APOA2 and allergic rhinitis: High-density lipoprotein (HDL) isolated from patients with allergic rhinitis shows a significantly reduced content of apolipoprotein A-I (apoA-I) and phosphatidylcholine, while having increased levels of apolipoprotein A-II (apoA-II), lysophosphatidylcholine, and triglycerides, compared to HDL from non-allergic healthy controls [55].