Her 1998 dissertation was titled Loss of Uteroglobin Expression in Metastatic Human Prostate Cancer. Steven Patierno was her doctoral advisor.[4] From 1998 to 2000, Weeraratna completed post-graduate training and was a postdoctoral fellow in experimental therapeutics and pharmacology at the Johns Hopkins Sidney Kimmel Comprehensive Cancer Center, then known as the Johns Hopkins Oncology Center.[5] From there, she went on to become a Staff Scientist in the laboratory of Jeff Trent, then Scientific Director of the National Human Genome Research Institute, at the National Institutes of Health.