Also, cystatin C, a biomarker commonly used in practice could also predict postsurgery AKI (https://www.ahajournals.org/doi/abs/10.1161/circ.136.suppl_1.21142; https://app.covidence.org/reviews/161933).2, 21, 22, 23, 24, 25. The gene discussed is CST3; the disease is acute kidney injury.