What Are the Different Types of Clinical Trials?

There are a variety of types of clinical trials including the following:
Treatment trials - test new treatments.
Prevention trials - look for new ways to keep people healthy
or keep a disease from returning.
Diagnostic trials - look for better ways to diagnose a disease.

Screening trials - look for better ways to detect a disease.

Quality of life trials - look for better ways to improve the
quality of life of people with chronic illnesses.