Based on limited published evidence, GRAPL is a GRB2-related adaptor protein that functions as a signaling adaptor with receptor tyrosine kinase binding capacity. It localizes to the cytoplasm and participates in enzyme-linked receptor protein signaling and cell migration through protein-binding interactions. GRAPL has been identified as part of immune-related gene signatures associated with lung squamous cell carcinoma prognosis 1 and as a candidate biomarker predictive of therapeutic response to Tripterysium glycosides in rheumatoid arthritis patients 2. However, detailed molecular mechanisms and specific biological functions remain largely uncharacterized.