Definition

Noun: A clinical trial conducted on a larger group of people than in a Phase I trial. Its primary purpose is to evaluate the efficacy of a treatment for the specific medical condition it is intended to treat, while continuing to monitor for possible side effects.

Usage

This term is used specifically in the context of medical research and drug development. It describes a distinct, intermediate stage in the clinical testing process.

Examples

• The new oncology drug has shown promising safety results and will now proceed to a phase II trial.
• Researchers are recruiting 200 patients for the phase II study to determine if the treatment effectively reduces symptoms.
• The phase II clinical trial aims to establish the optimal dosage for efficacy.

Advanced Usage

• Phase II trial: Often used in its full form, "phase II clinical trial," to specify the research context.
• Phase II study: A common synonym for "phase II trial."
• Phase II data: Refers to the results or findings obtained from this stage of testing.
• Randomized phase II trial: A more rigorous design where participants are randomly assigned to receive either the investigational treatment or a control/standard treatment.

Variants and Related Words

• Phase I: The preliminary clinical trial phase focused primarily on assessing safety and dosage in a small group.
• Phase III: The large-scale clinical trial phase that confirms efficacy, monitors side effects, and compares the treatment to standard or placebo treatments.
• Phase IV: Also called post-marketing surveillance, studies conducted after a treatment has been approved for public use.
• Clinical trial: The overarching term for any research study that prospectively assigns human participants to interventions to evaluate health outcomes.

Synonyms

• Efficacy trial (though this is a descriptive term, not a formal synonym)
• Therapeutic exploratory trial

Related Phrases

• To enter phase II: Describes when a drug or treatment advances to this stage of testing.
  • The vaccine candidate has received approval to enter phase II.
• Phase II results: Specifically refers to the outcomes or data from this phase.
  • The published phase II results were encouraging for patients with the rare disease.

Noun

1. a clinical trial on more persons than in phase I; intended to evaluate the efficacy of a treatment for the condition it is intended to treat; possible side effects are monitored