Jimeno A, Li J, Messersmith WA, Laheru D, Rudek MA, Maniar M, Hidalgo M, Baker SD, Donehower RC. Phase I study of ON 01910.Na, a novel modulator of the Polo-like kinase 1 pathway, in adult patients with solid tumors.
J Clin Oncol 2008;
26:5504-10. [PMID:
18955447 PMCID:
PMC4824307 DOI:
10.1200/jco.2008.17.9788]
[Citation(s) in RCA: 91] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2008] [Accepted: 07/25/2008] [Indexed: 11/20/2022] Open
Abstract
PURPOSE
We conducted a first-in-man (to our knowledge) phase I study to determine the dose-limiting toxicities (DLTs), characterize the pharmacokinetic profile, and document any antitumor activity of ON 01910.Na, a new chemical entity that arrests cancer cells in G(2)/M by modulating mitotic regulatory pathways including polo-like kinase 1 (Plk1).
PATIENTS AND METHODS
Patients had solid tumors refractory to standard therapy. ON 01910.Na was administered as a 2-hour infusion on days 1, 4, 8, 11, 15, and 18 in 28-day cycles. The starting dose was 80 mg, and an accelerated titration schedule (single-patient cohorts) was used for escalation. Pharmacokinetics were studied on days 1 and 15 of cycle 1.
RESULTS
Twenty patients (11 women and nine men; age 46 to 73 years) were enrolled onto the study. Dose levels of 80, 160, 320, 480, 800, 1,280, 2,080, and 3,120 mg were evaluated in single-patient cohorts. A DLT and additional grade 2 toxicities made the 4,370-mg dose (n = 6) not tolerable, and the next lower dose cohort (3,120 mg) was expanded to six assessable patients. Toxicities were skeletal, abdominal, and tumor pain; nausea; urge to defecate; and fatigue. Hematologic toxicity was infrequent and mild. ON 01910.Na pharmacokinetics were characterized by a rapid distribution phase (distribution half-life, 1 hour) and a relatively slow elimination phase (elimination half-life, 27 hours). A refractory ovarian cancer patient had an objective response after four cycles and remained progression free for 24 months.
CONCLUSION
ON 01910.Na showed a distinct but moderate toxicity pattern. The recommended phase II dose of ON 01910.Na with this schedule of administration is 3,120 mg. Single-agent activity was documented in an ovarian cancer patient.
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