Preclinical assessment of the absorption and disposition of the phosphatidylinositol 3-kinase/mammalian target of rapamycin inhibitor GDC-0980 and prediction of its pharmacokinetics and efficacy in human.

Abstract

(S)-1-{4-[2-(2-Amino-pyrimidin-5-yl)-7-methyl-4-morpholin-4-yl-thieno[3,2-d]pyrimidin-6-ylmethyl]-piperazin-1-yl}-2-hydroxy-propan-1-one (GDC-0980) is a potent and selective inhibitor of phosphatidylinositol 3-kinase (PI3K) and mammalian target of rapamycin, two key components of the PI3K pathway, the deregulation of which is associated with the development of many cancers. The objectives of these studies were to characterize the absorption and disposition of GDC-0980 and assess its efficacy in an MCF7-neo/HER2 human breast cancer xenograft model in immunocompromised mice. Studies in parental Madin-Darby canine kidney cells indicated that GDC-0980 had high permeability (P(app) = 18 × 10⁻⁶ cm/s), suggesting good absorption potential. However, it was found to be a P-glycoprotein and breast cancer resistance protein substrate in transfected cells and in knockout mice studies. Plasma protein binding was low, with the fraction unbound ranging from 29 to 52% across species. GDC-0980 hepatic clearance (CL) was predicted to be low in all of the species tested from hepatocyte incubations. The plasma CL of GDC-0980 was low in mouse (6.30 ml · min⁻¹ · kg⁻¹), rat (15.4 ml · min⁻¹ · kg⁻¹), and dog (6.37 ml · min⁻¹ · kg⁻¹) and moderate in cynomolgus monkey (18.9 ml · min⁻¹ · kg⁻¹). Oral bioavailability ranged from 14.4% in monkey to 125% in dog. Predicted human plasma CL and volume of distribution using allometry were 5.1 ml · min⁻¹ · kg⁻¹ and 1.8 l/kg, respectively. Parameters estimated from the pharmacokinetic/pharmacodynamic modeling of the MCF7-neo/HER2 xenograft data indicated that the GDC-0980 plasma concentration required for tumor stasis was approximately 0.5 μM. These parameters, combined with the predicted human pharmacokinetic profile, suggested that 55 mg once daily may be a clinically efficacious dose. GDC-0980 preclinical characterization and the predictions of its human properties supported its clinical development; it is currently in Phase II clinical trials.

• Authors: Laurent Salphati, Jodie Pang, Emile G Plise, Leslie B Lee, Alan G Olivero, Wei Wei Prior, Deepak Sampath, Susan Wong, Xiaolin Zhang
• Journal: Drug metabolism and disposition: the biological fate of chemicals (Drug Metab Dispos) Vol. 40 Issue 9 Pg. 1785-96 (Sep 2012) ISSN: 1521-009X [Electronic] United States
• PMID: 22696419 (Publication Type: Journal Article)

Chemical References

• 1-(4-((2-(2-aminopyrimidin-5-yl)-7-methyl-4-morpholinothieno(3,2-d)pyrimidin-6-yl)methyl)piperazin-1-yl)-2-hydroxypropan-1-one
• ATP Binding Cassette Transporter, Subfamily B
• ATP Binding Cassette Transporter, Subfamily G, Member 2
• ATP-Binding Cassette Transporters
• Abcg2 protein, mouse
• Antineoplastic Agents
• Bridged Bicyclo Compounds, Heterocyclic
• P-glycoprotein 2
• Phosphoinositide-3 Kinase Inhibitors
• Protein Kinase Inhibitors
• Pyrimidines
• multidrug resistance protein 3
• MTOR protein, human
• Phosphatidylinositol 3-Kinase
• ERBB2 protein, human
• Receptor, ErbB-2
• TOR Serine-Threonine Kinases

Topics

• ATP Binding Cassette Transporter, Subfamily B (deficiency, genetics, metabolism)
• ATP Binding Cassette Transporter, Subfamily G, Member 2
• ATP-Binding Cassette Transporters (deficiency, genetics)
• Administration, Oral
• Animals
• Antineoplastic Agents (administration & dosage, blood, pharmacokinetics)
• Area Under Curve
• Biological Availability
• Biotransformation
• Brain (metabolism)
• Breast Neoplasms (drug therapy, enzymology, genetics, pathology)
• Bridged Bicyclo Compounds, Heterocyclic (administration & dosage, blood, pharmacokinetics)
• Cell Membrane Permeability
• Dogs
• Drug Dosage Calculations
• Female
• Half-Life
• Hepatocytes (metabolism)
• Humans
• Injections, Intravenous
• Intestinal Absorption
• Liver (metabolism)
• MCF-7 Cells
• Macaca fascicularis
• Madin Darby Canine Kidney Cells
• Male
• Metabolic Clearance Rate
• Mice
• Mice, Knockout
• Models, Biological
• Phosphatidylinositol 3-Kinase (metabolism)
• Phosphoinositide-3 Kinase Inhibitors
• Protein Binding
• Protein Kinase Inhibitors (administration & dosage, blood, pharmacokinetics)
• Pyrimidines (administration & dosage, blood, pharmacokinetics)
• Rats
• Rats, Sprague-Dawley
• Receptor, ErbB-2 (genetics, metabolism)
• Species Specificity
• TOR Serine-Threonine Kinases (antagonists & inhibitors, metabolism)
• Tissue Distribution
• Transfection
• Xenograft Model Antitumor Assays