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The Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of Single Oral Doses of RO5068760, an MEK Inhibitor, in Healthy Volunteers: Assessment of Target Suppression
Author(s) -
Lee Lucy,
Niu Huifeng,
Goelzer Petra,
Rueger Ruediger,
Deutsch Jonathan,
BusseReid Rachel,
DeSchepper Stefanie,
Blotner Steve,
Barrett Joanne,
Weissgerber Georges,
Peck Richard
Publication year - 2010
Publication title -
the journal of clinical pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 116
eISSN - 1552-4604
pISSN - 0091-2700
DOI - 10.1177/0091270010361254
Subject(s) - tolerability , pharmacodynamics , pharmacokinetics , medicine , pharmacology , adverse effect , ex vivo , in vivo , biology , microbiology and biotechnology
RO5068760, a substituted hydantoin, represents a new class of potent, highly selective, non‐adenosine triphosphate (ATP)–competitive MEK1/2 inhibitors. The study aimed to determine the safety/tolerability, pharmacokinetics, and pharmacodynamics of single ascending doses of RO5068760 in human healthy volunteers. All participants received a single dose followed by 48 hours of pharmacokinetics, pharmacodynamics, and safety/tolerability assessments. The pharmacodynamics were measured by changes in ERK phosphorylation (pERK) in peripheral blood mononuclear cells, ex vivo stimulated by phorbol 12‐myristate 13‐acetate (PMA). Forty‐eight participants received 6 doses (50, 100, 200, 400, 600, 800 mg). RO5068760 was well tolerated up to 800 mg. There were no clinically significant safety findings, including laboratory, electrocardiogram, ophthalmological assessment, and fecal occult blood tests. Of the total 13 adverse events (n = 12), 11 were mild, 2 were moderate, and none were severe, and only 5 were considered by the investigator as possibly related to treatment. RO5068760 was absorbed with a t max of 2 hours. Disposition appeared to be biphasic with a terminal elimination t 1/2 of 5 to 9 hours. The variability was moderate to high, ranging from 38% to 62% for C max and 41% to 69% AUC. Within the dose range tested, pERK inhibition was relatively modest with a mean maximal pERK suppression of 55%.