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Evaluation of ABT-751 against childhood cancer models in vivo.

AbstractOBJECTIVE:
ABT-751 is a novel antimitotic agent that binds tubulin at the colchicine binding site. ABT-751 is undergoing Phase I trials in children, but has not been evaluated against a range of pediatric tumor models in vivo.
MATERIALS AND METHODS:
ABT-751 was evaluated against 27 subcutaneously implanted xenograft models of childhood cancer including neuroblastoma [4], osteosarcoma [4], Ewing sarcoma [2] rhabdomyosarcoma [8], medulloblastoma [1] and eight kidney cancer lines (six Wilms tumors, two rhabdoid). ABT-751 was administered at 100 mg/kg P.O. on a schedule of 5 days on, 5 days off, 5 days on, repeating the cycle at 21 days. Tumor diameters were measured at 7 day intervals for a period of 12 weeks. Three measures of antitumor activity were used: (1) clinical response criteria [e.g., partial response (PR), complete response (CR), etc.]; (2) treated to control (T/C) tumor volume at day 21; and (3) a time to event measure based on the median event free survival (EFS) of treated and control lines.
RESULTS:
ABT-751 induced regression in 4 of 25 models (16%) including models of neuroblastoma that are refractory to vincristine and paclitaxel. Other regressions occurred in rhabdomyosarcoma and Wilms tumor models. ABT-751 significantly increased event free survival (EFS > 2.0) in eight models (33%) in addition to those with objective responses.
CONCLUSIONS:
ABT-751 demonstrated intermediate activity against this tumor panel. Neuroblastoma models appear somewhat more sensitive to this agent, with objective regressions also in rhabdomyosarcoma and Wilms tumor. ABT-751 was also active in several tumor lines intrinsically refractory to vincristine or paclitaxel.
AuthorsChristopher L Morton, Edward G Favours, Kimberly S Mercer, Claire R Boltz, Jeri Carol Crumpton, Chandra Tucker, Catherine A Billups, Peter J Houghton
JournalInvestigational new drugs (Invest New Drugs) Vol. 25 Issue 4 Pg. 285-95 (Aug 2007) ISSN: 0167-6997 [Print] United States
PMID17384918 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
Chemical References
  • ABT751
  • Antimitotic Agents
  • Sulfonamides
Topics
  • Animals
  • Antimitotic Agents (administration & dosage, therapeutic use)
  • Cell Line, Tumor
  • Child
  • Female
  • Humans
  • Mice
  • Mice, SCID
  • Neoplasms, Experimental (drug therapy)
  • Pediatrics
  • Sulfonamides (administration & dosage, therapeutic use)
  • Xenograft Model Antitumor Assays

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