First-in-man clinical trial of the oral pan-AKT inhibitor MK-206 in patients with advanced solid tumors

Timothy A. Yap, Li Yan, Amita Patnaik, Ivy Fearen, David Olmos, Kyriakos Papadopoulos, Richard D. Baird, Liliana Delgado, Adekemi Taylor, Lisa Lupinacci, Ruth Riisnaes, Lorna L. Pope, Simon P. Heaton, George Thomas, Michelle D. Garrett, Daniel M. Sullivan, Johann S. De Bono, Anthony W. Tolcher

Research output: Contribution to journalArticlepeer-review

459 Scopus citations


Purpose: AKT signaling is frequently deregulated in human cancers. MK-2206 is a potent, oral allosteric inhibitor of all AKT isoforms with antitumor activity in preclinical models. A phase I study of MK-2206 was conducted to investigate its safety, maximum-tolerated dose (MTD), pharmacokinetics (PKs), pharmacodynamics (PDs), and preliminary antitumor efficacy. Patients and Methods: Patients with advanced solid tumors received MK-2206 on alternate days. Paired tumor biopsies were mandated at the MTD for biomarker studies. PD studies incorporated tumor and hair follicle analyses, and putative predictive biomarker studies included tumor somatic mutation analyses and immunohistochemistry for phosphatase and tensin homolog (PTEN) loss. Results: Thirty-three patients received MK-2206 at 30, 60, 75, or 90 mg on alternate days. Dose-limiting toxicities included skin rash and stomatitis, establishing the MTD at 60 mg. Drug-related toxicities included skin rash (51.5%), nausea (36.4%), pruritus (24.2%), hyperglycemia (21.2%), and diarrhea (21.2%). PKs (area under the concentration-time curve from 0 to 48 hours and maximum measured plasma concentration) were dose proportional. Phosphorylated serine 473 AKT declined in all tumor biopsies assessed (P = .015), and phosphorylated threonine 246 proline-rich AKT substrate 40 was suppressed in hair follicles at 6 hours (P = .008), on days 7 (P = .028) and 15 (P = .025) with MK-2206; reversible hyperglycemia and increases in insulin c-peptide were also observed, confirming target modulation. A patient with pancreatic adenocarcinoma (PTEN loss; KRAS G12D mutation) treated at 60 mg on alternate days experienced a decrease of approximately 60% in cancer antigen 19-9 levels and 23% shrinkage in tumor measurements. Two patients with pancreatic neuroendocrine tumors had minor tumor responses. Conclusion: MK-2206 was well tolerated, with evidence of AKT signaling blockade. Rational combination trials are ongoing to maximize clinical benefit with this therapeutic strategy.

Original languageEnglish (US)
Pages (from-to)4688-4695
Number of pages8
JournalJournal of Clinical Oncology
Issue number35
StatePublished - Dec 10 2011
Externally publishedYes

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


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