Martha Jefferson Hospital is a teaching hospital, used to train doctors. Yes, in teaching hospitals it is common to keep tissue samples of certain cancers and diseases for many years, for use in research and training. It had nothing to do with who she was, but rather the nature of her illness. Even regular hospitals will keep pathology samples for years for routine re-analysis if need be, so yes your tissue samples are still stored most likely in your hospital. Remember, these are not the entire bits removed, but smaller portions, so they don't take up all that much room.