In the sentence ‘PD was associated with postoperative expression of GFAP; ePOCD was associated with postoperative expression of microRNA-21-5p and GFAP as well as intraoperative expression of NSP’ (PMID:34 300 256) [46], the abbreviation ‘PD’ means postoperative delirium and hence the association with the disease PD is incorrect. The gene discussed is GFAP; the disease is Parkinson disease.