Quantification of Circulating Vascular Endothelial Growth Factor Receptor-3–Positive Lymphatic/Vascular Endothelial Progenitor Cells

To the Editor: We read with interest the article by Bogos et al. ([1][1]), which showed that circulating lymphatic/vascular endothelial progenitor cells (LVEPC) are significantly increased in small cell lung cancer (SCLC) patients and correlate with clinical behavior. We wish to comment on several