title: Evaluation of the novel mitotic modulator ON 01910.Na in pancreatic cancer and preclinical development of an ex vivo predictive assay.
abstract: The pupose of this study was to evaluate the activity of ON 01910.Na, a mitotic inhibitor, in in vitro and in vivo models of pancreatic cancer and to discover biomarkers predictive of efficacy. Successive in vitro and in vivo models were used; these included cell line-derived and patient-derived tumors from our PancXenoBank, a live collection of freshly generated pancreatic cancer xenografts. ON 01910.Na showed equivalent activity to gemcitabine against pancreatic cancer cell lines in vitro. The activity of the agent correlated with suppression of phospho-CDC25C and cyclin B1. These markers were optimized for a fine-needle aspirate ex vivo rapid assay. Cyclin B1 mRNA evaluation yielded the most optimal combination of accuracy and reproducibility. Next, nine patient-derived tumors from the PancXenoBank were profiled using the assay developed in cell lines and treated with ON01910.Na for 28 days. Two cases were cataloged as potential responders and seven as resistants. There was a correlation between the ex vivo assay and sensitivity to the tested agent, as the two cases prospectively identified as sensitive met prespecified criteria for response. Of the seven tumors of predictive resistant, only one was found to be sensitive to ON 01910.Na. In addition, there was a good correlation between cyclin B1 downregulation ex vivo and changes in cyclin B1 protein post-treatment. The novel mitotic inhibitor, ON 01910.Na, showed activity in preclinical model of pancreatic cancer. A rapid assay was rationally developed that not only identified cases sensitive to ON 01910.Na, but also anticipated the pharmacodynamic events occurring after in vivo exposure.
authors.affiliation: Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore, MD 21231-1000, USA.
authors.forename: A
authors.initials: A
authors.lastname: Jimeno
authors.forename: A
authors.initials: A
authors.lastname: Chan
authors.forename: G
authors.initials: G
authors.lastname: Cusatis
authors.forename: X
authors.initials: X
authors.lastname: Zhang
authors.forename: J
authors.initials: J
authors.lastname: Wheelhouse
authors.forename: A
authors.initials: A
authors.lastname: Solomon
authors.forename: F
authors.initials: F
authors.lastname: Chan
authors.forename: M
authors.initials: M
authors.lastname: Zhao
authors.forename: S C
authors.initials: SC
authors.lastname: Cosenza
authors.forename: M V
authors.initials: MV
authors.lastname: Ramana Reddy
authors.forename: M A
authors.initials: MA
authors.lastname: Rudek
authors.forename: P
authors.initials: P
authors.lastname: Kulesza
authors.forename: R C
authors.initials: RC
authors.lastname: Donehower
authors.forename: E P
authors.initials: EP
authors.lastname: Reddy
authors.forename: M
authors.initials: M
authors.lastname: Hidalgo
mesh_terms: D000818:Animals; D000964:Antimetabolites, Antineoplastic / Q000494:pharmacology* / Q000627:therapeutic use; D044963:Biopsy, Fine-Needle; D045744:Cell Line, Tumor; D019926:Cyclin B / Q000378:metabolism; D056744:Cyclin B1; D003841:Deoxycytidine / Q000031:analogs & derivatives / Q000494:pharmacology / Q000627:therapeutic use; D019008:Drug Resistance, Neoplasm / Q000187:drug effects*; D005260:Female; D005998:Glycine / Q000031:analogs & derivatives* / Q000494:pharmacology / Q000627:therapeutic use; D006801:Humans; D051379:Mice; D008819:Mice, Nude; D010190:Pancreatic Neoplasms / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D011237:Predictive Value of Tests; D013450:Sulfones / Q000494:pharmacology* / Q000627:therapeutic use; D023041:Xenograft Model Antitumor Assays; D020687:cdc25 Phosphatases / Q000378:metabolism; D000093542:Gemcitabine
chemical_list: D000964:Antimetabolites, Antineoplastic; C534699:CCNB1 protein, human; C534700:Ccnb1 protein, mouse; D019926:Cyclin B; D056744:Cyclin B1; D013450:Sulfones; D003841:Deoxycytidine; C507134:ON 01910; C517009:CDC25C protein, human; D020687:cdc25 Phosphatases; D005998:Glycine; D000093542:Gemcitabine