GBA1 and Parkinson disease: We identified ten major areas of research (e.g., clusters) that developed over time, from the oldest (i.e., on <i>glucocerebrosidase protein</i> or <i>molecular analysis of the GBA gene</i>) to the most recent ones (i.e., on <i>drug resistance in cancer, pharmacological chaperones</i>, or <i>Parkinson's disease</i>).