MUC22 and cystic fibrosis: An intron2 variant of MUC22 (PBMUCL1), a candidate susceptibility gene for diffuse panbronchiolitis (DPB), was more frequently observed in patients with extensive BL/BE.<h4>Conclusions</h4>This is the first report in Vietnamese patients with non-specific upper and lower airway symptoms to identify genetic variants specific to CF and PCD, as well as another variant potentially associated with DPB.