CD4 and systemic lupus erythematosus: Since the accelerated apoptotic pulmonary parenchymal cells in SLE-associated DAH include immune effectors like T cells and monocytes [1,3,15,16], we further examined CD4+ and CD14+ MNC subpopulations for the expression of lincRNA-p21, HOTAIR and H19 from SLE-associated DAH patients and HC subjects.