CD8A and hydrops fetalis: The relative cell migration of each lymphocyte subset to malignant pleural fluids was comparable to the increment of each subset in MPEs (increment of LAC cells in fold change compared to HF cells: CD20+ B: 1.51(0.57–2.68); CD8+ T: 1.73(0.9–2.69); CD4+ T: 1.31(0.53–2).