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Ref Type Abstract
PMID
Authors Alison M. Schram; Vivek Subbiah; Ryan Sullivan; Rasha Cosman; Jia Liu; Eric I. Sbar; Thuy Hoang; Jiarong Chen; Mark Johnson; Vincent Amoruccio; Todd Shearer; Adeela Kamal; Jocelyn Lewis; Wenlin Shao; Badreddin Edris; Lusong Luo; Jayesh Desai
Title Abstract CT031: A first-in-human, phase 1a/1b, open-label, dose-escalation and expansion study to investigate the safety, pharmacokinetics, and antitumor activity of the RAF dimer inhibitor BGB-3245 in patients with advanced or refractory tumors
URL https://aacrjournals.org/cancerres/article/83/8_Supplement/CT031/725418/Abstract-CT031-A-first-in-human-phase-1a-1b-open
Abstract Text Background: BGB-3245 is a RAF dimer inhibitor with preclinical activity in MAPK-altered tumor models harboring BRAF V600 mutations, atypical BRAF mutations/fusions, and RAS mutations. This study is investigating the safety, pharmacokinetics, and preliminary antitumor activity of BGB-3245 in patients (pts) with advanced or refractory MAPK-altered solid tumors. Methods: Eligible pts were ≥18 yrs old with ECOG 0-1 and had solid tumors harboring MAPK pathway alterations. Dose-escalation and cohort-size decisions were made using the Modified Toxicity Probability Interval Design. The starting dose was 5 mg QD. Treatment emergent adverse events (TEAEs) were graded per NCI CTCAE v5.0. Tumor responses were assessed by investigators using RECIST v1.1. Results: As of 1 Sep 2022, 42 pts were treated across 6 cohorts (5-60 mg QD). The median age was 60 yrs; pts had received a median of 3 prior lines of treatment. All pts had TEAEs; 79% had treatment-related (TR) AEs. The most common TRAEs (≥ 10%) were rash acneiform (33%), rash maculopapular (24%), fever (17%), ALT elevations and nausea (both 12%). Gr ≥3 TRAEs were reported in 29% of pts, events in ≥ 2 pts included decreased platelet count and rash maculopapular (3 each), ALT and AST elevations, and fever (2 each). Dose reductions occurred in 5 pts: rhabdomyolysis (1), LVEF decreased (1), hand-foot syndrome (1), rash maculopapular (1), and liver function abnormalities (1). Dose interruptions due to AEs occurred in 60% of pts. Dose discontinuations occurred in 79% of pts, 57% due to disease progression or death, 21% due to AE. Dose limiting toxicities were observed at 10 mg, 40 mg, and 60 mg. 40 mg QD was determined as the MTD. PK results showed generally dose-proportional increases in exposure. Tmax was at ~2 h; BGB-3245 had a long terminal half-life and 7.4-fold average accumulation in exposure at steady-state. 79% of pts were efficacy evaluable. The disease control rate was 48% with 1 CR, 5 cPR, 2 uPR and 8 SD≥24 wks. Objective responders included BRAF V600E melanoma pts post-BRAF/MEK and checkpoint inhibitors (2; 1 CR, 1 cPR), 1 NRAS G12S melanoma and 1 NRAS Q61K melanoma (post checkpoint inhibitors), 1 BRAF V600E LGSOC (progressed on BRAF inhibitor), 1 BRAF V600E cholangiocarcinoma (progressed on BRAF/MEK inhibitors), 1 BRAF K601E/PIK3CA endometrial cancer, and 1 KRAS G12D appendiceal cancer. Preliminary analysis of circulating tumor DNA showed correspondence to clinical response. Conclusions: BGB-3245 has a manageable safety profile and a generally dose-proportional PK. Antitumor activity was observed in pts with no approved targeted therapy options. The safety and early efficacy profile of BGB-3245 supports further investigation in selected MAPK-altered 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
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
NRAS Q61K melanoma predicted - sensitive BGB3245 Case Reports/Case Series Actionable In a Phase I trial, BGB3245 treatment demonstrated manageable safety and resulted in a disease control rate of 48% (16/33,1 complete response, 5 confirmed partial responses (PR), 2 unconfirmed PR, and 8 stable disease > 24 weeks) in patients with advanced solid tumors harboring MAPK pathway alterations, including a partial response in a patient with melanoma harboring NRAS Q61K (Cancer Res (2023) 83 (8_Supplement): CT031). detail...
BRAF V600E ovarian serous carcinoma predicted - sensitive BGB3245 Case Reports/Case Series Actionable In a Phase I trial, BGB3245 treatment demonstrated manageable safety and resulted in a disease control rate of 48% (16/33,1 complete response, 5 confirmed partial responses (PR), 2 unconfirmed PR, and 8 stable disease > 24 weeks) in patients with advanced solid tumors harboring MAPK pathway alterations, including a partial response in a patient with low grade serous ovarian carcinoma harboring BRAF V600E (Cancer Res (2023) 83 (8_Supplement): CT031). detail...
NRAS G12S melanoma predicted - sensitive BGB3245 Case Reports/Case Series Actionable In a Phase I trial, BGB3245 treatment demonstrated manageable safety and resulted in a disease control rate of 48% (16/33,1 complete response, 5 confirmed partial responses (PR), 2 unconfirmed PR, and 8 stable disease > 24 weeks) in patients with advanced solid tumors harboring MAPK pathway alterations, including a partial response in a patient with melanoma harboring NRAS G12S (Cancer Res (2023) 83 (8_Supplement): CT031). detail...
BRAF V600E melanoma predicted - sensitive BGB3245 Case Reports/Case Series Actionable In a Phase I trial, BGB3245 treatment demonstrated manageable safety and resulted in a disease control rate of 48% (16/33,1 complete response, 5 confirmed partial responses (PR), 2 unconfirmed PR, and 8 stable disease > 24 weeks) in patients with advanced solid tumors harboring MAPK pathway alterations, including 1 complete response and 1 confirmed partial response in patients with melanoma harboring BRAF V600E (Cancer Res (2023) 83 (8_Supplement): CT031). detail...
BRAF V600E cholangiocarcinoma predicted - sensitive BGB3245 Case Reports/Case Series Actionable In a Phase I trial, BGB3245 treatment demonstrated manageable safety and resulted in a disease control rate of 48% (16/33,1 complete response, 5 confirmed partial responses (PR), 2 unconfirmed PR, and 8 stable disease > 24 weeks) in patients with advanced solid tumors harboring MAPK pathway alterations, including a partial response in a patient with cholangiocarcinoma harboring BRAF V600E (Cancer Res (2023) 83 (8_Supplement): CT031). detail...