PIR and Alzheimer disease: In the two separate AD datasets, they found 10 overlapping piRNAs with differential expression, including piR-hsa-1282, piR-hsa-23538, piR-hsa-23566, piR-hsa-27400, piR-hsa-27725, piR-hsa-28116, piR-hsa-28189, piR-hsa-28390, piR-hsa-29114, and piR-hsa-7193, suggesting that some piRNAs are consistently dysregulated in AD.