BI 907828: an MDM2-p53 antagonist
BI 907828* is an oral, small molecule murine double minute 2 (MDM2)-p53 antagonist that may promote p53-mediated cell cycle arrest and apoptosis.1
Clinical trials (monotherapy and combinations): BI 907828 is undergoing investigation in Phase I trials as monotherapy in patients with wild‑type TP53‑enriched solid tumours,2 and in combination with BI 754091* (an investigational programmed cell death protein-1 [PD-1] inhibitor) and BI 754111* (a lymphocyte activation gene 3 [LAG-3] inhibitor).3
The roles of MDM2 and p53
MDM2 is a negative regulator of the tumour suppressor p53.4–7 In non-malignant cells unexposed to stress signals, the auto-regulatory feedback loop between MDM2 and p53 is central to keeping its concentrations low and to limiting aberrant p53 activity.8–10
p53 can be activated in response to a wide variety of stress signals and can mediate downstream cellular responses, including cell cycle arrest, DNA repair, senescence and apoptosis.1,6 In human cancers, the TP53 gene encoding p53 is frequently mutated or deleted (or the function of wild-type p53 protein is inhibited by high MDM2 levels), leading to downregulation of the p53 pathway.6
Previous studies in patients with wild-type p53 tumours suggest that small molecule inhibitors of the MDM2-p53 interaction can activate the p53 pathway and induce cell cycle arrest and apoptosis in tumour cells.11
About BI 907828
BI 907828’s mechanism of action
BI 907828 is a MDM2-p53 antagonist that blocks the interaction between MDM2 and p53 by binding to free MDM2. This prevents MDM2 from inactivating p53, thereby restoring p53 function in tumours with wild-type p53 and inducing target gene expression in processes such as cell cycle arrest and DNA repair, senescence and apoptosis.1,6,7
BI 907828’s mechanism of action4‒7,9
MDM2, molecule murine double minute 2; wt, wild type
BI 907828 in combination
Immune modulation has been shown to contribute to the efficacy of BI 907828, with increase efficacy observed when used in immune-competent (vs immune-deficient) mice in Trp53 wild-type Colon-26 syngeneic mouse tumour models.
BI 907828 has also been shown to act synergistically when used in combination with checkpoint inhibitors. In Trp53 wild-type syngeneic mouse models of cancer, the triple combination of BI 907828 and antibodies against mouse PD-1 and LAG-3 has shown superior efficacy to single and dual agent approaches, achieving response rates of 50–90% and tumour regression.4
BI 907828 plus PD-1 inhibitor mechanism of action4‒7,9
CD, cluster of differentiation; MDM2, molecule murine double minute 2; PD-1, programmed cell death protein-1; Treg, regulatory T cell; wt, wild type.
BI 907828 is currently undergoing clinical investigation as a monotherapy and in combination with the PD-1 inhibitor BI 754091 and the LAG-3 inhibitor BI 754111 in Phase I trials in patients with solid tumours.2,3
In the monotherapy trial, dose escalation is being investigated in a population with TP53 wild-type or unknown status (regardless of MDM2 amplification status), and dose expansion in TP53 wild-type patients with or without MDM2-amplified disease.2
In the combination trial, dose escalation is being performed in the overall patient population, and dose expansion in TP53 wild-type patients with NSCLC (Cohort 1), melanoma (Cohort 2), liposarcoma or undifferentiated pleomorphic sarcoma (Cohort 3), and hepatocellular carcinoma (Cohort 4).3
AE, adverse event; DCR, disease control rate; DLT, dose-limiting toxicity; LAG-3, lymphocyte activation gene 3 protein; MDM2, murine double minute 2; MTD, maximum tolerated dose; ORR, objective response rate; PD-1, programmed cell death protein-1; PFS, progression-free survival; PK/PD, pharmacokinetics/pharmacodynamics.
Boehringer Ingelheim. Data on file.
ClinicalTrials.gov. NCT03449381. https://clinicaltrials.gov/ct2/show/NCT03449381 (Accessed: September 2019).
ClinicalTrials.gov. NCT03964233. https://clinicaltrials.gov/ct2/show/NCT03964233 (Accessed: September 2019).
Rudolph D, et al. Presented at the Annual Meeting of the American Association for Cancer Research 2018. Abstract 4868 and poster.
Rinnenthal J, et al. Presented at the Annual Meeting of the American Association for Cancer Research 2018. Abstract 4865 and poster.
Zhao Y, et al. Acta Biochim Biophys Sin (Shanghai) 2014;46(3):180–9.
Montes de Octa Luna R, et al. Nature 1995;378(6553):203–6.
Ringhausen I, et al. Cancer Cell 2006;10(6):501–14.
Nag S, et al. J Biomed Res 2013;27(4):254–71.
Landré V, et al. Oncotarget 2014;5(18):7988–8013.
Shangary S, et al. Proc Natl Acad Sci USA 2008;105(10):3933–8.
*This is an investigational compound and has not been approved. Its safety and efficacy have not been established.
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Last updated: September 2019
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