As well as phase 1, 2 and 3 trials, other types of trials include pilot studies, feasibility studies and observational studies.| Cancer Research UK
Clinical trials are medical research studies involving people. They help us to understand more about cancer and how we treat it.| Cancer Research UK
Clinical trials are divided into different phases. Most trials are phase 1, 2 or 3. But some trials are classified as phase 0 and some as phase 4.| Cancer Research UK