There are four possible outcomes from a clinical trial:

Positive trial — The clinical trial shows that the new treatment has a large beneficial effect and is superior to standard treatment.
Non-inferior trial — The clinical trial shows that that the new treatment is equivalent to standard treatment. Also called a non-inferiority trial.
Inconclusive trial — The clinical trial shows that the new treatment is neither clearly superior nor clearly inferior to standard treatment.
Negative trial — The clinical trial shows that a new treatment is inferior to standard treatment.