Old Clinical Trials

Hello! Does anyone know how to get information on former clinical trials done in 1981? I'm not sure of the drug (Mom can remember, thinks it's YU something). Mom was in this trial at Geisinger Medical Center in PA and I'm curious to see how the results turned out. Her cancer came back after 14 years. I'm curious to see how others did.

Penny

Was it 5-FU (5-fluorouracil)? Which is a pretty common chemo drug.
The center should retain that information.