GPA33 and idiopathic pulmonary fibrosis: Specifically, using GTEx eQTL data, our SMR analysis determined two genes with potential causal associations with IPF, including GPA33 (PSMR = 0.0013; PHEIDI = 0.0741) and MICA (PSMR = 0.0112; PHEIDI = 0.9712).