title: The phase III trial in the era of targeted therapy: unraveling the "go or no go" decision.
abstract: OBJECTIVE
  To review characteristics of contemporary phase III oncology trials and create an explicit framework to help clinical researchers prioritize novel therapies for phase III testing.
  
  
  METHODS
  We searched the MEDLINE and EMBASE databases for all reviews of phase III trials; cataloged all phase III trials in two national clinical trial databases; and reviewed approval criteria of recently approved oncology drugs from public data provided by the US Food and Drug Administration. Industry data not available elsewhere in the medical literature were obtained from a sourcebook published by a large contract research organization.
  
  
  RESULTS
  Phase III oncology trials are the most expensive and time-consuming aspect of the drug development process. The results of these trials continue to exert the greatest influence on the treatment decision of oncologists and remain pivotal to the granting of drug approval. Making optimal decisions about which agents to advance to phase III testing may decrease the overall cost of cancer drug development and limit the number of patients exposed to ineffective drugs. A conceptual decision model for prioritizing novel therapies for phase III testing is presented.
  
  
  CONCLUSIONS
  Cancer drug development has become more complex and expensive, whereas overall clinical progress remains slow. The transition from phase II to phase III requires a strategic decision that is based on new considerations. A greater investment in phase I and II drug trials may be required to provide the information necessary for phase III planning.
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology*; D017326:Clinical Trials, Phase III as Topic; D016208:Databases, Factual; D003661:Decision Support Techniques; D006801:Humans; D012107:Research Design
chemical_list: D000970:Antineoplastic Agents