Definition

Noun: A phase I clinical trial is the first stage of testing a new drug or invasive medical device in a small group of human volunteers. Its primary goals are to assess the safety profile, determine a safe dosage range, and identify potential side effects. It is not designed to test how effective the treatment is.

Usage

This term is used specifically in the context of medical research and drug development. - It is a formal, technical term. - It is often written with Roman numerals (Phase I) or as "phase 1". - It describes a critical, early step in the clinical research process.

Examples

• Noun:
  • The experimental vaccine will first be evaluated in a phase I clinical trial involving 20 healthy volunteers.
  • Before a drug can be tested for efficacy, it must pass a phase I clinical trial to establish its safety.
  • The primary endpoint of the phase I clinical trial was to determine the maximum tolerated dose.

Advanced Usage

• "To enter phase I": To begin the first stage of human clinical testing.
  • The compound, which showed promise in animals, is now ready to enter phase I.
• "Phase I data": The safety and pharmacokinetic results collected from this initial trial stage.
  • The company will release the phase I data at the oncology conference next month.

Variants and Related Words

• Phase I study: A synonymous term for a phase I clinical trial.
• Phase I/II trial: A combined trial design that evaluates both safety (Phase I goals) and preliminary efficacy (Phase II goals).
• First-in-human trial: Another term emphasizing that it is the initial test of a drug in people.
• Dose-escalation study: A common design within a phase I trial where participants receive gradually increasing doses to find the safest maximum dose.

Synonyms

• First-in-human study
• Dose-finding study (emphasizes one of its key objectives)
• Early-stage clinical trial

Related Phrases

• To conduct a phase I trial: To carry out this specific type of research.
  • The research team received approval to conduct a phase I trial.
• Phase I participant/volunteer: An individual who takes part in this initial safety study.
  • All phase I participants are closely monitored for any adverse reactions.

Related Idioms/Concepts

• Bench-to-bedside: This phrase describes the translational process of moving a discovery from the laboratory bench to clinical trials (like a phase I trial) and eventually to the patient's bedside.
• Safety and tolerability: This is the core focus and common outcome measure reported from a phase I clinical trial.

Noun

1. a clinical trial on a few persons to determine the safety of a new drug or invasive medical device; for drugs, dosage or toxicity limits should be obtained