What is a Phase 2a clinical trial?

Phase 2a Clinical Trials are pilot studies done on a relatively smaller number of patients(100-300) in order to judge the efficacy and safety of the investigational drug. Phase 2 is patient test and dose finding.

What is a Phase 1/2a clinical trial?

A study that tests the safety, side effects, and best dose of a new treatment. Phase I/II clinical trials also test how well a certain type of cancer or other disease responds to a new treatment. Also called phase 1/phase 2 clinical trial.

What are Phase 2 and Phase 3 clinical trials?

Phase 2 trials aim to find out: if the new treatment works well enough to be tested in a larger phase 3 trial. which types of cancer the treatment works for. more about side effects and how to manage them.

What is a Phase II clinical trial NIH?

Phases of Clinical Trials Phase II trials — The experimental drug or treatment is administered to a larger group of people (100–300) to determine its effectiveness and to further evaluate its safety.

Are Phase 2 trials safe?

Key points of phase II clinical trials A group of 25 to 100 patients with the same type of cancer get the new treatment in a phase II study. They’re treated using the dose and method found to be the safest and most effective in phase I studies.

What is difference between Phase 2A and 2B?

Phase 2 studies are sometimes divided into phase 2A and 2B. There are no formal definitions of these divisions, but phase 2A studies are typically more preliminary and can address issues such as dosing and safety, while phase 2B studies are generally ‘mini-phase 3’ studies that provide data on efficacy.

What is the purpose of phase 2 and 3 testing?


Phase Primary goal
Phase I Dose-ranging on healthy volunteers for safety
Phase II Testing of drug on participants to assess efficacy and side effects
Phase III Testing of drug on participants to assess efficacy, effectiveness and safety
Phase IV Post marketing surveillance in public

What is a Phase 3 clinical trial?

A study that tests the safety and how well a new treatment works compared with a standard treatment. For example, phase III clinical trials may compare which group of patients has better survival rates or fewer side effects. Phase III clinical trials may include hundreds of people. Also called phase 3 clinical trial.

What are the 3 types of clinical trials?

Screening trials test new ways for detecting diseases or health conditions. Diagnostic trials study or compare tests or procedures for diagnosing a particular disease or condition. Treatment trials test new treatments, new combinations of drugs, or new approaches to surgery or radiation therapy.

What is the purpose of a Phase 2 clinical trial?

Phase 2a Clinical Trial means a Phase 2 Clinical Trial of a pharmaceutical product, the principal purpose of which is to establish a dose range, appropriate combinations, and further safety and tolerability over a longer duration of dosing, and initial efficacy.

What’s the difference between Phase 2a and 2B trials?

Sometimes phase 2 trials divided into to phase 2A and phase 2B trials. Even though both phases conducted to test the drug efficacy with further safety, types of studies conducted are different for each phase. That is Phase 2A trials known as early phase 2 trials, conducted with pharmaco-dynamics and clinical efficacy as primary end point.

How are high and low doses determined in Phase 2A trials?

Different methods used to select the test doses like equal dose phasing or log dose spacing or using Fibonacci series or by other suggested approaches etc. For example effect produced high dose in phase 2a trial is 900mg. By using equal dose spacing method, calculated medium and low dose will be 600 mg and 300 mg respectively.

What do you mean by Phase 1 research?

A phase of research used to describe exploratory trials conducted before traditional phase 1 trials to investigate how or whether a drug affects the body. They involve very limited human exposure to the drug and have no therapeutic or diagnostic goals (for example, screening studies, microdose studies).