All Or None Case Series

Levels of Evidence for Effectiveness

All or None Case-Series

All or none case-series describe a group of patients who either died before a certain treatment became available or who survived on the treatment. This type of study provides a strong level of evidence, as it shows that the treatment is effective in all cases.

WEB For Example

Levels 1a, 1b, and 1c in the original Levels were replaced with simply 1. 1c All or none Met when all patients died before the Rx became available but some now survive on it.

WEB Levels of Evidence for Effectiveness

Levels of evidence help researchers target their search at the type of evidence that is most likely to provide a reliable.

• A consistent level 1 studies
• B consistent level 2 or 3 studies or extrapolations from level 1.

WEB This First Version of the ESMO Scale of Clinical Actionability for Molecular Targets (ESCAT) Defines Six Levels of...