We highly appreciated the publication of the article by Lotte Hatt and coauthors in your journal (Hatt L, et al. Characterization of Fetal Cells from the Maternal Circulation by Microarray Gene Expression Analysis - Could the Extravillous Trophoblasts Be a Target for Future Cell-Based Non-Invasive Prenatal Diagnosis? Fetal Diagn Ther 2014; 35:218-227).