most common treatment-emergent adverse events (TEAE) related to mivebresib were dysgeusia (49%), thrombocytopenia (48%), fatigue (26%), and nausea (25%). Most common grade 3/4 TEAEs related to mivebresib were thrombocytopenia (35%) and anemia (6%). Dose-limiting toxicities included thrombocytopenia (2 mg daily; 4.5 mg M-W-F), gastrointestinal bleed (2 mg daily), hypertension (2-3 mg 4/7), fatigue, decreased appetite, and aspartate aminotransferase elevation (4 mg M-W-F). Of 61 evaluable patients from dose escalation, 26 (43%) had stable disease and 35 (57%) had progressive disease. Median progression-free survival was 1.8 months (95% confidence interval, 1.8-1.9).On the basis of safety and tolerability, mivebresib RP2D is 1.5 mg for the daily schedule, 2.5 mg for 4/7, and 3 mg for M-W-F. Mivebresib has a tolerable safety profile, and stable disease was observed in some patients with malignant solid tumors.

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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
Mivebresib Mivebresib 0 2
Drug Name Trade Name Synonyms Drug Classes Drug Description
Mivebresib ABBV-075 BET Inhibitor (Pan) 32 Mivebresib (ABBV-075) is a bromodomain (BET) inhibitor, which may disrupt transcriptional regulation and lead to apaotosis of tumor cells (PMID: 28416490, PMID: 31420359).
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